高精度菱体型消色差延迟器的优化设计

为了提高菱体型消色差λ/4相位延迟器的精度,采用使λ/4相位延迟器的延迟误差为正负偏差和在设计时选择较大的折射率的方法,对延迟器件进行了理论分析和实验验证,取得了设计高精度λ/4相位延迟器的数据。结果表明,设计的延迟器件在350nm～2000nm的光谱范围内延迟量两次为90°,且最大延迟误差小于0.04°。与常规设计的延迟器件相比,新设计的延迟器件不仅可以扩大消色差范围,而且还可以大大提高消色差精度。这一结果对设计高精度λ/4相位延迟器是有帮助的。

Optimization of high precision rhomb-type achromatic retarders

In order to improve precision of rhomb-type achromatic A/4 phase retarders,based on the positive and negative delay error of A/4 phase retarders and larger refractive index,high precision retarders were designed.The retarder was analyzed and validated in experiments,and the data of high precision λ/4 phase retarder were obtained.It is shown at the retardation curve within the range of 350nm to 2000nm that retardation is 90°at two wavelengths and the maximal retardance error is smaller than 0.04°.Comparing with conventional retarders,the new retarder not only extends achromatic range,but also improves achromatic precision.The results are helpful to design high precision λ/4 phase retarders.