Computer Generated Holographic Optical Elements For Optical Disk Memory Read Write Heads

Yuzo Ono; Yasuo Kimura; Nobuo Nishida

doi:10.1117/12.951499

6 May 1989 Computer Generated Holographic Optical Elements For Optical Disk Memory Read Write Heads

Yuzo Ono, Yasuo Kimura, Nobuo Nishida

Proceedings Volume 1052, Holographic Optics: Optically and Computer Generated; (1989) https://doi.org/10.1117/12.951499
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

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.

Citation Download Citation

Yuzo Ono, Yasuo Kimura, and Nobuo Nishida "Computer Generated Holographic Optical Elements For Optical Disk Memory Read Write Heads", Proc. SPIE 1052, Holographic Optics: Optically and Computer Generated, (6 May 1989); https://doi.org/10.1117/12.951499

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