Invention Grant
- Patent Title: Only-readable three-dimensional optical storage device
- Patent Title (中): 只能读取三维光存储设备
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Application No.: US09875947Application Date: 2001-06-08
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Publication No.: US06738337B2Publication Date: 2004-05-18
- Inventor: Jingjun Xu , Qian Sun , Xinzheng Zhang , Hui Huang , Qiang Wu , Baiquan Tang , Haijun Qiao , Guangyin Zhang , Zuojin Sha
- Applicant: Jingjun Xu , Qian Sun , Xinzheng Zhang , Hui Huang , Qiang Wu , Baiquan Tang , Haijun Qiao , Guangyin Zhang , Zuojin Sha
- Priority: CN00121095A 20000720
- Main IPC: G11B700
- IPC: G11B700

Abstract:
The invention relates to the information storage. It consists of a computer, a precise rotary table, a writing laser source, a readout laser source, a spatial filter, a spatial light modulator, lens, mirrors, photorefractive crystals (such as doubly doped lithium niobate), and a phase-mismatch adjustor; Due to used a green light (532 nm) as the writing light, and a red light (670 nm) as the readout light, the signal-to-noise ratio is improved greatly and the problem of fixing the stored information is solved. The transmission configuration is used to realize the high-density digital storage in which the irregular lens is designed to work as a phase-mismatch adjustor and read out the whole stored image with no distortion and loss. The dynamically differential encoding and decoding technique is used to suppress the bit-error-rate to lower than 10−6.
Public/Granted literature
- US20020018429A1 Only -readable three-dimensional optical storage device Public/Granted day:2002-02-14
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