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Proceedings Paper

Retardation Effects In Magneto-Optic Readout
Author(s): Alan B. Marchant
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Paper Abstract

The performance of a magneto-optic readout system is easily degraded by optical retardations, or polarization-dependent phase shifts. Optical interference structures meant to enhance the magneto-optic effect can produce retardation which reduces the readout signal. Polarization-dependent optical elements (prisms, mirrors, etc.) can either exacerbate or compensate for this problem. Retardation due to substrate birefringence is an even more serious problem because it can cause relatively large intensity fluctuations at the photodetectors. Injection-molding techniques which minimize normal-incidence birefringence in polycarbonate substrates have been demonstrated; however vertical birefringence, which causes large retardation for marginal light rays, remains an unsolved problem.

Paper Details

Date Published: 14 January 1987
PDF: 8 pages
Proc. SPIE 0695, Optical Mass Data Storage II, (14 January 1987); doi: 10.1117/12.936848
Show Author Affiliations
Alan B. Marchant, Verbatim Corporation (United States)

Published in SPIE Proceedings Vol. 0695:
Optical Mass Data Storage II
Robert P. Freese; Albert A. Jamberdino; Maarten R. de Haan, Editor(s)

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