Zhenxu Bai

High-quality near-field beam achieved in a high-power laser based on SLM adaptive beam-shaping system

We demonstrate a high-power laser system with a high-quality near-field beam by using a liquid-crystal spatial light modulator (SLM). An efficient spatial beam shaping algorithm is discussed which can improve the output nearfield beam quality effectively. Both small-signal and large-signal amplification situation of the laser are considered in the beam shaping algorithm. The experimental results show that the near field fluence modulation of output is improved from 1.99:1 to 1.26:1 by using the liquid-crystal SLM. Obvious uniform spatial fluence distribution and near-field beam quality improvement are observed.

Tail modulation suppression in the process of high-energy stimulated Brillouin scattering pulse compression

We report that the tail modulation of Stokes pulses in the high-energy stimulated Brillouin scattering pulse compression can be suppressed by controlling effective pulse width of the pump. It is shown through numerical simulations and validated experimentally that the effective pulse width is an appropriate parameter, which determines the generation of tail modulation. The effective pulse width broaden as the increase of energy. This mechanism leads to the amplification of Stokes tail edge and it is the cause of tail modulation.

High Energy, High Compact Single Frequency Hundred Picoseconds Laser Based on Stimulated Brillouin Scattering Pulse Compression

A compact hundred picoseconds laser was demonstrated based on stimulated Brillouin scattering (SBS) pulse compression. Maximum energy 420 mJ with compressed pulse width 430 ps was achieved, corresponding to peak power of ~1 GW.

A promotion of stability for temporal compression based on SBS in an interferometric scheme

Abstract An approach that introducing a standing wave into focal area to stabilize the output energy and duration of stimulated Brillouin scattering (SBS) compression is presented. An interferometric scheme filled with FC-770 is used to improve the stability of both output energy and duration two times compared with an equivalent conventional SBS compressor. Moreover, the interferometric scheme shows a promotion for the performance of SBS compression.

Fluctuation initiation of Stokes signal and its effect on stimulated Brillouin scattering pulse compression

In this paper, a theoretical model is developed to demonstrate that fluctuations in the Stokes signal and occurrence position contribute to the final compression ratio in stimulated Brillouin scattering (SBS). This theoretical analysis can be applied to the investigation of the temporal characteristics of SBS pulse compression. This model agrees well with the experimental results in a two-stage SBS compressor.