Absolute control of the scale factor in GP2 laser gyroscope: Toward a ground based detector of the lense-thirring effect

Belfi, Jacopo; Beverini, N.; Calamai, M.; Carelli, Giorgio; Maccioni, Enrico; Virgilio, A. Di; Santagata, Rosa; Porzio, Alberto; Cuccato, Davide; Ortolan, A.; Solimeno, S.

doi:10.1109/eftf-ifc.2013.6702268

Cited by 6 publications

(6 citation statements)

References 7 publications

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“…A control scheme for the geometrical factor of a single ring is at the moment under development and test at INFN of Pisa with a prototype called GP2 [9]. Monitoring of relative angles between different rings was originally based on higher order modes of the ring cavity [3], but it was then realized that an independent metrology technique had to be developed, something independent of any ring-laser dynamics.…”

Section: The Ginger Experimentsmentioning

confidence: 99%

External metrology system for the stabilization of large ring-lasers

Donazzan

Naletto

Pelizzo

et al. 2016

2016 IEEE Metrology for Aerospace (MetroAeroSpace)

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Active control of the geometrical parameters of large ring-lasers arrays is a challenging task, requiring the development of an accurate length monitoring system acting on the edges of these devices. The proposed solution is based on what was outlined by NASA JPL for its discontinued Space Interferometric Mission (SIM). It will be made up of a network of compact laser heterodyne interferometers, working together to keep the geometrical frame constantly well known (and fixed) to nanometer accuracy. We took the first steps towards the realization of this device by focusing on its fundamental element, i.e. the compact heterodyne laser interferometer. A starting simplified prototype has been conceived and is now under development. Its preliminary design will let us to evaluate parts behavior, alignment issues and links between single components and overall gauge performances. Concerned distance is investigated by means of a reference and a measurement beam, obtained by spatial splitting of the laser source. The phase shift between two heterodyne beatings will provide a reliable signal for precise monitoring of a linear distance

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Section: The Ginger Experimentsmentioning

confidence: 99%

External metrology system for the stabilization of large ring-lasers

Donazzan

Naletto

Pelizzo

et al. 2016

2016 IEEE Metrology for Aerospace (MetroAeroSpace)

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“…Until now two solution approaches have been implemented: ring-laser perimeter measurement based on the analysis of its cavity modes; 12 (square) ring-laser diagonals measurement through Pound-Drever-Hall interrogation of the Fabry-Perot cavities formed by each couple of opposite mirrors. 13 Unfortunately, the information gathered from the inside of a ring-laser cavity is not sufficient to properly constrain the instrument's geometry. This is due to all data collected by means of the two above approaches are strictly dependent on the ring-laser dynamics, such as backscattering and cavity non linearities.…”

Section: The Ginger Projectmentioning

confidence: 99%

A network of heterodyne laser interferometers for monitoring and control of large ring-lasers

et al. 2016

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The sensitivity achieved by large ring-laser gyroscopes will make it possible to detect faint relativistic effects related to the rotation of the Earth’s mass. This task requires a strict control of the ring cavity geometry (shape and orientation), which can be performed by a novel network of portable heterodyne interferometers, capable of measuring the absolute distance betweeen two retro-reflectors with a nominal accuracy better than 1nm. First steps have been taken towards the realization of this device and a starting prototype of distance gauge is under development and test

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“…It is worth noting that even in the case of unbalances of the order of 1 μm the length stabilization constraint provides a high rejection of the mirrors' position perturbations from the scale factor, with residual fluctuations at the level of one part in 10 10 . Motivated by these numerical results we designed a new ring laser gyroscope, called GP2 [14], dedicated to the optimization and stabilization of the geometrical form factor and, in particular, to the experimental implementation of the length stabilization of the diagonal cavities. It is a square resonator 1.6 m in side, equipped with a system of six piezoelectric actuators controlling the four mirrors positions.…”

Section: Introductionmentioning

confidence: 99%

Interferometric length metrology for the dimensional control of ultra-stable ring laser gyroscopes

Belfi

Beverini

Cuccato

et al. 2014

Class. Quantum Grav.

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We present the experimental test of a method for controlling the absolute length of the diagonals of square ring laser gyroscopes. The purpose is to actively stabilize the ring cavity geometry and to enhance the rotation sensor stability in order to reach the requirements for the detection of the relativistic Lense-Thirring effect with a ground-based array of optical gyroscopes. The test apparatus consists of two optical cavities 1.32 m in length, reproducing the features of the ring cavity diagonal resonators of large frame He-Ne ring laser gyroscopes. The proposed measurement technique is based on the use of a single diode laser, injection locked to a frequency stabilized He-Ne/Iodine frequency standard, and a single electro-optic modulator. The laser is modulated with a combination of three frequencies allowing to lock the two cavities to the same resonance frequency and, at the same time, to determine the cavity Free Spectral Range (FSR). We obtain a stable lock of the two cavities to the same optical frequency reference, providing a length stabilization at the level of 1 part in 10 11 , and the determination of the two FSRs with a relative precision of ∼ 2 · 10 −7 . This is equivalent to an error of 500 nm on the absolute length difference between the two cavities.

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Absolute control of the scale factor in GP2 laser gyroscope: Toward a ground based detector of the lense-thirring effect

Cited by 6 publications

References 7 publications

External metrology system for the stabilization of large ring-lasers

External metrology system for the stabilization of large ring-lasers

A network of heterodyne laser interferometers for monitoring and control of large ring-lasers

Interferometric length metrology for the dimensional control of ultra-stable ring laser gyroscopes

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