We are developing plasma x-ray lasers pumped by ultra-short pulse lasers and have concentrated our efforts on developing a silver x-ray laser (1,3.9 run) with spatially full coherence by means of a double target method,. Recently, we have succeeded in developing a unique new pumping laser system, which is a CPA laser consisting of OPCPA and zigzag-slab type glass amplifiers,. The OPCPA was adopted for improving the controllability of pumping pulses instead of a regenerative amplifier and the zigzag-slab amplifiers were adopted for increasing the repetition rate.
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