发明名称 |
Holographic medium, holographic storage method and system, holographic retrieval method and system. |
摘要 |
<p>A holographic medium comprising an optical waveguide including at least one core layer (1) positioned between portions having a lower refractive index; a diffraction grating layer (10; 3) formed at a boundary between the core layer and the above portions or in the core layer; and a storage layer (4) outside the optical waveguide. An optical waveguide having the above structure in which the diffraction efficiency of the diffraction grating layer has a specific distribution is useful. In multiple-angle storage, a reference beam is emitted from an end face of a core layer or from the upper or lower side of the medium and a photodetector may be used, so as to control the incident angle. The reference beam and/or the optical waveguide is moved so that the reference beam couples only with a specific diffraction grating layer. The object beam may be focused onto a small target area of the storage layer.</p> |
申请公布号 |
EP1271266(B1) |
申请公布日期 |
2011.10.05 |
申请号 |
EP20020291538 |
申请日期 |
2002.06.20 |
申请人 |
NIPPON TELEGRAPH AND TELEPHONE CORPORATION |
发明人 |
YOSHIKAWA, HIROSHI;ANDOH, YASUKO;ITOH, KEIICHIRO;SENDA, MASAKATSU;KUROKAWA, YOSHIAKI;TANABE, TAKAYA |
分类号 |
G03H1/26;G02B6/12;G02B6/34;G11B7/0065 |
主分类号 |
G03H1/26 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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