Accession Number : ADD015256

Title :   Modulated High Sensitivity Infrared Polarimeter.

Descriptive Note : Patent Application, Filed 24 Feb 92,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Grisham, John A ; Clarke, Frederick W ; Christensen, Charles R ; Stenby, John L

Report Date : 24 Feb 1992

Pagination or Media Count : 10

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 a 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 and beam direction. (Author)

Descriptors :   *PATENT APPLICATIONS

Subject Categories : Optics
      Infrared Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE