计算全息干涉实现防伪和信息的加密存储

Anti-counterfeiting and Encryption Storage of Information Using CGH Interference

提出一种位相编码计算全息干涉防伪术。这种方法用迂回位相法对光波进行位相编码，然后用这个编码的光波和另一由计算全息产生的参考光波干涉，从干涉图样中可以读出所记录的信息，没有参考计算全息图则无法读出记录的信息。这种计算防伪全息图的特点是设计灵活、使用方便、可由白光再现。具有很强的防伪力度。

An anti-counterfeiting method using CGH phase coding is presented in this paper.The phase of a wavefront is coded by means of detour phase coding and then interfere with a reference wave,which is also generated by CGH.The object recorded in the hologram can be read out from the interference patterns.The object can be easily generated by computer or using CCD camera,both black-white and gray-level object can be used in our method.The reference wave can be a plane wave or another phase coding wave,then it's difficult to duplicate an identical CGH,which make it enjoy a high anti-counterfeiting ability.