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在液晶相控阵中,由于电压量化、边缘效应、液晶器件制造工艺等因素的影响,导致实际的波前相位面与理想的波阵面存在误差。因此,在应用中要依据实际出射相位与理想出射相位的偏差,反复地修正加载电压,对入射激光波前进行相位调制,以此来满足视场域内波束扫描的需要,这也是液晶相控阵波束控制技术研究的关键问题。为解决上述问题,提出了一种波前相位恢复算法。该算法利用三个输出面的幅度信息迭代计算出波前相位分布,相比只用两个输出面幅度信息的相位恢复算法,该算法具有较高的精确度。同时,该算法利用角谱理论处理输出面的光场传播过程,使得所得到的恢复结果更加精确。仿真实验进一步表明,这种算法在精确度、效率上同时具有优势。
In the liquid crystal phased array, the actual wavefront phase plane and the ideal wavefront are inaccurate due to the influence of voltage quantization, edge effect and manufacturing process of the liquid crystal device. Therefore, it is necessary to repeatedly correct the loading voltage according to the deviation of the actual exit phase and the ideal exit phase in application to phase-modulate the incident laser wavefront so as to satisfy the requirement of beam scanning in the field of view, which is also the result of the liquid crystal phased array Key Issues in Beam Control Technology Research. To solve the above problem, a wavefront phase recovery algorithm is proposed. The algorithm uses the amplitude information of three output surfaces to iteratively calculate the wavefront phase distribution. Compared with the phase recovery algorithm which only uses the amplitude information of two output planes, this algorithm has high accuracy. At the same time, the algorithm uses the angular spectrum theory to process the light field propagation on the output surface, which makes the obtained restoration result more accurate. Simulation experiments further show that this algorithm has both advantages in accuracy and efficiency.