液晶可变延迟器的双折射色散研究  

Study of Birefringence Dispersion Based on Liquid Crystal Variable Retarder

作　　者：李克武[1,2] 王志斌[1,2] 张瑞[1,2] 于慧[2] 

机构地区：[1]中北大学仪器科学与动态测试教育部重点实验室,山西太原030051 [2]中北大学山西省光电信息与仪器工程技术研究中心,山西太原030051

出　　处：《中国激光》2015年第1期224-230,共7页Chinese Journal of Lasers

基　　金：国际科技合作项目(2012DFA10680);国家自然科学基金仪器专项基金(61127015)

摘　　要：为了实现液晶可变延迟器(LCVR)对不同波长入射光相位延迟的精确控制,发挥其在光信息和光学测量领域的应用优势,对其双折射色散特性进行了研究分析。根据折射率椭球理论分析了LCVR对入射光的双折射色散满足柯西色散关系;分别测量了LCVR对532、635、670 nm激光在不同驱动电压值下的延迟量;讨论和分析上述测量结果,求解出LCVR满足的柯西色散经验公式的系数,利用归一化的方式确立了色散定标方法,并用650 nm激光进行了实验验证。实验结果表明,LCVR对不同波长的入射光存在双折射色散;650 nm激光延迟量的实测值与双折射色散定标值偏差不大于0.007λ,定标方法准确可行。In order to realize a liquid crystal variable retarder （LCVR） to precisely control the phase delay for different wavelengths of the incident light and expand its application advantages in the field of optical information and optical measurements, its birefringence dispersion characteristics are studied and analyzed. Firstly, according to the index ellipsoid theory, LCVR birefringence dispersion of the incident light is matched with Cauchy dispersion; Secondly, retardance for 532, 635, 670 nm laser is measured, which changes with the value of drive voltage; Finally, the above three measurements are analyzed, the coefficients about empirical formula of Cauchy dispersion are solved, and a calibration method of dispersion used a normalizing way is established and verified with a 650 nm laser. Experimental results show that LCVR produces birefringence dispersion for different wavelength incident light. For 650 nm laser, the retardance deviation between experimental result and dispersion calibration is given not more than 0.007λ , which proves the calibration method is accurate and feasible.

关 键 词：物理光学 液晶可变延迟器 双折射色散 延迟量定标 

分 类 号：O436[机械工程—光学工程]