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

Report Date:

1992-02-24

Pagination or Media Count:

10.0

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:

Subject Categories:

  • Optics
  • Infrared Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE