针对液晶光学相控阵(LCOPA)调制相位分布测量实时可溯源的问题,结合空间啁啾技术与双光梳干涉测量技术,提出一种基于光梳的空间高分辨相位测量方法。针对光栅以及光梳光源的参数对系统空间分辨率以及测量视场的影响进行理论仿真分析。理论仿真结果表明,该方法的测量视场可达100 mm,空间分辨率优于2 μm。实验结果表明,该方法能够在微秒时间尺度内实现LCOPA多通道驱动电极调制相位分布的快速测量,因此有望为LCOPA器件的研制和性能的评价提供有效途径。

To enable the real-time traceability of measurements of the modulated phase distribution produced by a liquid crystal optical phased array (LCOPA), a spatial high-resolution phase measurement method based on optical combs, which combines spatial chirp and dual-comb interferometry techniques, is proposed herein. Theoretical simulation analysis is conducted to study the influence of the parameters of the grating and optical comb light source on the system''s spatial resolution and measurement field of view. Theoretical simulation results show that the field of view measured using this method can reach more than 100 mm, and the spatial resolution is better than 2 μm. Further, experimental results show that this method can enable the rapid measurement (microsecond timescale) of the modulation phase distribution generated by a multichannel LCOPA driving electrode. Thus, the proposed method is expected to provide an effective way for the development and performance evaluation of LCOPA devices.