该文介绍了一种双波段大孔径角声光可调滤光器的设计方法和测试结果。该滤光器具有同时滤出可见光与中波的功能，其高频段滤出可见光(450~750 nm)，低频段滤出中波(3 000~4 500 nm)。滤光器采用氧化碲晶体作为声光介质材料，入射极角取20°，可见光波段的超声极角取98.55°，中波波段的超声极角取99.65°，在可见波段互作用长度为3 mm、中波波段互作用长度为23.1 mm时，可见光与中波波段同时获得了大于6°的孔径角。

This paper introduces the design method and testing results of a dual-band acousto-optic tunable filter with large aperture angle. This tunable filter has the function of simultaneously filtering out visible light and mid-waves, its high-frequency band is responsible for filtering out visible light (450-750 nm), and the low-frequency band is responsible for filtering out mid-waves (3 000-4 500 nm). This filter employs tellurium dioxide crystals as the acousto-optic medium material, with an incident angle of 20°, an ultrasonic angle of 98.55° for the visible light band, and an ultrasonic angle of 99.65° for the mid-wave band. When the interaction lengths are 3 mm for the visible wave band and 23.1 mm for the mid-wave band, both the visible light and mid-wave bands achieve an aperture angle of greater than 6°.