Holographic memory read by a laser array
First Claim
1. A holographic memory system for reading a holographic recording medium recorded with angularly multiplexed pages of information, comprising:
- a two-dimensional array of surface-emitting lasers formed on an integrated circuit chip;
means for activating a selected one of said lasers to produce a coherent optical output beam; and
a collimating lens system for collimating said output beam produced by any of said activated lasers to fall upon an entire area of said recorded holographic medium at an incident angle dependent upon which of said lasers has produced said output beam.
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Accused Products
Abstract
A holographic memory read-out system in which multiple pages of information are angularly multiplexed onto a recording medium, either planar or volume. For read-out of the hologram, a selected one of a plurality of surface-emitting semiconductor lasers arranged in a two-dimensional array is activated. The coherent output beam is passed through a collimating lens which produces a coherent plane-wave having a direction dependent upon which laser in the array produced the output beam. The plane-wave uniformly irradiates the recording medium to thereby diffract a selected image at a set angle to an imaging apparatus.
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Citations
9 Claims
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1. A holographic memory system for reading a holographic recording medium recorded with angularly multiplexed pages of information, comprising:
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a two-dimensional array of surface-emitting lasers formed on an integrated circuit chip; means for activating a selected one of said lasers to produce a coherent optical output beam; and a collimating lens system for collimating said output beam produced by any of said activated lasers to fall upon an entire area of said recorded holographic medium at an incident angle dependent upon which of said lasers has produced said output beam. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification