Improvement of surface laser damage resistance in CsLiB6O10 crystal for high-power UV lasers

Tomosumi Kamimura; Kazuhito Nakai; Masashi Yoshimura; Yusuke Mori; Takatomo Sasaki; Yukikatsu Okada; Hidetsugu Yoshida; Masahiro Nakatsuka; Tetsuo Kojima; Kunio Yoshida

doi:10.1117/12.380917

3 April 2000 Improvement of surface laser damage resistance in CsLiB₆O₁₀ crystal for high-power UV lasers

Tomosumi Kamimura, Kazuhito Nakai, Masashi Yoshimura, Yusuke Mori, Takatomo Sasaki, Yukikatsu Okada, Hidetsugu Yoshida, Masahiro Nakatsuka, Tetsuo Kojima, Kunio Yoshida

Author Affiliations +

Proceedings Volume 3889, Advanced High-Power Lasers; (2000) https://doi.org/10.1117/12.380917
Event: Advanced High-Power Lasers and Applications, 1999, Osaka, Japan

Abstract

Effect of ion beam etching on surface damage resistance was investigated in CsLiB₆O₁₀(CLBO) crystal. In high-power UV operation, an as-polished CLBO surface was damaged due to absorption of the polishing compound embedded inside the crystal surface. In the as-polished surface of CLBO, polishing compound ZrO₂ (absorption edge is about 300 nm) was detected to a depth of 60 nm. We have removed polishing compound with ion beam etching without degrading the surface quality. The effects of polishing compound removal on surface damage were characterized for the surface laser-induced damage threshold (LIDT) at 355 nm (pulse width 0.85 ns) as a function of etching depth and surface lifetime for the generation of fourth-harmonic of ND:YAG laser (266 nm, 20 ns, 4 kHz). We found an improvement of the surface damage resistance. LIDT of etched surface increased up to 15 J/cm² as compared with that of the as-polished surface of 11 J/cm². Etched CLBO surface also exhibits an improvement lifetime 4 times longer than that of as-polished surface.

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Tomosumi Kamimura, Kazuhito Nakai, Masashi Yoshimura, Yusuke Mori, Takatomo Sasaki, Yukikatsu Okada, Hidetsugu Yoshida, Masahiro Nakatsuka, Tetsuo Kojima, and Kunio Yoshida "Improvement of surface laser damage resistance in CsLiB₆O₁₀ crystal for high-power UV lasers", Proc. SPIE 3889, Advanced High-Power Lasers, (3 April 2000); https://doi.org/10.1117/12.380917

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KEYWORDS

Surface finishing

Ion beams

Etching

Polishing

Crystals

Resistance

Laser crystals

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