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Journal articles on the topic 'Sagnac effect'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 May 2024

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1

Persson, John-Erik. "The misunderstood Sagnac effect." Physics Essays 34, no. 4 (December 19, 2021): 480–85. http://dx.doi.org/10.4006/0836-1398-34.4.480.

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The Sagnac effect of first order (in one-way light) is shown to explain the aberration observed in the very long base interferometry tests. This fact is also consistent with Sagnac’s results and with the observed stellar aberration. The Sagnac effect of second order (in two-way light) is shown to be real, but not observable, in the experiments that were done by Michelson and Morley. However, it is also shown that the same second order effect is observable in the Pioneer anomaly. The Doppler effect of second order is also demonstrated to explain the cosmic red shift, due to a radial ether wind.

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2

Hasselbach, F., and M. Nicklaus. "Phase Shift of Electron Waves in A Rotating Frame of Reference." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 1 (August 12, 1990): 212–13. http://dx.doi.org/10.1017/s0424820100179816.

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After the first matter wave version of Sagnac’s classical light optical experiment of 1913, performed by Mercereau and Zimmermann with electron Cooper pairs in 1965, and the Sagnac experiment realized with neutrons by Werner et al. in 1979 , we report here on the first observation of the rotational phase shift of electron waves in vacuum.Theory. The Sagnac effect links classical physics, quantum physics and relativity. Using the special theory of relativity it can be derived that coherent waves, e.g. of light, neutrons or electrons, travelling around a finite area A experience a relative phaseshift

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3

Lin, Weihao, Yuhui Liu, Yibin Liu, Perry Ping Shum, and Mang I. Vai. "Fiber Temperature Sensor Based on Vernier Effect and Optical Time Stretching Method." Micromachines 13, no. 12 (December 14, 2022): 2215. http://dx.doi.org/10.3390/mi13122215.

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A novel method for ultra-sensitive and ultra-fast temperature sensing has been successfully implemented by cascading Saganc rings to generate the Vernier effect and doing the same dispersive fibers to achieve the optical time-stretching effect. This is different from the traditional point fiber sensor demodulated by optical spectrum analyzer (OSA) whose demodulation speed is usually at the second level. The designed system maps the wavelength domain to the time domain through the dispersive fiber, which can realize the ultra-fast temperature monitoring at the nanosecond level. The cascaded Sagnac ring is composed of polarization maintaining fiber (PMF) which is significantly affected by the thermal-optical coefficient. When the temperature changes, the variation is as high as −6.228 nm/°C, which is 8.5 times higher than the sensitivity based on the single Sagnac ring system. Furthermore, through the optical time stretching scheme, the corresponding response sensitivity is increased from 0.997 ns/°C to 7.333 ns/°C, and the magnification is increased 7.4 times with a response speed of 50 MHz.

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4

RAYCHAUDHURI, B. "SAGNAC EFFECT IN (2+1)-DIMENSIONAL GRAVITATIONAL FIELD." Modern Physics Letters A 29, no. 03 (January 27, 2014): 1450014. http://dx.doi.org/10.1142/s021773231450014x.

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A Sagnac type experiment is analyzed in the most well-known (2+1)-dimensional Bañados, Teitelboim and Zanelli (BTZ) spacetime and discussed vis-a-vis corresponding results in (3+1)-dimensional spacetime. The angular velocity of locally non-rotating observer has formally been predicted using Sagnac effect. Occurrence of arbitrarily large Sagnac delay (SD) for geodesic motion is observed for extreme BTZ black hole universally as its remarkable feature.

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5

Mei, Xiaochun. "The Truth of the Experiments of Invariable Speed of Light in Special Relativity." Applied Physics Research 15, no. 2 (October 19, 2023): 116. http://dx.doi.org/10.5539/apr.v15n2p116.

