This paper reports on the measurement of the absorption and reduced scattering coefficients of apples via a new spatially-resolved hyperspectral imaging technique and their correlation with fruit firmness and soluble solids content (SSC). Spatially-resolved hyperspectral scattering profiles were acq...

... This has been used to measure absolute absorption coefficients versus wavelength for multiple quantum wells having rectangular ... ndt dnP A ...

Two-wavelength laser-excited fluorescence and laser-enhanced ionization are investigated for use with spatial profiling applications. A recently introduced absorption technique (which involves measuring the differential absorption of a probe beam with a p...

Continuous, high quality profiles of water vapor, free of systematic bias, and of moderate temporal and spatial resolution, acquired over long periods at low operational and maintenance cost, are fundamental to the success of the ARM CART program. The dev...

We show that the spatial decay of plasmons in a periodic metal-nanoparticle chain is composed of exponential and power-law decays. Our results show a high level of similarity between the absorptive and radiative decay channels. By analyzing the poles (and the corresponding residues) of the generating function for the lattice Green's function, we explain ...

It is important for near-infrared imaging to estimate the sensitivity of detected signal to the change in absorption of tissue resulting from brain activation and the volume of tissue interrogated for a specific source-detector spacing. In this study, light propagation in adult head models is predicted by Monte Carlo simulation in order to investigate the effect of the ...

A method, based on the optoacoustic effect for determination of the spatial distribution of the light intensity in turbid media and of the optical characteristics of such media was proposed (and implemented experimentally). A temporal profile of the pressure of a thermo-optically excited acoustic pulse was found to be governed by the ...

Multiphoton absorption of 2,5-bis[4-(2-N,N-diphenylaminostyryl)phenyl]-1,3,4-oxadiazole was experimentally studied by using femtosecond laser pulses. This material demonstrates a very broad multiphoton absorption band of around 300 nm width with two peaks of 1250 and 1475 nm. The first peak results from the three-photon absorption ...

The spatial pulse profile makes experimental values of Two-and three photon absorption (TPA and 3PA) coefficient deviate from its true value. We report an approach taking account of the influence of pump laser pulse profile on the nonlinear absorption coefficients (NAC) in Z-scan technique. We ...

The spatial redistribution of energy resulting from the interaction between a near-diffraction-limited nanosecond laser pulse and the nonlinear absorbing optical limiting dye silicon naphthalocyanine is described, for what is to our knowledge the first time, in an optical geometry that is likely to be found in practical applications. For input fluences above that required for ...

Imprisonment of resonant radiation in an expanding sphere on the basis of the numerical solution of the rate balance equation for excited atoms and the transfer resonance radiation equation is investigated. Calculations of the escape factor for sphere at Doppler form of absorption and scattering profiles are executed. The effect of spectral shift of the ...

Because the FeII lines are connected by optically-thin transitions to fine-structure levels, their profiles more closely reproduce the intrinsic opacity of the wind. Together these results naturally explain the absorption and emission-line characteristics observed for star-forming galaxies at z<1. We also study a scenario promoted to describe the ...

Electron cyclotron resonance frequency wave and absorption theory and ray tracing are reviewed and a numerical model for the study of electron heating in tandem mirror plugs and barriers is presented. It is found that substantial shifts in the spatial energy deposition profile occur from the cold plasma electron cyclotron resonance at ...

... Title : Optical Absorption Depth Profiling of Photodegraded Poly (Vinylchloride) (PVC) Films by Quantitative Photothermal Deflection Technique,. ...

... Title : ULTRASONIC ABSORPTION SPECTROSCOPY IN FLUIDS BY OPTICAL DETECTION OF PHOTOACOUSTIC PULSE PROFILES. ...

... Title : EFFECT OF VOLUMETRIC ABSORPTION COEFFICIENT ON ... Abstract : In calculating the temperature profile and heat transfer ...

... Title : EFFECT OF VOLUMETRIC ABSORPTION COEFFICIENT ON ... Abstract : In calculating the temperature profile and heat transfer ...

