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Title: Spectral and far-field broadening due to stimulated rotational Raman scattering driven by the Nike krypton fluoride laser

Authors:
; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1409724
Resource Type:
Journal Article: Published Article
Journal Name:
Applied Optics
Additional Journal Information:
Journal Volume: 56; Journal Issue: 31; Related Information: CHORUS Timestamp: 2017-11-21 16:32:17; Journal ID: ISSN 1559-128X
Publisher:
Optical Society of America
Country of Publication:
United States
Language:
English

Citation Formats

Weaver, James, Lehmberg, Robert, Obenschain, Stephen, Kehne, David, and Wolford, Matthew. Spectral and far-field broadening due to stimulated rotational Raman scattering driven by the Nike krypton fluoride laser. United States: N. p., 2017. Web. doi:10.1364/AO.56.008618.
Weaver, James, Lehmberg, Robert, Obenschain, Stephen, Kehne, David, & Wolford, Matthew. Spectral and far-field broadening due to stimulated rotational Raman scattering driven by the Nike krypton fluoride laser. United States. doi:10.1364/AO.56.008618.
Weaver, James, Lehmberg, Robert, Obenschain, Stephen, Kehne, David, and Wolford, Matthew. 2017. "Spectral and far-field broadening due to stimulated rotational Raman scattering driven by the Nike krypton fluoride laser". United States. doi:10.1364/AO.56.008618.
@article{osti_1409724,
title = {Spectral and far-field broadening due to stimulated rotational Raman scattering driven by the Nike krypton fluoride laser},
author = {Weaver, James and Lehmberg, Robert and Obenschain, Stephen and Kehne, David and Wolford, Matthew},
abstractNote = {},
doi = {10.1364/AO.56.008618},
journal = {Applied Optics},
number = 31,
volume = 56,
place = {United States},
year = 2017,
month =
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1364/AO.56.008618

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  • We present the results of a comprehensive analytical and numerical study of ultrawide spectral broadening and compression of isolated extremely short visible, uv-vuv and middle infrared (MIR) pulses by high-order stimulated Raman scattering in hollow waveguides. Spectral and temporal characteristics of the output pulses and the mechanism of pulse compression using dispersion of the gas filling and output glass window are investigated without the slowly varying envelope approximation. Physical limitations due to phase mismatch, velocity walk off, and pump-pulse depletion as well as improvements through the use of pump-pulse sequences and dispersion control are studied. It is shown that phase-lockedmore » pulses as short as {approx}2 fs in the visible and uv-vuv, and 6.5 fs in the MIR can be generated by coherent scattering in impulsively excited Raman media without the necessity of external phase control. Using pump-pulse sequences, shortest durations in the range of about 1 fs for visible and uv-vuv probe pulses are predicted.« less
  • Thomson scattering was used to measure the spectrum of Langmuir waves, in both frequency and wave number, driven below quarter-critical density by a laser beam. These measurements were capable of detecting and identifying waves driven by stimulated Raman scattering (SRS) and also of detecting waves driven by other effects such as the bump-on-tail instability postulated by the enhanced Thomson scattering model of Raman emission. The observed Langmuir waves were consistent with SRS and not with other possible sources. The width in {ital k}-space of the measured Thomson scattering signals also has implications for the saturation amplitude of the Langmuir waves.more » {copyright} {ital 1999 American Institute of Physics.}« less
  • Transverse modulational instabilities have been observed in two high-energy laser experiments. In one experiment a collimated laser beam with a 351-nm wavelength propagated through air and generated stimulated rotational Raman scattering. In the second experiment a 1-kJ laser pulse with a 1054-nm wavelength was focused into a spatial filter having a 50-{mu}m residual pressure. In both experiments the transverse modulational instability took the form of a hexagonal emission pattern in the interaction region. The instability can be understood from an analysis in the plane-wave approximation.
  • Measurements were made of the gain of stimulated Raman scattering by rotational levels of gaseous hydrogen in the case when the directions of rotation of the polarizations of the pump (neodymium laser) radiation and of the Stokes signal coincided or were opposite. The dependence of the gain on the hydrogen pressure was found. It was found that a approx.50% efficiency of conversion into just the first Stokes component could be acheived without any special measures to suppress the second component.