Boosting the performance of Brillouin amplification at sub-quarter-critical densities via reduction of parasitic Raman scattering
- Science and Technology Facilities Council (STFC), Didcot (United Kingdom). Rutherford Appleton Lab. (RAL)
- Univ. of Lisbon (Portugal); Univ. of California, Los Angeles, CA (United States)
- Univ. of Strathclyde, Glasgow, Scotland (United Kingdom)
- Science and Technology Facilities Council (STFC), Didcot (United Kingdom). Rutherford Appleton Lab. (RAL); Univ. of Strathclyde, Glasgow, Scotland (United Kingdom)
- Univ. of St. Andrews, Scotland (United Kingdom)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Univ. of Lisbon (Portugal)
Brillouin amplification of laser pulses in plasma has been shown to be a promising approach to produce picosecond pulses of petawatt power. A key challenge is preservation of the quality of the amplified pulse, which requires control of parasitic instabilities that accompany the amplification process. At high plasma densities (>cr/4), ponderomotive filamentation has been identified as the biggest threat to the integrity of the amplifying pulse. It has therefore been proposed to perform Brillouin scattering at densities below ncr/4 to reduce the influence of filamentation. However, parasitic Raman scattering can become a problem at such densities, contrary to densities above ncr/4 where it is forbidden. In this paper, we investigate the influence of parasitic Raman scattering on Brillouin amplification at densities below ncr/4. We expose the specific problems posed by both Raman backward and forward scattering, and how both types of scattering can be mitigated, leading to an increased performance of the Brillouin amplification process.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Engineering and Physical Sciences Research Council (EPSRC); European Research Council (ERC)
- Grant/Contract Number:
- AC02-76SF00515; EP/G04239X/1; 695088
- OSTI ID:
- 1867893
- Journal Information:
- Plasma Physics and Controlled Fusion, Vol. 63, Issue 12; ISSN 0741-3335
- Publisher:
- IOP ScienceCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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