参考光波面质量对全息存储质量影响的数值模拟研究  

Influence of Wavefront Quality of Reference Beam on Hologram Storage by Numerical Simulation

作　　者：宋伟[1] 陶世荃 王焕勇[1] 

机构地区：[1]北京工业大学应用数理学院,北京100124

出　　处：《光子学报》2010年第3期513-517,共5页Acta Photonica Sinica

基　　金：国家自然科学基金(60477004);北京市自然科学基金(4071001)资助

摘　　要：采用数值模拟方法研究了不同种类参考光波面质量对再现图像质量的影响.针对全息实验实际情况,对二值图像建立了傅里叶变换全息图记录和读出的物理模型,分别考察采用一般平面波参考光、高斯光束球面波参考光和散斑参考光时的读出图像质量,并以信噪比损失作为衡量图像质量的定量工具.模拟结果表明,在理想平面波参考光和球面波参考光的情形,全息读出图像质量非常好,与输入图像相比信噪比损失在0.6dB以下.但是对于散斑参考光,尽管其极优的位移选择性提供了高密度存储的可能性,但再现图像质量明显变差,信噪比损失在5dB以上,实现有效的数据存储位密度将是十分困难的.为了兼顾存储密度和再现质量,应该考虑优化参考光的途径.The influence of wavefront quality of reference beams on the reconstruction quality of holographic recordings is investigated by numerical simulation.A physical model of recording and readout of Fourier transform holograms is built up to study reconstruction quality with various reference waves such as general plane wave,Gaussian wave and speckle wave.The quality is quantitatively evaluated using the loss of signal to noise ratio（LSNR）of the readout images.The simulation results show that plane and Gaussian reference waves could successfully record and readout high-quality holographic images with LSNR lower than 0.6 dB,but the speckle reference led to quality deterioration of reconstructed images with LSNR as high as 5 dB.It will be difficult to realize effective high-density data storage by speckle reference beam.In order to implement high-quality and high-density holographic storage,the reference beam must be optimized.

关 键 词：全息存储 复用技术 散斑 

分 类 号：O438.1[机械工程—光学工程]