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Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System

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Mode selection in an ultralarge ring laser gyro.

Richard D Graham¹, Robert B Hurst, K-Ulrich Schreiber

¹Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand. rdgraham@uw.edu

|August 4, 2012

Summary

Researchers developed a new control technique for large ring laser gyroscopes, enabling faster single-mode configuration. This method uses alternating mode splitting and self-seeding with low photon counts, improving gyroscope performance.

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Area of Science:

Physics
Optical Engineering
Instrumentation

Background:

Large ring laser gyroscopes (RLGs) face operational challenges, particularly long settling times to reach a stable single-mode configuration.
Achieving a single-mode state is crucial for accurate rotation sensing in inertial navigation systems.

Purpose of the Study:

To address the slow single-mode configuration time in large RLGs.
To investigate a novel control technique involving alternating mode splitting and external seeding.
To determine the minimum photon intensity required for effective self-seeding.

Main Methods:

Development of a control technique that alternates the order of mode splitting between corotating beams.
Theoretical analysis of advantages, including noise reduction from perimeter variations and elimination of Adler pulling errors.
Investigation of external seeding requirements, focusing on photon intensity for mode configuration.

Main Results:

The proposed alternating mode splitting technique offers theoretical advantages in reducing noise and systematic errors.
External seeding is proposed to accelerate the mode configuration process.
Successful self-seeding of the operating mode in large RLGs was achieved with seed beams near a (6±3) single photon cavity mode population.

Conclusions:

A novel control strategy for large RLGs has been demonstrated, significantly reducing the time to achieve a single-mode configuration.
The technique leverages alternating mode splitting and effective self-seeding with minimal photon input.
This advancement has the potential to enhance the performance and applicability of large-scale ring laser gyroscopes.