基于多光束干涉原理，推导了斜入射状态下非平行角度调谐滤光片的高斯光束透射光强表达式。在此基础上研究了高斯光束的入射角以及非平行滤光片两端面间所存在楔角对透射光强分布的影响。计算和实验结果都表明，滤光片的透射光强分布不仅与入射角有关，非平行滤光片两端面间楔角的大小和正负特性还会在很大程度上影响斜入射时滤光片的光场分布、透射率和矩形度。要保证滤光片在斜入射时透射率和矩形度的稳定，就必须在切片时提高滤光片的平行度。

Based on the multi-beam interference principle, the Gaussian beam transmitted-intensity expression on a non-parallel angle-tuned thin-film filter in oblique incidence has been derived. According to the result, the influence of the transmitted-intensity distribution with different incident angles, especially with different wedge angles of the non-paralleled thin-film filter has been analyzed theoretically. The calculation and experimental results show that the transmitted-intensity distribution, transmitted-peak and the rectangle degree are greatly influenced by the wedge angle, the incident angle and the polarity of the wedge angle. In order to get stable transmitted-characteristics and high rectangle degree, the parallelism of the angle-tuned thin-film filter should be improved in fabrication.