The ac Stark shift of the resonance frequency of the nonlinear magneto-optic effect (NMOE) results in a fundamental broadening of this resonance which limits the precision of optical magnetometry based on NMOE. We have studied the dependence of the ac Stark shift versus ...

We describe an analysis and experimental results of the manipulation of motional states of a single trapped 40Ca+ ion based on sideband excitation by rapid adiabatic passage. When the sideband transition is excited by rapid adiabatic passage, adiabaticity may be affected by ac Stark shifts. We investigate the influence of ...

... absorption, the ac Stark effect (shift and the broadening of the level due to the field interaction), and the parameters in nonlinear opt i';, .ich as the ...

We report on an experimental and theoretical study of thedynamic (ac) Stark effect on a for bidden transition. A general frameworkfor parameterizing and describing off-resonant ac-Stark shifts ispresented. A model is developed to calculate spectral line shapesresulting from resonant excitation of atoms in an ...

The ac Stark effect is a well-known, well-established effect associated with the displacement of the atomic energy levels in the presence of an electromagnetic (e.m.) field. As the origin of the e.m. field is irrelevant, a self-induced ac Stark effect should be present in a laser. However, not only has this effect ...

We demonstrate the cancellation of the differential ac Stark shift of the microwave hyperfine clock transition in trapped {sup 87}Rb atoms. Recent progress in metrology exploits so-called magic wavelengths, whereby an atomic ensemble can be trapped with laser light whose wavelength is chosen so that both levels of an optical atomic ...

The influence of ac Stark shifts on the three-photon ionization of cesium in a moderate-intensity laser beam is investigated. The ionization process involves a two-photon resonance with the 8d fine-structure levels. The work consists of two related parts. In the first part, atomic parameters, such as the two-photon Rabi rate and the ...

We report photoionization measurements that help us interpret mechanisms leading to the control of the branching ratio for resonantly enhanced, two-color, two-photon ionization experiments. We measure intermediate state populations and photoelectron angular distributions to explore the ionization dynamics. Our measurements support the interpretation that ac ...

Multiphoton excitation in a two-level system is exceedingly weak because of small multiphoton coupling strengths, large ac Stark shifts, and ionization. I will discuss a three-level system in which the ac Stark shift is greatly reduced and the multiphoton coupling strength ...

By setting laser beams in two-photon Doppler-free configurations for both cascade and ?-type subsystems in a four-level inverted-Y system, a four-wave mixing (FWM) process is studied and optimized within the Doppler profile. The two-photon ac-Stark effect in the FWM signal is observed, which can be used to determine the energy level shift of the atom due ...

We propose a method to decelerate polar molecules from a beam using a microwave field. A moving standing wave of a microwave electric field causes an ac Stark shift to polar molecules and decelerates them. The method is applicable to polar molecules in rotational ground states and can be used to directly load a microwave trap. ...

We propose a method to decelerate polar molecules from a beam using a microwave field. A moving standing wave of a microwave electric field causes an ac Stark shift to polar molecules and decelerates them. The method is applicable to polar molecules in rotational ground states and can be used to directly load a microwave trap. ...

Improved atomic beam deflection and improved isotope separation, even in vapors, is proposed by substituting the A.C. Stark effect for the baseband chirp of the pushing beam in the prior proposal by I. Nebenzahl et al., Applied Physics Letters, Vol. 25, page 327 (September 1974). The efficiency inherent in re-using the photons as in the Nebenzahl et al ...

The blackbody radiation shift, a manifestation of the Stark effect caused by blackbody radiation, contributes to the systematic uncertainty in Cs-based frequency standards at a level of 1 x 10(-15). Few measurements of the third-order scalar electric polarizability of the Cs ground states, mainly responsible for the ac ...

Nonlinear magneto-optical rotation (NMOR) is investigated at highlight powers where the rotation is significantly modified by AC Stark shifts. These shifts are shown to change the overall sign of rotation for closed F-->F+1 transitions as light power is increased. The effect is demonstrated by measurements in ...

The ``electromagnetic (e.m.) mirror'' for neutral atoms is based on the principle that, for near resonant blue shifted frequency, the a.c. Stark shift of an evanescent wave acts as an inhomogeneous potential repelling the atoms. We investigate the reflection of neon metastable atoms by a surface plasmon wave at the ...

The direct interaction of superintense laser fields in the optical frequency domain with nuclei is studied. As main observable, we consider the nuclear dynamic (AC) Stark shift of low-lying nuclear states due to the off-resonant excitation by the laser field. We include the case of accelerated nuclei to be able to control the frequency ...

An experimental scheme to simulate the Blackbody radiation (BBR) frequency shift with carbon dioxide (CO2) laser in cesium fountain frequency standard is proposed. The alternative (ac) electric field from a CO2 laser with 10.6 microm wavelength causes the similar ac Stark shift of the clock ...

science 5 . For precision spectroscopy, a frequency comb laser generally acts as a phase-coherent link on the excitation of atomic transitions with phase-locked pulse sequences 7�11 may provide a solution. No cw laser.g., Doppler shift and ac Stark shift , the amplifier phase shift error 6 25 ...

The evolution of the field entropy in the two-photon JCM in the presence of the Stark shift is investigated, and the effects of the dynamic Stark shift on the evolution of the field entropy and entanglement between the atom and field, are examined. The re...

We study the dependence of the ac Stark shifts of electronic energies on the molecular orientation relative to the polarization direction of an incident intense laser field, using a three-dimensional non-Hermitian Floquet method and H2+ as a model system. Simultaneously, we also study the orientation-dependent high-order harmonic ...

Anomalous photoelectron angular distributions are observed at certain wavelengths in strong-field ionization of H2. We relate this feature to ac Stark shifts from bound-bound transitions in the Rydberg manifold of principal quantum number n=3 and 4. A model of the multistate interaction supports this interpretation.

We argue that ultracold atoms in strongly shaken optical lattices can be subjected to conditions similar to those experienced by electrons in laser-irradiated crystalline solids, but without introducing secondary polarization effects. As a consequence, one can induce nonperturbative multiphoton-like resonances due to the mutual penetration of ac-Stark-shifted Bloch bands. ...

Faraday rotation based on ac Stark shifts is a mechanism that can entangle the polarization states of photons and atoms. We study the entanglement dynamics inside an optical cavity, and characterize the photon-atom entanglement by using the Schmidt decomposition method. The time dependence of entanglement entropy and the effective ...

and passive slow-light experiments reveal large ac Stark shifts, power broadening, and transit-time broadening be pressurized and can be evacuated [38]. Furthermore, significant linewidth broadening of the hot va- pors broadening mechanism. This effect is inherently connected to transit-time broadening in such systems

... Title : Experimental Stark Widths and Shifts for Spectral Lines of Neutral Atoms (A Critical Review of Selected Data for the Period 1976 to 1982),. ...

