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Proceedings Paper

Calculation of focal positions in an optical head using a four-beam laser diode
Author(s): Masahisa Shinoda; Kenjiro Kime
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Paper Abstract

Calculation method for focal positions in a multi-beam optical head using a multi-beam laser diode is introduced. In this calculation model, focal positions were so calculated that a light source of each laser beam with a specific source height and an astigmatic difference was imaged by optical lenses and a beam shaping prism. Calculated results show that four focal positions are located each other with defocus along the optical axis due to the curvature of field of lenses. Astigmatic differences in focal spots caused by the laser diode characteristics can be decreased by almost zero with a displacement of a collimator lens along the optical axis.

Paper Details

Date Published: 23 October 1998
PDF: 7 pages
Proc. SPIE 3401, Optical Data Storage '98, (23 October 1998); doi: 10.1117/12.327926
Show Author Affiliations
Masahisa Shinoda, Mitsubishi Electric Corp. (Japan)
Kenjiro Kime, Mitsubishi Electric Corp. (Japan)

Published in SPIE Proceedings Vol. 3401:
Optical Data Storage '98
Shigeo R. Kubota; Tomas D. Milster; Paul J. Wehrenberg, Editor(s)

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