Controlling the non-linear intracavity dynamics of large He–Ne laser gyroscopes

Cuccato, Davide; Beghi, Alessandro; Belfi, Jacopo; Beverini, N.; Ortolan, A.; Virgilio, A. Di

doi:10.1088/0026-1394/51/1/97

Cited by 23 publications

(23 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…iii) Identify and refine the estimate of the Lamb parameters which regulate the non-linear dynamics of the ringlaser itself [15]. The identification procedure will consist of two parts: i) identification and monitoring of cavity losses from mono-beam amplitudes and phase; ii) estimate and monitoring of the laser single pass gain and the remaining Lamb parameters from the measured plasma dispersion function of the He-Ne mixture.…”

Section: G -W E T T Z E Llq U a N T U M N O Is E Li M It G In G E Rq mentioning

confidence: 99%

A ring lasers array for fundamental physics

Virgilio

Allegrini

Beghi

et al. 2014

Comptes Rendus. Physique

View full text Add to dashboard Cite

Ring laser (RL) gyroscopes are, at present, the most precise sensors of absolute angular velocity. In the near future, their application is foreseen to provide ground based tests of General Relativity. We have recently proposed a tri-axial array of RLs that can reach the sensitivity, accuracy, and long term stability required to measure the inertial frame dragging induced by the rotating Earth, as predicted by General Relativity. The effect, also known Lense-Thirring effect, amounts for the Earth to 1 part in 10 9 of its rotation rate, thus requiring an unprecedented sensitivity and accuracy of experimental apparatus. An array of at least 3 RLs would allow us to measure not only the rotation rate, i.e. the angular velocity modulus, but also the angular velocity vector. In this way, having at disposal the time series of the daily estimate of Earth rotation vector from the International Earth Rotation and Reference System Service, it would be possible to isolate the Geodetic and Lense-Thirring contributions. Our proposal GINGER (Gyro-scopes IN GEneral Relativity) is intended to push the present knowledge of RL physics and technology to achieve an accuracy in the estimation of the Earth rotation rate of 1 part in 10 9. In the experimental apparatus we have to account for systematic errors resulting from non linear dynamics of the active laser medium, and changes of the optical cavity geometry. The redundancy of the array, e.g. the addition of a ring almost parallel to the Earth rotation axis, should allow for the reduction of such errors at the level of the geometry control. In this contribution we describe the intermediate prototypes GP2 and GEMS (GINGER External Metrology System) devoted to control the geometrical fluctuations of a RL cavity and the 3D geometry of the RL array (dihedral angles among RLs), respectively.

show abstract

Section: G -W E T T Z E Llq U a N T U M N O Is E Li M It G In G E Rq mentioning

confidence: 99%

A ring lasers array for fundamental physics

Virgilio

Allegrini

Beghi

et al. 2014

Comptes Rendus. Physique

View full text Add to dashboard Cite

show abstract

“…In fact, as the gyroscope stability and accuracy [4]. The perspective of this approach for the case of larger and much more stable devices, as well possible improvements of the method, will be discussed.…”

Section: Padova Italymentioning

confidence: 99%

Experimental activity toward GINGER (gyroscopes IN general relativity)

Belfi¹,

Bosi²,

Virgilio³

et al. 2014

2014 International Conference Laser Optics

View full text Add to dashboard Cite

We report about the recent progresses toward the development of a laser gyroscope detector for a ground based measurement of the Earth's relativistic frame dragging. The main part of the presented activity involves the control of the systematic errors related to the fluctuation of the cavity geometry and the active medium parameters. A new square ring laser 1.6 m in side, named "GP2", has been built with the aim of setting its cavity shape as close as possible to a "perfect square".This kind of setup will be the building block for an ultra-sensitive tri-axial rotation detector aiming at fundamental Physics applications

show abstract

“…-Correction of the nonlinear laser dynamics.Intracavity dynamics introduces nonreciprocal effects consisting in a null-shift term in the laser gyroscope response. To achieve the required accuracy, an estimate of these contributions must be implemented [6].…”

Section: Introductionmentioning

confidence: 99%

Very high sensitivity laser gyroscopes for general relativity tests in a ground laboratory

Belfi

Bosi

Virgilio

et al. 2016

2016 European Frequency and Time Forum (EFTF)

View full text Add to dashboard Cite

Two ring laser gyroscopes are being developed by the INFN in view of fundamental Physics applications. The scope of this activity is to 'fill the gap' between the present state of the art technology and the requirements in sensitivity and accuracy needed for general relativity tests. The first prototype, called GP2 and located at INFN Pisa, is dedicated to the interferometric control of the ring laser cavity form factor. The second prototype, called GINGERino, is a larger ring laser located deep underground (INFN LNGS) and has the scope of characterizing the low frequency rotational noise of the site. We show the most recent results of the two experiments

show abstract

Controlling the non-linear intracavity dynamics of large He–Ne laser gyroscopes

Cited by 23 publications

References 21 publications

A ring lasers array for fundamental physics

A ring lasers array for fundamental physics

Experimental activity toward GINGER (gyroscopes IN general relativity)

Very high sensitivity laser gyroscopes for general relativity tests in a ground laboratory

Contact Info

Product

Resources

About