Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Patent
1986-09-25
1988-07-26
Psitos, Aristotelis M.
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
369112, 369120, 369 46, 350 9611, G11B 700
Patent
active
047605685
ABSTRACT:
An optical head for a laser memory disk in accordance with the present invention comprises: a substrate (1); a waveguide layer (3) formed over a main surface of the substrate; a semiconductor laser (4) for injecting laser beams into the waveguide layer, the semiconductor laser being set in a hollow (17) dug down at least into the waveguide layer; a focusing grating coupler (6) formed on the waveguide layer for focusing the injected laser beams on the memory disk and introducing beams reflected back from the disk into the waveguide; beam splitter means (5) formed on the waveguide layer between the semiconductor laser and the focusing grating coupler, for bisecting each of the reflected beams at a prescribed acute angle; and photodetector means (10) for converting the bisected beams into electrical signals, the photodetector means being provided along both the sides of the semiconductor laser and situated not nearer to the focusing grating coupler as compared with the semiconductor laser.
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Electro-Optics-Technology Report-May 1986, pp. 56, 58, 60.
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"High-Performance Focusing Grating Coupler Fabricated by Electron-Beam Writing" T. Suhara et al., Technical Digest of Seventh Topical Meeting on Integrated and Guided-Wave Optics, ThD4, Florida, Apr. 24-26 (1984).
"Integrated Optical Photodetector", D. B. Ostrowsky, et al., Appl. Phys. Lett., vol. 22, No. 9, 1 May 1973, pp. 463-464.
Mitsubishi Denki & Kabushiki Kaisha
Psitos Aristotelis M.
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