An ultra-high gain and efficient amplifier based on Raman amplification in plasma
- Univ. of Strathclyde, Glasgow, Scotland (United Kingdom); Academy of Sciences of the Czech Republic (ASCR), Prague (Czech Republic)
- Univ. of Strathclyde, Glasgow, Scotland (United Kingdom)
- Univ. of Lisbon (Portugal)
- Univ. of Strathclyde, Glasgow, Scotland (United Kingdom); National Inst. for Physics and Nuclear Engineering, Bucharest (Romania)
- Ulsan National Inst. of Science and Technology (UNIST) (Korea, Republic of)
- Heinrich Heine Univ. Dusseldorf (HHU) (Germany)
- Rutherford Appleton Lab., Didcot (United Kingdom)
- Queen's Univ., Belfast, Northern Ireland (United Kingdom)
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%.
- Research Organization:
- Univ. of Strathclyde, Glasgow, Scotland (United Kingdom); Heinrich Heine Univ. Dusseldorf (HHU) (Germany); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Sponsoring Organization:
- USDOE; Engineering and Physical Sciences Research Council (EPSRC); European Commission (EC); German Federal Ministry of Education and Research (BMBF); German Research Foundation (DFG)
- 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
- OSTI ID:
- 1389974
- Report Number(s):
- LLNL-JRNL-729352
- Journal Information:
- Scientific Reports, Vol. 7; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Similar Records
Timing resolution and rate capability of Photonis miniPlanacon XPM85212/A1-S MCP-PMT
Time-Resolved XUV Opacity Measurements of Warm Dense Aluminum