Method for optimizing output in ultrashort-pulse multipass laser amplifiers with selective use of a spectral filter

摘要

A method for optimizing multipass laser amplifier (100) output (134) utilizes a spectral filter (122) in early passes (128) but not in later passes (126). The pulses shift position slightly for each pass through the amplifier, and the filter is placed such that early passes intersect the filter while later passes bypass it. The filter position may be adjusted offline in order to adjust the number of passes in each category. The filter may be optimized for use in a cryogenic (112) amplifier