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US 2008/0291807 A1Published application
Hologram Record Carrier and Record Reproducing Method and System
AssigneePioneer Corporation
InventorsYoshihisa Itoh, Masakazu Ogasawara
Life of this patent
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Abstract
A hologram recording carrier is provided with a hologram recording layer that stores inside an optical interference pattern made by components of irradiated coherent reference light and signal light, as a diffraction grating; and a polarization selective reflection film that is arranged on an opposite side to a light irradiation plane of the hologram recording layer and reflects a second linear polarization component rotated from a first linear polarization component, without reflecting the first linear polarization component of incident light.
Claims16
A hologram recording carrier comprising:
- a hologram recording layer that stores inside an optical interference pattern made by components of irradiated coherent reference light and signal light, as a diffraction grating;
- and
- a polarization selective reflection film that is arranged on an opposite side to a light irradiation plane of the hologram recording layer and reflects a second linear polarization component rotated from a first linear polarization component, without reflecting the first linear polarization component of incident light.
A hologram recording method of a hologram recording carrier comprising a hologram recording layer that stores inside an optical interference pattern made by components of coherent reference light and signal light, as a diffraction grating, the method comprising the steps of:
- arranging a polarization selective reflection film on an opposite side to a light irradiation plane of the hologram recording layer, the polarization selective reflection film transmitting or absorbing a first linear polarization component of incident light, without reflecting the first linear polarization component, and reflecting a second linear polarization component rotated from the first linear polarization component;
- and
- causing a light beam including the second linear polarization component of the reference light and the signal light to be incident from the hologram recording layer into the polarization selective reflection film and to be reflected by the polarization selective reflection film.
A hologram reproducing method of a hologram recording carrier comprising a hologram recording layer that stores inside an optical interference pattern made by components of coherent reference light and signal light, as a diffraction grating, the method comprising the steps of:
- arranging a polarization selective reflection film on an opposite side to a light irradiation plane of the hologram recording layer, the polarization selective reflection film transmitting or absorbing a first linear polarization component of incident light, without reflecting the first linear polarization component, and reflecting a second linear polarization component rotated from the first linear polarization component;
- and
- causing a light beam including only the first linear polarization component of the reference light to be incident from the hologram recording layer into the polarization selective reflection film and to be transmitted or absorbed in the polarization selective reflection film.
A hologram recording and reproducing system comprising:
- a supporting part that detachably supports a hologram recording carrier comprising a hologram recording layer that stores inside an optical interference pattern made by components of irradiated coherent reference light and signal light, as a diffraction grating;
- a light source that emits the coherent reference light;
- a signal light generating part that includes a spatial light modulator for generating signal light by spatially modulating the reference light according to record information;
- and
- an interfering part that irradiates a light beam including the signal light and the reference light on the hologram recording layer, forms a region of diffraction grating by the optical interference pattern inside the hologram recoding layer, and generates reproduction light corresponding to the signal light by irradiating the reference light on the region of diffraction grating,
- wherein the hologram recording carrier further comprises a polarization selective reflection film that is arranged on an opposite side to a light irradiation plane of the hologram recording layer and reflects a second linear polarization component rotated from a first linear polarization component, without reflecting the first linear polarization component of the light beam, and
- the hologram recording and reproducing system further comprises a polarization variable means that rotates a polarization direction of the reference light to include the second linear polarization component in the light beam for recording and include only the first linear polarization component in the light beam for reproduction.
4 more elements
A hologram reproducing system comprising:
- a supporting part that detachably supports a hologram recording carrier comprising a hologram recording layer that stores inside an optical interference pattern made by components of irradiated coherent reference light and signal light, as a diffraction grating;
- a light source that emits the coherent reference light;
- and
- an interfering part that generates reproduction light corresponding to the signal light by irradiating the reference light on a region of diffraction grating,
- wherein the hologram recording carrier further comprises a polarization selective reflection film that is arranged on an opposite side to a light irradiation plane of the hologram recording layer and reflects a second linear polarization component rotated from a first linear polarization component, without reflecting the first linear polarization component of the reference light, and
- the hologram reproducing system further comprises a polarization variable means that rotates a polarization direction of the reference light to include only the first linear polarization component in the reference light.
3 more elements
A hologram recording and reproducing system comprising:
- a supporting part that detachably supports a hologram recording carrier comprising a hologram recording layer that stores inside an optical interference pattern made by components of irradiated coherent reference light and signal light, as a diffraction grating;
- a light source that emits the coherent reference light;
- a signal light generating part that includes a spatial light modulator for generating signal light by spatially modulating the reference light according to record information;
- an interfering part that irradiates a light beam including the signal light and the reference light on the hologram recording layer, forms a region of diffraction grating by the optical interference pattern inside the hologram recoding layer, and generates reproduction light corresponding to the signal light by irradiating the reference light on the region of diffraction grating;
- a polarization selective reflecting part that is arranged with a space formed on an opposite side to a light irradiation plane of the hologram recording layer and reflects a second linear polarization component rotated from a first linear polarization component, without reflecting the first linear polarization component of the light beam;
- and
- a polarization variable means that rotates a polarization direction of the reference light to include the second linear polarization component in the light beam for recording and include only the first linear polarization component in the light beam for reproduction.
4 more elements
A hologram reproducing system comprising:
- a supporting part that detachably supports a hologram recording carrier comprising a hologram recording layer that stores inside an optical interference pattern made by components of irradiated coherent reference light and signal light, as a diffraction grating;
- a light source that emits the coherent reference light;
- an interfering part that generates reproduction light corresponding to the signal light by irradiating the reference light on a region of diffraction grating;
- a polarization selective reflection film that is arranged with a space formed on an opposite side to a light irradiation plane of the hologram recording layer and reflects a second linear polarization component rotated from a first linear polarization component, without reflecting the first linear polarization component of the reference light;
- and
- a polarization variable means that rotates a polarization direction of the reference light to include only the first linear polarization component in the reference light.
3 more elements
Dependencies are inferred from the claim text.