PMID: 15244751Jul 13, 2004Paper

Pump side scattering in ultrapowerful backward Raman amplifiers

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
A SolodovN J Fisch

Abstract

Extremely large laser power might be obtained by compressing laser pulses through backward Raman amplification (BRA) in plasmas. Premature Raman backscattering of a laser pump by plasma noise might be suppressed by an appropriate detuning of the Raman resonance, even as the desired amplification of the seed persists with a high efficiency. In this paper we analyze side scattering of laser pumps by plasma noise in backward Raman amplifiers. Though its growth rate is smaller than that of backscattering, the side scattering can nevertheless be dangerous, because of a longer path of side-scattered pulses in plasmas and because of an angular dependence of the Raman resonance detuning. We show that side scattering of laser pumps by plasma noise in BRA might be suppressed to a tolerable level at all angles by an appropriate combination of two detuning mechanisms associated with plasma density gradient and pump chirp.

References

Oct 4, 2000·Physical Review Letters·V M MalkinN J Fisch
Nov 1, 2000·Physical Review Letters·V M MalkinN J Fisch

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Citations

Jan 24, 2015·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·V M MalkinN J Fisch
Jul 15, 2016·Physical Review. E·Ido BarthNathaniel J Fisch

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