Advantages to a diverging Raman amplifier

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Sadler, James D. and Silva, Luís O. and Fonseca, Ricardo A. and Glize, Kevin and Kasim, Muhammad F. and Savin, Alex and Aboushelbaya, Ramy and Mayr, Marko W. and Spiers, Benjamin and Wang, Robin H. W. and Bingham, Robert and Trines, Raoul M. G. M. and Norreys, Peter A. (2018) Advantages to a diverging Raman amplifier. Communications Physics, 1 (1). 19. ISSN 2399-3650 (https://doi.org/10.1038/s42005-018-0021-8)

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Abstract

The plasma Raman instability can efficiently compress a nanosecond long high-power laser pulse to sub-picosecond duration. Although, many authors envisaged a converging beam geometry for Raman amplification, here we propose the exact opposite geometry; the amplification should start at the intense focus of the seed. We generalise the coupled laser envelope equations to include this non-collimated case. The new geometry completely eradicates the usual trailing secondary peaks of the output pulse, which typically lower the efficiency by half. It also reduces, by orders of magnitude, the initial seed pulse energy required for efficient operation. As in the collimated case, the evolution is self similar, although the temporal pulse envelope is different. A two-dimensional particle-in-cell simulation demonstrates efficient amplification of a diverging seed with only 0.3 mJ energy. The pulse has no secondary peaks and almost constant intensity as it amplifies and diverges.

ORCID iDs

Sadler, James D., Silva, Luís O., Fonseca, Ricardo A., Glize, Kevin, Kasim, Muhammad F., Savin, Alex, Aboushelbaya, Ramy, Mayr, Marko W., Spiers, Benjamin, Wang, Robin H. W., Bingham, Robert ORCID logoORCID: https://orcid.org/0000-0002-9843-7635, Trines, Raoul M. G. M. and Norreys, Peter A.;
  • Item type:Article
    ID code:64181
    Dates:
    Date
    Event
    17 May 2018
    Published
    19 April 2018
    Accepted
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Depositing user: Pure Administrator
    Date deposited:30 May 2018 11:29
    Last modified:11 Nov 2024 12:00
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/64181
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