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Title: Particle-in-cell Simulations of Raman Laser Amplification in Ionizing Plasmas

Abstract

By using the amplifying laser pulse in a plasma-based backward Raman laser amplifier to generate the plasma by photo-ionization of a gas simultaneous with the amplification process, possible instabilities of the pumping laser pulse can be avoided. Particle-in-cell simulations are used to study this amplification mechanism, and earlier results using more elementary models of the Raman interaction are verified [D.S. Clark and N.J. Fisch, Phys. Plasmas, 9 (6): 2772-2780, 2002]. The effects (unique to amplification in ionizing plasmas and not included in previous simulations) of blue-shifting of the pump and seed laser pulses and the generation of a wake are observed not significantly to impact the amplification process. As expected theoretically, the peak output intensity is found to be limited to I {approx} 10{sup 17} W/cm{sup 2} by forward Raman scattering of the amplifying seed. The integrity of the ionization front of the seed pulse against the development of a possible transverse modulation instability is also demonstrated.

Authors:
;
Publication Date:
Research Org.:
Princeton Plasma Physics Lab., NJ (US)
Sponsoring Org.:
USDOE Office of Science (SC) (US)
OSTI Identifier:
814693
Report Number(s):
PPPL-3829
TRN: US0304313
DOE Contract Number:  
AC02-76CH03073
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 27 Jun 2003
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLIFICATION; AMPLIFIERS; INSTABILITY; IONIZATION; LASERS; MODULATION; PLASMA; PUMPING; SCATTERING; SEEDS; COMPUTER SIMULATION; LASER-PLASMA INTERACTIONS

Citation Formats

Clark, Daniel S, and Fisch, Nathaniel J. Particle-in-cell Simulations of Raman Laser Amplification in Ionizing Plasmas. United States: N. p., 2003. Web. doi:10.2172/814693.
Clark, Daniel S, & Fisch, Nathaniel J. Particle-in-cell Simulations of Raman Laser Amplification in Ionizing Plasmas. United States. https://doi.org/10.2172/814693
Clark, Daniel S, and Fisch, Nathaniel J. Fri . "Particle-in-cell Simulations of Raman Laser Amplification in Ionizing Plasmas". United States. https://doi.org/10.2172/814693. https://www.osti.gov/servlets/purl/814693.
@article{osti_814693,
title = {Particle-in-cell Simulations of Raman Laser Amplification in Ionizing Plasmas},
author = {Clark, Daniel S and Fisch, Nathaniel J},
abstractNote = {By using the amplifying laser pulse in a plasma-based backward Raman laser amplifier to generate the plasma by photo-ionization of a gas simultaneous with the amplification process, possible instabilities of the pumping laser pulse can be avoided. Particle-in-cell simulations are used to study this amplification mechanism, and earlier results using more elementary models of the Raman interaction are verified [D.S. Clark and N.J. Fisch, Phys. Plasmas, 9 (6): 2772-2780, 2002]. The effects (unique to amplification in ionizing plasmas and not included in previous simulations) of blue-shifting of the pump and seed laser pulses and the generation of a wake are observed not significantly to impact the amplification process. As expected theoretically, the peak output intensity is found to be limited to I {approx} 10{sup 17} W/cm{sup 2} by forward Raman scattering of the amplifying seed. The integrity of the ionization front of the seed pulse against the development of a possible transverse modulation instability is also demonstrated.},
doi = {10.2172/814693},
url = {https://www.osti.gov/biblio/814693}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2003},
month = {6}
}