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Theoretical analysis on the rotation-induced frequency difference in ring lasers with coupled cavities
Applied Optics
|November 13, 2015
Summary
We analyzed coupled cavities in ring laser gyros to enhance sensitivity. The coupled cavity area boosts the effective scale factor, making highly sensitive ring laser gyros more practical.
Area of Science:
- Optics and Photonics
- Laser Physics
- Inertial Navigation Systems
Background:
- Ring laser gyros (RLGs) are crucial for inertial navigation.
- Enhancing the sensitivity of RLGs is an ongoing research challenge.
- Previous designs, like the "zero-vector-area" approach, have limitations.
Purpose of the Study:
- To analyze the effective scale factor of RLGs with coupled cavities.
- To introduce a more universal and controllable method for characterizing coupled cavities.
- To investigate methods for enhancing RLG sensitivity using coupled cavities.
Main Methods:
- General analysis of the effective scale factor in RLGs with coupled cavities.
- Characterization of coupled cavities using propagation loss, offering greater control than transmittance and reflectivity.
- Mathematical derivation of the enhancement factor based on cavity geometry.
Main Results:
- Coupled cavities, formed by various mirror configurations or fiber coils, can be analyzed generally.
- Propagation loss provides a more practical and controllable metric for coupled cavities.
- The effective scale factor is enhanced by a factor of 1+l/L, where l and L are the round-trip lengths of the ring laser and coupled cavity, respectively.
Conclusions:
- The proposed scheme using coupled cavities offers a practical method for enhancing RLG sensitivity.
- The geometric enhancement factor (1+l/L) provides a significant boost to the effective scale factor.
- These findings are vital for developing next-generation, highly sensitive ring laser gyros.
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