反常氧化碲声光偏转器控制理论研究

Control Theory of Abnormal TeO_2 Acousto-optical Deflector

根据晶体的声光特性以及反常布喇格衍射的Dixon方程,得出了氧化碲声光偏转器在反常布拉格衍射条件下的参量矢量关系.分析了超声波方向、入射光角度、衍射光角度与声波频率之间的关系.针对卫星光通信中衍射角固定的应用情况,通过数值求解和参量拟合,建立了一个基于平面方程的简单控制模型.利用该模型可以很快得到超声控制频率,使衍射角固定不变.

The relationship between acoustic wave direction, laser incident angle, and laser diffraction angle of TeO2 acousto-optical deflector with acoustic frequency was analyzed based on the TeO2 crystal acousto- optical characteristic and Dixon equations under abnormal Bragg diffraction. A simple linear model for the fixed diffraction angle was set up by numerical calculation and parameter fitting. Using the linear model, acoustic wave frequency for fixed laser diffraction angle could be obtained easily.