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Ultra-short ultra-intense laser provides unprecedented experimental tools andextreme physical conditions to explore frontier secrets of nature. Recently,multistep pulse compressor (MPC) was proposed to break through the limitationof the size and damage threshold of the grating in the compressor during therealization of higher peak power laser. In the MPC methods, beam smoothing inthe pre-compressor is a very important process. Here, beam smoothing based onprism pair were studied technically, in which both the spatial profiles and thespectral dispersive properties were analyzed in detail. The simulation resultsshow clearly that the prism pair can effectively smooth the laser beam.Furthermore, the beam smoothing is much more efficiency with shorter separateddistance if two prism pairs are arranged to induce spatial dispersion at onedirection or two directions. The results of beam smoothing here will help theoptimized optical designs in all PW laser systems to improve their output andrunning safety.

Beam smoothing based on prism pair for multistep pulse compressor in PW lasers