用于KDP晶体保护的AF2400-SiO_2疏水光学薄膜  

AF2400-SiO_2 Composite Water-Repellent Film for KDP Protection

作　　者：汪国庆[1] 沈军[1] 谢志勇[1] 吴广明[1] 肖轶群[1] 

机构地区：[1]同济大学物理系,上海200092

出　　处：《中国激光》2006年第3期380-384,共5页Chinese Journal of Lasers

基　　金：国家自然科学基金重点项目;面上项目(21033040;69978017);国家863计划(2002AA842052);上海纳米科技与产业促进中心项目(0352nm043;0352nm056)资助课题

摘　　要：在惯性约束聚变（ICF）装置中大量使用具有变频特性的水溶性磷酸二氢钾（KDP）类晶体材料。在KDP晶体上镀制薄膜材料成为保护KDP晶体的有效措施。以正硅酸乙酯（TEOs）为原料，采用溶胶-凝胶法和提拉方式制备膜厚λ／4的增透膜，再采用具有高憎水特性、高透射率、低折射率的氟聚合物AF2400在FC-75的可溶解特性，在SiO2增透膜上旋涂AF2400防潮膜。对薄膜的表面形貌、疏水性能、光学性能和抗激光损伤阈值等进行了测试。结果显示，AF2400-SiO2复合光学薄膜表面平整，折射率为1．21，疏水角可以达到110°～120°，抗激光损伤阈值为19．5J／cm^2，是性能优良的疏水光学薄膜，可用于三倍频晶体KDP的保护。Inertial confinement fusion （ICF） establishment needs lots of high quality, large caliber and nonlinear optical material potassium dihydrogen phosphate （KDP）, which is water-soluble crystal. It is necessary to prepare a moisture-barrier protective film with good performance on the surface of KDP crystals. Antireflective SiO2 coating has been prepared by tetraethyl orthosilicate （TEOS） and sol-gel route with dip coating method. The surface of SiO2 film was disposed with teflon AF2400. The properties of the AF2400-SiO2 composite film had been characterized and measured by atomic force microscope （AFM）, Fourier transform infrared （FTIR）, UV-VIS-NIR spectroscopes etc. The experimental results show that the light transmission of AF2400-SiO2 composite film is 97.7% at 355 nm, the refractive index is 1.21. The AFg400-SiO2 composite films have fine water-repellent performance, high laser damage threshold （19.5 J/cm^2 ） and excellent optical property. The composite film can be used for protection of KDP crystal.

关 键 词：薄膜 AF2400-SiO2 复合薄膜 KDP晶体保护 溶胶-凝胶法 

分 类 号：O484.4[理学—固体物理]