双光子吸收光致变色三维光存储实验研究

Experimental Study on Photochromic Three-Dimensional Optical Storage under Two-Photon Absorption

介绍了双光子吸收光致变色光存储的存储原理,利用单光束双光子吸收三维光存储和反射式荧光共焦扫描 读出实验装置,分别进行了写入激光功率、曝光时间和存储深度不同时双光子吸收光致变色三维光信息存储特性 (读出信号强度和存储点尺寸)的实验研究。结果表明,读出信号强度主要取决于写入时的激光功率和曝光时间。 读出信号强度在激光功率较低时与写入激光功率的平方成正比,而当写入激光功率大于一定值时,读出信号强度 达到了饱和。读出信号强度随着曝光时间的增加也明显地呈现出饱和效应。此外,读出信号强度随着存储深度的 增加明显地减弱了。存储点尺寸随着写入激光功率的增大、曝光时间的增长也迅速增大。较高的写入激光功率和 较短的曝光时间有利于信息的高速存储。

The storage mechanism of photochromic three-dimensional optical storage under two-photon absorption is presented. The experiments on the effect of writing power, exposure time and recording depth on the contrast of the readout signal intensity and bit size were carried out by use of three-dimensional optical memory setup with single-beam two-photon and a reflection confocal scanning readout setup. The results show that the signal intensity and the bit size of the recorded bits depend strongly on the writing power and exposure time. The signal intensity initially shows an I2 dependence on power, followed by saturation. The saturation effect is also evident as exposure time is longer. Bit size is increased with writing power or exposure time increased. Furthermore, signal intensity is decreased with an increase in recording depth. Storage rate is higher by use of higher power and shorter exposure time.