LIGO计划用大尺寸蓝宝石晶体光学均匀性和弱吸收获得进展

Progress of Optical Homogeneity and Weak-Absorption of Large -Sized Sapphire Crystal Used in LIGO Project

报道了113mm× 70mm蓝宝石晶体块的光学加工精度、光学均匀性和弱吸收等方面研究所取得的最新进展。晶体整个表面加工精度达到 3个光圈 (峰谷值约为 1 6 6 6λ) ;晶体的透过波前畸变为 1个光圈 (峰谷值约为0 5 84λ) ;在紫外波段的透过大于 80 % ,可见及红外光区的透过大于 86 % ;晶体的弱光吸收系数为 35× 10 - 6 cm～ 6 5× 10 - 6 cm。

The latest progress in the study of optical homogeneity and weak absorption of large sized sapphire crystal ( 113 mm×70 mm) is reported. The polishing precision of the whole crystal surface reaches 1.666λ, and the transfer wavefront distortion is 0.584λ. The transmission is higher than 80% at UV waveband and than 86% at VIS NIR waveband. The weak absorption coeffcient is 35×10 -6 /cm～65×10 -6 /cm.