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Title: An ultra-high gain and efficient amplifier based on Raman amplification in plasma

Raman amplification arising from the excitation of a density echelon in plasma could lead to amplifiers that significantly exceed current power limits of conventional laser media. Here we show that 1–100 J pump pulses can amplify picojoule seed pulses to nearly joule level. The extremely high gain also leads to significant amplification of backscattered radiation from “noise”, arising from stochastic plasma fluctuations that competes with externally injected seed pulses, which are amplified to similar levels at the highest pump energies. The pump energy is scattered into the seed at an oblique angle with 14 J sr -1, and net gains of more than eight orders of magnitude. The maximum gain coefficient, of 180 cm -1, exceeds high-power solid-state amplifying media by orders of magnitude. The observation of a minimum of 640 J sr -1 directly backscattered from noise, corresponding to ≈10% of the pump energy in the observation solid angle, implies potential overall efficiencies greater than 10%.
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  1. Univ. of Strathclyde, Glasgow, Scotland (United Kingdom); Academy of Sciences of the Czech Republic (ASCR), Prague (Czech Republic)
  2. Univ. of Strathclyde, Glasgow, Scotland (United Kingdom)
  3. Univ. of Lisbon (Portugal)
  4. Univ. of Strathclyde, Glasgow, Scotland (United Kingdom); National Inst. for Physics and Nuclear Engineering, Bucharest (Romania)
  5. Ulsan National Inst. of Science and Technology (UNIST) (Korea, Republic of)
  6. Heinrich Heine Univ. Dusseldorf (HHU) (Germany)
  7. Rutherford Appleton Lab., Didcot (United Kingdom)
  8. Queen's Univ., Belfast, Northern Ireland (United Kingdom)
Publication Date:
Report Number(s):
Journal ID: ISSN 2045-2322
Grant/Contract Number:
AC52-07NA27344; EP/N028694/1; EP/I029206/1; H2020 EC-GA 654148; CZ.02.1.01/0.0/0.0/15_008/0000162
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2045-2322
Nature Publishing Group
Research Org:
Univ. of Strathclyde, Glasgow, Scotland (United Kingdom); Heinrich Heine Univ. Dusseldorf (HHU) (Germany); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE; Engineering and Physical Sciences Research Council (EPSRC); European Commission (EC); German Federal Ministry of Education and Research (BMBF); German Research Foundation (DFG)
Country of Publication:
United States
42 ENGINEERING; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; laser-produced plasmas; nonlinear optics
OSTI Identifier: