Output characteristics of high-power stimulated Brillouin scattering pulse compression enhanced by thermal effects based on HT270

Abstract

Thermal effects are typically considered as obstacles to high-repetition rate stimulated Brillouin scattering (SBS) pulse compression. In this paper, a novel method is proposed for improving the SBS output characteristics by exploiting thermal effects on the liquid medium. Using HT270, the SBS output parameters with the medium purification and rotating off-centered lens methods are studied at different repetition rates. The results indicate that these two methods can alleviate thermal effects and improve the energy efficiency, but the rotating method reduces the energy stability because of the aggravated optical breakdown at the kilohertz-level repetition rate. For a 35-mJ pump energy, the energy efficiency at 2 kHz without the rotating method is 30% higher than that at 100 Hz and 70% higher than that at 500 Hz. The enhancement of the SBS output characteristics by thermal effects is demonstrated theoretically and experimentally, and 2-kHz high-power SBS pulse compression is achieved with HT270.

Wavefront‐Reversal, Low‐Threshold, and Enhanced Stimulated Brillouin Scattering for Arbitrary Structured Light

“…The SBS configuration has been used in high-power laser systems to compress pulses and correct distorted wavefronts caused by thermal effects or a turbulent atmosphere. [4][5][6][7][8] The other system is a double-ended SBS amplifier. In this scheme, both the pump and Stokes fields are applied externally.…”

Characteristics and suppression of beam distortion in a high repetition rate nanosecond stimulated Brillouin scattering phase conjugation mirror

“…The inherent phase conjugation, amplification and slight frequency shift features of SBS enable stimulated Brillouin scattering phase conjugation mirrors (SBS-PCMs) to correct beam aberrations with high conversion efficiency [13][14][15] . Particularly in the field of high-energy lasers, liquid media have been widely adopted for SBS-PCMs and amplifiers due to their ability to handle high-energy loads, offer high gains and enable flexible media cell designs [8,[16][17][18][19][20] .…”