液晶器件作为全息记录介质的参数研究

Parameters study of liquid crystal device as holographic recording medium

利用空间光调制器液晶器件(LCD)代替全息干板实时再现全息图像.LCD的相对低分辨率对全息再现像质产生一定影响.以菲涅尔全息为例,分析了LCD空间分辨率和全息条纹频率之间的关系.为保证衍射再现像分离、充分利用LCD带宽和提高系统分辨率,讨论了计算全息对参考光角度、物体尺寸和物体计算距离的要求,得到了参数的合理取值范围,并比较了在不同参数下的实际再现结果,验证了理论分析的正确性.

Spatial light modulator instead of photosensitive plates was used to realize real-time holographic display. The lower resolution of liquid crystal device （LCD） affected the quality of reconstructed images. The relationship between the resolution of LCD and the frequency of holographic fringe in the Fresnel com- puter-generated hologram （CGH） was demonstrated. In view of separation of diffractive images, sufficient use of LCD＇s bandwidth and improvement of system＇s resolution, the selective ranges for the parameters in CGH were obtained, including reference light angle, digital object size and distance between object and holographic plane. The recorded reconstructed images with different parameters proved the correctness of the theoretical analysis.