对于双折射偏振光干涉滤波器 ,提出了一种产生平坦化光谱透射率函数的傅里叶级数对比的搜索方法 ,可在较大的通带和阻带范围内寻找到抖动很小时的所有可能的晶体偏转角度的数值解。给出了三块双折射晶体结构的抖动不大于 0 .1%时的晶体偏转角度的数值解 ,讨论了晶体偏角和厚度的变化对透射率函数波形的影响。 For the birefringent polarization interference filter, a search method of Fourier series comparison to produce a flattened spectral transmittance function is proposed, which can find all the signals with small jitter in the range of large passband and stopband Numerical solution of possible crystal deflection angles. The numerical solution of the crystal deflection angle of three birefringent crystal structures with jitter less than 0.1% is given. The influence of the variation of crystal angle and thickness on the transmittance function waveform is discussed.