真空 ›› 2022, Vol. 59 ›› Issue (6): 22-28.doi: 10.13385/j.cnki.vacuum.2022.06.04
刘祺1, 徐均琪1, 苏俊宏1, 韩刚2, 李阳1, 袁松松1
LIU Qi1, XU Jun-qi1, SU Jun-hong1, HAN Gang2, LI Yang1, YUAN Song-song1
摘要: 采用双源共蒸MgF2和ZnS的方法,通过控制两种材料的沉积速率比,获得了制备梯度折射率薄膜所需要的中间折射率材料。将G|HL|A双层减反膜梯度化为5层,保持总光学厚度不变,制备了折射率沿厚度方向按1.91、1.77、1.64、1.48、1.38(波长532nm)渐变的梯度折射率减反膜。对所有薄膜样品进行了光学和激光损伤特性的测试,结果表明:双源共蒸MgF2和ZnS所得复合膜的折射率,及两种材料的沉积速率比,满足Drude理论导出的关系式;复合膜的折射率符合正常色散,除折射率为1.91的复合膜吸收较大(532nm处消光系数为0.01),其余复合膜都表现出较小的吸收(532nm处消光系数均小于0.002);用100mJ能量激光辐照所有单层膜样品,折射率为1.64的复合膜激光损伤程度最小,表现出比单组分MgF2和ZnS薄膜更高的抗激光损伤能力;将双层减反膜等效为折射率梯度渐变的5层后,减反射带宽从205nm扩展到了380nm,激光损伤阈值从2.0J/cm2提高到了3.7J/cm2,提高了85%。综上可知,采用双源共蒸技术,通过调节两种材料蒸发速率比,制备折射率按一定规律渐变的薄膜是可行的。只要两种材料比例合适,利用共蒸技术可获得抗激光损伤性能高于单组分薄膜的复合膜。梯度折射率减反膜可拥有比双层减反膜更好的光学特性和更高的激光损伤阈值。
中图分类号:
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