A high sensitivity tool for geophysical applications: A geometrically locked Ring Laser Gyroscope

E. Maccioni; N. Beverini; G. Carelli; G. Di Somma; A. Di Virgilio; P. Marsili

doi:10.1364/ao.469834

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arXiv · 2207.04942

A high sensitivity tool for geophysical applications: A geometrically locked Ring Laser Gyroscope

E. Maccioni·N. Beverini·G. Carelli·G. Di Somma·A. Di Virgilio·P. Marsili

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Abstract

This work demonstrates that a middle size ring laser gyroscope (RLG) can be a very sensitive and robust instrument for rotational seismology, even if it operates in a quite noisy environment. The RLG has a square cavity, $1.60\times 1.60$ m$^2$, and it lies in a plane orthogonal to the Earth rotational axis. The Fabry-Perot optical cavities along the diagonals of the square were accessed and their lengths were locked to a reference laser. Through a quite simple locking circuit, we were able to keep the sensor fully operative for 14 days. The obtained long term stability is of the order of 3~nanorad/s and the short term sensitivity close is to 2~nanorad/s$\cdot$Hz$^{-1/2}$. These results are limited only by the noisy environment, our laboratory is located in a building downtown.

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E. Maccioni, N. Beverini, G. Carelli, G. Di Somma, A. Di Virgilio, P. Marsili. 2022-07-11. A high sensitivity tool for geophysical applications: A geometrically locked Ring Laser Gyroscope. https://doi.org/10.1364/ao.469834

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