We present a study of the short-time scale (< 250 ns) fluid dynamic response of water to a fiber-delivered laser pulse of variable energy and spatial profile. The laser pulse was deposited on a stress confinement time scale. The spatial profile was determined by the fiber core radius r (110 and 500 microns) and ...

This work couples a tandem mirror transport code with an ECRH ray tracing and absorption code to calculate self-consistently the heating profile and the plasma density and temperatures profiles. A mechanism is developed that produces 3-dimensional models from the radial profiles of transport codes. Using this ...

The pulsed photoacoustic spectroscopy technique is one of the oldest but respectable techniques which offer some unique features that are relevant to trace gas monitoring. Despite obvious advantages there are some drawbacks that have so far alienated this spectroscopy technique from routine air monitoring. One of them is the additional instrumentation necessity to fulfill the requirement for an ...

It is shown that the equations relating the radial profiles of the volume emission and absorption coefficients to the transmission and emitted intensity profiles in self-absorbing cylindrically symmetric sources, can be written in such a way that the problem of spatially resolving the volume emission coefficient ...

High resolution electron density profiles were obtained with the incoherent scatter radar EISCAT at Ramfjordmoen over the height range 70-130 km during a period of auroral radio absorption events. The experiment, which was specially designed for D-region study, was carried out with a vertical radar beam and was based on a Barker-coded multipulse scheme ...

... Accession Number : ADD323263. Title : A NOVEL METHOD FOR SPATIAL PROFILING OF LASER BEAMS. Corporate Author : ...

The first detection of the silicate absorption feature in Active Galactic Nuclei (AGNs) was made at 9.7?m for the prototypical Seyfert 2 galaxy NGC1068 35 yr ago, indicating the presence of a large column of silicate dust in the line of sight to the nucleus. It is now well recognized that type 2 AGNs exhibit prominent silicate absorption bands, while the ...

Two-photon absorption (2PA) measurements in ADP and in KD(asterisk)P are reported on in some detail. Measurements of nonlinear absorption in these materials and measurements of linear and nonlinear absorption at the second harmonic frequency are presented and discussed. Effects of 2PA on second harmonic generation, parametric ...

... Title : STEP RESPONSE AND SPATIAL RESOLUTION OF AN OPTICAL HETERODYNE PROFILING INSTRUMENT. Corporate Author : ...

Atomic spectroscopic methods have been widely accepted for the analyses of many elements. Optimizations of the analytical signals require thorough fundamental understanding of each elemental step involved in a particular measurement. Important parameters such as spatially resolved temperature and concentration profiles of the atomizers are necessary for ...

The authors research goal was to develop nonintrusive, laser-based optical diagnostic tools for the investigation of trace amounts of molecular species in hostile environments such as plasmas, flashes, flames and other combustion forms. By extending their study on spectroscopic applications of degenerate four-wave mixing (DFWM), they proposed to exploit a new absorption ...

A scattering scheme to probe the time evolution of femtosecond pulses of a soft X-ray free-electron laser (FEL) in a multilayer structure is presented. The response of periodic multilayers (MLs) with low and high absorption and various numbers of bi-layers to a pulse train of Gaussian-shaped sub-pulses is calculated. During the passage of the incident pulse the interaction ...

Microplasmas were diagnosed by spatially resolved diode laser absorption using the Ar 801.4 nm transition (1s5-2p8). A 900 MHz microstrip split ring resonator was used to excite the microplasma which was operated between 100-760 Torr (13-101 kPa). The gas temperatures and the Ar 1s5 line-integrated densities were obtained from the atomic ...

Transverse oscillations and propagating waves are frequently observed in threads of solar prominences/filaments and have been interpreted as kink magnetohydrodynamic (MHD) modes. We investigate the spatial damping of propagating kink MHD waves in transversely nonuniform and partially ionized prominence threads. Resonant absorption and ion-neutral ...

