Mirrors movement-induced equivalent rotation effect in ring laser gyros

Lu, Guangfeng; Fan, Zhenfang; Hu, Shaomin; Luo, Hui

doi:10.1364/oe.21.014458

Cited by 7 publications

(4 citation statements)

References 5 publications

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“…Although the angle error caused by the periodic rotation noise averages to zero in long-time navigation applications, it cannot be neglected for low-noise pointing and tracking applications. This error effect on MRLGs performance exhibits the similar characteristics as the effect of the equivalent rotation presented in [27]. This study indicates that crosstalk between two beat-frequency signals can induce substantial angular error and should be carefully controlled in MRLGs; especially MRLGs are used in micro-vibration measurement and control of optical remote sensing satellite.…”

Section: Discussionsupporting

confidence: 61%

Periodic rotation noise induced by the crosstalk between two beat-frequency signals in multi-oscillator ring laser gyros

Lu¹,

Wang²,

Fan³

et al. 2014

J. Opt.

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Periodic rotation noise in the outputs of multi-oscillator ring laser gyros (MRLGs) is investigated in this paper for the first time. It is proved theoretically and experimentally that noise is induced by the crosstalk between two beat-frequency signals, which are combined from the left and right circularly polarized counter-propagating beams in MRLGs. Theoretical analysis and experimental results also indicate that the fundamental frequency of this noise is equal to the frequency difference between the two beat-frequency signals and the amplitude of the fundamental component is proportional to the crosstalk ratio between the two beat-frequency signals. Further, the amplitude of the nth-order component is proportional to the nth power of the crosstalk ratio.

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Section: Discussionsupporting

confidence: 61%

Periodic rotation noise induced by the crosstalk between two beat-frequency signals in multi-oscillator ring laser gyros

Lu¹,

Wang²,

Fan³

et al. 2014

J. Opt.

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“…A detailed study of the effects of geometrical distortions on the optical path is the first necessary step toward the active control of mirror positions. In the literature, one can find many papers about the geometry of a ring cavity [9][10][11][12][13][14][15]. In this paper, we address for the first time the problem of finding a suitable approach to minimizing the scale factor k S variations, and pose the basis for the control of a heterolithic ring laser cavity.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the geometrical stability in square ring laser gyroscopes

Santagata

Beghi

Belfi

et al. 2015

Class. Quantum Grav.

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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: the project name is GINGER (Gyroscopes IN GEneral Relativity), a ground-based triaxial array of ring lasers aiming at measuring the Earth rotation rate with an accuracy of 10 −14 rad/s. Such ambitious goal is now within reach as large area ring lasers are very close to the necessary sensitivity and stability. However, demanding constraints on the geometrical stability of the laser optical path inside the ring cavity are required. Thus we have started a detailed study of the geometry of an optical cavity, in order to find a control strategy for its geometry which 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 which 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.

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“…The traditional He-Ne ring laser is a mature technology which has been successfully used in ring laser gyros. In those gyros, a rotation will result in a frequency difference between two counter-propagating traveling waves in a He-Ne ring laser [15,16]. Introducing anomalous dispersion into the He-Ne ring laser will be convenient for the scale factor enhancements of the present gyros.…”

Section: Introductionmentioning

confidence: 99%

Theoretical design of a superluminal helium–neon ring laser via coupled passive cavities

Han¹,

Luo²,

Qu³

et al. 2014

J. Opt.

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A helium–neon ring laser cavity is modified by employing variable coupled passive cavities to introduce anomalous dispersion. An equivalent model for the coupled cavities is proposed, and new equations are performed. Theoretical analysis of the parameters is presented in detail, and a novel iterative method is proposed. Gyros using this ring laser are shown in different sensitivity enhancements with limited broadened passive cavity line-width, and the minimal measurable rotation rate is analyzed. The related quantum noise limited line-width is found to be broadened with limitations, which mainly depend on the round trip loss. Fluctuations are induced to analyze parameter influences on enhancements, and a novel modification method concerning mirror reflectivity is proposed for experimental setups. Finally several practical considerations are generally discussed, and some suggestions are proposed for realization. This fast light induced enhancement can be important for present gyros based on a He–Ne ring laser.

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Mirrors movement-induced equivalent rotation effect in ring laser gyros

Cited by 7 publications

References 5 publications

Periodic rotation noise induced by the crosstalk between two beat-frequency signals in multi-oscillator ring laser gyros

Periodic rotation noise induced by the crosstalk between two beat-frequency signals in multi-oscillator ring laser gyros

Optimization of the geometrical stability in square ring laser gyroscopes

Theoretical design of a superluminal helium–neon ring laser via coupled passive cavities

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