The pattern recognition of 16 levels gray image with iterative exposure schedule in Zn:Fe:LiNbO<sub>3</sub>

Qingxin Meng; Yubin Gai; Yi Zhang; Suhua Luo; Xiudong Sun; Yongyuan Jiang

doi:10.1117/12.649645

15 September 2005 The pattern recognition of 16 levels gray image with iterative exposure schedule in Zn:Fe:LiNbO₃

Qingxin Meng, Yubin Gai, Yi Zhang, Suhua Luo, Xiudong Sun, Yongyuan Jiang

Proceedings Volume 5966, Seventh International Symposium on Optical Storage (ISOS 2005); 59660Z (2005) https://doi.org/10.1117/12.649645
Event: Seventh International Symposium on Optical Storage (ISOS 2005), 2005, Zhanjiang, China

Abstract

An iterative method designed by angle multiplexing holographic storage is introduced to determine exposure schedule for multiplexing storage in Zn(2mol.%):Fe(0.03wt.%):LiNbO₃ crystal. In this experiment, 60 holograms were recorded in the same location of the crystal with 2mJ/cm² incident exposure energy per hologram (0.7s exposure time at 2.8mW/cm² total incident intensity). And the self-correlation peaks of holograms were collected by CCD. We found that the cumulative grating strength of correlation peak versus exposure energy could be fitted to be a sixth-order polynomial, and made use of an iterative expression to calculate the exposure schedule for 60 holograms. The correlation recognition of 99 pictures with 16 levels gray is completed and the accuracy is 100%, while an appropriate exposure schedule is used to store the two-dimensional holograms.

Citation Download Citation

Qingxin Meng, Yubin Gai, Yi Zhang, Suhua Luo, Xiudong Sun, and Yongyuan Jiang "The pattern recognition of 16 levels gray image with iterative exposure schedule in Zn:Fe:LiNbO₃", Proc. SPIE 5966, Seventh International Symposium on Optical Storage (ISOS 2005), 59660Z (15 September 2005); https://doi.org/10.1117/12.649645

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