... Title : Experimental Stark Widths and Shifts for Spectral Lines of Positive Ions (A Critical Review and Tabulation of Selected Data for the Period ...

... Title : Experimental Stark Widths and Shifts for Non-Hydrogenic Spectral Lines of Ionized Atoms (A Critical Review and Tabulation of Selected Data ...

We present an investigation of the effects of constant but random shifts of the ground hyperfine qubit states in the setting of quantum computing with ion doped crystals. Complex hyperbolic secant pulses can be used to transfer ions reliably to electronically excited states, and a perturbative approach is used to analyze the effect of ground-state hyperfine ...

One of the dominant systematic effects that shift resonance lines in high-precision measurements of two-photon transitions is the dynamic (ac) Stark shift. For suitable laser frequencies, the ac Stark shift acquires an imaginary part which corresponds ...

The burgeoning fields of quantum computing and quantum key distribution have created a demand for a quantum memory. The gradient echo memory scheme is a quantum memory candidate for light storage that can boast efficiencies approaching unity, as well as the flexibility to work with either two- or three-level atoms. The key to this scheme is the frequency gradient that is placed across the memory. ...

The burgeoning fields of quantum computing and quantum key distribution have created a demand for a quantum memory. The gradient echo memory scheme is a quantum memory candidate for light storage that can boast efficiencies approaching unity, as well as the flexibility to work with either two- or three-level atoms. The key to this scheme is the frequency gradient that is placed across the memory. ...

We investigate the near infrared interband absorption of semiconductor quantum wells driven by intense terahertz (THz) radiation in the regime of ultrastrong coupling, where the Rabi frequency is a significant fraction of the frequency of the strongly driven transition. With the driving frequency tuned just below the lowest frequency transition between valence subbands, a particularly interesting ...

We present experimental results that show a significant yield of nP atoms after excitation of nS Rb Rydberg atoms from a MOT using a pulsed dye laser, where 27<=n<=39. Such results are naturally attributed to binary collisions. This cannot be the case here, because the interaction between Rb nS atoms is repulsive. In this experiment, the AC-Stark effect, dipole- dipole ...

The precise measurement of transition frequencies of trapped atomic samples is susceptible to inaccuracy arising from the inhomogeneous differential shift of the relevant energy levels in the presence of the trapping fields. We demonstrate near-complete cancellation of the differential ac Stark shift ("light ...

Recent experiments demonstrating atomic quantum memory for light [B. Julsgaard et al., Nature 432, 482 (2004)] involve two macroscopic samples of atoms, each with opposite spin polarization. It is shown here that a single atomic cell is enough for the memory function if the atoms are optically pumped with suitable linearly polarized light, and quadratic Zeeman shift and/or ...

We have performed spectroscopic measurements of a superconducting qubit dispersively coupled to a nonlinear resonator driven by a pump microwave field. Measurements of the qubit frequency shift provide a sensitive probe of the intracavity field, yielding a precise characterization of the resonator nonlinearity. The qubit linewidth has a complex dependence on the pump frequency ...

Coupling a superconducting qubit to a superconducting resonator enables to investigate the interaction between light and matter with a unique flexibility of design, and allows to reach coupling regimes hardly accessible otherwise [Wallraff Nature 2004]. In this talk, we discuss the ac-Stark shift and the measurement induced dephasing of a qubit embedded in ...

The {sup 2}S{sub 1/2}(F=0){yields}{sup 2}F{sub 7/2}(F=3,m{sub F}=0) transition at 467 nm in a single trapped, laser-cooled ion of {sup 171}Yb{sup +} has been measured to be f{sub Yb{sup +}}=642 121 496 771.26(23) kHz using a femtosecond laser frequency comb generator. The measurement is limited by measurement statistics and by the ac Stark ...

We have measured the ac Stark shift of the 4s{sup 2} {sup 1}S{sub 0}-4s4p {sup 3}P{sub 1} line in {sup 40}Ca for perturbing laser wavelengths between 780 nm and 1064 nm with a time domain Ramsey-Borde atom interferometer. We found a zero crossing of the shift for the m{sub S}=0-m{sub P}=0 transition and {sigma} ...

We study dynamics of Rabi oscillation under a periodic pulsed perturbation. We study how the resonance frequency of a cesium ground hyperfine transition between sublevels with nonzero magnetic quantum number is affected by periodically applied magnetic pulses. When the pulse height and pulse duration are set such that a fictitious spin completes a 2? or its integer multiple precession around the ...

Numerical ab initio variational calculations of the transition probabilities and ac Stark shifts in two-photon transitions of antiprotonic helium atoms driven by two counter-propagating laser beams are presented. We found that sub-Doppler spectroscopy is, in principle, possible by exciting transitions of the type (n,L)?(n-2,L-2) ...

We investigate the entanglement dynamics of two two-level atoms interacting with two vacuum fields of two spatially separated cavities with the Stark effects by employing the concurrence. It is shown that the entanglement sudden death (ESD) and birth (ESB) could be controlled by adjusting the Stark-shift parameters. If the Stark-shift ...

Compared to single-photon rates, multiphoton excitation rates of atoms and molecules are generally quite small. Small multiphoton coupling strengths, large ac Stark shifts and ionization all inhibit real population transfer between bound states. However, it has recently been shown that a 3-level system consisting of a ground state and ...

We propose a compact atomic clock that uses all-optical interrogation of ultra-cold Rb atoms that are magnetically trapped near the surface of an atom microchip. The interrogation scheme, which combines electromagnetically induced transparency with Ramsey's method of separated oscillatory fields, can achieve an atomic shot-noise-level performance better than 10^{-13}/sqrt{tau} for 106 atoms. A ...

By using spontaneous Raman processes in the high-gain regime, we create instantaneous coherence between two independent atomic ensembles. The coherence is confirmed by the observation of temporal beating between the two subsequent readout fields converted from the atomic excitations through another enhanced Raman process. The beat frequency is found to be a result of an AC ...

We propose a method to control population transfer and coherence in a multimode system using a transform-limited pump and a linearly chirped Stokes pulse in stimulated Raman scattering. Simultaneously applied pump and Stokes pulse are shown to induce the ac Stark shifts that result in nonadiabatic coupling of the dressed states, ...

A theoretical framework for describing high intensity multilevel rotational Raman scattering is presented. The formalism, which employs the multipole form of the density matrix equations, is valid at low as well as high intensities, in transient and steady state regimes and, allows for coupling of arbitrary polarizations of the various Stokes/anti-Stokes fields. Several examples are discussed to ...

This paper describes a theoretical investigation of the effect of near-resonant amplitude-modulated optical field on the parametric resonances and quasi-level structure of an atom. Analytical solutions derived for the density-matrix equations of motion for the case of two-level and three-level atoms are used for analysis of the quasi-level shifts. Mathematical models are ...