A version of the perturbation theory is developed for determining the field distribution of spatial solitons with a 2D transverse profile in a medium with saturable absorption and gain in the case of small deviations from paraxial conditions. Starting from the unperturbed paraxial soliton with the linear polarisation of radiation, an ...

Imprisonment of resonant radiation in gases on the basis of the numerical solution of the rate balance equation for the excited atoms and the transfer resonant radiation equation is investigated. Calculations of the escape factor for the slab, cylinder and sphere at Doppler and Lorentz forms of absorption and scattering profiles are executed. Calculation ...

A technique for instantaneously viewing discrete points along an anomalous dispersion curve has been successfully demonstrated. A Fabry-Perot interferometer was used to spatially resolve the axial modes of an HF probe laser. A Michelson interferometer, one leg of which contained an HF absorption cell, imposed lines of constant phase. Recorded fringe shifts ...

The comparative research of production and loss of atoms (F, H) and radicals (CF2), important for plasma processing, is carried out in DF CCP plasma in Ar/CF4 and Ar/CHF3 mixtures modeling two etching plasmas (fluorine-rich) and (fluorine-poor) respectively. Electron density, electron temperature and ion energy spectra are measured for single and dual frequency discharge modes. ...

... ABSORPTION SPECTRA, ABSORPTION, OVERLAP, DYE ... FLOW, DOPPLER EFFECT, GAS FLOW ... PATHS, HIGH TEMPERATURE, VOLUME ...

It is proposed that the spatially modulated superfluid phase, or the Fulde-Ferrell-Larkin-Ovchinnikov state could be observed in resonant fermion atomic condensates which are realized recently. We examine optimal experimental setups to achieve it by solving the Bogoliubov-de Gennes equation for both idealized one-dimensional and realistic three-dimensional cases. The ...

It is proposed that the spatially modulated superfluid phase, or the Fulde-Ferrell-Larkin-Ovchinnikov state could be observed in resonant fermion atomic condensates which are realized recently. We examine optimal experimental setups to achieve it by solving the Bogoliubov de Gennes equation for both idealized one-dimensional and realistic three-dimensional cases. The ...

A numerical method of inverting a single absorption line profile is described. It determines the largest set of significant parameters which describe the atmosphere forming the line. The method is general in application, but it has been developed using a sodium D/sub 2/ line profile measured at the center of the disc of the ...

Observations of the spatial structure and motion of auroral absorption regions obtained with the 38.2-MHz imaging riometer for ionospheric studies (IRIS) at South Pole Station, Antarctica, have been used to simulate the absorption that should be measured by the 20.5-, 30-, 38.2-, and 51.4-MHz broad-beam riometers also operating at the ...

We analyze the absorption and emission-line profiles produced by a set of simple, cool gas wind models motivated by galactic-scale outflow observations. We implement Monte Carlo radiative transfer techniques that track the propagation of scattered and fluorescent photons to generate one-dimensional spectra and two-dimensional spectral images. We focus on ...

... AND SPATIAL STRUCTURE OF COMPLEX AURORAL RADIO- ABSORPTION EVENTS IN: PLANETARY AND SPACE SCIENCE, VOL24, NO1 ...

A two-photon absorption, laser-induced fluorescence (TALIF) diagnostic is being designed to measure the neutral deuterium profile in the plasma scrapeoff layer and pedestal, near the divertor X-point. Spatially resolved data are desired over the region 0.95-1.0 in normalized ?, to address how neutral ionization affects the pedestal ...

The problem of opto-acoustic (AO) diagnostics of light scattering and absorption in biological media is considered. The objects under study were milk, bovine and porcine liver, and bovine muscle tissue. The forward and backward schemes for recording acoustic signals were used in experiments. The spatial distribution of the light intensity was measured for ...

Spatial and temporal changes of temperature in a novel polymer are investigated by using the Z-scan technique under ns laser pulse excitation. According to the open aperture Z-scan experimental results, the nonlinear absorption coefficient of the polymer is determined. By solving the diffusion equation of heat conduction induced by optical ...

