Beyond nonlinear saturation of backward Raman amplifiers

Journal Article · 27 June 2016 · Physical Review E

DOI: https://doi.org/10.1103/PhysRevE.93.063210 · OSTI ID:1305352

Barth, Ido  ^[1]; Toroker, Zeev ^[2]; Balakin, Alexey A. ^[3]; Fisch, Nathaniel J.  ^[4]

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1. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
2. Technion Israel Inst. of Technology, Haifa (Israel)
3. Inst. of Applied Physics RAS, Nizhnii Novgorod (Russia)
4. Princeton Univ., NJ (United States). Dept. of Astrophysical Sciences

Backward Raman amplification is limited by relativistic nonlinear dephasing resulting in saturation of the leading spike of the amplified pulse. We employed pump detuning in order to mitigate the relativistic phase mismatch and to overcome the associated saturation. In an amplified pulse can then be reshaped into a monospike pulse with little precursory power ahead of it, with the maximum intensity increasing by a factor of two. Finally, this detuning can be employed advantageously both in regimes where the group velocity dispersion is unimportant and where the dispersion is important but small.

• Research Organization: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: NA0002948; FA9550-15-1-0391; AC02-09CH11466; HDTRA1-11-1-0037; 15-32-20641
• OSTI ID: 1305352
• Alternate ID(s): OSTI ID: 1259580
• Journal Information: Physical Review E, Vol. 93, Issue 6; ISSN 2470-0045
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English