Optical phase conjugation in backward Raman amplification

Jia, Qing; Qu, Kenan; Fisch, Nathaniel J.

doi:10.1364/OL.397321

Optical phase conjugation in backward Raman amplification

Journal Article · Mon Sep 14 00:00:00 EDT 2020 · Optics Letters

DOI:https://doi.org/10.1364/OL.397321· OSTI ID:1660314

Jia, Qing; ; Fisch, Nathaniel J.

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.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0002948; NA0003871

OSTI ID:: 1660314

Alternate ID(s):: OSTI ID: 1801144

Journal Information:: Optics Letters, Journal Name: Optics Letters Journal Issue: 18 Vol. 45; ISSN 0146-9592; ISSN OPLEDP

Publisher:: Optical Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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