An experimental set-up is presented for wavelength and spatially resolved reflectance measurements (SRR) via optical fibers and imaging optics. In order to characterize the set-up, we made a set of silicone rubber phantoms with different absorber and scatterer concentrations. The remission profiles gained from the phantoms are the input for a look-up table ...

The problem of opto-acoustic (AO) diagnostics of light scattering and absorption in biological media is considered. The objects under study were milk, bovine and porcine liver, and bovine muscle tissue. The forward and backward schemes for recording acoustic signals were used in experiments. The spatial distribution of the light intensity was measured for ...

Microwave fields in an extended electron cyclotron resonance (ECR) plasma reactor were analyzed in the resonant cavity from Maxwell's equations, and a formalism of microwave absorption was investigated at the resonance zone with plasma kinetic theory and simulated using a two-dimension computer hybrid-code. The results indicated that there are three typical power deposition ...

In this paper we examine the profiles of the complex Na I D-lines in the Red Rectangle. The spectra were acquired with the Astrophysical Research Consortium Echelle Spectrograph (ARCES) echelle spectrograph (R= 38 000) on the 3.5-m telescope at the Apache Point Observatory. Additional spectra taken with Space Telescope Imaging Spectrograph were acquired from the Hubble Legacy ...

Preparatory calculations of microwave transmission through the MTX access duct, propagation of the waves through the plasma and the resulting power deposition profile on a calorimeter located on the tokamak inside wall have been performed. The microwave transmission calculations include the relative phase slippage of waveguide modes in the duct to determine the ...

In the present work results are presented for two types of optical measurements of PAH in fuel rich systems: ultraviolet absorption spectroscopy (in a flowing pyrolysis tube and in a slot burner supporting a diffusion flame) and visible laser-induced fluorescence. Preliminary results show that the absorption spectrum obtained in a flowing, 50 torr mixture ...

Excimer laser radiation changes the physical and optical properties of fused silica. These changes include compaction of the glass and induced absorption, both of which have an impact on the expected lifetime of silica lenses used in optical microlithography. We report on our ongoing study of excimer laser induced changes in fused silica. We use a fully automated experimental ...

The authors develop a simple intuitive picture of the vibration-rotation structure of the SF/sub 6/ molecule such that the molecular susceptibility responsible for self-focusing can be calculated. They treat the propagation dynamics by generalizing the standard steady-state Gaussian propagation equations to include the important effect of absorption in the wings of the ...

A ground-based differential Absorption Lidar (DIAL) system has been implemented at CEILAP laboratory, located in the Buenos Aires industrial suburbs, The goal was to perform measurements of the stratospheric ozone layer. Since early 199 systematic measurements of zone concentration profiles from approximately 18 to 35 km altitude are performed. Our ...

Using planar polystyrene targets with embedded Al tracer dots, improved x-ray spectroscopic measurements of density and temperature profiles in laser-produced plasmas were obtained. Time-integrated, spatially resolved spectra of the Al tracer emission were collected at laser intensities where the energy absorption and transport is ...

The influence of the subcutaneous adipose tissue on near infra-red light propagation in leg muscle and on the sensitivity of NIR O2 monitor is investigated. The simulation model is half infinite medium consisting of skin, adipose and muscle layer. The optical properties of each layer are chosen from the reported data and the absorption coefficient of muscle is rectified by ...

We demonstrate direct measurements of the absolute molecular two-photon absorption (TPA) cross-sections using a fluorescence technique. A theoretical model of the detected fluorescence signal generated by a femtosecond laser pulse was developed. It is shown that the onset of excited-state saturation depends on the TPA cross-section and the local intensity but is independent of ...

Powerful high-frequency radio waves can heat the electrons in the D region of the ionosphere. This heating increases the electron-neutral collision frequency which modifies the absorption of other radio waves propagating through the heated plasma. A high spatial resolution imaging riometer was used to observe changes in cosmic radio noise ...

