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Doppler broadening

About: Doppler broadening is a research topic. Over the lifetime, 5509 publications have been published within this topic receiving 92552 citations.


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Journal ArticleDOI
TL;DR: The observation of electromagnetically induced phase matching in collisionally broadened Pb vapor at a critical intensity at which the Rabi frequency of a dressing 1064-nm laser overcomes the Doppler broadening of the vapor.
Abstract: We report the observation of electromagnetically induced phase matching in collisionally broadened Pb vapor. At a critical intensity at which the Rabi frequency of a dressing 1064-nm laser overcomes the Doppler broadening of the vapor, the generated four-frequency-mixing signal at 283 nm increases in a steplike manner by a factor of 59.

43 citations

Journal ArticleDOI
TL;DR: In this paper, high-resolution spectroscopy of atomic and molecular lines in a hydrogen-methane-argon plasma was used for the investigation of the gas temperature and the atomic hydrogen concentration as a function of process parameters (power, pressure, and methane concentration) during microwave-plasma-assisted CVD of oriented diamond films on silicon(100) substrates.

43 citations

Journal ArticleDOI
J. Botineau1, Roger H. Stolen1
TL;DR: In this paper, it is shown that spectral self-broadening can be treated as self-phase modulation or three-wave mixing, and that these are simply different representations for the same process.
Abstract: It is shown by theory and experiment that spectral self-broadening in optical fibers is enhanced in fibers that maintain linear polarization. Spectral self-broadening can be treated as self-phase modulation or three-wave mixing, and we show that these are simply different representations for the same process.

43 citations

Journal ArticleDOI
TL;DR: In this article, Bernath et al. compared simulated CH and CN absorption line profiles for high-temperature (T = 1200 K) thermal broadening and for a combination of lowtemperature thermal plus turbulent broadening at a lambda/Delta-lambda ratio of about 100,000.
Abstract: Recent high-resolution observations of interstellar absorption lines of CH and CN toward Zeta Oph obtained by Crane et al. (1986), and Palazzi et al. (1988), exhibit line widths that suggest thermal line broadening at high temperature, T about 1200 K. Observations of CO line emission at 2.6 mm toward Zeta Oph (Langer et al.,1987) indicate that the molecular gas resides in four distinct velocity components that span less than 3 km/s in Doppler velocity. Simulated CH and CN absorption line profiles are compared for high-temperature (T = 1200 K) thermal broadening and for a combination of low-temperature (T = 50 K) thermal plus turbulent broadening. It is shown that the two broadening models reproduce existing observations comparably well and are virtually indistinguishable at a lambda/Delta-lambda ratio of about 100,000. The observed differences in the CH and CN line widths may reflect slightly different distributions of those molecules along the line of sight. The simulations use very recent, improved laboratory spectroscopic data on CH (Bernath). Some related consequences of such unresolved velocity structure on the ultraviolet absorption lines of CO are examined. Indirect diagnostics of temperature in the Zeta Oph cloud favor low-temperature thermal plus turbulent broadening, and the implied rate of dissipation of turbulence is in harmony with estimates of the global input of mechanical energy into to interstellar medium.

43 citations

Journal ArticleDOI
TL;DR: It can be expected that water vapor retrieval will be possible with good accuracy even in the most critical cases, where steep gradients in aerosol backscattering exist in the upper troposphere.
Abstract: An evaluation scheme is given to calculate the water vapor content from data obtained by differential absorption lidar (DIAL), taking into account that the Rayleigh scattered part of the return signal shows considerable spectral broadening in contrast to the Mie scattered part. To correct for errors caused by this effect, information on the aerosol backscattering properties is necessary. Sensitivity analysis performed by model calculations show that it can be retrieved with sufficient accuracy from the off-line signal in the same way as for backscatter lidar. It can be expected that water vapor retrieval will be possible with good accuracy even in the most critical cases, where steep gradients in aerosol backscattering exist in the upper troposphere.

42 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202331
202290
2021122
2020134
2019128
2018122