The results indicate that the two layer antireflection coating of ta2o5 / sio2 could achieve the aim of low reflectance in the broad wave band by the optimization . numerous experiments and a series of testing have been carried out 理论分析与计算结果表明,双层增透膜ta _ 2o _ 5 sio _ 2系最优化设计的结果,能够达到宽波段范围内的增透效果。