Raman compression of laser pulses without frequency modulation in plasma created in front of the seed pulse

The possibility of suppressing effectively parasitic Raman amplification of plasma noise by creating a plasma in front of the seed pulse is studied. Such plasma can be created by injecting an additional ionizing laser pulse co-directionally with seed one and slightly ahead of it. It is shown that th...

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Veröffentlicht in:Physics of plasmas 2020-05, Vol.27 (5)
Hauptverfasser: Balakin, A. A., Fraiman, G. M., Levin, D. S., Skobelev, S. A.
Format: Artikel
Sprache:eng
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Zusammenfassung:The possibility of suppressing effectively parasitic Raman amplification of plasma noise by creating a plasma in front of the seed pulse is studied. Such plasma can be created by injecting an additional ionizing laser pulse co-directionally with seed one and slightly ahead of it. It is shown that the efficiency of Raman amplification and compression will be high (about 80% of pump energy), if a delay between the ionization front and the seed laser pulse is less than or equal to two inverse increments of the Raman amplification. This conclusion is valid for both high and low plasma densities, when the nonlinear frequency shift due to the nonlinear dispersion of the plasma wave is significant. This result is confirmed by three-dimensional numerical simulations.
ISSN:1070-664X
1089-7674
DOI:10.1063/5.0001858