Beam cleaning of an incoherent laser via plasma Raman amplification

Matthew R. Edwards, Kenan Qu, Julia M. Mikhailova, Nathaniel J. Fisch

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


We show that backward Raman amplification in plasma can efficiently compress a temporally incoherent pump laser into an intense coherent amplified seed pulse, provided that the correlation time of the pump is longer than the inverse plasma frequency. An analytical theory for Raman amplification using pump beams with different correlation functions is developed and compared to numerical calculations and particle-in-cell simulations. Since incoherence on scales shorter than the instability growth time suppresses spontaneous noise amplification, we point out a broad regime where quasi-coherent sources may be used as efficient low-noise Raman amplification pumps. As the amplified seed is coherent, Raman amplification additionally provides a beam-cleaning mechanism for removing incoherence. At near-infrared wavelengths, finite coherence times as short as 50 fs allow amplification with only minor losses in efficiency.

Original languageEnglish (US)
Article number103110
JournalPhysics of Plasmas
Issue number10
StatePublished - Oct 1 2017

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics


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