SPATIAL LIGHT MODULATORS WITH CHANGEABLE PHASE MASKS FOR USE IN HOLOGRAPHIC DATA STORAGE
First Claim
Patent Images
1. A write head for a holographic data storage system, the write head comprising:
- a spatial light modulator that is arranged into an array of pixels that can each separately modulate light that is directed toward the spatial light modulator; and
a phase mask that is capable of varying the phase of light passing therethrough, the phase variation being dependent on the particular portion of the phase mask that the light passes through;
wherein the phase variation of at least a portion of the phase mask can be changed over time.
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Abstract
A holographic data storage system that includes a write head that includes a pixellated spatial light modulator and a separate or integral phase mask that varies the phase depending on the location in the phase mask that light passes through. The phase variation can be changed over time in a random, pseudo-random, or predetermined fashion. The spatial light modulator and phase mask can be implemented in a liquid crystal SLM (nematic, ferroelectric, or other), in a DMD SLM, in a magneto-optical SLM, or in any other suitable manner.
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Citations
35 Claims
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1. A write head for a holographic data storage system, the write head comprising:
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a spatial light modulator that is arranged into an array of pixels that can each separately modulate light that is directed toward the spatial light modulator; and
a phase mask that is capable of varying the phase of light passing therethrough, the phase variation being dependent on the particular portion of the phase mask that the light passes through;
wherein the phase variation of at least a portion of the phase mask can be changed over time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A write head for a holographic data storage system, the write head comprising:
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a spatial light modulator that is arranged into an array of pixels that can each separately modulate light that is directed toward the spatial light modulator and that can vary the phase of light passing therethrough, the phase variation being dependent on the pixel that the light passes through;
wherein the phase variation of at least a portion of the pixels can be changed over time. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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- 33. A write head for a holographic data storage system, the write head comprising a spatial light modulator having an array of pixels, each of the pixels in the array being independently switchable between a high optical throughput state and a low optical throughput state in response to data supplied thereto, each of the pixels in the high optical throughput state further being switchable between a first optical phase state and a second optical phase state in a predetermined fashion in accordance with the supplied data.
Specification