Focus-error detection from far-field image flow

Hiromichi Ishibashi; Shin-ichi Tanaka; Mitsuro Moriya

doi:10.1117/12.45907

1 July 1991 Focus-error detection from far-field image flow

Hiromichi Ishibashi, Shin-ichi Tanaka, Mitsuro Moriya

Proceedings Volume 1499, Optical Data Storage '91; (1991) https://doi.org/10.1117/12.45907
Event: Optical Data Storage, 1991, Colorado Springs, CO, United States

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.

Citation Download Citation

Hiromichi Ishibashi, Shin-ichi Tanaka, and Mitsuro Moriya "Focus-error detection from far-field image flow", Proc. SPIE 1499, Optical Data Storage '91, (1 July 1991); https://doi.org/10.1117/12.45907

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