反射式液晶光阀用于激光束空间整形可行性研究
Feasibility study of liquid crystal light valve on beam-shaping
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摘要: 从理论和实验两方面对一种反射式液晶光阀（LCOS）的调制特性进行了研究。着重研究了在高功率激光系统中，反射式液晶光阀作为空间整形器件面临的一些应用问题，特别是它的各种调制特性、整形能力以及对于光束质量的影响。研究发现，与透射式液晶光阀相比，反射式液晶光阀有着明显的优势，效率达到42%，远远优于透射式液晶光阀10%的效率，从而能够实现系统的大幅度简化，是一种非常有潜力的空间光调制器件。Abstract: A novel method of beam shaping by liquid crystal light valve (LCOS) is introduced in this paper. The incident phase modulation and spatial transmission properties of a shaped beam are studied, as well as the modulation characteristics of the liquid crystal light valve. There is no any additional phase modulation on the shaped beam when a LCOS is used as the beam shaper. A Gaussian beam has successfully been converted to a square flattop super-Gaussian beam by use of a LCOS. The results show that the LCOS of a liquid crystal projector working as a programmable spatial light amplitude modulation is feasible. An efficiency of 42% can be achieved.
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