全息存储用光致聚合物材料的暗增长现象研究

根据光致聚合物中光栅形成机制,应用数学模型与实验相结合的方法,研究了一种新型光致聚合物在全息记录中的暗增长现象.研究表明,应用不同写入光强使衍射效率达到相同的饱和程度后,前期的写入光较弱则对应后期的暗增长程度较强.为了利用暗增长过程提高衍射效率,设计并实施了非连续曝光实验,使曝光与暗增长过程交替进行.并且通过暗增长过程的实验数据拟合出该材料的扩散时间常量为21 s,据此设定非连续曝光的周期.结果表明,相同记录条件下,非连续曝光比连续曝光可以获得更高的衍射效率.

Study on Dark Enhancement in Holographic Photopolymer

According to the mechanism of grating formation in photopolymers,the dark enhancement was investigated for a novel photopolymer by using the method of mathematic model combine with experimental measurements.The result indicates that the weaker intensity of writing light resulted in more dark enhancement,even though the same saturation was reached for diffraction efficiency with different writing intensity.In order to exploit this effect to enhance diffraction efficiency,experiments of non-continuous holographic exposure were designed and conducted,The diffusion time constant of the material was obtained to be 21 s by fitting the experimental data of dark enhancement with theoretical model.Based on the measured diffusion time constant,the period of non-continuous holographic exposure was determined.The experimental result indicates that the diffraction efficiency of a non-continuously exposure is higher than that of continuously one in the same recording condition.