Multi-frequency Raman amplifiers

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 (PIC) 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.

arXiv comment7 pages, 6 figures, submitted to Phys. Rev. E

References in corpus (10)

• Backward Raman amplification in the Langmuir wavebreaking regime
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Cited by in corpus (2)

• Enhanced strong-coupling stimulated Brillouin amplification assisted by Raman amplification
• Optical phase conjugation in backward Raman amplification