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Multifrequency Raman amplifiers

Ido Barth1,2,* and Nathaniel J. Fisch2

  • 1Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
  • 2Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08544, USA

  • *ido.barth@mail.huji.ac.il
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Phys. Rev. E 97, 033201 – Published 8 March, 2018

DOI: https://doi.org/10.1103/PhysRevE.97.033201

Abstract

In its usual implementation, the Raman amplifier features only one pump carrier frequency. However, pulses with well-separated frequencies can also be Raman amplified while compressed in time. Amplification with frequency-separated pumps is shown to hold even in the highly nonlinear, pump-depletion regime, as derived through a fluid model, and demonstrated via particle-in-cell simulations. The resulting efficiency is similar to single-frequency amplifiers, but, due to the beat-wave waveform of both the pump lasers and the amplified seed pulses, these amplifiers feature higher seed intensities with a shorter spike duration. Advantageously, these amplifiers also suffer less noise backscattering, because the total fluence is split between the different spectral components.

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Phys. Rev. E 97, 033201– Published 8 March, 2018
  • Received 8 December 2017
Article part of CHORUS
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