The objective of this research was to measure the absorption and reduced scattering coefficients (?a and ?s', respectively) of apples via a spatially-resolved hyperspectral imaging technique and relate them to fruit firmness and soluble solids content (SSC). Spatially-resolved hyperspectral images were acquired from 600 'Golden ...

profiles obtained by differential absorption lidar (DIAL) analysis. ... Differential absorption lidars (DIAL) have been and continue to be widely used for the ...

Single pass absorption experiments using fundamental, O-mode ECH waves have been performed in the Microwave Tokamak Experiment (MTX) and found to be consistent with linear absorption theory, as predicted for the ECH source which is a 140 GHz, 400 kW CW gyrotron. These experiments provide the basis for comparison with future Free Electron Laser (FEL) ...

... In addition the relative emission coefficient, the relative temperature and the optical density profile can be determined. (Author). ...

... Title : FREE CARRIER DENSITY PROFILING BY SCANNING ... UPON THE FREE CARRIER ABSORPTION OF ... POWER FREE CARRIERS PER CM ...

The theory of differential absorption lidar measurements for lines with a Voigt profile is given and

Voigt profile, continuum absorption model of AER (Clough et al.);. " atmospheric profiles of Standard Models (MODTRAN3.0) ...

Laser absorption spectroscopy (LAS) has been used by the Atomic Vapor Laser Isotope Separation (AVLIS) program for over 10 years to monitor the co-vaporization of uranium and iron in its separators. During that time, LAS has proven to be an accurate and reliable method to monitor both the density and composition of the vapor. It has distinct advantages over other rate ...

A thermally assisted laser-induced fluorescence (LIF) detection system is developed to measure two-dimensional spatial profiles of number density of alkali atoms seeded in an open-cycle MHD generator, especially in the boundary layer on channel electrodes. The spatial resolution of this system is evaluated to be 1.3 mm. To assess the ...

The spatial probability distribution associated with diffusion and attenuation in partially absorbing media is studied. An equivalence is established between a system with free diffusion for x> 0 and partial absorption for x < 0, and a semi-infinite system (x> 0) with a radiation boundary condition at x = 0. By exploiting this equivalence, it is ...

More and more electronics are to be used under various adverse environments at high temperatures with high humidity. Spatial distributions of internal charge carriers mainly due to ionic impurities that appear in hot and humid environments are considered to affect the reliability of bulk insulation. Therefore, the authors examined space charge behavior inside ...

Continuous, high quality profiles of water vapor, free of systematic bias, and of moderate temporal and spatial resolution are fundamental to the success of the ARM CART program. In addition, these should be acquired over long periods at low operational and maintenance cost. The development and verification of realistic climate model parameterizations for ...

Investigations of optical losses induced by localized plasmons in protrusions on silver back contacts of thin-film silicon solar cells are presented. The interaction of electromagnetic waves with nanoprotrusions on flat silver layers is simulated with a three-dimensional numerical solver of Maxwell's equations. Spatial absorption ...

The Tropospheric Emission Spectrometer (TES) is an infrared instrument that was launched on board NASA's Aura satellite in 2004. TES is the first instrument to provide vertical information on tropospheric ozone while simultaneously measuring CO on a global basis. Before they may be used for scientific study, TES profiles must first be validated to determine if there are any ...

... zsj.18.51 Temporal and Spatial Profiles of Alkaline Phosphatase Activity During Embryogenesis of Amphioxus Branchiostoma belcher...

... PROFILE IN THE IONOSPHERIC D-REGION FROM THE FREQUENCY DEPENDENCE OF RADIO WAVE ABSORPTION-GEOMAGNETISM AND ...

... CONCENTRATION PROFILE IN THE D-LAYER OF THE IONOSPHERE FROM THE FREQUENCY DEPENDENCE OF RADIO WAVE ABSORPTION ...

