Intra-cavity harmonic generation in diode-pumped Q-switched Nd:YAG rod lasers is a preferred architecture to generate
high output power at 532nm and 355nm in multimode operation. We have developed a side-pumped, dual rod Nd:YAG
laser with intra-cavity second harmonic generation using Type II LBO in a double-pass configuration. A maximum
532nm output power of 420 W was achieved at 10 kHz with an M^2 of about 24. The pulse duration was 70 ns with a
pulse energy stability of less than 0.7% rms. By incorporating a novel birefringence compensation technique and adding
a Type II LBO sum frequency generator, we attained 160W of 355nm output at a repetition rate of 8 kHz with an M^2 of
18 and a pulse duration of 45 ns.
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