We demonstrate single-qubit operations on a trapped atom hyperfine qubit using a single ultrafast pulse from a mode-locked laser. We shape the pulse from the laser and perform a ? rotation of the qubit in less than 50 ps with a population transfer exceeding 99% and negligible effects from spontaneous emission or ac Stark shifts. The ...

The aim of this work is to find ways to trap an atom in a cavity. In contrast to other approaches, we propose a method where the cavity is basically in the vacuum state and the atom is in the ground state. The idea is to induce a spatial dependent ac-Stark shift by irradiating the atom with a weak laser field, so that the atom experiences a trapping force. ...

The dc field Stark effect is studied theoretically for atoms in high intensity laser fields. We prove that the first-order perturbation corrections for the energy and photoionization rate vanish when the dc field strength serves as a perturbational strength parameter. Our calculations show that by applying a dc field in the same direction as the polarization direction of the ...

The magnetic field in the microwave interaction zone of the fountain atomic clock was measured by stimulated Raman transitions. By measuring the two-photon transition frequency between the Zeeman levels of the two ground states, we achieved a magnetic field measurement accuracy of the order of 0.28 nT. This method is immune to the Doppler shift and the AC ...

We have measured light shifts, also known as AC Stark shifts, as a function of laser intensity in cold Rubidium atoms by observing sub-natural linewidth gain and loss features in the transmission spectrum of a weak probe beam passing through the atomic sample. The observed energy-level shifts ...

The stimulated radiative corrections (or ac-Stark shift, or light shift . . .) of the energy levels of a hydrogenic atom irradiated by an intense, nonresonant, monomode laser field, are evaluated within the framework of the time-dependent perturbation theory, up to and including fourth order. The calculation is performed by using a ...

The influence of saturation and Stark shifting on the collisionless coherent anti-Stokes Raman scattering (CARS) spectra of Q-branch vibrational transitions has been studied theoretically and experimentally. These processes can significantly affect the ma...

In this work we report new Stark shift data of several lines from UV region (246 nm - 300 nm) of doubly ionized krypton spectrum. A low-pressure arc with mixture of 8% krypton and 92% helium was used as a plasma source.

Stark broadening and shift parameters for resonance lines of sodium and potasium emitted by an electromagnetic T tube plasma were found to be in good agreement with theoretical data of Griem in a large range of temperature (15000 K - 26000 K).

Standard perturbation results are applied to the case of laser induced dynamic Stark shifts of vibration-rotation terms of diatomic molecules. For fields at frequencies near an allowed vibration-rotation transition there are just four terms coupled by all...

In this work, we study the role of the ac Stark effects on the excitation of nS{sub 1/2} cold Rydberg atoms produced in a rubidium magneto-optical trap. We have observed an atomic population in the nP{sub 3/2} state after excitation of nS{sub 1/2} for 29{<=}n{<=}37. Such an observation is normally attributed to binary collisions; however, the ...

The influence of the dynamical Stark shift on the thermal entanglement and the efficiency of the quantum Otto cycle is studied for the su(1,1) Tavis�Cummings system. It is shown that the degree of the thermal entanglement becomes larger as the dynamical Stark shift increases. In contrast, the efficiency of the ...

... Abstract : A hot plasma composed of helium and ionized nitrogen was created by reflecting the shock wave produced in an electromagnetic T-tube. ...

We demonstrate large cavity-enhanced optical Stark shifts for a single quantum dot (QD) coupled to a photonic crystal cavity. A maximum Stark shift of 20 GHz is observed for a QD detuned by 104 GHz from the cavity mode. These Stark shifts are attained with extremely low ...

... of broadening of spectral lines by the statistical ionic field the higher terms of the Stark effect shift for the first hydrogen Balmer lines are calcu ated. ...

... Chemical changes are shown to ... MONOXIDE, BONDING, CHEMICALS, CLUSTERING, COORDINATES ... POTENTIAL ENERGY, SHIFTING, STARK ...

The strong-field dissociation behavior of diatomic molecules is examined under two distinctive physical scenarios. In the first scenario, the dissociation of the isolated hydrogen and deuterium molecular ions is discussed. The dynamics of above-threshold dissociation (ATD) are investigated over a wide range of green and infrared intensities and compared to a dressed-state model. The second ...

The strong-field dissociation behavior of diatomic molecules is examined under two distinctive physical scenarios. In the first scenario, the dissociation of the isolated hydrogen and deuterium molecular ions is discussed. The dynamics of above-threshold dissociation (ATD) are investigated over a wide range of green and infrared intensities and compared to a dressed-state model. The second ...

We study the low temperature physics of an ultracold atomic gas in the potential formed inside a pumped optical resonator. Here, the height of the cavity potential, and hence the quantum state of the gas, depends not only on the pump parameters, but also on the atomic density through a dynamical ac-Stark shift of the cavity resonance. We derive the ...

We study the low temperature physics of an ultracold atomic gas in the potential formed inside a pumped optical resonator. Here, the height of the cavity potential, and hence the quantum state of the gas, depends not only on the pump parameters, but also on the atomic density through a dynamical ac-Stark shift of the cavity resonance. We derive the ...

We present photoelectron spectra (PES) of xenon subject to ultrashort intense laser pulses at 400 nm. The intensity-dependent PES exhibit the dominance of ac-Stark-shifted multiphoton resonances in a multiphoton ionization process. A distinct difference in the spectra with different laser polarization states (i.e., linearly and circularly polarized states) is revealed and can ...

A method for calculating the Stark broadening and shift of the spectral lines was developed based on a combination of the ion plasma model and new theoretical and computational methods for taking the Stark effect into account. Theoretical results are compared with experimental data on the broadening and shift of ...

The dependence of line halfwidth on plasma inhomogeneity and Stark broadening and shift parameters has been investigated by the numerical simulation. It is shown that the increasing of the ratio of Stark shift parameter to Stark width one lowers the inhomogeneity influence on the line profile. ...

The response of a hydrogen atom to a perturbative electric field is presented from a classical viewpoint. We find {ital classical energy shifts} in the hydrogen atom in situations that correspond to both the linear and quadratic Stark effects. We then compare these energy shifts to the exact quantum-mechanical values for the ...

Selection of state-insensitive or �magic� trapping conditions with ultracold atoms or molecules, where pairs of internal states experience identical trapping potentials, brings substantial benefits to precision measurements and quantum computing schemes. Working at such conditions could ensure that the detrimental effects of inevitable inhomogeneities across an ultracold sample are ...

We study the dependence of the AC Stark shifts of electronic energies on the molecular orientation relative to the polarization direction of an incident intense laser field, using a three dimensional non-Hermitian Floquet method and H2^+ as a model system ^[1]. Simultaneously, we also study the orientation dependent high harmonic ...

