Gray-tracking susceptibility in KTiOPO4 crystals

Shinji Motokoshi; Takahisa Jitsuno; Masahiro Nakatsuka; Yasukazu Izawa

doi:10.1117/12.380944

3 April 2000 Gray-tracking susceptibility in KTiOPO₄crystals

Shinji Motokoshi, Takahisa Jitsuno, Masahiro Nakatsuka, Yasukazu Izawa

Proceedings Volume 3889, Advanced High-Power Lasers; (2000) https://doi.org/10.1117/12.380944
Event: Advanced High-Power Lasers and Applications, 1999, Osaka, Japan

Abstract

The gray-tracking of KTiOPO₄ nonlinear crystals, which is used for second harmonic generation of solid state lasers, have been investigated. The optical absorptions were measured, and then the susceptibilities of gray-tracking were observed by measuring the reduction of transmittance of the crystal by irradiating of the laser pulses with the second harmonics of Nd:YAG laser. In addition, impurities in the crystals were analyzed. In comparison with the susceptibilities and the absorptions, the susceptibility of the gray-tracking of KTP crystals indicated a dependence on the initial absorption at 532-nm wavelength. Moreover, it is prevented with increasing OH concentration in the crystals. We propose a new approach toward the improvement of gray-tracking for KTP crystals using annealing process under control of the humidity.

Citation Download Citation

Shinji Motokoshi, Takahisa Jitsuno, Masahiro Nakatsuka, and Yasukazu Izawa "Gray-tracking susceptibility in KTiOPO₄crystals", Proc. SPIE 3889, Advanced High-Power Lasers, (3 April 2000); https://doi.org/10.1117/12.380944

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