26 January 2005 Phase mismatch compensation of second harmonic generation with controlling boundary temperature of type-II KTP crystal in high-power green laser
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Abstract
We reported phase mismatch compensation of second harmonic generation with controlling boundary temperature of type-II KTP crystal in high power intracavity frequency-doubled Nd:AG laser. Thermal induced phase mismatching of the KTP crystal was analyzed theoretically by numerical computations of temperature derivative of refractive indices. The temperature gradient of the KTP crystal, phase matching angles change with difference boundary temperature of the KTP crystal, and tolerance temperature was analyzed. In the experiment, when two KTP crystals of difference type II phase matching condition (Φ=23.6°, Θ=90° at 27°C temperature, Φ=24.7°, Θ=90° at 80°C temperature) were applied to compensate the phase mismatching of the type-II KTP crystals. The maximum average 532nm output power of 85 W and 110W were generated when the boundary temperature of KTP were kept in 4°C and 48.8°C respectively. The corresponding conversion efficiency is 9.03% and 11%.
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De-Gang Xu, De-Gang Xu, Jian-Quan Yao, Jian-Quan Yao, Rui Zhou, Rui Zhou, Bai-Gang Zhang, Bai-Gang Zhang, Peng Wang, Peng Wang, } "Phase mismatch compensation of second harmonic generation with controlling boundary temperature of type-II KTP crystal in high-power green laser", Proc. SPIE 5627, High-Power Lasers and Applications III, (26 January 2005); doi: 10.1117/12.575039; https://doi.org/10.1117/12.575039
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