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研究非共线性声光可调谐滤波器(AOTF)在一般相位匹配条件下的声光相互作用关系。对于通常设计制造的声光可调谐滤波器,它的o光和e光具有不同的波长,应用中无法同时使用此两束衍射光,为了使可用光强增大,应当使两束衍射光的波长相等。研究了使一般声光可调谐滤波器晶体两束衍射光波长相等的方法。对于未按照等值点理论制造的声光可调谐滤波器晶体,可以使入射光与晶体表面的法线成一个小的角度,根据一般相位匹配原理可以使两束光的出射波长相等。在实验中证明此方法的正确性,此角度称为等值偏置角。对于不同数值的衍射波长,有不同的等值偏置角,最后给出了等值偏置角随衍射波长的变化规律。
The acousto-optic interaction of non-collinear acousto-optic tunable filter (AOTF) under the condition of general phase matching is studied. The commonly designed and manufactured acousto-optic tunable filter, its o light and e light have different wavelengths, the application can not be simultaneously using the two beams of diffracted light, in order to make available light intensity, should make the two diffracted light Equal wavelength. The method of equalizing the wavelength of two diffracted light of a general acousto-optic tunable filter crystal is studied. For acousto-optic tunable filter crystals not manufactured according to the equivalent point theory, the incident light can be made at a small angle to the normal of the crystal surface. According to the principle of general phase matching, the outgoing wavelengths of the two beams can be equalized. In the experiment, the correctness of this method is proved. This angle is called the equivalent offset angle. For different values of the diffraction wavelength, there are different equivalent offset angles, and finally, the law of the equivalent offset angle with the diffraction wavelength is given.