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It is pointed out that the most experiments on the invariant speed of light in special relativity proves the round-trip invariant speed of light, not one-way invariant. This paper makes a distinction between them. The Michelson-Morley experiment and the experiment of high-energy particles emitting photons and so on are the round-trip experiment of light’s speed, showing that the average speed of light is a constant. But the Sagnac effect experiment, the Michelson-Gale's experiment that the earth's rotation effects the speed of light, and the satellite signal propagation between China and Japan are the one-way experiments of light’s speed, showing that the speed of light is variable, satisfying the Galilean velocity addition rule. The orbit shape changes of binary stars and the phenomenon of charm stars cannot be observed due to that the calculated observing directions are different from the practical observing direction for the observers on the Earth. The Fizeau water flow experiment and the Sagnac experiment are combined to prove that the rotation of optical fiber would affects the speed of light. The problem that the Sagnac effect is independent of the refractive index of optical fiber is explained well. It is proved that the Sagnac effect formula derived from special relativity is consistent with that derived from classical mechanics when the optical fiber’s refractive index . When , there is no the Sagnac effect according to special relativity. While according to classical mechanics, there is the Sagnac effect. The original experiment of Sagnac effect in 1913 was carried out in atmosphere with . Therefore, the original Sagnac experiment became a judgment experiment. It certainly jugated that the velocity of light satisfied the Galilean addition rule rather than the Lorentz transformation formula.

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6

Winterberg, F. "Substratum Interpretation of the Sagnac-and the Aharonov-Bohm Effect." Zeitschrift für Naturforschung A 44, no. 12 (December 1, 1989): 1145–50. http://dx.doi.org/10.1515/zna-1989-1202.

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Abstract It is shown that a substratum interpretation reveals a close relationship between the Sagnac- and the Aharonov-Bohm-effect. The characteristic peculiarity of the Aharonov-Bohm-effect, to produce a phase shift of the electron wave function even in the absence of any electromagnetic force fields, can be duplicated by a thought experiment for light waves in the gravitational field of a massive rotating cylinder, which demonstrates that the somewhat similar Sagnac-effect is not caused by centrifugal and Corioli’s forces, as it is sometimes claimed. In the substratum interpretation, both the Sagnac and Aharonov-Bohm effect find their explanation in a rotational motion of the substratum. If the substratum flow is irrotational, having the form of a potential vortex, these effects persist even though there are no force fields present.

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7

Stávek, Jiří. "ChatGPT on the Sagnac Effect." European Journal of Applied Physics 6, no. 2 (March 20, 2024): 19–25. http://dx.doi.org/10.24018/ejphysics.2024.6.2.307.

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This is my first attempt to communicate with the ChatGPT on the Sagnac effect. ChatGPT reviewed the history of this effect, responded with a list of important scholars in this field of research, gave a list of the most stimulating papers and mentioned also a list of alternative interpretations of the Sagnac effect together with some papers not so often cited. ChatGPT gave some proposals for future research in this field, how to penetrate deeper to the core of this effect. This could be a quick start in this field for newcomers.

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8

Zhu, X. D., E. K. Ko, G. Kimbell, and J. Robinson. "An optimized scheme for detecting magneto-optic effects in ultrathin films with Sagnac interferometry." Review of Scientific Instruments 93, no. 9 (September 1, 2022): 093101. http://dx.doi.org/10.1063/5.0090061.

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Sagnac interferometry is advantageous in measuring time-reversal-symmetry breaking effects in ferromagnetic and antiferromagnetic materials as it suppresses time-reversal symmetric birefringent effects that are ubiquitous and often overwhelming in optical detection systems. When its sensitivity is limited only by the amplifier noise in the photo-detector, one needs to optimize the optical power that returns to the detector. We demonstrate an experimental scheme that maximizes the returning optical power in a Sagnac interferometry when detecting the magneto-optic effect in ultrathin films. In this scheme, the optical beam bearing the Faraday effect on a thin film is reflected at a second surface coated with a highly reflective gold film. The gold film increases the returned optical power by a factor of 4–5. For a normal-incidence Sagnac interferometer, this scheme yields an increase in the signal-to-noise ratio by the same factor. For an oblique-incidence Sagnac interferometer, this scheme should yield an increase in the signal-to-noise ratio by a factor of 20–25. For illustration, this scheme is used to measure magnetization curves and Kerr rotation images of 4.5-unit-cell thick SrRuO3(001) grown on SrTiO3(001).

