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

Journal Article · · Scientific Reports
ORCiD logo [1];  [2];  [2];  [3];  [2];  [4];  [2];  [5];  [2];  [2];  [2];  [2];  [2];  [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [6];  [2];  [2];  [2] more »;  [7];  [8];  [8];  [6];  [3];  [2] « less
  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)

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
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

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Cited By (10)

Spatiotemporal control of laser intensity journal March 2018
High-Energy, Short-Duration Bursts of Coherent Terahertz Radiation from an Embedded Plasma Dipole journal January 2018
Flying focus: Spatial and temporal control of intensity for laser-based applications journal March 2019
Stimulated Raman backscattering amplification with a low-intensity pump journal October 2019
Flying focus and its application to plasma-based laser amplifiers journal November 2018
Investigation of picosecond thermodynamics in a laser-produced plasma using Thomson scattering journal October 2019
Towards a high efficiency amplifier based on Raman amplification journal November 2019
Petawatt and exawatt class lasers worldwide text January 2019
Petawatt and exawatt class lasers worldwide journal January 2019
Petawatt and exawatt class lasers worldwide text January 2019

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