为解决光寻址液晶光阀在高功率密度光束控制领域的应用限制，介绍一种可用于高功率密度激光系统的光寻址液晶光阀，该光阀开关比不低于140∶1，可在高于2300 W/cm²的连续激光系统中正常工作。同时，所研制的光阀可在高重频吉瓦（GW）级功率密度的fs脉冲激光系统中正常工作，在该系统最大功率密度激光作用下，光阀未见明显温度变化，该脉冲激光系统最大平均功率密度超过300 W/cm²。

In this paper, the feasibility of a high laser damage threshold liquid crystal spatial light modulator based on gallium nitride (GaN) transparent conductive electrodes is proved. The laser-induced damage threshold (LIDT) is measured, and a high LIDT reflective optically addressed liquid crystal light valve (OALCLV) based on GaN is designed and fabricated. The proper work mode of the OALCLV is determined; the OALCLV obtained a maximum reflectivity of about 55% and an on–off ratio of 55:1, and an image response is demonstrated.

In this paper, we propose an effective method to compensate for the performance degradation of optically addressed spatial light modulators (OASLMs). The thermal deposition problem usually leads to the on-off ratio reduction of amplitude OASLM, so it is difficult to achieve better results in high-power laser systems. Through the analysis of the laser-induced temperature rise model and the liquid crystal layer voltage model, it is found that reducing the driving voltage of the liquid crystal light valve and increasing the driving current of the optical writing module can compensate for the decrease of on–off ratio caused by temperature rise. This is the result of effectively utilizing the photoconductive effect of Bi₁₂SiO₂₀ (BSO) crystal. The experimental results verify the feasibility of the proposed method and increase the laser withstand power of amplitude-only OASLM by about a factor of 2.5.