Focusing error detection utilizing linearized Fresnel zone plate

Tadashi Takeda; Hiroyuki Wada; Ricardo Musashi Okamoto; Kenji Fukui

doi:10.1117/12.140413

2 March 1993 Focusing error detection utilizing linearized Fresnel zone plate

Tadashi Takeda, Hiroyuki Wada, Ricardo Musashi Okamoto, Kenji Fukui

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.

Citation Download Citation

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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