声光偏转器在定向激光通信精跟踪单元的应用技术研究

Technology Research of Acousto-Optic Deflector Used in Fine Tracking Unit of Directional Laser Communication

为更好地改进激光通信的精跟踪单元,抑制卫星平台的高频扰动,本文从带宽和迟滞性两方面比较了PZT及AOD。分析得出,AOD对千赫兹量级下的扰动信号响应只有1%的相位延迟,PZT的则失真很严重。在迟滞性方面,PZT去程和回程间的差值最大达到了18.6%,而AOD的只有万分之2,其数值占PZT的1/930。这为AOD在激光通信中的应用起到了一定的促进作用。

In order to improve the fine tracking unit of laser communications and inhibit high frequency disturbance of satellite platform, we compare bandwidth and hysteresis of PZT with those of AOD. It obtains that the phase delay of AOD response is only 1% for perturbation signal with frequency below several kilohertz. It is a great breakthrough with respect to the complete distortion of the PZT. Meanwhile, the maximum hysteresis difference of inbound and outbound processes for PZT is 18.6%. While the AOD＇s is only two ten-thousandths. It is PZT＇s 1/930. These are beneficial for AOD to be used in laser communications.