The design and operation of a differential absorption lidar system capable of remotely measuring the

? Car is surrounded by multiple layers of ejecta with considerable velocity differences. With HST/STIS, we can separate the star from bright, nearby nebular structures not resolved from the ground resulting in increased insight on the structure of the stellar system and its nearby ejecta. The HST/STIS MAMA imaging echelle mode provides near-diffraction-limited spatial ...

An investigation was conducted to explore the use of infrared and ultraviolet emission-absorption spectroscopy for determination of temperature profiles in flames. Spectral radiances and absorptances were measured in the 2.7-micron H2O band and the 3064-A...

Calculation was made of the line profiles to be expected when a Fabry-Perot interferometer is used to measure absorption lines. It is shown that large errors may be introduced in the measurement of the integrated absorption, even when an interferometer of...

Cool star winds can best be observed in resonance absorption lines seen in the spectrum of a hot companion, due to the wind passing in front of the blue star. We calculated absorption line profiles that would be seen in the ultraviolet part of the blue co...

Use of Lipid Profiles of Euphausia superba as a Parameter for Determining Dietary Preferences & the Abundance & Spatial Distribution of krill ...

Use of Lipid Profiles of Euphausia superba as a Parameter for Determining Dietary Preferences & the Abundance & Spatial Distribution of krill ...

... Report Date : MAR 1976. ... SPATIAL DISTRIBUTION, OPTIMIZATION, MODELS, PROFILES, NUCLEAR REACTORS, REACTOR FUELS, AXIAL ...

... Title : NDT Profiling of Dopants and Photoconductivity in Si with High Spatial Resolution Using Evanescent Microwave Probes,. Corporate Author : ...

Argo Analysis for desert biome. Errors of Profiles. Spatial Distribution of Profile Errors. 3-D density predictions at 4km resolution ...

We discover that a spatially localized gain supports stable vortex solitons in media with cubic nonlinearity and two-photon absorption. The interplay between nonlinear losses and gain in amplifying rings results in the suppression of otherwise ubiquitous azimuthal modulation instabilities of radially symmetric vortex solitons. We find that the topology of ...

Knowledge of the Hg(/sup 3/P/sub 1/) spatial distribution in Hg rare gas low pressure discharges is important for understanding radiation transport, and aids in the formulation of discharge models for fluorescent lamps. We report on a novel single laser, two intersecting beams technique, which, for the first time, yields pinpoint information on the radial density ...

We report on a new spatial beam-shaping approach for fabrication of waveguides with a circular transverse profile by femtosecond laser pulses, using an astigmatic beam and controlling both beam waist and focal position in the tangential and sagittal planes. We apply this technique to write single-mode active waveguides at 1.5microm in Er:Yb-doped glass ...

Calculations are discussed using the 2D Lagrangian code LASNEX to simulate irradiation of Parylene discs. Using a representation of the experimental beam profile, geometric optics propagation, and an absorption model based on plasma simulations, the scattered light angular intensity distribution can be obtained. The use of a suprathermal electron ...

Space resolved concentrations of helium He* (3S1) and argon Ar* (3P2) metastable atoms in an atmospheric pressure radio frequency micro-plasma jet were measured using tunable diode laser absorption spectroscopy. Even small absorptions down to 10-4 could be measured using lock-in technique. The absolute density of metastable atoms densities at different ...

Four intense Solar Cap Absortion (PCA) events were observed in Autumn 1989 during the increasing phase of the sunspotcycle 22. The recurrence periods for these PCA events were 47, 20 and 41 days. For one event studied in detail spatial nonuniformity was observed in the latitude profiles of the electron density in the D region. During the course of the PCA, ...

We describe and example the Beam Propagation Method (BPM) used to model and simulate nonlinear refractive and absorptive effects in materials with applications to optical limiting and switching. Various scenarios including laser-beam trapping and laser-beam division are investigated, in order to demonstrate the power of the BPM. A novel technique is also described for ...

