CAJ | 학술논문

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0.6 dB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5 dB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.
채용수치모의방법연구료불동충류삼고광파면질량대재현도상질량적영향.침대전식실험실제정황,대이치도상건립료부리협변환전식도기록화독출적물리모형,분별고찰채용일반평면파삼고광、고사광속구면파삼고광화산반삼고광시적독출도상질량,병이신조비손실작위형량도상질량적정량공구.모의결과표명,재이상평면파삼고광화구면파삼고광적정형,전식독출도상질량비상호,여수입도상상비신조비손실재0.6 dB이하.단시대우산반삼고광,진관기겁우적위이선택성제공료고밀도존저적가능성,단재현도상질량명현변차,신조비손실재5 dB이상,실현유효적수거존저위밀도장시십분곤난적.위료겸고존저밀도화재현질량,응해고필우화삼고광적도경.
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.