Preparation and stress evolution of sol-gel SiO2 antireflective coatings for small-size anisotropic lithium triborate crystals

被引:9
作者
Tian, Bingtao [1 ,2 ]
Wang, Xiaodong [1 ,2 ]
Niu, Yanyan [1 ,2 ]
Zhang, Jinlong [2 ,3 ,4 ]
Zhang, Qinghua [5 ]
Zhang, Zhihua [1 ,2 ]
Wu, Guangming [1 ,2 ]
Zhou, Bin [1 ,2 ]
Shen, Jun [1 ,2 ]
机构
[1] Tongji Univ, Shanghai Key Lab Special Artificial Microstruct M, Shanghai 200092, Peoples R China
[2] Tongji Univ, Sch Phys Sci & Engn, Shanghai 200092, Peoples R China
[3] Minist Educ, Key Lab Adv Microstruct Mat, Shanghai 200092, Peoples R China
[4] Tongji Univ, Inst Precis Opt Engn, Shanghai 200092, Peoples R China
[5] Chengdu Fine Opt Engn Res Ctr, Chengdu 610041, Peoples R China
来源
AIP ADVANCES | 2016年 / 6卷 / 04期
基金
中国国家自然科学基金;
关键词
INDUCED DAMAGE THRESHOLD; THIN-FILMS; MECHANICAL-PROPERTIES; OPTICAL-PROPERTIES; RESIDUAL-STRESS; LASER; ZRO2; LBO; LIB3O5; NM;
D O I
10.1063/1.4947135
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Lithium triborate (LiB3O5, LBO) crystal is now one of the most useful nonlinear optical materials for frequency conversion of high power lasers. The use of the crystal, however, has been hampered by the unavailability of antireflective (AR) coatings with high laser damage resistance. In this work, a "point contact" dip-coating method is developed to prepare sol-gel SiO2 AR coatings on small-size LBO crystals. Using this approach, we obtain a homogenous coating surface on an 8 mmx8 mmx3 mm LBO crystal. The stress measurements show that the stresses in sol-gel SiO2 coatings vary with the time of natural drying, which is beyond our expectation. The anisotropic Young's modulus of the LBO crystal and the different evolution tendency of the stress in the different SiO2 coating layers are found to be responsible for the crack of the double-layer AR coatings on anisotropic LBO crystal. Meanwhile, the resulting coatings on LBO crystal achieve a LIDT of over 15 J/cm(2) (532 nm, 3ns) and the coated LBO is expected to have a transmittance of over 99% at 800 nm. (C) 2016 Author (s).
引用
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页数:10
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