利用YAG激光器二倍频532 nm连续激光作为记录光，连续单色光作为读出光，在细菌视紫红质(BR D96N)材料上进行了图像写/读实验。通过理论分析BR D96N膜所记录的图像对比度随读出光波长变化趋势，得到图像对比度变化曲线，并通过实验方法验证。实验结果表明，在BR D96N膜基态峰(570 nm)附近550 nm波长处，可获得最佳的图像对比度(～1.63:1)；在亚稳态(M态)吸收带内(390～450 nm)，图像出现反转现象。

The 532 nm light of YAG laser is used as recording light and the monochromatic-light is used as the readout light. At the different wavelength, the changed tendency of the image contrast based on the BR D96N thin film is observed. Using the method of the gray integration of the image, the contrast curve of the recorded image is achieved. All the results show that a maximum image contrast of ～1.63∶1 is obtained in the peak absorption region of the B-state (～570 nm) and the reverse images are obtained in the absorption region of the M-state (390～450 nm).