Modulated High Sensitivity Infrared Polarimeter.

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)

Document Details

Document Type
Technical Report
Publication Date
Feb 24, 1992
Accession Number
ADD015256

Entities

People

  • Charles R. Christensen
  • Frederick W. Clarke
  • John A. Grisham
  • John L. Stenby

Organizations

  • United States Army

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Compensation
  • Compound Semiconductors
  • Electromagnets
  • Electronics
  • Energy Systems
  • Frequency
  • Frequency Shift
  • Generators
  • Intensity
  • Laser Beams
  • Lasers
  • Maglev
  • Magnetic Fields
  • Measurement
  • Rotation
  • Semiconductors
  • Sine Waves

Fields of Study

  • Physics

Readers

  • Astronomy and Astrophysics.
  • Electronics Engineering
  • Phased Array Antenna Design.

Technology Areas

  • Directed Energy
  • Microelectronics