3 March 2000 Evaluation of KTiOPO4 crystals for high-power laser
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Abstract
The gray-tracking of KTiOPO4 nonlinear crystals, which is used for second harmonic generation of solid state lasers, have been investigated. The susceptibilities of gray-tracking were evaluated by measuring the reduction of transmittance of the crystal with the second harmonics pulse of Nd:YAG laser, and were compared with the optical absorption coefficients and contaminants in each crystal. As result, the susceptibility indicated a dependence on the initial absorption at 532-nm wavelength. Moreover, it was prevented with increasing hydroxyl concentration in the crystals. We propose a new approach toward the improvement of gray-tracking for KTP crystals annealing process under control if the humidity.
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Shinji Motokoshi, Takahisa Jitsuno, Masahiro Nakatsuka, Yasukazu Izawa, "Evaluation of KTiOPO4 crystals for high-power laser", Proc. SPIE 3902, Laser-Induced Damage in Optical Materials: 1999, (3 March 2000); doi: 10.1117/12.379302; https://doi.org/10.1117/12.379302
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