We report on the hyperfine-structure measurements of the 5P1/2 and 5P3/2 states as well as the isotope shift of the D1 transition of radioactive 82Rb (t1/2=75 s) atoms trapped in a magneto-optical trap. The systematic effects of light shift (ac Stark shift) and power broadening were explored to ...

We have measured the spectral properties of the fourth anti-Stokes component of the output of a pressurized, molecular hydrogen, Raman shifter pumped by the intense output of a frequency-doubled narrowband pulsed dye laser. All the observed line shapes are asymmetric, with full widths at half-maximum ranging from 0.3 to 0.8 cm/sup -1/. The spectral peak of the Raman-shifted ...

We have directly monitored the rf Stark-field-induced splitting of the gain profile of the 1222-..mu..m /sup 13/CH/sub 3/F optically pumped far-infrared (OPFIR) laser transition. The resulting data are found to be in good agreement with ac Stark theory. Comparison with dc Stark tuning techniques shows that the rf ...

The authors directly monitored the rf Stark-field-induced splitting of the gain profile of the 1222 micrometer /sup 13/CH/sub 3/F optically pumped far-infrared (OPFIR) laser transition. The resulting data are found to be in good agreement with ac Stark theory. Comparisons with dc Stark tuning techniques shows that ...

We study theoretically the problem of a hydrogen atom exposed both to a static dc field and to a monochromatic ac field. We show that, in the presence of an ac field, a constructive (or destructive) interference occurs between the excited (Rydberg) Stark resonance states and the hydrogenic ground state. This mechanism is responsible ...

Stark width and shift simultaneous dependence on the upper level ionization potential and rest core charge of the emitter has been evaluated and discussed. It has been verified that the found relations, connecting Stark broadening parameters with upper level ionization potential and rest core charge of the emitters for particular ...

Quantum information processing with trapped ions has traditionally involved state preparation, manipulation (eg. quantum gates) and detection using CW lasers. Quantum gates implemented with ions typically involve optical Raman transitions between two atomic levels. An optical frequency comb, emitted by a pulsed laser, is an excellent tool for bridging atomic frequency differences. Previously, we ...

The Stark shifts and widths for highly excited states, n=15-30, of hydrogen atom in strong electric field E are calculated (the E values exceed the classical ionization threshold E of the atom). The calculation method is summation of divergent perturbatio...

Stark broadening parameters for spectral lines from neutral and singly ionized atoms broadened and shifted by the local fields of both electrons and ions in a plasma are calculated in the classical path approximation. The electron collisions are treated b...

The optical Stark effect is a well-known phenomenon in atomic systems where an atomic transition shifts by application of an off-resonance light beam. The effect persists for the duration of the optical pulse has been explained using the 'dressed atom' pi...

This annual report describes research on two-photon pumping of molecular lasers operating on hot band transitions of the molecules and the associated nonlinear effects (Raman and hyper-Raman) that contribute to the gain spectrum of the molecular system. Accessing the hot bands of a molecule results in more lasing transitions that would otherwise be observed, and modifies the characteristics of the ...

We report local and fast flux tuning of Transmon qubits in circuit QED by means of proximal short-circuited coplanar waveguides. We characterize the effect of these additional microwave channels on qubit lifetime. We demonstrate one-qubit Z-gates and time-domain control of two-qubit interaction via virtual photon exchange. Gate performance is characterized by process tomography and compared to ...

It has been observed that fairly accurate estimates for two-photon bound-bound amplitudes in hydrogen can be obtained from a simple partial summation restricted to the discrete spectrum contribution, provided one uses the {bold E}{center dot}{bold r} form of the interaction Hamiltonian. We show that this conclusion does not hold when considering higher-order multiphoton processes. In fact, the ...

Standard perturbation results are applied to the case of laser induced dynamic Stark shifts of vibration-rotation terms of diatomic molecules. For fields at frequencies near an allowed vibration-rotation transition there are just four terms coupled by allowed transitions which cause significant shifts. After discussion of the method of ...

The dynamic Stark effect is the quasistatic shift in energy levels due to the application of optical fields. The effect is in many ways similar to the static Stark effect. However, the dynamic Stark effect can be applied on rapid time scales and with high energies, comparable to those of atoms and molecules ...

By means of EPR spectroscopy of LiNbO3?Fe at room temperature (RT) it is shown that the Stark effect in ferroelectric crystals can be different from that observed in other materials. Novel properties appear when an external E field reverses the direction of the spontaneous polarization, the direction of the linear Stark shift stays the ...

Compared to single-photon rates, multiphoton excitation rates of atoms and molecules are generally quite small, even at high laser intensities, at least in a 2-level system. Small multiphoton coupling strengths, large ac Stark shifts, and ionization all inhibit real population transfer between bound states. However, it has recently ...

Compared to single-photon rates, multiphoton excitation rates of atoms and molecules are generally quite small, even at high laser intensities, at least in a 2-level system. Small multiphoton coupling strengths, large ac Stark shifts, and ionization all inhibit real population transfer between bound states. However, it has recently ...

Implementation of single-qubit and two-qubit quantum gates in a long linear chain of trapped ions generally requires the manipulation of qubits stored in individual ions using a set of laser beams. Individual addressing has been demonstrated with acousto-optic and electro-optic deflectors, by using the Zeeman shift due to a magnetic field gradient, and by separating the ions. ...

Three-photon ionization spectra of Ba were studied which result from two-photon resonances between the 6s/sup 2/ /sup 1/S/sub 0/ ground state and the 6snd J = 2,6s(n + 1)s /sup 1/S/sub 0/ (16< or =n<40) Rydberg states and 5d7d /sup 1/D/sub 2/, /sup 3/P/sub 0,2/ perturber states. A tunable laser with field strength 10/sup -//sup(/sup 4 -5/) a.u. was used to drive the excitation in a ...

Stark widths and shifts of Ar II 472.68 nm spectral line were measured from T-tube plasmas. Plasma electron density ranged 1.8-2.210{sup 17} cm{sup -3}, while temperature ranged 20000-43000 K. Obtained results of widths and shifts were compared with measured results of other authors.

... longitudinal and transverse diffraction, non-resonant non-linearities, local field effects, Stark shifts, (3) numerical studies of the transverse behavior ...

... action of the long range Coulomb fields of many particles. Only the low frequency part of this composed field leads to adiabatic energy shifts. ...

... Abstract : In a parabolic quantum well, the shift in the optical transition energy due to the quantum confined Stark effect is independent of the carrier ...

... Abstract : Conventional self-electrooptic effect device (SEED) is based on the so-called quantum-confined Stark effect (QCSE), which results in the ...

... shift due to the Quantum Confined Stark effect (QCSE) in such non-square QW structures. The effect of these changes is to ...

... For a many-electron atom the quadratic Stark effect produces a shift proportional to 1/R to the fourth power where R is the distance perturber-atom. ...

