Two-color holographic recording apparatus
AssigneesDirector General of National Institute for Research in Inorganic Materials, Science and Technology Agent, Pioneer Corporation
InventorsMyeongkyu Lee, Kenji Kitamura, Yasunori Furukawa, Shunji Takekawa, Yoshihisa Ito, Hideki Hatano, Satoru Tanaka
Life of this patent
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Abstract
A two-color holographic recording apparatus reduces error signals possibly included in reproduced digital data signals. The two-color holographic recording apparatus has first, second and third light shutters for passing or blocking gate light, signal light and reference light incident on a recording medium respectively, and a controller for controlling the respective states of the first, second and third light shutters.
Claims14
A two-color holographic recording apparatus for impinging interferable signal light and reference light onto a recording medium, which has been irradiated with gate light to be optically stimulated to a metastable state, to record information signals carried by the signal light, said apparatus comprising:
- first, second, and third light shutters for passing and blocking said signal light, reference light, and gate light, respectively when open and closed, respectively;
- and
- control means for controlling respective states of said first, second, and third light shutters.
A holographic recording apparatus, comprising:
- a recording medium;
- a first light source producing a signal light irradiated along a signal light optical path onto a first position on the recording medium and a reference light irradiated along a reference light optical path onto the first position on the recording medium to record a signal carried by the signal light;
- a second light source producing a gate light irradiated along a gate light optical path onto a region of the recording medium including the first position to optically stimulate the recording medium from a base state to a metastable state to allow recording of signals;
- a first shutter selectively opening and closing to unblock and block, respectively, the signal light optical path;
- a second shutter selectively opening and closing to unblock and block, respectively, the reference light optical path;
- and
- a third shutter selectively opening and closing to unblock and block, respectively, the gate light optical path.
A method of manipulating information with a holographic recording system comprising a recording medium, a signal light, a reference light, and a gate light, and a first shutter, a second shutter, and a third shutter selectively opening and closing to unblock and block, respectively, an optical path of the signal light, the reference light, and the gate light, respectively, the method comprising:
- closing the first shutter, the second shutter, and the third shutter;
- activating the signal light, the reference light, and the gate light;
- opening the third shutter to allow the gate light to irradiate a region of the recording medium containing a first position to optically stimulate the recording medium from a base state to a metastable state to allow recording of signals;
- opening the first shutter and the second shutter to allow the signal light and the reference light to irradiate the first position on the recording medium to record a signal carried by the signal light;
- closing the third shutter;
- and
- closing the first shutter and the second shutter.
Dependencies are inferred from the claim text.