基于相位型空间光调制器的光束控制技术研究

非机械伺服控制的液晶空间光调制器（LCSLM ）通过控制加载在每个像素上的电压能够实时调制波前相位实现光束偏转，基于菲涅耳透镜模型和闪耀光栅模型验证了光束偏转控制能力，包括偏转距离、衍射效率与不同模型参数之间的关系，入射光波长为1550 nm时，x轴或y轴可实现的最大偏转角度为6.96°(±3.48°)，光束能够在光轴方向与二维平面偏移。针对光束的高速灵敏、精准和大角度的扫描应用需求，提出了基于LCSLM的光波前相位调控算法，通过计算需要补偿的相位建立相位变换模型并满足光束控制流程，设计并构建了基于LCSLM的光束偏转及扫描实验系统，实验结果表明光场中任意位置的光斑可在接收视场360°范围内灵活偏移控制。该研究对于自由空间无线光通信、光束敏捷控制、非机械式光束的捕获瞄准跟踪等领域具有重要的应用价值。

Research on beam control technology based on a phase spatial light modulator

The nonmechanical servo-controlled liquid crystal spatial light modulator (LCSLM) can modulate the wavefront phase in real time to achieve beam deflection by controlling the voltage loaded on each pixel. The beam deflection control ability is verified based on the Fresnel lens model and the blazed grating model. Including the relationship between deflection distance, diffraction efficiency and different model parameters, when the incident light wavelength is 1550 nm, the maximum deflection angle that can be achieved by the x-axis or y-axis is 6.96° (±3.48°), and the beam can be aligned with the two-dimensional plane offset. Aiming at the high-speed, sensitive, precise and large-angle scanning application requirements of the beam, a light wavefront phase adjustment algorithm based on the LCSLM is proposed. The phase conversion model is established by calculating the phase that needs to be compensated, and the beam control process is satisfied. The LCSLM-based beam is designed and constructed with a deflection and scanning experimental system, and the experimental results show that the light spot at any position in the light field can be flexibly shifted and controlled within a 360° recieving field of view. This research has important application value in the fields of free-space wireless optical communication, agile beam control, nonmechanical beam capture, aiming and tracking.