Control of Stimulated Raman Scattering in the Strongly Nonlinear and Kinetic Regime Using Spike Trains of Uneven Duration and Delay: STUD Pulses

TL;DR

This paper introduces STUD pulses, a technique involving deterministic temporal modulation and spatial scrambling, which significantly reduces stimulated Raman scattering in nonlinear plasma regimes, outperforming traditional methods.

Contribution

The paper presents a novel method called STUD pulses that effectively control SRS in nonlinear regimes through deterministic modulation and spatial scrambling.

Findings

STUD pulses decrease SRS reflectivity by over an order of magnitude.

Simulations show improved control over SRS compared to RPP and ISI beams.

Technique is effective in strongly nonlinear, kinetic plasma regimes.

Abstract

Stimulated Raman scattering (SRS) in its strongly nonlinear, kinetic regime is controlled by a technique of deterministic, strong temporal modulation and spatial scrambling of laser speckle patterns, called Spike Trains of Uneven Duration and Delay (STUD pulses) [B. Afeyan and S. H\"uller, Phys. Rev. Lett. (submitted)]. Kinetic simulations show that use of STUD pulses may decrease SRS reflectivity by more than an order of magnitude over random-phase-plate (RPP) or induced-spatial-incoherence (ISI) beams of the same average intensity and comparable bandwidth.