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.