Related papers: Noise level of a ring laser gyroscope in the femto-rad/s range

Noise level of a ring laser gyroscope in the femto-rad/s range

URL: http://arxiv.org/abs/2301.01386v2
Date: Fri, 7 Jun 2024 07:48:56 GMT
Title: Noise level of a ring laser gyroscope in the femto-rad/s range
Authors: Angela D. V. Di Virgilio, Francesco Bajardi, Andrea Basti, Nicolò Beverini, Giorgio Carelli, Donatella Ciampini, Giuseppe Di Somma, Francesco Fuso, Enrico Maccioni, Paolo Marsili, Antonello Ortolan, Alberto Porzio, David Vitali,
Abstract summary: We show that the GINGERINO active--ring laser upper limiting noise is close to $2 times 10-15$ rad/s for $sim 2 times 105$ s of integration time. This is more than a factor 10 better than the theoretical prediction so far accounted for ideal ring lasers shot--noise.
Score: 0.0
License: http://creativecommons.org/licenses/by-nc-nd/4.0/
Abstract: Absolute angular rotation rate measurements with sensitivity better than prad/s would be beneficial for fundamental science investigations. On this regard, large frame Earth based ring laser gyroscopes are top instrumentation as far as bandwidth, long--term operation, and sensitivity are concerned. Here, we demonstrate that the GINGERINO active--ring laser upper limiting noise is close to $2 \times 10^{-15}$ rad/s for $\sim 2 \times 10^5$ s of integration time, as estimated by the Allan deviation evaluated in a differential measurement scheme. This is more than a factor 10 better than the theoretical prediction so far accounted for ideal ring lasers shot--noise with the two beams counter--propagating inside the cavity considered as two independent propagating modes. This feature is related to the peculiarity of real ring laser system dynamics that causes phase cross--talking among the two counter--propagating modes. In this context, the independent beam model is, then, not applicable and the measured noise limit falls below the expected one.

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