... The amount of shift observed was 0.21 meV/KVcm-1 which is due to linear Stark effect associated with the step quantum well. ...

The time evolution of the linear entropy of an atom in k-photon Jaynes-Cummings model is investigated taking into consideration Stark shift and Kerr-like medium. The effect of both the Stark shift and Kerr-like medium on the linear entropy is analyzed using a numerical technique for the field initially in coherent ...

... capabilities across the military departments and agencies for Research Development Test ... Over 200 papers compiled by the NBS Data Center on ...

It is shown that the resonant enhancements of the optical Kerr effect and the optical Stark effect of the same order are caused by the same change in the state of an atomic system. The analysis of the known experimental data demonstrates the identity of their influence on nonlinear optical processes. It is shown that a separate analysis of the influence of ...

The emission frequency of an amplified spontaneous emission (ASE), optically pumped submillimeter (SMM) laser has been studied as a function of laser gas pressure for several different gases and SMM laser lines. For off resonant pumping, Fabry--Perot interferometer scans indicate a shift in emission frequency between high- and low-pressure laser operation. In high-pressure ...

Laser-induced optical potentials for atoms have led to remarkable advances in precision measurement, quantum information and towards addressing fundamental questions in condensed-matter physics. Here, we describe analogous optical potentials for electrons in quantum wells and wires that can be generated by optically driving the transition between a single electron and a three-body electron-exciton ...

Manipulation of electron dynamics calls for electromagnetic forces that can be confined to and controlled over sub-femtosecond (fs) time intervals. Tailored transients of light fields can provide these forces. We report on the generation of sub-cycle field transients spanning the infrared, visible, and ultraviolet frequency regimes with a 1.5-octave three-channel optical field synthesizer and ...

The theory of transient stimulated Raman scattering is developed for a molecule with nondegenerate initial and final states. The general coupled Maxwell-Bloch equations describing this case are presented for an arbitrary number of Stokes and anti-Stokes fields, including effects of ac Stark shift, transient refractivity, saturation, ...

The idea of coupling a superconducting qubit to a one-dimensional transmission line resonator, termed circuit QED [1], has evolved into an important paradigm in the ongoing pursuit of quantum computing. Recent experiments using Cooper pair boxes (CPBs) have revealed impressive results ranging from the realization of the strong-coupling limit [2] to the observation of the ac ...

In this work we characterize a state-insensitive dipole trap for cold cesium atoms, as realized by tightly focusing a single running laser beam at the magic wavelength. The use of trapping light at the magic wavelength of 935.6 nm resulted in the same ac Stark shift for the {sup 6}S{sub 1/2} ground state and the {sup 6}P{sub 3/2} ...

In recent years, much attention has been drawn to atomic processes influenced by the screened Coulomb/Yukawa potential. In this work, the influence of the static electric field on screened Coulomb potential is investigated using the complex-coordinate rotation method in Lagrange-mesh calculations. The Stark shifts and half-widths of the ground and excited ...

The pressure dependence of the ac Stark effect for the two-photon A/sup 2/..sigma../sup +/, v' = 0left-arrowX /sup 2/Pi, v'' = 0 transition in NO is studied by using laser-induced fluorescence. Contrary to earlier results obtained by using multiphoton-ionization detection for the same transition (Demaray et al., J. Chem. Phys. ...

We present new measurements of broadening and shift parameters for 5 NI multiplets from the infrared region of the spectrum. The selected spectra have been excited in a wall-stabilized high-current arc operated in a helium-nitrogen mixture with traces of hydrogen for diagnostic purposes. Primary Stark broadening parameters -- the Stark ...

Solvent shifts of the energies of the lowest exp 1 L/sub a/ bands of the electronic absorption spectra of anthracene, chrysene, phenanthrene, and tetracene and of the lowest exp 1 L/sub b/ bands of the electronic absorption spectra of naphthalene, phenant...

Using a semiclassical approach, the electron-, proton-, and ionized helium-impact line widths and shifts for 30 Be II multiplets are calculated. In addition to electron-impact full halfwidths and shifts, Stark-broadening parameters due to proton- and ionized-helium impacts are calculated. The resulting data is compared with existing ...

S>Polarization patterns for Stark-shifted lines under the influence of a distributed electric field are derived for the case of unequal source strengths for pi and sigma polarized emission in order to understand the unexpected experimental results of the AFCRL group. Expressions are obtained for the elements of the density matrix as functions of the direction of ...

Stark shifts of five doubly ionized argon (Ar III) spectral lines have been measured in 3d-4p and 3d-4p transitions in a mixture of Ar (72%) and He (28%) plasma created in the linear, low pressure, pulsed arc discharge at about 30150K electron temperature and 1.47�1023m3 electron density. They are the first published data in this field.

The theories of the dilatation, r ..-->.. re/sup i theta/, and translation, x ..-->.. x + iq, transformations as related to the Stark problem are reviewed, and new results obtained. Results for the hydrogen atom n = 1 and n = 2 levels and the /sup 1/P/sup 0/, 2s2p H/sup -/ shape resonance in dc fields are presented, and the extension to the ac ...

The ERP lineshifts occurring in ruby when stressed with DC, modulated DC and AC fields are described. It is shown that the space charge effects which might influence the DC results can be overcome by modulating the stressing voltage. The lineshift sensiti...

Some experimental results of the application of small electric fields on an optically pumped metal-dielectric far infrared (FIR) waveguide laser are shown. It is demonstrated that sizable modulation of the FIR output power can be obtained with ac fields.

... It is also important for estimating the line shape functions at low-carrier densities. ... the ac-Stark effect under low real-excited carrier density conditions ...

High resolution, quasi-cw, stimulated Raman-gain spectroscopy has become a standard technique for the study of molecular energy levels. In this paper we apply this technique to the study of two diverse problems: a determination of the ac Stark effect for ...

Nonlinear electron dynamics in semiconductor quantum structures define a rich scientific arena with potential impact on novel devices in the terahertz regime. An important concept is photon assisted transport marked by new transport channels, opened by th...

This patent describes a two-phase AC power supply. It comprises AC systems; connectors; electric currents; and phase shift.

We report measured Stark shifts and widths of the neutral carbon 5052- and 4932-� lines and the neutral oxygen 4368-� line in the plasma of an atmospheric pressure wall stabilized electric arc. Electron densities of (1.4-3.1)�1016 cm-3 are measured from the width of the H? line while electron and gas temperatures in the range from 9300 to 10 300 K ...

This thesis describes the development and implementation of a new scheme for observing RF transitions between spin states in a single, trapped Ba + ion. We use optical pumping to place the ion in a selected magnetic sublevel of either the 6S1/2 ground state or the 5D3/2 metastable state. The ion is exposed to an RF field, and a spin-sensitive version of the electron shelving method detects the ...