Characteristics of cw lasers with intracavity absorption are discussed by taking account of the spatial relaxation as well as mode competition. A comparison is made with the conventional single-path absorption method, under the same conditions, for estimating the absorption enhancement factor. Weak ...

The benefits of retrieving ozone concentration profiles by a use of a single Raman signal rather than the Raman differential absorption lidar (DIAL) technique are investigated by numerical simulations applied either to KrF- (248 nm) or to quadrupled Nd:YAG- (266 nm) based Raman lidars, which are used for both daytime and nighttime monitoring of the ...

The Owens Valley Radio Observatory interferometer has been used to carry out a program of aperture synthesis in the interstellar neutral hydrogen absorption line. Maps having resolutions of 0.2 km s/sup -1/ and about 1.3 have been produced using a novel Fourier inversion method. This paper is devoted to discussions of the observing and analyzing procedures and of the ...

We have presented theoretical and experimental investigations of nanosecond (ns) deep-ultraviolet (DUV) 177.3 nm radiation by means of second harmonic generation (SHG) from a frequency-tripled Nd:YAG laser (355 nm, 49 ns and 10 kHz) in KBe2BO3F2 (KBBF) nonlinear crystal for the first time. A DUV KBBF-SHG numerical model, accounting for linear absorption, pump depletion, beam ...

Analytical solution;; Uniform accuracy in spatial resolution & angles. RT with Gaseous Absorption. LBL absorption based on HITRAN-2000 and continuum ...

Internal defect in pickling cucumbers can cause bloater damage during brining, which lowers the quality of final pickled products and results in economic loss for the pickle industry. Hence it is important to have an effective optical inspection system for detection and segregation of defective pickling cucumbers. This research was intended to measure the spectral absorption ...

The characteristics of photoelectron microbunches emitted from a photocathode in response to laser irradiation determine many of the incident laser pulse requirements. RF photocathode designs based on grazing incidence of the irradiation benefit from the removal of launch optics from the electron beamline and enhanced absorption at Brewster angles. However, this also ...

A method for calculating the X-ray resonance line emission from a cylindrically expanding laser-produced plasma is presented. A multi-frequency line transfer algorithm, incorporated as a post-processor to a time-dependent 1-D hydrodynamics and non-LTE atomic physics calculation, is used to compute spatially-resolved spectral profiles of the line emission. ...

The self-image phenomenon by a volume grating is proposed and theoretically analyzed. A theoretical model based on a path integral formulation to describe wave propagation through the grating inhomogeneous medium is applied. A modified version of the scalar diffraction theory Fresnel propagator is obtained which allows calculating the diffracted field amplitude by the grating. The proposed model ...

Radiative efficiency of emission of resonance radiation from a dc glow discharge plasma is derived experimentally from spatial density profiles of atoms in resonant states. Density profiles are determined by tunable diode laser absorption spectroscopy. Resonance radiation transport is considered both by Lawler and ...

Photoluminescence (PL) is often used to characterize electronic transitions in a semiconductor. In general, the PL spectra from the n- and p-regions of a diode are markedly distinct from one another. PL from the high field depletion region of the diode is very nearly zero. By using several laser wavelengths, with a range of absorption coefficients, the authors have excited ...

By means of schematic line profile calculations based upon the Sobolev approximation (Castor, 1970), it is shown how spatial extension of the embedded, illuminating continuum source alters the character of resonance line profiles formed in a high-speed wind. The intended application for these calculations is to the winds of cataclysmic ...

Space and time resolved concentrations of helium He (3S1) metastable atoms in an atmospheric pressure radio-frequency micro-plasma jet were measured using tunable diode laser absorption spectroscopy. Spatial profiles and lifetime measurements show significant influences of air entering the discharge from the front nozzle and of ...

Using recently published results of intrinsic and free carrier nonlinear absorption coefficients in InP, nonlinear refraction was investigated at 1.064 ?m using ns duration lasers to characterize refraction from generated free carriers. A phase retrieval algorithm was implemented to determine the amplitude and phase profiles of the incident beam. Accurate ...