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Proceedings Paper

Optical Spectrum Analysis And Imaging Of Magnetic Tape Patterns Using The Kerr Effect
Author(s): A. Chao; W. Hagemeier; J. Williams
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Paper Abstract

The power spectrum of a time varying signal may be realized using optical techniques by first converting the temporal variations to corresponding spatial patterns, then illuminating the spatial pattern with coherent, collimated light and observing the far field diffraction pattern. The light intensity distribution in the diffraction pattern is directly equivalent to the power distribution in the spectrum of the original signal (Ref.1). This paper describes the implementation and perform-ance of a real time, coherent optical spectrum analyzer that uses magnetic tape recording to convert temporal variations to corresponding spatial magnetic patterns, and uses the longitudinal Kerr magneto-optic effect to couple these magnetic patterns to a coherent illumination source. A magneto-optic transducer was developed that replicates the magnetic patterns from magnetic tape by contact printing and has magnetic and optical properties required to achieve a sufficiently large Kerr effect for practical applications.

Paper Details

Date Published: 1 March 1974
PDF: 6 pages
Proc. SPIE 0052, Coherent Optical Processing, (1 March 1974); doi: 10.1117/12.954180
Show Author Affiliations
A. Chao, Magnavox Research Laboratories (United States)
W. Hagemeier, Magnavox Research Laboratories (United States)
J. Williams, Magnavox Research Laboratories (United States)

Published in SPIE Proceedings Vol. 0052:
Coherent Optical Processing
H. John Caulfield, Editor(s)

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