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Project TitleEnhancement of the Phase Response of Intracavity Phase Interferometers
Track Code2016-078
Short Description

A system to enhance the phase response of intracavity phase interferometers.

Abstract

Compared to He-Ne laser gyros, this proposed gyro is considerably lighter, more sensitive, has no moving parts, is all solid state, and has no dead band.

 
Tagsinterferometers, interferometer, inertial measurement, Gyroscopes
 
Posted DateAug 1, 2017 11:32 AM

Researcher

Name
Jean-Claude Diels
Ladan Arissian
Matthias Lenzner

Manager

Name
Briana Wobbe

Background

An active laser gyro is a ring laser in which two beams circulate independently in opposite sense. The gyroscopic response is obtained by beating the two output beams corresponding to the counter-circulating waves on a detector. A phase shift per round-trip on either beam (Sagnac phase shift) causes a frequency shift of the cavity modes with opposite sign for the two directions; the difference between the two is the beat frequency that is measured.  Active laser gyros have been mainly limited to He-Ne lasers for the following reasons:
    1) gain competition; which will always prefer one of the two directions and require a specially prepared inhomogeneously broadened medium, and
    2) injection locking of one beam into the oppositely circulating beam, which eliminates the gyro response for low angular velocity (the so-called lock-in effect causing the dead band).
These restrictions make a low pressure gas medium preferable. The primary manufacturers of laser gyros produce antiquated He-Ne laser gyros that are bulky, expensive, and with vacuum discharge tubes susceptible to leak.  There is a present market need for advancement in laser gyroscopes in order to overcome these drawbacks and provide superior sensitivity.

Technology Description

Researchers at the University of New Mexico and Lenzner Research, LLC have developed a system to enhance the phase response of intracavity phase interferometers. Compared to He-Ne laser gyros, this proposed gyro is considerably lighter, more sensitive, has no moving parts, is all solid state, and has no dead band.

Advantages/Applications

  • Enhancement of phase response
  • No dead band
  • Extreme sensitivity makes it ideal for space technology
  • In a simple laser cavity, orders of magnitude of different mode spacing of a dual comb structure has been demonstrated
  • Potential application for inertial measurements for drones, balloons, and satellites
  • Additional applications in magnetic field measurements (with a sensitivity that could detect brain waves), Laser Interferometer Gravitational-Wave Observatory (LIGO), electric field measurements, nonlinear index measurements

Publications

INQUIRES

STC has filed intellectual property on this exciting new technology and is currently exploring commercialization options. If you are interested in information about this or other technologies, please contact Arlene Mirabal at amirabal@stc.unm.edu or 505-272-7886.