Holographic elements for an optical recording system
DCFirst Claim
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1. Apparatus for controlling at least one beam of light in an optical data storage system comprising:
- a) a light source; and
b) a multi-function volume holographic optical element (HOE) in a raypath of light from said light source, said holographic optical element adapted to perform a plurality of optical functions selected from the group of generating servo error signals, generating a focus error signal, generating a tracking error signal, collimation, beam shaping, beam splitting, and combining at least two beams.
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Abstract
An optical recording, erasing and playback system. One or more functions in a conventional optical disc system are performed by one or more holographic optical elements (HOE). Exemplary of the functions performed by the HOE are collimation, beam shaping, combining of beams, and focusing. According to preferred embodiments, volume HOEs are utilized.
46 Citations
19 Claims
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1. Apparatus for controlling at least one beam of light in an optical data storage system comprising:
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a) a light source; and b) a multi-function volume holographic optical element (HOE) in a raypath of light from said light source, said holographic optical element adapted to perform a plurality of optical functions selected from the group of generating servo error signals, generating a focus error signal, generating a tracking error signal, collimation, beam shaping, beam splitting, and combining at least two beams. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An optical, digital data system comprising:
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a) a divergent light source; b) a light sensitive element; and a multi-function volume holographic element (HOE), said volume HOE positional in a lightpath of said light source, so as to focus light from said light source on an optical data storage medium and to focus light reflected from said optical data storage medium on said light detection element.
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17. An optical digital data system comprising:
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a) first and second divergent light sources; b) a multi-function volume holographic optical element (HOE), said volume HOE positioned in a lightpath between said first and second light sources, and an optical data storage media to; i) combine beams from said first and second divergent light sources; and ii) collimate light from said first and second light sources. - View Dependent Claims (18, 19)
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Specification