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2 March 1993 Focusing error detection utilizing linearized Fresnel zone plate
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Proceedings Volume 1732, Holographics International '92; (1993) https://doi.org/10.1117/12.140413
Event: Holographics International '92, 1992, London, United Kingdom
Abstract
Applying photo-lithography technique, a new type of Fresnel zone plates (FZPs) are developed to detect focusing error (FE) signal of the optical head. By radially spread lines, the FZPs are divided into several areas where the zones of the FZPs are straightened. Comparison among conventional FE detective devices and curved patterned FZPs and straight patterned FZPs are numerically and experimentally demonstrated.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Tadashi Takeda, Hiroyuki Wada, Ricardo Musashi Okamoto, and Kenji Fukui "Focusing error detection utilizing linearized Fresnel zone plate", Proc. SPIE 1732, Holographics International '92, (2 March 1993); https://doi.org/10.1117/12.140413
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