消色差相位延迟器是在某一宽度光谱范围内使用的光相位延迟器件。从相位延迟的全反射相变理论出发,对斜入射消色差相位延迟原理进行阐述,参考菲涅耳棱镜的具体设计形式,对引起相位延迟变化的参量进行分析,通过选择合适的材料新设计出了特殊角度入射的高精度相位延迟器,其理论曲线显示,在365～1150 nm的光谱区域内延迟偏差小于0.4°,是常规相位延迟器在相同条件下的五分之一,是一种宽广谱范围内、负延迟偏差小、精度高的消色差相位延迟器。

Achromatic retarder is such a device that can be used in wide spectrum in optical phase retardation. Based on the total-reflection phase transformation theory of the phase retardation, the principle of achromatic phase retardation with oblique incident angle is expounded. And based on the detailed design of Fresnel rhomb, the parameters which induced the change of phase retardation are analyzed. The new achromatic retarder with the specific incident angle and high precision is designed by choosing suitable material in this papaer. It is shown at the achromatic property curve within the range of 365 nm to 1150 nm theoretically that the retardation error is smaller than 0.4°, which is nearly one-fifth of the ordinary Fresnel rhomb phase retardation. So the new design retarder can be used in wide spectrum, at the same time it has the characteristic of small retardation error and high precision.