Research on the Factors Affecting the Stability of Amplitude-Type Optically Addressed Spatial Light Modulators

As a key optical field modulation component in high-power laser systems, the amplitude-type optically addressed spatial light modulator (OASLM) plays a critical role in determining the overall system performance and reliability. In this research, we systematically investigate the stability characteristics and jitter suppression mechanisms of OASLMs through comprehensive experiments and numerical simulations. The results reveal that although different models of electrically addressed liquid crystal on silicon (LCOS) modulators exhibit significant variations in jitter—reaching up to 67.64%—the jitter of the readout beam can be effectively suppressed to below 2% after modulation by the OASLM. Furthermore, the device demonstrates highly consistent and robust stability in the saturation regime. Analysis based on the addressing light modulation chain indicates that pixel aggregation and temporal low-pass filtering substantially attenuate jitter transmission, while the electro-optic saturation response of the liquid crystal layer under a high electric field further reduces the system’s sensitivity to external perturbations. These findings provide both theoretical guidance and experimental support for the design and optimization of high-stability OASLMs, offering valuable insights for advanced photonic applications such as inertial confinement fusion and high-resolution imaging.

作为高功率激光系统中的核心光场调制元件，振幅型光寻址空间光调制器（Optically Addressed Spatial Light Modulator，OASLM）对系统整体性能与可靠性起着决定性作用。本研究通过全面的实验与数值模拟，系统探究了OASLM的稳定性特性与抖动抑制机制。研究结果表明：尽管不同型号的电寻址硅基液晶（Liquid Crystal on Silicon，LCOS）调制器的抖动差异显著，最高可达67.64%，但经OASLM调制后，读出光束的抖动可被有效抑制至2%以下。此外，该器件在饱和工作区展现出高度一致且可靠的稳定性。基于寻址光调制链路的分析显示，像素聚合与时域低通滤波可大幅衰减抖动传输；而高电场下液晶层的电光饱和响应，进一步降低了系统对外部扰动的敏感度。上述研究结果为高稳定性OASLM的设计与优化提供了理论指导与实验支撑，同时为惯性约束聚变、高分辨率成像等先进光子学应用提供了极具价值的参考思路。