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This paper studies the excitation of the stimulated Raman backscatter of ultrashort and ultrahigh intensity laser pulse. Through one dimensional particle-in-cell code LPIC++, it is found that in the relativistic condition, the stimulated Raman backscatter is not in the normal mode but strongly coupled. The frequency spectra become broad with blueshift and the interval between the peaks are greater than the frequency of the plasma wave frequency. These results are consistent with the prediction of a strongly coupled Raman theory.

Type

Journal article

Journal

Qiangjiguang Yu Lizishu/High Power Laser and Particle Beams

Publication Date

01/01/2008

Volume

20

Pages

79 - 82