Calculation of focal positions in an optical head using a four-beam laser diode

Masahisa Shinoda; Kenjiro Kime

doi:10.1117/12.327926

23 October 1998 Calculation of focal positions in an optical head using a four-beam laser diode

Masahisa Shinoda, Kenjiro Kime

Proceedings Volume 3401, Optical Data Storage '98; (1998) https://doi.org/10.1117/12.327926
Event: Optical Data Storage '98, 1998, Aspen, CO, United States

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.

Citation Download Citation

Masahisa Shinoda and Kenjiro Kime "Calculation of focal positions in an optical head using a four-beam laser diode", Proc. SPIE 3401, Optical Data Storage '98, (23 October 1998); https://doi.org/10.1117/12.327926

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