Optical filtering in the collection path of a data storage device

Thomas D Milster, Mark S. Wang, Weiquan Li, Ed Walker

Research output: Contribution to journalArticle

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Abstract

The effects of placing a shading band in the collection path of a magneto-optical data storage device are presented. The shading band consists of an opaque region in the center of the collection aperture, which reduces the low-frequency response of the system without affecting the high-frequency response. This partially equalizes the system transfer function. Dynamic measurements indicate that the noise is also reduced in the low-frequency region, thus not significantly affecting the narrow-band carrier-to-noise ratio (CNR). The integrated signal-to-noise ratio (SNR) shows slight improvement in the high-frequency region.

Original languageEnglish (US)
Pages (from-to)5397-5401
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume32
Issue number11 B
Publication statusPublished - Nov 1993

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ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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