We have demonstrated a cryogenically cooled Q-switched Yb:YAG laser oscillator in a diode pump. A high average power of 74 W was obtained with a pulse energy of several mJ. The optical–optical efficiency was as high as 60%. The spatial beam profile was excellent at M 2<1.4 with no additional compensation optics.
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Tokita et al. (2005) studied this question.
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