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9

Petrov, B. M. "Electrodynamic Theory of Sagnac Effect." Radioelectronics and Communications Systems 53, no. 10 (October 2010): 511–20. http://dx.doi.org/10.3103/s0735272710100018.

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10

Kajari, E., R. Walser, W. P. Schleich, and A. Delgado. "Sagnac Effect of Gödel's Universe." General Relativity and Gravitation 36, no. 10 (October 2004): 2289–316. http://dx.doi.org/10.1023/b:gerg.0000046184.03333.9f.

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11

Field, J. H. "The Sagnac and Hafele–Keating experiments: Two keys to the understanding of space–time physics in the vicinity of the Earth." International Journal of Modern Physics A 34, no. 33 (November 30, 2019): 1930014. http://dx.doi.org/10.1142/s0217751x1930014x.

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The role of preferred frames for light propagation and time dilation in the region of a massive, spherical, gravitating bodies, where according to general relativity, space–time curvature is described by the Schwarzschild metric equation, is discussed in the context of the Sagnac effect (for light propagation) and the Hafele–Keating experiment (for time dilation). Predictions for both translational and rotational motion relative to the preferred frame are calculated up to order [Formula: see text]. Different published theoretical calculations of the Sagnac effect are critically reviewed. The conflation in the literature of measured time differences in Sagnac experiments (a classical order [Formula: see text] effect) and time dilation (a relativistic order [Formula: see text] effect) are also discussed.

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12

Henriksen, R. N., and L. A. Nelson. "Clock synchronization by accelerated observers: metric construction for arbitrary congruences of world lines." Canadian Journal of Physics 63, no. 11 (November 1, 1985): 1393–404. http://dx.doi.org/10.1139/p85-232.

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This paper reviews the problem of synchronizing the clocks (locally orthogonalizing the three-space) of an arbitrarily accelerated observer congruence. A general solution is given that maintains the isotropy and coordinate independence of the one-way velocity of light, but various particular cases, such as the "rotating disc or ring" congruence, are also discussed in detail. The congruence-based space-time metric that is constructed by the Einstein synchronization procedure is given explicitly, and the Hamilton–Jacobi method is used to write a useful equation for the geodesics of this space-time.The formal theory is related to experimental efforts to establish synchronization to an accuracy of a few nanoseconds over the rotating earth (Costain et al. and Ashby and Allan). In particular, a formally correct derivation of the "Sagnac corrected time" is given, and the expected experimental consequences are reviewed and compared to current experimental results.The measurable "global Sagnac effect" is distinguished from the "local Sagnac effect", which is, in fact, indistinguishable from Einstein synchronization. This clarifies earlier discussion concerning an orbital experiment proposed by Cohen and Moses.A suggestion regarding the application of absolute phase, very long baseline, radio interferometry to the measurement of the Sagnac effect (and possibly higher order effects) is given briefly.

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13

Choi, Yang-Ho. "Theoretical analysis of generalized Sagnac effect in the standard synchronization." Canadian Journal of Physics 95, no. 8 (August 2017): 761–66. http://dx.doi.org/10.1139/cjp-2016-0953.

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The Sagnac effect has been shown in inertial frames as well as rotating frames. We solve the problem of the generalized Sagnac effect in the standard synchronization of clocks. The speed of a light beam that traverses an optical fiber loop is measured with respect to the proper time of the light detector, and is shown to be other than the constant c, though it appears to be c if measured by the time standard-synchronized. The fiber loop, which can have an arbitrary shape, is described by an infinite number of straight lines such that it can be handled by the general framework of Mansouri and Sexl (MS). For a complete analysis of the Sagnac effect, the motion of the laboratory should be taken into account. The MS framework is introduced to deal with its motion relative to a preferred reference frame. Though the one-way speed of light is other than c, its two-way speed is shown to be c with respect to the proper time. The theoretical analysis of the generalized Sagnac effect corresponds to the experimental results, and shows the usefulness of the standard synchronization. The introduction of the standard synchrony can make mathematical manipulation easy and can allow us to deal with relative motions between inertial frames without information on their velocities relative to the preferred frame.

