| 摘要 |
An optical apparatus for reading from and writing to an ultra high density disk and comprising a light source emitting a pencil of light rays to an optical path along an optical axis; two interferometers, a beamsplitter, a quarter-wave plate, and an objective lens. The pencil of light rays is transmitted through the apparatus to become a narrow fringe ring which in turn is used to generate an ultra small spot of light. The resulting ultra small spot of light can address far more storage locations per a same unit area than a conventional much larger spot of light.
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