We report on the hyperfine-structure measurements of the 5P{sub 1/2} and 5P{sub 3/2} states as well as the isotope shift of the D{sub 1} transition of radioactive {sup 82}Rb (t{sub 1/2}=75 s) atoms trapped in a magneto-optical trap. The systematic effects of light shift (ac Stark shift) and ...

We investigate a singly charged quantum dot under a strong optical driving field by probing the system with a weak optical field. We observe all critical features predicted by Mollow for a strongly driven two-level atomic system in this solid state nanostructure, such as absorption, the ac-Stark effect, and optical gain. Our results demonstrate that even at high optical field ...

When pumping near the two-photon 3d resonance in pure sodium vapor and observing the backward hyper-Raman emission to the 3p substates, an asymmetry in ratios of 3p/sub 1/2/, 3p/sub 3/2/ associated emissions was observed dependent upon the direction of the initial laser detuning from the resonance. It has been determined that this asymmetry can be attributed to the ac ...

Using a Sturmian function expansion we have computed the nth order coefficients E/sub n/(..omega..), for 2less than or equal toless than or equal to2, in the perturbation expansion of the ac Stark effect in the hydrogen 1s state. An ''effective convergence'' similar to that in the dc case is observed. A parametrization ...

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We present the first implementation of transient vibrational Stark-effect spectroscopy as an ultrafast probe of solvation dynamics. The method is applied to the phototriggered intramolecular charge-transfer reaction of Betaine-30, where the vibrational Stark shifts of the nearby solvent molecules--arising from the change in the ...

We examine the Stark effect (the second-order shifts in the energy spectrum due to an external constant force) for two one-dimensional model quantum mechanical systems described by linear potentials, the so-called quantum bouncer (defined by V(z) = Fz for z > 0 and V(z) = ? for z < 0) and the symmetric linear potential (given by V(z) = F|z|). We show ...

By means of EPR spectroscopy of LiNbO(3):Fe at room temperature (RT) it is shown that the Stark effect in ferroelectric crystals can be different from that observed in other materials. Novel properties appear when an external E field reverses the direction of the spontaneous polarization, the direction of the linear Stark shift stays ...

The emission spectrum of the 3?i-3?i (0-0) AlN band and some N+ and N emission lines have been studied in the visible region for the laser ablated plumes. The Stark-shift and Stark broadening were observed. The component species in the ablated plumes were analyzed by time of flight mass spectroscopy. The electron density and the temperature were calculated ...

We have studied the Stark effect for Rydberg p states of noble gas atoms using laser optogalvanic spectroscopy. The measurements were performed in the sheath region of noble gas glow discharges. Laser excitation from metastable states to np states was monitored by optogalvanic spectroscopy. Clear Stark shifts were observed and the ...

Stark spectroscopy is the effect of an electric field on a spectrum. Measurements of the Stark effect give information on the change in dipole moment and polarizability for a spectroscopic transition. The great majority of Stark effect measurements have been and still are made in the gas phase where spectroscopic transitions are very ...

A symmetrical atom interferometer with a thermal calcium atom beam has been developed using a narrow linewidth diode laser stabilized to the resonance of a high-finesse cavity. The linewidth of the diode laser was estimated to be less than 1 Hz relative to the cavity resonance in noise measurement over the range of 100 Hz to 1 MHz, and the phase instability of the interference fringes obtained ...

Recent demonstrations of light-matter interactions with atoms and molecules confined to hollow waveguides offer great promise for ultralow-light-level applications. The use of waveguides allows for tight optical confinement over interaction lengths much greater than what could be achieved in bulk geometries. However, the combination of strong atom-photon interactions and nonuniformity of guided ...

Recent demonstrations of light-matter interactions with atoms and molecules confined to hollow waveguides offer great promise for ultralow-light-level applications. The use of waveguides allows for tight optical confinement over interaction lengths much greater than what could be achieved in bulk geometries. However, the combination of strong atom-photon interactions and nonuniformity of guided ...

Abstract. We review the quantum transport of ultra-cold alkali atoms trapped in a one-dimensional optical lattice of double-potential wells, engineered through a combination of ac-Stark shifts and Zeeman interactions. The system is modelled numerically through analysis of the bandstructure and integration of the time-dependent Schr�dinger equation. By ...

Laboratory techniques to manipulate and observe ultracold atoms make these an attractive platform for testing new ideas in quantum control and measurement. I will discuss recent experiments in which we use tensor AC Stark shifts and magnetic fields to drive non-trivial quantum dynamics of a large spin-angular momentum associated with ...

The circular polarized laser beam of the 'magic' wavelength may be used for mixing the {sup 3}P{sub 1} state into the long-living metastable state {sup 3}P{sub 0}, thus enabling the strictly forbidden {sup 1}S{sub 0}-{sup 3}P{sub 0} 'clock' transition in even isotopes of alkaline-earth-metal-like atoms, without a change of the transition frequency. In odd ...

Extensive calculations of the electric-dipole matrix elements in alkali-metal atoms are conducted using the relativistic all-order method. This approach is a linearized version of the coupled-cluster method, which sums infinite sets of many-body perturbation theory terms. All allowed transitions between the lowest ns, np{sub 1/2}, np{sub 3/2} states and a large number of excited states are ...

A general program has been developed to calculate multi-photon processes in atomic hydrogen to arbitrarily high order in perturbation theory. This program can be used to calculate quantities in intense field multiphoton processes, such as the generalized cross section of multiphoton absorption, the a.c. Stark effect (shift and the ...

For a number of years it has been known that the alkali rf-discharge lamps used in atomic clocks can exhibit large amplitude intensity oscillations. These oscillations arise from ion-acoustic plasma waves and have typically been associated with erratic clock behavior. Though large amplitude ion-acoustic plasma waves are clearly deleterious for atomic clock operation, it does not follow that small ...

For a number of years it has been known that the alkali rf-discharge lamps used in atomic clocks can exhibit large amplitude intensity oscillations. These oscillations arise from ion-acoustic plasma waves and have typically been associated with erratic clock behavior. Though large amplitude ion-acoustic plasma waves are clearly deleterious for atomic clock operation, it does not follow that small ...

We report direct single-laser excitation of the strictly forbidden (6s{sup 2}){sup 1}S{sub 0}{r_reversible}(6s6p){sup 3}P{sub 0} clock transition in {sup 174}Yb atoms confined to a 1D optical lattice. A small ({approx}1.2 mT) static magnetic field was used to induce a nonzero electric dipole transition probability between the clock states at 578.42 nm. Narrow resonance linewidths of 20 Hz (FWHM) ...

A superconducting qubit was driven in an ultrastrong fashion by an oscillatory microwave field, which was created by coupling via the nonlinear Josephson energy. The observed Stark shifts of the "atomic" levels are so pronounced that corrections even beyond the lowest-order Bloch-Siegert shift are needed to properly explain the ...

