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Title: A robust plasma-based laser amplifier via stimulated Brillouin scattering

Journal Article · · Plasma Physics and Controlled Fusion
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [4]; ORCiD logo [5];  [6]; ORCiD logo [7]; ORCiD logo [7]
  1. Univ. of Lisbon (Portugal); Univ. of California, Los Angeles, CA (United States)
  2. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab. (RAL)
  3. Univ. of Strathclyde, Glasgow, Scotland (United Kingdom)
  4. Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Rutherford Appleton Lab. (RAL); Univ. of Strathclyde, Glasgow, Scotland (United Kingdom)
  5. Univ. of St. Andrews, Scotland (United Kingdom)
  6. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  7. Univ. of Lisbon (Portugal)

Brillouin amplification in plasma is more resilient to fluctuations in the laser and plasma parameters than Raman amplification, making it an attractive alternative to Raman amplification. In this work, we focus on high plasma densities, n0 > ncr/4, where stimulated Raman scattering is not possible and laser beam filamentation is the dominant competing process. Through analytic theory and multi-dimensional particle-in-cell simulations, we identify a parameter regime for which Brillouin amplification can be efficient while maintaining filamentation of the probe at a controlled level. We demonstrate pump-to-probe compression ratios of up to 72 and peak amplified probe fluences over 1 kJ cm-2 with ≃50% efficiency. High pulse quality is maintained through control of parasitic filamentation, enabling operation at large beam diameters. Provided the pump and probe pulse diameters can be increased to 1 mm, our results suggest that Brillouin amplification can be used to produce sub-picosecond pulses of petawatt power.

Research Organization:
SLAC National Accelerator Lab., Menlo Park, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); Science and Technology Facilities Council (STFC); Engineering and Physical Sciences Research Council (EPSRC); European Research Council (ERC)
Grant/Contract Number:
AC02-76SF00515; 167841; SFRH/BD/75558/2010; 695088
OSTI ID:
1868544
Journal Information:
Plasma Physics and Controlled Fusion, Vol. 63, Issue 11; ISSN 0741-3335
Publisher:
IOP ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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