Ring-laser gyroscope without the lock-in phenomenon

Sunada, Satoshi; Tamura, Shinichi; Inagaki, Keizo; Harayama, Takahisa

doi:10.1103/physreva.78.053822

Cited by 33 publications

(15 citation statements)

References 24 publications

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“…Accordingly, it was not obvious that optical gyroscopes could work with semiconductor materials instead of with gases. For the ring laser gyroscopes with a semiconductor active lasing medium that is realized by the combination of a semiconductor optical amplifier with a ring resonator formed by optical fibers, the frequency splitting proportional to the rotation rate has been experimentally observed [147]. Therefore, it might be possible to observe the frequency splitting due to the rotation using a semiconductor laser gyroscope on a chip.…”

Section: Laser and Photonics Reviewsmentioning

confidence: 99%

Two‐dimensional microcavity lasers

Harayama¹,

Shinohara

2011

Laser & Photonics Reviews

126

107

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Advances in processing technology, such as quantum-well structures and dry-etching techniques, have made it possible to create new types of two-dimensional (2D) microcavity lasers which have 2D emission patterns of output laser light although conventional one-dimensional (1D) edge-emitting-type lasers have 1D emission. Two-dimensional microcavity lasers have given nice experimental stages for fundamental researches on wave chaos closely related to quantum chaos. New types of 2D microcavity lasers also can offer the important lasing characteristics of directionality and high-power output light, and they may well find applications in optical communications, integrated optical circuits, and optical sensors. Fundamental physics of 2D microcavity lasers has been reviewed from the viewpoint of classical and quantum chaos, and recently developed theoretical approaches have been introduced. In addition, nonlinear dynamics due to the interaction among wave-chaotic modes through the active lasing medium is explained. Applications of 2D microcavity lasers for directional emission with strong light confinement are introduced, as well as high-precision rotation sensors designed by using wave-chaotic properties.A resonant mode of a stadium-shaped cavity showing wave chaos.

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Section: Laser and Photonics Reviewsmentioning

confidence: 99%

Two‐dimensional microcavity lasers

Harayama¹,

Shinohara

2011

Laser & Photonics Reviews

126

107

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“…It is similar to that developed in Refs. [10,11,27], but it is adopted to open cavities, taking into account the non-vanishing phases of the coupling constant g between the quasi-degenerate resonances ψ + , ψ − at rest and the difference of their complex resonant frequencies k + 0 , k − 0 , which we will show to be the key quantities that determine the different behaviors of the cavity decay rates mentioned above.…”

Section: Asymmetric Resonant Cavitiesmentioning

confidence: 99%

Rotation-induced mode coupling in open wavelength-scale microcavities

Sarma

Cao

2014

Phys. Rev. A

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We study the interplay between rotation and openness for mode coupling in wavelength-scale microcavities. In cavities deformed from a circular disk, the decay rates of a quasi-degenerate pair of resonances may cross or anti-cross with increasing rotation speed. The standing-wave resonances evolve to traveling-wave resonances at high rotation speed, however, both the clockwise (CW) and counter-clockwise (CCW) traveling-wave resonances can have a lower cavity decay rate, in contrary to the intuitive expectation from rotation-dependent effective index. With increasing rotation speed, a phase locking between the CW and CCW wave components in a resonance takes place. These phenomena result from the rotation-induced mode coupling, which is strongly influenced by the openness of the microcavity. The possibility of a non-monotonic Sagnac effect is also discussed.

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“…In Ref. [26] the authors extended it into the "dead zone" but only for a ring laser. The coupled-mode theory presented in the main text shows that a similar approach can be applied to open cavities, both in and beyond the "dead zone," and takes into account the phase of the coupling constant.…”

Section: Arxiv:14045289v1 [Physicsoptics] 21 Apr 2014mentioning

confidence: 99%

“…Below we employ a coupled-mode theory to capture this behavior, which is similar to that given in Refs. [3,4,26]. It applies both in and beyond the "dead zone" and takes into account the phase of the coupling constant.…”

Section: Arxiv:14045289v1 [Physicsoptics] 21 Apr 2014mentioning

confidence: 99%

Rotation-induced Asymmetry of Far-field Emission from Optical Microcavities

Sarma

Cao

2014

Frontiers in Optics 2014

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We study rotation-induced asymmetry of far-field emission from optical microcavities, based on which a new scheme of rotation detection may be developed. It is free from the "dead zone" caused by the frequency splitting of standing-wave resonances at rest, in contrast to the Sagnac effect. A coupled-mode theory is employed to provide a quantitative explanation and guidance on the optimization of the far-field sensitivity to rotation. We estimate that a 10 4 enhancement of the minimal detectable rotation speed can be achieved by measuring the far-field asymmetry, instead of the Sagnac effect, in microcavities 5 microns in radius and with distinct emission directions for clockwise and counterclockwise waves.Optical microcavities have found a wide range of applications from coherent light sources in integrated photonic circuits to cavity quantum electrodynamics, single-photon emitters, and biochemical sensors [1,2]. Recently they have also been proposed as a platform for rotation detection [3][4][5], replacing their tabletop counterparts in optical gyroscopes for reduced system size and weight [6][7][8][9][10][11][12][13]. An optical gyroscope utilizes the Sagnac effect [14][15][16][17][18], which manifests as a rotation-induced phase shift in a non-resonant structure or frequency splitting in a resonant cavity, between two counter-propagating waves. It has several advantages over its mechanical counterparts, including the absence of moving parts and system simplicity, with a high resolution typically less than 1 deg/h.The Sagnac effect is proportional to the size of the cavity, which puts optical microcavities at a serious disadvantage when compared with macroscopic cavities. Thus a new detection scheme is needed to make optical microcavities a viable option for rotation sensing. Previous studies [5,19] indicate that the quality (Q) factors of two counter-propagation modes also display a rotationinduced splitting, and its relative change can be much higher than that of the resonant frequencies. This enhancement however is still not large enough to compensate for the small size of microcavities, with a sensitivity still far below the Sagnac effect in macroscopic cavities.In this Letter we propose to use the asymmetry of the far-field emission pattern of deformed microcavity lasers as a measurable signature of rotation, which shows surprisingly high sensitivity. In a perfectly circular cavity, the output directionality of a resonance remains isotropic with rotation (see Appendix A). Therefore, we need to employ asymmetric resonant cavities (ARCs) [20][21][22] to obtain directional emission so that we can detect the change in output directionality by rotation. As the rotation speed increases, either the CW or CCW wave in a resonance gradually become the dominant component, * Electronic address: li.ge@csi.cuny.edu † Electronic address: hui.cao@yale.edu and consequently the far-field intensity pattern changes appreciably if the CW and CCW waves have very different output directionality. One well-studied non-rotating AR...

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Ring-laser gyroscope without the lock-in phenomenon

Cited by 33 publications

References 24 publications

Two‐dimensional microcavity lasers

Two‐dimensional microcavity lasers

Rotation-induced mode coupling in open wavelength-scale microcavities

Rotation-induced Asymmetry of Far-field Emission from Optical Microcavities

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