光折变全息存储中消散射噪音的研究

通常光折变全息存储中用原记录时的参考光再现时,透过光折变晶体的散射光会降低再现图象的质量.我们在实验中对这种影响进行了研究,发现信噪比低的再现象是由信号-嗓音混合栅产生的相位畸变波.我们用参考光的相位共轭光作为再现光,有效地降低了再现象中的噪音,获得了高信噪比的再现图象.基于光折变波耦合理论,我们得到了和实验结果相符合的理论结果.

REDUCING SCATTERING NOISE IN HOLOGRAPHIC STORAGE IN PHOTOREFRACTIVE MEDIA

The scattering light transmitted photorefractive crystal usually degrade the quallity of reconstructed image by using reference beam. We have investigated this effect exprimentally and found that this poor quality reconstructed image is created from phase-distortion signal wave which is produced by the signal-noise mixing grating. The scattering noise in the reconstructed image can be reduced by phase-conjugated reference light and the high-fidelity reconstructed image is obtained in our expriment. The exprimental results are in excellent agreement with the theoretical prediction.