基于数字闪耀光栅的位相全息图光电再现优化  

Optimization of optoelectronic reconstruction of phase hologram by use of digital blazed grating

作　　者：于瀛洁[1] 王涛[1] 郑华东[1] 

机构地区：[1]上海大学精密机械工程系,上海200072

出　　处：《物理学报》2009年第5期3154-3160,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:60772124);上海市科委科技攻关计划(批准号:075115001);上海大学研究生创新基金(批准号:Shucx080215)资助的课题~~

摘　　要：针对利用液晶空间光调制器(LC-SLM)进行全息图光电再现过程中,再现像面存在多级衍射像造成单一像能量利用率低的问题,提出了一种在位相全息图中加载数字闪耀光栅的方法,以提高全息图光电再现中单一衍射像的衍射效率.分析了闪耀光栅作为衍射光学元件的特性及其对光波进行位相调制的原理,并阐述了在LC-SLM中加载数字闪耀光栅对位相全息图光电再现时像面能量分布的影响.搭建了基于LC-SLM的位相全息图光电再现实验系统.理论分析表明:在其他条件不变的情况下,加载竖直(或水平)槽向周期为2pixels的数字闪耀光栅可使单一衍射像的能量提高130.2%;而加载竖直及水平槽向周期均为2pixels的数字闪耀光栅可使单一衍射像的能量提高429.7%.实验结果验证了该方法可有效地提高单一衍射像的能量,改善了全息再现系统的光能利用效率.The utilization efficiency of light energy is affected by the muhi-order images during the reconstruction of holograms based on liquid erystal spatial light modulator （LC-SLM）, which leads to the low intensity of single image. A novel method is proposed to improve the diffraction efficiency of single reconstructed image by synthesizing phase hologram and digital blazed grating. The property and principle of wave-front modulation are analyzed by use of digital blazed grating as diffractive optical element （DOE）. The effect of digital blazed grating on the reconstructed image of phase hologram by use of LC-SLM is also described. Holographic optoelectronic display system based on LC-SLM is set up for phase hologram reconstruction. Theoretical analysis shows that, the intensity of single reconstructed image is increased by 130.2 per cent by adding digital blazed grating with period of 2 pixels in vertical or horizontal direction, and 429.7 per cent with the same period of digital blazed grating in vertical ＆ horizontal directions. The experimental result also verifies that, by the proposed method, the energy intensity of single reconstructed image is increased and the utilization efficiency of light energy is improved.

关 键 词：全息光电再现 位相全息图 数字闪耀光栅 液晶空间光调制器 

分 类 号：O438.1[机械工程—光学工程]