11 October 2005 Eye-safe intracavity pumped KTP OPO
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The efficient, eye-safe, high repetition rate, intracavity optical parametric oscillator (IOPO) inside acousto-optic Q-switched Nd:YVO4 laser end pumped by 15-W fiber coupled diode was demonstrated. The pumping Q-switched laser gives 3-W average output power at 1064-nm wavelength and 40-kHz repetition rate. The additional separating mirror, 'x-cut' KTP crystal and the output coupler, highly reflective at 1064-nm and partially transparent at 1572-nm wavelength, form flat-flat IOPO resonator of 35-mm length. We have achieved 3-ns duration pulses for 20-mm long KTP and 4-ns duration pulses for 30-mm KTP length, respectively. Above 10-kW peak power pulses with the average power of 1.5 W at the signal wavelength for 40 kHz repetition rate were demonstrated. Due to intracavity gain guiding effect, diffraction limited signal beam was achieved. Conversion efficiency of 50% with respect to Q-switched output at 1064-nm wavelength and 11% with respect to diode pump power were achieved.
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Waldemar Żendzian, Waldemar Żendzian, Jan K. Jabczyński, Jan K. Jabczyński, Jacek Kwiatkowski, Jacek Kwiatkowski, Przemysław Wachulak, Przemysław Wachulak, } "Eye-safe intracavity pumped KTP OPO", Proc. SPIE 5958, Lasers and Applications, 595822 (11 October 2005); doi: 10.1117/12.620603; https://doi.org/10.1117/12.620603

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