液晶空间光调制器用于波前校正的性能

蔡冬梅; 姚军; 姜文汉

光学学报, 2009, 29 (2): 285, 网络出版: 2009-02-23

液晶空间光调制器用于波前校正的性能

Performance of Liquid-Crystal Spatial Light Modulator Using for Wave-Front Correction

论文大纲

蔡冬梅 ^1,2,*姚军 ¹姜文汉 ¹

作者单位

¹ 中国科学院光电技术研究所微细加工光学技术国家重点实验室, 四川成都 610209

² 太原理工大学应用物理系, 山西太原 030024

自适应光学液晶空间光调制器波前校正 adaptive optics liquid-crystal spatial light modulator wave front correction

摘要

液晶空间光调制器(Liquid crystal spatial light modulator, LC-SLM)作为新型波前校正器具有驱动单元数目多、驱动电压低、控制灵活、价格低廉等优点。通过对LC-SLM时间-空间特性的研究, 讨论其在天文观测自适应光学系统中应用的可能性和局限性。利用LC-SLM和哈特曼波前传感器构成自适应光学系统, 对低频为主的静态波前像差实现闭环校正。闭环校正后的RMS 值和PV 值由闭环前的0.628λ、2.872λ 减小为0.031λ 、0.337λ, Strehl 比从0.04提高到近似衍射极限的0.81。利用衍射原理, 对LC-SLM的衍射效率进行了数值计算和实验测量。研究表明, LC-SLM能对大气湍流引入的光波畸变实现高精度校正; 然而响应速度慢、光能利用率低限制了它目前在实际自适应系统中的使用, 不能满足实时校正的要求、以及对微弱目标的应用。

Abstract

Liquid-crystal spatial light modulator (LC-SLM) has the attractive advantages of large number of correcting elements, low applied voltage, easy control and low cost etc. as an emerging wave-front corrector. Based on the investigation of its time-space characteristics, the capability and limitations of LC-SLM in adaptive astronomical imaging application systems were discussed. An adaptive optical system with a LC-SLM and a Shack-Hartmann sensor was close-looped. As a result, a static aberration, which is mainly composed of low order aberrations, was corrected. RMS value and PV value after closed-loop correction are reduced from 0.628λ, 2.872λ to 0.031λ and 0.337λ, with a Strehl ratio improvement from 0.04 to near diffraction-limited of 0.81. Apart from that, the diffraction efficiency of LC-SLM was calculated and measured. From the result, LC-SLM is capable of correcting atmosphere turbulence nicely. However, Low optical efficiency and response speed are huge drawbacks to limit LC-SLM in a practical adaptive optical system to correct atmospheric aberration in real time and using for faint object.

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蔡冬梅, 姚军, 姜文汉. 液晶空间光调制器用于波前校正的性能[J]. 光学学报, 2009, 29(2): 285. Cai Dongmei, Yao Jun, Jiang Wenhan. Performance of Liquid-Crystal Spatial Light Modulator Using for Wave-Front Correction[J]. Acta Optica Sinica, 2009, 29(2): 285.

液晶空间光调制器用于波前校正的性能

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