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Water-associated surface degradation of CsLiB6O10 crystal during harmonic generation in the ultraviolet region

Published online by Cambridge University Press:  31 January 2011

Yukihiro Morimoto ,
Shintaro Miyazawa ,
Yoshio Kagebayashi ,
Naoki Kitatochi ,
Toshio Yokota  and
Jun Sakuma
Yukihiro Morimoto*
Affiliation:
Research and Development Center, Gotenba Laboratory, Ushio Inc., 1–90 Komakado, Gotenba, Shizuoka 412–0038, Japan
Shintaro Miyazawa
Affiliation:
Research and Development Center, Gotenba Laboratory, Ushio Inc., 1–90 Komakado, Gotenba, Shizuoka 412–0038, Japan
Yoshio Kagebayashi
Affiliation:
Research and Development Center, Gotenba Laboratory, Ushio Inc., 1–90 Komakado, Gotenba, Shizuoka 412–0038, Japan
Naoki Kitatochi
Affiliation:
Ushio Research Institute of Technology Inc., 1–90 Komakado, Gotenba, Shizuoka 412–0038, Japan
Toshio Yokota
Affiliation:
Ushio Research Institute of Technology Inc., 1–90 Komakado, Gotenba, Shizuoka 412–0038, Japan
Jun Sakuma
Affiliation:
Ushio Research Institute of Technology Inc., 1–90 Komakado, Gotenba, Shizuoka 412–0038, Japan
*
a)Address all correspondence to this author. Present address: 1194 Sazuchi, Bessyo-cho, Himeji 671-0224, Japan. e-mail: morimoyk@mail.ushio.co.jp
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Abstract

A study of the mechanisms of CsLiB6O10 (CLBO) crystal performance degradation during harmonic generation in the ultraviolet (UV) region was performed. The degradation rate of transmissivity during irradiation with the fourth harmonic light of an Nd3+ doped YLiF4 laser (4.7 eV) was linearly proportional to the concentration of hydroxyl (OH) groups in the CLBO crystal. In this study, the formation of OH groups was recognized by infrared absorption spectroscopy, and a method for determination of OH groups was proposed. The concentration of OH groups in the CLBO was linearly proportional to water vapor pressure and the CLBO containing OH groups absorbed UV light. We propose that one of the main mechanisms of surface degradation is the generation and growth of the mutants and that these mutants are generated by a UV photon-assisted reaction via OH group formation associated with absorbing water molecules into CLBO crystal.

Type
Articles
Information
Journal of Materials Research , Volume 16 , Issue 7 , July 2001 , pp. 2082 - 2090
Copyright
Copyright © Materials Research Society 2001

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References

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