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用遗传算法设计了多层光学膜.设计时只要事先确定最大层数,算法就可自动优化选择合适的层数,同样每层的镀膜材料及厚度也由算法自动优化选择.设计中采用了不同以往的评价函数.在LBO(LiB3O5)晶体上用两种评价函数设计了1064 nm,532 nm二倍频增透膜.前一种评价函数设计的增透膜在1064 nm和532 nm处的透射率分别达到99.98%和99.99%,后一种评价函数设计的增透膜在两处的透射率均达到100.00%.在K9玻璃上设计了可见光宽带增透膜,450~650 nm范围的宽带增透膜的透射率均超过99.91%,390~780 nm范围的宽带增透膜的透射率均超过99.30%.采用的评价函数对膜系结构的变化敏感时,用遗传算法设计才有效.
The multi-layer optical film is designed by using genetic algorithm.As long as the maximum layer number is determined in advance, the algorithm can automatically optimize and choose the appropriate layer number, and the coating material and thickness of each layer are automatically optimized and selected by the algorithm. In the past, the 1064 nm and 532 nm doubling antireflection coatings were designed on LBO (LiB3O5) crystals by two evaluation functions.The transmittance of the antireflection coating designed by the former evaluation function at 1064 nm and 532 nm Rate of 99.98% and 99.99%, respectively, and the transmittance of the AR coating designed by the latter evaluation function reaches 100.00% at two places. The visible light broadband AR coating is designed on the K9 glass and the broadband increase in the 450-650 nm range The transmissivity of the transmembrane was more than 99.91%, and the transmissivity of the broadband AR in the range of 390 ~ 780 nm was more than 99.30% .When the evaluation function was sensitive to the change of the membrane structure, the genetic algorithm was effective.