光折变晶体中多重全息图分批定影热固定的研究

A study on the batch method of thermal fixing for multiplexed photorefractive holograms

首次描述了多重全息图分批定影热固定的记录—补偿—多次光擦除及平滑—显影的存储固定机制 ,并据此对分批存储定影过程中的全息电子光栅和离子光栅的行为进行了详细理论分析。研究结果表明 ,多次光擦除平滑阶段中获陷电子对离子光栅的屏蔽作用所引起的光擦除减缓效应 ,是分批定影热固定法能够有效提高多重全息图固定后衍射效率的根本原因。

We investigated systematically the batch method of thermal fixing of multiplexed holograms.We have pictured and analyzed,for the first time to our knowledge,the batch fixing process.The behaviors of both electronic and ionic gratings are discussed in detail,which include optical erasure of electronic gratings by subsequent recordings both in the same batch and in different batches,ionic compensation during thermal fixing in one batch,smoothing of ionic gratings during thermal fixing of subsequent batches,and revealing of fixed ionic gratings.The result shows that,by fixing in batches,the screening effect of trapped electrons on ionic gratings reduces optical erasing,and hence, enhances the fixed diffraction efficiency of multiplexed holograms.