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Proceedings Paper

Computer Generated Holographic Optical Elements For Optical Disk Memory Read Write Heads
Author(s): Yuzo Ono; Yasuo Kimura; Nobuo Nishida
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Paper Abstract

A new concept optical head, using a holographic optical element has been developed. This holographic element combines three optical functions, beam splitter, focusing error detection and tracking error detection optics functions. A polarizing beam splitter function is also combined for magneto-optical disk head use. These holographic optical elements are computer generated holograms fabricated using electron beam lithography technique. A new optical configuration has been designed for this optical head to remove the influence of wavelength variation in the laser diode used for a light source. The off-set signal in tracking error signal has been reduced by introduction of the holograms which are used only for detecting tacking error. The stable operation and high read out S/N ratio have been obtained by applying this holographic optical element.

Paper Details

Date Published: 6 May 1989
PDF: 8 pages
Proc. SPIE 1052, Holographic Optics: Optically and Computer Generated, (6 May 1989); doi: 10.1117/12.951499
Show Author Affiliations
Yuzo Ono, NEC Corporation (Japan)
Yasuo Kimura, NEC Corporation (Japan)
Nobuo Nishida, NEC Corporation (Japan)

Published in SPIE Proceedings Vol. 1052:
Holographic Optics: Optically and Computer Generated
Ivan Cindrich; Sing H. Lee, Editor(s)

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