非共线声光可调滤波器(AOTF)是一种利用反常声光作用原理制成的新型分光器件，其衍射信号的光谱分辨率和旁瓣是评价AOTF 性能的两个重要指标。阐述了通过两个AOTF 进行二次滤波的基本原理。实验证实了二次滤波法可使AOTF 衍射信号的光谱分辨率提高40.4%~3.2%和旁瓣抑制9.5570 dB 到13.2407 dB。研究结果表明用两个AOTF 进行二次滤波在声光滤波领域有着巨大的应用前景。

The noncollinear acousto-optic tunable filter (AOTF) is a new type of spectral component that is developed according to the abnormal acousto-optic interaction principle. The spectral resolution and sidelobe of diffraction signal are two important indices for evaluating the performance of AOTF. The basic principle of doublefiltering using two AOTFs is described. The experimental results confirm that the double-filtering achieves a 40.4% to 83.2% improvement in the spectral resolution and from 9.5570 dB to 13.2407 dB suppression of the sidelobes. The results of this exploratory study demonstrate that double-filtering using two AOTFs has great potential for application in the field of the acousto-optic filtering.