Controlling the optical limiting shape in stimulated Brillouin scattering by dye absorption

Abstract

On the basis of computing models of stimulated Brillouin scattering (SBS), the optical limiting response characteristics in SBS process are investigated theorctieally. Dependence of limiting parameter ——residual energy on pump parameters (input power density, pulse duration), medium parameters (gain, phonon life time) and configuration parameters (focusing length, cell length) are analyzed. Response characteristics of SBS limiting are given by studying the variation of delay time, residual peak power and residual energy. Ideal response system can be obtained by choosing a medium with larger gain and shorter phonon life time. But the vesidual energy could not be got rid of by choosing SBS medium parameters only. In experiment, we obtained flat-roofed optical limiting pulse shapes in SBS process using dye absorption.

Investigation on the effect of beam divergence angle upon output waveform based on stimulated Brillouin scattering optical limiting

“…[11−13] In Refs. [14]- [17], several proposals, including double SBS optical limiting, one-time SBS optical limiting adopting short pump wavelength or short phonon-lifetime medium, and inserting a dye plate after SBS optical limiting, have been presented to realize flat-top waveforms. All these themes facilitate the application of a flat-top waveform in the time domain.…”