1 July 1991 Focus-error detection from far-field image flow
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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.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hiromichi Ishibashi, Hiromichi Ishibashi, Shin-ichi Tanaka, Shin-ichi Tanaka, Mitsuro Moriya, Mitsuro Moriya, } "Focus-error detection from far-field image flow", Proc. SPIE 1499, Optical Data Storage '91, (1 July 1991); doi: 10.1117/12.45907; https://doi.org/10.1117/12.45907
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