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Proceedings Paper

Focusing error detection utilizing linearized Fresnel zone plate
Author(s): Tadashi Takeda; Hiroyuki Wada; Ricardo Musashi Okamoto; Kenji Fukui
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Paper 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.

Paper Details

Date Published: 2 March 1993
PDF: 12 pages
Proc. SPIE 1732, Holographics International '92, (2 March 1993); doi: 10.1117/12.140413
Show Author Affiliations
Tadashi Takeda, Sankyo Seiki Manufacturing Co., Ltd. (Japan)
Hiroyuki Wada, Nippon Steel Corp. (Japan)
Ricardo Musashi Okamoto, Nippon Steel Corp. (Japan)
Kenji Fukui, Nippon Steel Corp. (Japan)


Published in SPIE Proceedings Vol. 1732:
Holographics International '92

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