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Ultrahigh peak power lasers are important scientific tools for frontierlaser-physics researches, in which both the peak power improvement andoperating safety are very important meanwhile limited by the damage thresholdand size of compression gratings currently. Based on a recent reported method"multistep pulse compressor (MPC)", a multistage smoothing based MPC (MS-MPC)is proposed here to further improve the running safety, operating convenience,and simplify the whole setup of the MPC. In this optimized design, the beamsmoothing is not simply executed in the pre-compressor or main-compressor, butseparated into multistage. Then, it can protect important optics in every stagedirectly and reduce the executing difficult of typical MPC at the same time.The prism pair based pre-compressor will induce suitable spatial dispersionwhich is easier to be achieved and enough to protect the first gratingdirectly. At the same time, the asymmetric four-grating compressor (AFGC) willalso induce spatial dispersion to further smooth the laser beam which helps toprotect the last grating directly. In this way, 10s-100s PW lasers can becompressed by using current available optics with improved operating safetyowing to remove random spatial intensity modulations. Furthermore, anadditional beam smoothing stage can be added before the main amplifier toprotect the biggest amplification crystal away from damage. This MS-MPC opticaldesign can be easily extended to be used in all exist PW laser facilities toimprove their potential compressed pulse energy and running safety.

Multistage smoothing based multistep pulse compressor for ultrahigh peak power lasers