Optical phase conjugation in backward Raman amplification

Qing Jia, Kenan Qu, Nathaniel J. Fisch

Research output: Contribution to journalArticle

Abstract

Compression of an intense laser pulse using backward Raman amplification (BRA) in plasma, followed by vacuum focusing to a small spot size, can produce unprecedented ultrarelativistic laser intensities. The plasma density inhomogeneity during BRA, however, causes laser phase and amplitude distortions, limiting the pulse focusability. To solve the issue of distortion, we investigate the use of optical phase conjugation as the seed pulse for BRA. We show that the phase conjugated laser pulses can retain focusability in the nonlinear pump depletion regime of BRA, but not so easily in the linear amplification regime. This somewhat counterintuitive result is because the nonlinear pump depletion regime features a shorter amplification distance, and hence less phase distortion due to wave–wave interaction, than the linear amplification regime.

Original languageEnglish (US)
Pages (from-to)5254-5257
Number of pages4
JournalOptics Letters
Volume45
Issue number18
DOIs
StatePublished - Sep 15 2020

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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