Optimized window to produce ultra-intense and ultra-compressed laser pulses by Stimulated Brillouin Scattering

Abstract

We propose a theoretical model to produce ultra-intense and ultra-compressed laser pulses based on Stimulated Brillouin Scattering (SBS) process. The amplification of laser pulses via Brillouin amplification process is obtained when three waves (two transverse electromagnetic waves and a longitudinal plasma wave) couple in the plasma when resonance condition for energy (frequency ω) and momentum (wave-vector k) is satisfied. Counter propagating seed pulse takes energy from laser pulse when they interact with each other via the process of stimulated Brillouin scattering and finally it gets amplified and compressed. We optimize the parameters (like initial plasma density, initial laser pulse intensity, interaction time, wave breaking time, fillamentation time etc.) for SBS compression and amplification to obtain high intensity laser pulse. This optimized window exactly match with the simulation results reported by Weber et al. [1]. Due to strong SBS within the optimum parametric window, one can develop compact plasma-based amplifier, which can produce high intensity short laser pulse. This technique offers damage less amplification of laser pulses. The amplification and compression ratio obtained in this model are 94 and 30, respectively. These intensities can be used as seed intensities to obtain Zetta watt laser pulses using C-3 (Cascade, Conversion and Compression) technique reported by Mourou et al. [2].