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Optimization of the geometrical stability in square ring laser gyroscopes (Articolo in rivista)

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Optimization of the geometrical stability in square ring laser gyroscopes (Articolo in rivista) (literal)

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Santagata, Rosa; Beghi, Alessandro; Belfi, Jacopo; Beverini, Nicolò; Cuccato, Davide; Virgilio, Angela Di; Ortolan, Antonello; Porzio, Alberto; Solimeno, Salvatore (2015)
Optimization of the geometrical stability in square ring laser gyroscopes
in Classical and quantum gravity (Print)
(literal)

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Santagata, Rosa; Beghi, Alessandro; Belfi, Jacopo; Beverini, Nicolò; Cuccato, Davide; Virgilio, Angela Di; Ortolan, Antonello; Porzio, Alberto; Solimeno, Salvatore (literal)

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1 Department of Physics, University of Siena, Via Roma 56, Siena, Italy 2 INFN Section of Pisa, Largo Bruno Pontecorvo 3, Pisa, Italy 3 Department of Information Engineering, University of Padova, Via Gradenigo 6/B, Padova, Italy 4 Department of Physics, University of Pisa, Largo Bruno Pontecorvo 3, Pisa, Italy 5 INFN Section of Padova, Via Marzolo 8, 35131, Padova, Italy 6 INFN National Laboratories of Legnaro, Viale dell'Università 2, Legnaro, Padova, Italy 7 CNR-SPIN Section of Napoli, Complesso Universitario Monte Sant'Angelo, Via Cintia, Napoli, Italy 8 INFN Section of Napoli, Complesso Universitario Monte Sant'Angelo, Via Cintia, Napoli, Italy 9 Department of Physics, University of Napoli, Complesso Universitario Monte Sant'Angelo, Via Cintia, Napoli, Italy (literal)

Titolo

Optimization of the geometrical stability in square ring laser gyroscopes (literal)

Abstract

Ultra-sensitive ring laser gyroscopes are regarded as potential detectors of the general relativistic frame-dragging effect due to the rotation of the Earth. Our project for this goal is called GINGER (gyroscopes in general relativity), and consists of a ground-based triaxial array of ring lasers aimed at measuring the rotation rate of the Earth with an accuracy of 10-14 rad s-1. Such an ambitious goal is now within reach, as large-area ring lasers are very close to the required sensitivity and stability. However, demanding constraints on the geometrical stability of the optical path of the laser inside the ring cavity are required. Thus, we have begun a detailed study of the geometry of an optical cavity in order to find a control strategy for its geometry that could meet the specifications of the GINGER project. As the cavity perimeter has a stationary point for the square configuration, we identify a set of transformations on the mirror positions that allows us to adjust the laser beam steering to the shape of a square. We show that the geometrical stability of a square cavity strongly increases by implementing a suitable system to measure the mirror distances, and that the geometry stabilization can be achieved by measuring the absolute lengths of the two diagonals and the perimeter of the ring. (literal)

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