Only-readable three-dimensional optical storage device
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United States of America Patent
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May 18, 2004
Grant Date -
Feb 14, 2002
app pub date -
Jun 8, 2001
filing date -
Jul 20, 2000
priority date (Note) -
Expired
status (Latency Note)
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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.sup.-6.
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