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Proceedings Paper

Gray-tracking susceptibility in KTiOPO4 crystals
Author(s): Shinji Motokoshi; Takahisa Jitsuno; Masahiro Nakatsuka; Yasukazu Izawa
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Paper 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.

Paper Details

Date Published: 3 April 2000
PDF: 7 pages
Proc. SPIE 3889, Advanced High-Power Lasers, (3 April 2000); doi: 10.1117/12.380944
Show Author Affiliations
Shinji Motokoshi, Institute for Laser Technology (Japan)
Takahisa Jitsuno, Osaka Univ. (Japan)
Masahiro Nakatsuka, Osaka Univ. (Japan)
Yasukazu Izawa, Osaka Univ. (Japan)


Published in SPIE Proceedings Vol. 3889:
Advanced High-Power Lasers
Marek Osinski; Howard T. Powell; Koichi Toyoda, Editor(s)

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