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14

Karimov, R. Kh, and R. N. Izmailov. "SAGNAC EFFECT IN THE ROTATING BLACK HOLE SPACE-TIME IN THE FOUR-DIMENSIONAL EINSTEIN-GAUSS-BONNET THEORY." Izvestia Ufimskogo Nauchnogo Tsentra RAN, no. 1 (March 12, 2024): 35–40. http://dx.doi.org/10.31040/2222-8349-2024-0-1-35-40.

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Recently, Glavan and Lin proposed a new four-dimensional theory of Einstein-Gauss-Bonnet (EGB) gravity by rescaling the Gauss-Bonnet (GB) coupling constant ߙ→ ܦ(/ߙ− 4) and adopting the ܦ→ 4 constraint at the level of the equations of motion. The GB coupling constant contributes to the field equations and thus bypasses Lovelock's theorem. This theory preserves the number of degrees of freedom and avoids Ostrogradsky instability. Glavan and Lin obtained an exact solution for nonsingular static and spherically symmetric black holes in the four-dimensional EGB theory of gravity. Later, Kumar and Ghosh applied the Newman-Janis algorithm to the static solution and constructed a solution for a rotating black hole in the 4-dimensional EGB theory of gravity. Since the theory solves many observational problems in astrophysics and is promising for research, the influence of the GB coupling parameter on astrophysical effects is actively studied in the literature. However, this theory has not been tested previously using time effects. The work examines one of the most interesting time effects – the Sagnac effect. Thus, the goal of the work is to study the Sagnac effect in the space-time of a rotating black hole in the four-dimensional EGB theory and obtain a constraint on the GB coupling parameter using observational data of the Sagnac effect. In the most general case, the Sagnac effect is understood as the difference in the time it takes light beams moving in opposite directions to pass through a closed circle. The effect has many applications, is observable on Earth and is taken into account in satellite navigation systems (GPS, GLONASS) when synchronizing time signals.

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15

Mazurova, E. M., and A. N. Petrov. "Theoretical substantiations of the Sagnac effect." Geodesy and Cartography 988, no. 10 (November 20, 2022): 2–8. http://dx.doi.org/10.22389/0016-7126-2022-988-10-2-8.

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It is the first article of the two ones related to the Sagnac effect, the one of the main relativistic effects to be taken into account for synchronization of clocks in working global navigation satellite systems. Its sense consists of retarding/advancing signals propagating in opposite directions at the perimeter of a rotating disc. In the present article its theoretic foundation is given both within the framework of a kinematical effect in special relativity and in that of general relativity, where the effect is analyzed as a result of centrifugal forces potential’s action. Besides, in both the theories two various approaches are applied. This enables delving into physical sense of the phenomenon. This theoretical presentation is used in the second article of the series to outline the effect under real conditions at location on the surface of rotating Earth, when optical fiber link is used for synchronization of atomic clocks.

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16

Mazurova, E. M., and A. N. Petrov. "The Sagnac effect in optic fiber link synchronization of high-precision frequency standards." Geodesy and Cartography 990, no. 12 (January 20, 2023): 12–21. http://dx.doi.org/10.22389/0016-7126-2022-990-12-12-21.

