Multiple-pulse damage of BK-7 glass

Kunio Yoshida; Hiroshi Yoshida; T. Noda; Sadao Nakai

doi:10.1117/12.57238

1 June 1991 Multiple-pulse damage of BK-7 glass

Kunio Yoshida, Hiroshi Yoshida, T. Noda, Sadao Nakai

Proceedings Volume 1441, Laser-Induced Damage in Optical Materials: 1990; (1991) https://doi.org/10.1117/12.57238
Event: Laser-Induced Damage in Optical Materials: 1990, 1990, Boulder, CO, United States

Abstract

High-power glass laser systems for laser fusion use many BK-i glasses and the laser-induced damage of this glass is a serious problem. Since the BK-i glass is generally melted in platinum (Pt) crucibles the laser damage due to metallic Pt particles occurs inside the glass. The Pt particles cause fractures when irradiated at a fluence higher than 3 J/cm with 1064 nm 15 ns laser pulse. The size of the fracture increases with irradiation fluence and the damaged glass has to be replaced. In special cases BK-i glass is melted in ceramic crucibles but there is a problem of cristobalite production inside the BK-i glass. The laser damage threshold of cristobalite is about 4. 5-5. 5 JIcm with 1064 nni 15 ns laser pulse. We have found average damaged particles in BK-i glasses melted in Pt and ceramic crucibles to be 200-400 and 10 particles per liter respectively. At present laser damage in BK-i glass is being improved by changing a composition ratio of melting materials.

Citation Download Citation

Kunio Yoshida, Hiroshi Yoshida, T. Noda, and Sadao Nakai "Multiple-pulse damage of BK-7 glass", Proc. SPIE 1441, Laser-Induced Damage in Optical Materials: 1990, (1 June 1991); https://doi.org/10.1117/12.57238

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