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Proceedings Paper

Focus-error detection from far-field image flow
Author(s): Hiromichi Ishibashi; Shin-ichi Tanaka; Mitsuro Moriya
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Paper Abstract

Features of a focus-error detection method from a far-field diffraction pattern are studied both theoretically and experimentally. An obtained focus-error signal, being a nonlinear function of focus error, has wide dynamic range of +/- 4 micrometers and enough signal-to-noise ratio for a stable focusing servo.

Paper Details

Date Published: 1 July 1991
PDF: 8 pages
Proc. SPIE 1499, Optical Data Storage '91, (1 July 1991); doi: 10.1117/12.45907
Show Author Affiliations
Hiromichi Ishibashi, Matsushita Electric Industrial Co., Ltd. (Japan)
Shin-ichi Tanaka, Matsushita Electric Industrial Co., Ltd. (Japan)
Mitsuro Moriya, Matsushita Electric Industrial Co., Ltd. (Japan)


Published in SPIE Proceedings Vol. 1499:
Optical Data Storage '91

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