A superconducting qubit was driven in an ultrastrong fashion by an oscillatory microwave field, which was created by coupling via the nonlinear Josephson energy. The observed Stark shifts of the �atomic� levels are so pronounced that corrections even beyond the lowest-order Bloch-Siegert shift are needed to properly explain the ...

This paper summarizes the results of experiments carried out within about a decade in the Atomic and Plasma Physics group at Kiel University. These experiments aimed for the calibration of the Stark effect of Hydrogen spectral lines with special emphasis on the first line of the Balmer-series. Broadening, shift and splitting constants obtained by ...

This work reports new data for the Stark parameters of doubly ionized krypton spectral lines. Stark widths and shifts of Kr iii lines belonging to the UV region (245�300 nm) have been measured. A low-pressure pulsed arc, containing a mixture of 8% krypton and 92% helium, was used as a plasma source. Measured electron densities and ...

The presence of a strong, changing, randomly-oriented, local electric field, which is induced by the photo-ionization that occurs universally in colloidal semiconductor quantum dots (QDs), makes it difficult to observe the quantum-confined Stark effect in ensemble of colloidal QDs. We propose a way to inhibit such a random electric field, and a clear quantum-confined ...

Calculation of the motional Stark effect for B approx. 50 kG shows it to become dominant along Rydberg series of light elements at T approx. 1000/sup 0/C before the diamagnetic shift changes the spectrum from Rydberg to Landau type, thus accounting for the 1/2h..omega../sub c/ spacing observed in Li. This spacing is preserved when both of the competing ...

Stark broadening parameters, widths and shifts, for 84 spectral lines of the doubly-ionized cadmium (Cd III) have been calculated using modified semiempirical approach (MSE). Influence of collisions with charged particles on Cd III UV stellar lines along HR diagram has been discussed. Compared to the Doppler broadening, influence of ...

... thermal conductivity of many common polar and polyatomic ... the reference phase has been shifted in ac- cordance with the system phase shift. ...

In this paper we study the dynamics in the general case for a Tavis-Cummings atom in a nonuniform cavity. In addition to the dynamical Stark shift, the center-of-mass motion of the atom and the recoil effect are considered in both the weak and the strong cavity-atom coupling regimes. It is shown that the spatial motion of the atom inside the cavity in the ...

In this paper we report the measurement of the frequency Stark shift of the ground-state hyperfine transition of {sup 133}Cs observed in a vapor cell through a {lambda} excitation scheme. The measured value of the quadratic Stark coefficient is k=(-2.05{+-}0.04)x10{sup -10} Hz/(V/m){sup 2} when the electric field is perpendicular to ...

Stark widths and shifts of 20 ArII lines were measured in the range of electron densitites from 0.74 to 2.03 x 10(exp 17)/cu cm and at temperatures from 10880 to 13880 K. A wall stabilized cascade arc with a channel diameter of 4 mm was used as a light source. The plasma temperature was calculated from local thermodynamic equilibrium (LTE) plasma equations ...

Transition frequencies of cold molecules must be accurately evaluated to test the variance in the proton-to-electron mass ratio. Measuring the X2?(v,N)=(0,0)?(1,0) transition frequency of optically trapped 174Yb6Li molecules is a promising method for achieving this goal. The Stark shifts induced by trap and probe (for the Raman transition) lasers are ...

Intense, nonresonant laser fields produce Stark shifts that strongly modify the potential energy surfaces of a molecule. A vibrational wave packet can be guided by this Stark shift if the laser field is appropriately modulated during the wave packet motion. We modulated a 70 fs laser pulse with a period on the time ...

... In accordance with one method of this invention ... analog voltage which represents the AC component that is phase shifted by the impedance of the ...

An analysis is made of the Stark effect in a hydrogen atom subjected to a static electric field and the field of a strong resonant electromagnetic wave. It is shown that the resonant interaction modifies the linear (with respect to the static field intensity) splitting of the atomic levels and gives rise to a quadratic shift of sublevels. (AIP)

first find the Stark resonances Sec. III and show that they are localized inside the square, the wave functions of these short-lived resonances are local- ized inside the potential barrier and have-ikx is shifted by the real part of the resonance energy zn, is localized in the region formed by the static

We derive the dynamical Stark width and shift of hydrogenic spectral lines caused by Langmuir turbulence in magnetic fusion plasmas. We show that this additional broadening mechanism can dominate over the Stark broadening by the plasma microfield. Based on this analysis, we propose a method for the spectroscopic diagnostic of Langmuir ...

The Stark spectrum of cesium nD (n = 39{--}50) Rydberg atoms are obtained by a state-selective field ionization method in a magneto-optical trap (MOT). The Stark shifts of Rydberg atoms are measured experimentally, the scalar and tensor polarizabilities of Rydberg atoms are obtained by fitting the experimental data, and the results are ...

Submillimeter laser action has been achieved in ammonia by Stark shifting vibrational absorption lines into resonance with a CO2 laser pump. In two of the three observed cases the absorption line was between states of the same parity, i.e., forbidden in t...

Electroreflectance (ER) was measured for immobilized tryptamine on polycrystaline gold electrode. The measurements were performed in the wavelength region 200-300 nm using the NIST synchrotron radiation source. The ER response was interpreted as a Stark shift in the tryptamine absorption line at 218 nm. The large ER response suggests that the method could ...

A two-color (3+1(')) pump-probe scheme is employed to investigate Rydberg wave packet dynamics in carbon disulfide (CS(2) (*)). The state superpositions are created within the 4f and 5p Rydberg manifolds by three photons of the 400 nm pump pulse, and their temporal evolution is monitored with femtosecond time-resolved photoelectron spectroscopy using an 800 nm ionizing probe pulse. The coherent ...

A scattering mechanism stemming from the Stark-shift of energy levels by electric fields due to interface roughness in semiconductor quantum wells is identified. This scattering mechanism feeds off interface roughness and electric fields and modifies the well known ``sixth-power'' law of electron mobility degradation. This work first treats Stark-effect ...

We report Stark shift measurements for 121Sb donor electronspins in silicon using pulsed electron spin resonance. Interdigitatedmetal gates on top of a Sb-implanted 28Si epi-layer are used to applyelectric fields. Two Stark effects are resolved: a decrease of thehyperfine coupling between electron and nuclear spins of the donor and ...

We report Stark shift measurements for {sup 121}Sb donor electron spins in silicon using pulsed electron spin resonance. Interdigitated metal gates on top of a Sb-implanted {sup 28}Si epi-layer are used to apply electric fields. Two Stark effects are resolved: a decrease of the hyperfine coupling between electron and nuclear spins of ...

The Standard Theory for hydrogen spectral lines asymmetry in dense plasmas is developed on the basis of rigorous and consistent approach with respect to simultaneous and complete account of the quadrupole interaction and the quadratic Stark effect. The complex multiparametric scaling and similarity dependence of the conventional asymmetry parameter for each separate ...

