T violation and microhertz resolution in a ring laser

Stedman, Geoffrey; Johnsson, Mattias; Li, Z.; Rowe, C. H.; Bilger, H. R.

doi:10.1364/ol.20.000324

Cited by 13 publications

(6 citation statements)

References 13 publications

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“…breaking of local Lorentz invariance, axion detection, Lense-Thirring frame dragging, etc [10]. In fact, RLs have the potential to detect time reversal violating signals with extraordinarily high sensitivity [11]. In this paper, we demonstrate a considerable improvement of large RLs in sensing such signals by measuring laser induced nonreciprocities with an accuracy of 1 part in 10 2 .…”

Section: Introductionmentioning

confidence: 80%

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

et al. 2014

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A model based on Lamb's theory of gas lasers is applied to a He-Ne ring laser gyroscope to estimate and remove the laser dynamics contribution from the rotation measurements. The intensities of the counter-propagating laser beams exiting one cavity mirror are continuously observed together with a monitor of the laser population inversion. These observables, once properly calibrated with a dedicated procedure, allow us to estimate cold cavity and active medium parameters driving the main part of the nonlinearities of the system. The parameters identification and noise subtraction procedure has been verified by means of a Monte Carlo study of the system, and experimentally tested on the G-PISA ring laser oriented with the normal to the ring plane almost parallel to the Earth rotation axis. In this configuration the Earth rotation-rate provides the maximum Sagnac effect while the contribution of the orientation error is reduced at minimum. After the subtraction of laser dynamics by a Kalman filter, the relative systematic errors of G-PISA reduce from 50 to 5 parts in 10 3 and can be attributed to the residual uncertainties on geometrical scale factor and orientation of the ring.

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Section: Introductionmentioning

confidence: 80%

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

et al. 2014

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“…As is often the case, the first mention of the idea is elusive. While a reasonably general theorem to this effect was enunciated recently (Stedman et al 1995a) several partial anticipations may be noted in the literature (Markelov et al 1977, Zhang et al 1992, Kapitulnik et al 1994, Weber et al 1994 and an early discussion of the capabilities of ring devices given by Alekseev et al (1976) includes a proof that the splitting of the resonant frequencies of beams with different helicity in a ring resonator is P-odd (anticipating the discussion of equations (62) and (63) below). T violation in high-T c superconductors has already been tested using a fibre-optic gyroscope (Spielman et al 1990).…”

Section: General Theorymentioning

confidence: 96%

Ring-laser tests of fundamental physics and geophysics

1997

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HeNe ring-laser gyros are standard sensors in inertial guidance; mirror reflectances now reach 99.9999%. Present research instruments have an area of ∼ 1 m 2 , a passive quality factor of 10 11 , and a resolution of the frequency difference of counter-rotating optical beams approaching microhertz. In the Sagnac effect, this difference is proportional to the angular velocity. Present resolution is limited by thermal drifts in frequency pulling, itself reflecting mirror backscatter. The capability of ring lasers for measurements of geodesic interest, including seismometry and earth tides, and for detection of other sources of nonreciprocal refractive indices, including axions and CP violation, are discussed. In standard polarization geometries the observable is necessarily time-reversal odd. Scaling rules for dimensions, finesse etc summarizing past progress and suggesting future potential are given.

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“…Incidentally, relations of this type are also of importance in discussions of time-reversal violation in high-temperature superconductors (e.g. Halperin 1990, Shelankov and Pikus 1992, Lawrence et al 1992; also see Stedman et al (1995) for a related discussion).…”

Section: And References Therein)mentioning

confidence: 99%

Onsager relations and time-reversal symmetry in nonlinear optics

Naguleswaran

Stedman

1998

J. Phys. B: At. Mol. Opt. Phys.

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Results following from time-reversal symmetry are developed for those nonlinear optical processes where a statistical average is required. These generalize previous analyses by removing the electric dipole approximation and allowing for intermediate resonances. For example, Onsager relations for self-conjugate nonlinear optical processes (when input and output photons form degenerate pairs) are derived and associated reversality relations generalized. In the nonresonant limit magnetic-dipole but not electric-quadrupole terms in coherent processes are suppressed. For general processes purely electric dipole contributions to natural optical activity are possible when intermediate resonances are present.

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T violation and microhertz resolution in a ring laser

Cited by 13 publications

References 13 publications

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

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

Ring-laser tests of fundamental physics and geophysics

Onsager relations and time-reversal symmetry in nonlinear optics

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