用于多色光的波片的设计

Design of the Wave Plate for Polychromatic Light

在偏振光路中有时需要交替使用不同波长的光束 ,为使光路保持最佳状态 ,常需要根据不同的工作波长选用相应波长的波片。为此提出了多波长波片的概念 ,给出了多波长波片的设计方法 ,具体设计了有实用价值的双波长四分之一波片 ,并成功地应用于一个实际的光学系统中 ,从而验证了多波长波片设计思想的正确性。虽然多波长波片不一定能完全等效于多个严格意义上的单波长波片 ,但在一定的误差范围内所设计的多波长波片是能满足实际需要的 ,从而避免了频繁更换不同波长波片的麻烦。

Sometimes the beams with different wavelengths are needed to alternatively applied to the polarized light path.In order to keep the light path in optimal state,the wave plates with corresponding wavelengths must be chosen according to the different operating wavelengths.For this reason an idea of multi-wavelength wave plate is put forward in the paper and the design method for the multi-wavelength wave plate is given.A double-wavelength quarter-wave plate with practical value is concretely designed and it has been successfully applied to a practical optical system,thus demonstrates the correctness of the design idea for multi-wavelength wave plate.The multi-wavelength wave plate is not fully equivalent to several wave plates in the strict significance,but the wave plate designed within a certain error range can fulfil the practical requirements,thus avoid the trouble for frequently changing the wave plates with different wavelengths.