We show that the technique of Stark-chirped rapid adiabatic passage (SCRAP), hitherto used for complete population transfer between two quantum states, offers a simple and robust method for complete population transfer amongst three states in atoms and molecules. In this case SCRAP uses three laser pulses: a strong far-off-resonant pulse modifies the transition frequencies by ...

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The biasing caused by spatial averaging and the measurement errors resulting from vibrational saturation and Stark shifts have been studied theoretically and experimentally for Coherent anti-Stokes Raman Spectroscopy. Both phenomena are significant and limit the applicability of the method.

We present a theoretical description of the interaction of optical waves due to the resonant nonlinear response of an atomic system. We emphasize how the resonant nature of the nonlinear coupling is modified by the shifting of the atomic energy levels as ...

The physics of the two-photon absorption process is investigated for a three-state system. The density-matrix equations for the two-photon interaction are solved in the steady-state limit assuming that the pump laser radiation is monochromatic. Collisional broadening, saturation, and Stark shifting of the two-photon resonance are investigated in detail by ...

When an atom is immersed in a plasma the energy levels are broadened and shifted by the interaction with the fluctuating electric field of the plasma. The authors discuss the effect of this field on the spectral line shape by the use of results from plasm...

A hot plasma composed of helium and ionized nitrogen was created by reflecting the shock wave produced in an electromagnetic T-tube. The plasma temperature was measured by monitoring three nitrogen ion lines, whose intensity is a steep function of tempera...

In collaboration with Bell Laboratories, we developed a model for the ATI photoelectron spectra of argon using 200 fs pulses of UV (308nm), radiation. These spectra provide the first identification of ATI from levels which are Stark shifted by values sign...

Quantum state reconstruction based on weak continuous measurement has the advantage of being fast, accurate and almost non-perturbative. In this work we present a pedagogical review of the protocol proposed by Silberfarb et al (2005 Phys. Rev. Lett. 95 030402), whereby an ensemble of identically prepared systems is collectively probed and controlled in a time-dependent manner so as to create an ...

Electric fields affect any process or transition that involves the movement of charge. Stark spectroscopy is a general term describing the study of spectral changes in the presence of electric fields, and it has proven to be a broadly useful approach for characterizing the change in dipole moment and polarizability for electronic and vibrational transitions. This article ...

Electric fields affect any process or transition that involves the movement of charge. Stark spectroscopy is a general term describing the study of spectral changes in the presence of electric fields, and it has proven to be a broadly useful approach for characterizing the change in dipole moment and polarizability for electronic and vibrational transitions. This article ...

The effect of an externally applied lateral electric field upon an exciton confined in a single InGaN quantum dot is studied using microphotoluminescence spectroscopy. The quantum-confined Stark effect causes a shift in the exciton energy of more than 5 meV, accompanied by a reduction in the exciton oscillator strength. The shift has ...

We present a scheme to realize the basic two-qubit logic gates such as the quantum phase gate and the controlled-NOT gate using a detuned optical cavity interacting with a three-level Raman system. We discuss the role of Stark shifts, which are as important as the terms leading to the two-photon transition. The operation of the proposed logic gates ...

We report the observation of laser-induced structure (LICS) in the flat photoionization continuum of helium. The structure is a strong and spectrally sharp resonance, showing both enhanced and diminished ionization (a Beutler-Fano profile). Our observations show, in an otherwise unstructured continuum, pronounced ionization suppression (as much as 70%), which is due to population trapping ...

We have investigated the nonlinear optical properties of a new class of strained-layer superlattices, the intrinsic Stark effect superlattices (ISES). The superlattices consisted of GaInAs/GaAs grown along the (211)B direction. We observed a shift of the excitonic absorption to higher energies (blue shift) with increasing intensity of ...

We have measured the dc Stark shift of the 6S-->7S transition in atomic cesium using laser spectroscopy. The result of our experiment is 0.7262(8) Hz (V/cm)-2. This value disagrees with a previous experiment but is within 0.3% of the value predicted by ab initio calculations. This measurement removes the largest outstanding disagreement between ...

Stark parameters (width and shift) of four doubly ionized nitrogen spectral lines, that belong to 3s-3p and 3p-3d transitions (lower multiplets), have been measured in a linear pulsed, low pressure, arc discharge in the nitrogen-oxygen and helium-nitrogen-oxygen plasmas in a (30 000 - 54 000) K electron temperature and a (0.75 10(23) - 2.8 10(23) ) \\ ...

We study the classical, semiclassical, and quantum dynamics of parabolic Rydberg states of hydrogen subject to half-cycle electromagnetic pulses as a function of the field strength and the duration of the pulses. We show that for the most ``red-shifted`` Stark state the quantum ionization probability oscillates around the classical value. These ...

Dynamics of multilevel molecules and pulse propagation is studied near the two-photon resonance. We have found a strict solution of this problem beyond the rotating wave approximation. Our analytical solution is in close agreement with the strict numerical solution for the 4,4' -bis(dimethylamino) stilbene molecule. The compensation of the dynamical Stark ...

Theoretical and experimental findings are presented which describe the broadening of the levels of shifted terms in the VV and TiIV ions below the ionization boundary in the plasma of a vacuum arc. The results indicate that the observed effect is a new manifestation of a configurational interaction in the atomic spectra. More specifically, the broadening is due to the ...

Recently published Stark widths and shifts measured and calculated data and their dependence on the upper level ionization potential {chi} are used here to demonstrate the existence of the other kinds of reularities within similar spectra of different elements and their ionization stage. The emphasis is on the Stark parameter ...

The proper description of the electric environment of condensed phases is a critical challenge for force field methods. To test and validate the ability of the CHARMM additive force field to describe the electric environment in aqueous solution combined QM/MM calculations have been used to calculate the vibrational Stark effect (VSE). We utilized a first principles methodology ...

We report a strong Stark effect in electroluminescence (EL) from thin silicon-on-insulator metal-oxide-semiconductor field-effect transistors. The EL peak shows a large Stark shift of up to 50 meV when a gate-induced electric field is applied. Such a large shift is observed because of the strong confinement of ...

We demonstrate that strongly polarized quasi-one-dimensional very-high-n (potassium) Rydberg atoms can be produced by photoexcitation of selected Stark states in the presence of a weak dc field. Calculations show that, for m=0 states, significant photoexcitation occurs only in the vicinity of the Stark-shifted s, p, and d levels, and that those states ...

The resonance frequency of an InAs quantum dot strongly coupled to a GaAs photonic-crystal cavity was electrically controlled via the quadratic quantum confined Stark effect. Stark shifts up to 0.3 meV were achieved using a lateral Schottky electrode that created a local depletion region at the location of the quantum dot. We report ...