Modulated high sensitivity infrared polarimeter

Details Modulated high sensitivity infrared polarimeter Modulated high sensitivity infrared polarimeter

1992-02-24

1993-05-11

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

356367, 356370, 356368, G01N 2121

Patent

active

052104176

ABSTRACT:
A modulated Faraday rotation signal is produced by passing a linearly polarized laser beam through a semiconductor wafer sample in a modulated magnetic field that is induced in an electromagnet by a sine wave generator and driver coupled thereto. The rotation signal is normalized by dividing by a transmission signal produced by modulating the beam with a chopper that operates at a different frequency from the frequency of the driver. The result is a Faraday rotation measurement with high signal-to-noise ratio and compensation for laser drift in intensity.

REFERENCES:
patent: 4637726 (1987-01-01), Walker et al.
patent: 4818881 (1989-04-01), Tanton et al.
V. A. Yatsenko and V. A. Bokov, "Magnetooptical Apparatus for Measuring the araday Effect and Susceptibility of Magnetic Films." Translated from Pribory i Tekhnika Eksperimeta, No. 4 (Jul.-Aug. 1979) pp. 227-230, Copyright.RTM. 1980 Plenum Publishing Corporation.
"A Nondestructive Testing Technique for Characterizing Infrared Detector/Focal Plane Array Material" by Frederick W. Clarke, Charles R. Christensen, John A. Grisham and John L. Stensby, Jan. 1991.

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