The traditional dual frequency laser with controllable frequency difference was based on birefringence effect.By studying phase characteristics of the S-polarized and P-polarized light in total internal reflection and antire-flection films,a dual frequency laser with controllable frequency difference based on dual total internal reflection and tilted antireflective film is proposed.Frequency difference is controlled by adjusting the incident angle or designing the structure of antireflective film.Finally,the experimental results show that a hard sealing transmission window of heli-um-neon laser has large uncontrolled but stable thermal residual stress birefringence.Dual frequency laser with medi-um frequency can be made by this method.%传统的可控频率差的双频激光器是基于双折射效应来实现的，研究了 S 偏振光和 P 偏振光在全内反射和减反射薄膜的相位特性，提出基于双全内反射和倾斜减反射膜的相移之间的差别来实现可控双频激光。通过调节入射角的大小或设计不同的薄膜结构来控制双频激光器的频率差。最后在实验中发现，氦氖激光器的硬封接的透射窗存在较大的残余热应力双折射，可产生不可控却稳定的残余热应力双折射，用于制作频率差为中频的双频激光器。
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