液晶光阀的电光色散特性研究

分析液晶光阀(LCLV)的电光色散特性，重点研究扭曲向列型液晶光阀TB3639的电光色散特性。在温度为27 ℃时, 将TB3639液晶光阀置于频率为1 000 Hz的交流电场中，测出电光特性T-λ曲线，同时得到不同波长的T-V电光特性曲线，确定对比度与光波波长的函数关系k(λ),并得出电光色散特性关系曲线k(λ)～λ。分析结果表明, TB3639液晶光阀在可见光区域，具有相对较高的对比度，其色散较小。波长在450～750 nm区域其对比度均大于0.8;其中波长在550～670 nm区域其对比度变化不大，均大于0.95，其色散最小。

Study on Photoelectric Dispersion Characteristic of Liquid Crystal Light Valve

The electro-optical properties and dispersion characteristics of a liquid crystal light valve (LCLV) were investigated. A 90 degrees twisted light valve (model TB3639) was used as a typical LCLV in the authors' experiment. At 27 degrees C and a fixed frequency of 1000 Hz, the transmitted light intensities (T) of the LCLV were measured as a function of wavelength (lamda) at different applied voltages. From the measured T-lamda curves, the dependence of contrast ratio k on the wavelength can be derived. The authors' results showd that the TB3639 LCLV has a comparatively high contrast ratio and low dispersion within the visible region. In the range of 450-750 nm, the contrast ratio, with its value higher than 0.8, does not change much with the wavelength. Particularly the contrast ratio is higher than 0.95 with a minimum dispersion in the range of 550-670 nm.