Development of optically addressed liquid crystal light valve for high power density beam control
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摘要: 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。Abstract: As a beam control device, optically addressed liquid crystal light valve is easy to produce thermal effect due to absorption under the action of high-power density laser, resulting in damage to photoconductive materials, conductive films and liquid crystals. At the same time, thermal effect will also affect the uniformity of the device, reduce the extinction performance of the device. These factors limit the application of the device in laser processing, high power density laser shaping and other fields. To solve the application limitation of optically addressed liquid crystal light valve in the field of high power density beam control, an optically addressed liquid crystal light valve for high power density laser system is developed. The on/off ratio of the light valve is not less than 140∶1. It can work normally in the continuous laser system higher than 2300 W/cm2. At the same time, the light valve can work normally in the femtosecond pulse laser system with high repetition frequency gigawatt power density. Under the action of the maximum power density laser of the system, the light valve has no obvious temperature change. The maximum average power density of the pulse system exceeds 300 W/cm2.
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图 1 光阀器件示意图
Figure 1. Schematic diagram of optically addressed liquid crystal light valve
图 2 光寻址光阀的等效电路
Figure 2. Equivalent circuit of optically addressed liquid crystal light valve
图 3 光照与未光照部分分压情况关系图
Figure 3. Voltage relationship between illuminated part and non-illuminated part
图 6 实验与模拟分压系数对比图
Figure 6. Comparison diagram of voltage coefficient between experiment and simulation
图 9 高功率密度连续激光作用下的热成像图及温升曲线
Figure 9. Thermal imaging diagram and device temperature under the action of high power density continuous laser
图 10 高功率密度激光作用引起温度变化对调制曲线的影响
Figure 10. Effect of temperature change on the modulation curve caused by the action of high power density laser
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