Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-10-31
1989-09-12
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356369, G02F 101, G01J 400
Patent
active
048662640
ABSTRACT:
Method and apparatus for high accuracy measurement of non-reciprocal reflectivity of magnetic thin film materials and magnetic mirrors. An ellipsometer which employs a Helmholtz coil to supply magneto-optic modulation to p-polarized light and an acousto-optic modulator to provide intensity modulation is utilized in conjunction with a novel scheme of analyzer rotation and computational techniques to accurately measure non-reciprocal reflectivity. A microcomputer is used to provide controlled rotation of polarizing elements, data logging, data analysis, and output. The non-reciprocal reflectivity value is determined by the slope of the measured ratio of magneto-optically modulated and absolute intensities (.delta.I.sub.magnetic /I.sub.total), plotted against a function of the analyzer angle G(.PSI.).
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Biricik V. Warren
Nakatsukasa Frank R.
Anderson Terry J.
Block Robert B.
Messinger Michael
Northrop Corporation
Westin Edward P.
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