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利用光致变色材料的灰度分阶特性可以实现多阶光存储。以傅里叶光学和光致变色记录符的可叠加性为基础,采用霍普金斯标量衍射理论的经典归一化坐标,对光致变色多阶光存储中的光学串扰进行了理论建模和数值分析,作为后续电通道补偿设计的前提。数值计算结果表明:相邻记录符与盘基信号的交叉串扰项是光学串扰的主要成分,且随着中心距的增加,相邻记录符引起的串扰迅速降低;当无寻道误差时,邻道记录符引起的串扰可以忽略;高阶记录符引起串扰要明显高于低阶的串扰,且影响多阶存储的可分阶性;实验结果很好地验证了所建立的模型的合理性。
Multi-order optical storage can be realized by using the gradation characteristics of photochromic materials. Based on the stackability of Fourier optics and photochromic record, the optical crosstalk in photochromic multi-order optical storage is theoretically modeled using classical normalized coordinates of Hopkins scalar diffraction theory and Numerical analysis, as the premise of the follow-up electric channel compensation design. The numerical results show that the crosstalk between the adjacent record and the disc-based signal is the main component of optical crosstalk. As the center distance increases, the crosstalk caused by the adjacent record rapidly decreases. When there is no seek error, The crosstalk caused by the track record can be neglected. The crosstalk caused by the high-order record is significantly higher than that of the low-order crosstalk, and the scalability of multi-stage memory is affected. The experimental results verify the rationality of the established model.