1 November 1994 Superimposed grating for use with magneto-optical disk heads
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Optical Engineering, 33(11), (1994). doi:10.1117/12.179882
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.
Shigeru Aoyama, Tsukasa Yamashita, "Superimposed grating for use with magneto-optical disk heads," Optical Engineering 33(11), (1 November 1994). http://dx.doi.org/10.1117/12.179882
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KEYWORDS
Diffraction gratings

Head

Data storage

Signal detection

Diffraction

Polarization

Beam splitters

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