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中文摘要：
从求解描述反常声光相互作用几何关系的Dixon方程出发,得到了具体参数下的一组较优的入射角和衍射角。根据实际应用系统的需求,分析了包括TeO2晶体在PAT系统光路中的放置方向及其端面切割角度等在内的参数,设计了一种收发光波长均为800 nm的反常AOD模型结构。基于此结构,分析了发射光波长取800~830 nm时,由收发光波长差异所产生的指向偏差。结果表明：830 nm的发射光在超声波中心频率f0=101 MHz处的指向偏差可达-4.981 7 mrad。因此,提出采用收发分离式PAT系统来避免此种指向偏差。
英文摘要：
The better group of the incidence angle and diffraction angle were obtained by solving Dixon equation which discribed geometric relation of abnormal acousto-optic effect.With the orientation of placement in PAT system and cut angle of interface of TeO2,an abnormal acousto-optic deflector（AOD） model configuration for 800nm wavelength was designed.Based on this configuration,the pointing deviation caused by the difference of wavelength between transmitting and receiving beams was analyzed,with the wavelength of transmitting beam 800-830 nm.The result shows that when the wavelength is 830 nm,the pointing deviation can be-4.981 7 mrad at the ultrasonic central frequency where f0=101 MHz.The bi-static PAT system is proposed to avoid the pointing deviation.
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