582 / 2019-03-20 21:56:13

Rescatter of Stimulated Raman Scattering Amplification of a secondary SRS light in a pico-second laser plasma instability scenario

Stimulated Raman Scattering,rescattering

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We present particle-in-cell (PIC) simulations for laser plasma instabilities (LPI) with the laser pulse duration of a few pico seconds. The simulation parameters are relevant to LPI experimental conditions on SG-II. It is found that when the incident laser intensity is well above its SRS threshold, the back-scattered light via SRS can also excite secondary SRS. The daughter light wave via the secondary SRS can be amplified on its way propagating towards the higher density region in the bath of broadband lights generated through the primary backward SRS process. This amplification process reduces the intensities of primary backward SRS lights thus may cause an underestimation of SRS level. Absolute modes of secondary SRS are also observed but they are not energetically important.