Dual-wavelength design of high precision rhomb-type achromatic retarders
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摘要: 为了提高菱体型消色差延迟器件的消色差精度,当光以两个波长设计点入射时,根据光的折射定律,并采用全内反射角θ和折射角r之和为固定值的方法,进行了双波长设计的理论分析。由于延迟误差为正负偏差,整个光谱区域内在两个波长设计点延迟量为90°,同时设计时对两个波长设计点的选择进行了优化,使λ/4相位延迟器的消色差精度大大提高。用LaK2玻璃对λ/4相位延迟器在360nm～1160nm的光谱区域内进行设计,取得了最大延迟误差小于0.02°的数据。结果表明,与其它两种设计方法相比,该方法不仅设计理论简化,而且具有更高的消色差精度。这一结果对设计高精度消色差延迟器是有帮助的。Abstract: In order to improve the precision of rhomb-type achromatic retarders,according to the optical refraction rule and based on that the sum of the angle of total reflection θ and the reflection angle r is constant,dual-wavelength design was analyzed for two different wavelength beams incident on the retarder.Since the delay errors were the positive and negative,retardation was 90° at two wavelengths in the whole region of spectrum.Simultaneously,achromatic precision of the λ/4 retarder was enhanced greatly after optimum design for two wavelengths.The maximal delay error was smaller than 0.02° for a λ/4 retarder designed with LaK2 glass within the range of 360nm~1160nm.Compared with other two designing methods,the new designed retarder not only simplifies the designing theory,but also has higher achromatic precision,and the results are helpful to the design of high precision rhomb-type achromatic retarders.
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Keywords:
- optical devices /
- high precision /
- refraction rule /
- achromatism
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