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Optical Engineering

Superimposed grating for use with magneto-optical disk heads
Author(s): Shigeru Aoyama; Tsukasa Yamashita
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Paper Abstract

A superimposed grating comprising a diffraction grating and a high-frequency grating, whose aim is to achieve alignment-free and multifunctional integrated optical elements, is demonstrated for the first time. Then a lightweight and compact magneto-optical disk head that uses this superimposed grating is proposed. The superimposed grating, which simultaneously operates a polarizing beamsplitter and an off-axis cylindrical lens, has three functions required for optical heads: focusing error detection, tracking error detection, and signal detection. Measured focusing and polarizing characteristics suggest that the superimposed grating has the desirable error detection and signal detection for magneto-optical disk heads. A detailed investigation of this grating with an emphasis on clarifying both its basic principles and its use with magneto-optical disk heads is presented.

Paper Details

Date Published: 1 November 1994
PDF: 7 pages
Opt. Eng. 33(11) doi: 10.1117/12.179882
Published in: Optical Engineering Volume 33, Issue 11
Show Author Affiliations
Shigeru Aoyama, Omron Corp. (Japan)
Tsukasa Yamashita, Omron Corp. (Japan)

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