Abstract
We analyzed, designed and fabricated a U-type resonator for intra-cavity frequency doubling of a diode-side-pumped Q-switched Nd:YAG rod laser with high power and high stability for surgery of prostatic tissue. The resonator stability conditions were analyzed graphically in the various configurations for a U-type resonator. We obtained green light at 532nm using a single KTP crystal, with average output power of 151W at 10kHz repetition rate, and with 113ns pulse duration at 810W input pump power. We achieved 1064–532nm conversion efficiency of 75.8%, and pump-to-green optical–optical efficiency of 18.6%. The green power fluctuation was ±1.0% and pointing stability was better than 4μrad. The green laser output was coupled to a side-firing medical fiber to transfer the laser beam to the prostatic tissue.
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