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Related Experiment Videos

Design and initial operation of a 367-m2 rectangular ring laser.

Robert W Dunn1, Dmitry E Shabalin, Robert J Thirkettle

  • 1Department of Physics, Hendrix College, 1600 Washington Avenue, Conway, Arizona 72032, USA. dunn@mercury.hendrix.edu

Applied Optics
|March 30, 2002
PubMed
Summary
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This study demonstrates a large He-Ne ring laser resonator, achieving a 1513 Hz Earth-induced Sagnac frequency with high precision. Earth's rotation minimized lock-in issues, enabling stable single-mode operation.

Area of Science:

  • Physics
  • Optical Engineering
  • Metrology

Background:

  • Ring laser gyroscopes are sensitive to rotation.
  • Lock-in is a common issue in low-frequency operation.
  • Helium-Neon (He-Ne) lasers are stable light sources.

Purpose of the Study:

  • To design and operate a proof-of-principle rectangular He-Ne ring laser resonator.
  • To measure the Earth-induced Sagnac frequency.
  • To investigate methods for achieving stable single-mode operation and overcoming lock-in.

Main Methods:

  • Constructed a 77.0 m perimeter rectangular resonator.
  • Operated with unevacuated beam lines.
  • Increased plasma tube pressure to broaden the linewidth.

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Main Results:

  • Achieved an Earth-induced Sagnac frequency of 1513 Hz.
  • Demonstrated a relative Allan deviation down to 3 parts per million over 1000 s.
  • Earth's rotation effectively eliminated lock-in susceptibility.
  • Single-mode operation was facilitated by increased plasma tube pressure.

Conclusions:

  • The large He-Ne ring laser resonator is a viable proof-of-principle device.
  • Earth's rotation is beneficial for stabilizing ring laser performance.
  • Plasma tube pressure is a key parameter for achieving single-mode operation.