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3 April 2000 Long-time operation of a 100-W green average-power two-rod double-pass Nd:YAG MOPA system
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Proceedings Volume 3889, Advanced High-Power Lasers; (2000)
Event: Advanced High-Power Lasers and Applications, 1999, Osaka, Japan
A diode pumped Nd:YAG rod master-oscillator power-amplifier system that delivers 220 W average power in a near top-hat beam distribution has been developed. The repetition rate is 2.5 kHz (25% duty cycle) and the pulse width is approximately 50 ns. With a two-stage KTP crystal 131 W green average power was obtained at frequency-conversion efficiency as high as 65.2%. The system was continuously operated 100 hours starting with an initial green power of 106 W. As the experiments finished the green power was 97.4 W. The decrease in green power, which was mainly attributed to the gray tracing effect in KTP, was characterized by a slope of 0.07-%/hour. The amplifier heads incorporate new concepts for both the pump cavity and the pump source to cavity transport line. Thereby the results of which were an efficient absorption of the pumped light in the media and homogeneous pumped-beam distribution under various pump-power levels, Nd:YAG active media of different radii and concentration and shifts of the diode wavelength resulted.
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Shuhei Yamamoto, Yasuharu Koyata, Nicolaie Pavel, and Yoshihito Hirano "Long-time operation of a 100-W green average-power two-rod double-pass Nd:YAG MOPA system", Proc. SPIE 3889, Advanced High-Power Lasers, (3 April 2000);


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