Preparation and stress evolution of sol–gel SiO2 antireflective coatings for small-size anisotropic lithium triborate crystals
Preparation and stress evolution of sol–gel SiO2 antireflective coatings for small-size anisotropic lithium triborate crystals
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DOI：
10.1063/1.4947135
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发表时间：
2016-04
期刊：
影响因子：
1.6
通讯作者：
Tian Bingtao;Xiaodong Wang;Y. Niu;Jinlong Zhang;Qinghua Zhang;Zhihua Zhang;Guang-ming Wu;Bin Zhou;Jun Shen
中科院分区：
文献类型：
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作者：
Tian Bingtao;Xiaodong Wang;Y. Niu;Jinlong Zhang;Qinghua Zhang;Zhihua Zhang;Guang-ming Wu;Bin Zhou;Jun Shen
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 mm×8 mm×3 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/cm2 (532 nm, 3ns) and the coated LBO is expected to ...
