液晶光学相控阵的双波束成形和2维扫描技术

Dual beam formation and 2-D scan technique of liquid crystal optical phased array

为了在光学相控阵中实现双波束成形和2维扫描,以玻璃作为基底材料,以液晶作为移相介质,利用液晶的电控移相特性,对入射光束进行双波束成形和相控空间扫描;采用现场可编程门阵列芯片对液晶驱动芯片进行波控数据发送,完成对液晶移相阵列的电压驱动,从而达到电控光束扫描功能,完成单个透射型液晶光学相控阵组件的研制;利用该组件的电控光束扫描功能,采用多个组件级联的方式,实现基于透射型液晶光学相控阵组件的双波束成形和2维扫描技术。结果表明,该系统能够实现双波束独立偏转控制,以及高精度的空间2维偏转。

In order to realize dual beam formation and 2-D scan in optical phased array, choosing glass as substrate material and liquid crystal as phase-shifting medium, using the electric control phase-shifting characteristics of liquid crystal, double beam formation and phase control spatial scanning of incident light were gotten. Wave control data were transmitted to LCD driver chip by FPGA chip and the liquid crystal phase shifting array was driven by voltage, and beam scanning function was controlled, so a single transmissive-type liquid crystal optical phased-control array assembly was developed. Therefore, based on beam scanning function of the assembly, a liquid crystal optical phased array was developed by cascading multiple-assembly to realize dual beam formation and 2-D scan. The results show that the cascading system has the ability to achieve double beam independent deflection control and high precision 2-D deflection.