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This is the second of the two articles on the Sagnac effect, one of the main relativistic effects. Its idea is retarding (advancing) signals propagating in opposite directions throughout the perimeter of a rotating disc. In the first article its theoretical substantiation was presented. These calculations make the basis for this paper to be used for describing the effect under real conditions on the surface of the rotating Earth. An optical fiber is to distribute the signal. A relativistic equation is written for a wave propagating in an optical fiber, which is used on the Earth`s surface to synchronize high-precision frequency standards. This formula is analyzed, the level of contributions of various relativistic effects is estimated, and the Sagnac’s is singled out as the main one. A joint consideration of the theoretical foundations and the influence of the phenomenon in applied tasks will be good for solving the matter of synchronizing high-precision frequency standards in a complex way.

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17

Popov, Nikolay, and Ivan Matveev. "Noninertial Proper Motions of the Minkowski Metric, the Sagnac Effect, and the Twin Paradox." Axioms 12, no. 6 (May 30, 2023): 537. http://dx.doi.org/10.3390/axioms12060537.

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The Sagnac effect and related twin paradox with a rotating disc are analyzed. It may seem that the special theory of relativity gives an easy and exhaustive treatment here. However, such consideration is deceptive since the principles of special relativity are originally established only for the inertial frames of reference, whereas the Sagnac experiment and the twin paradox exist in a noninertial one. We introduce an additional group of motions related to the rotation with uniform angular speed and show that these transformations leave the Minkowski metric invariant. Thus, we can give a firm mathematical ground to a usual easy consideration of the Sagnac effect. It should be noted that the presented result is true for a special case of motions; general coordinate transformations into accelerating frames of reference do not preserve the metric.

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18

Malykin, Grigorii B. "Earlier studies of the Sagnac effect." Uspekhi Fizicheskih Nauk 167, no. 3 (1997): 337. http://dx.doi.org/10.3367/ufnr.0167.199703i.0337.

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19

Liu, Yuhui, Weihao Lin, Jie Hu, Fang Zhao, Feihong Yu, Shuaiqi Liu, Jinna Chen, Huanhuan Liu, Perry Ping Shum, and Xuming Zhang. "Integrated Fiber Ring Laser Temperature Sensor Based on Vernier Effect with Lyot–Sagnac Interferometer." Sensors 23, no. 14 (July 24, 2023): 6632. http://dx.doi.org/10.3390/s23146632.

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The Vernier effect created using an incorporated Lyot–Sagnac loop is used to create an ultra-high sensitivity temperature sensor based on a ring laser cavity. Unlike standard double Sagnac loop systems, the proposed sensor is fused into a single Sagnac loop by adjusting the welding angle between two polarization-maintaining fibers (PMFs) to achieve effective temperature sensitivity amplification. The PMFs are separated into two arms of 0.8 m and 1 m in length, with a 45° angle difference between the fast axes. The sensor’s performance is examined both theoretically and experimentally. The experimental results reveal that the Vernier amplification effect can be achieved via PMF rotating shaft welding. The temperature sensitivity in the laser cavity can reach 2.391 nm/°C, which is increased by a factor of more than eight times compared with a single Sagnac loop structure (0.298 nm/°C) with a length of 0.8 m without the Vernier effect at temperatures ranging from 20 °C to 30 °C. Furthermore, unlike traditional optical fiber sensing that uses a broadband light source (BBS) for detection, which causes issues such as low signal-to-noise ratio and broad bandwidth, the Sagnac loop can be employed as a filter by inserting itself into the fiber ring laser (FRL) cavity. When the external parameters change, the laser is offset by the interference general modulation, allowing the external temperature to be monitored. The superior performance of signal-to-noise ratios of up to 50 dB and bandwidths of less than 0.2 nm is achieved. The proposed sensor has a simple structure and high sensitivity and is expected to play a role in biological cell activity monitoring.

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Malykin, Grigorii B. "The Sagnac effect: correct and incorrect explanations." Uspekhi Fizicheskih Nauk 170, no. 12 (2000): 1325. http://dx.doi.org/10.3367/ufnr.0170.200012c.1325.

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21

Frauendiener, J. "Gravitational waves and the Sagnac effect." Classical and Quantum Gravity 37, no. 5 (February 6, 2020): 05LT01. http://dx.doi.org/10.1088/1361-6382/ab574c.

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22

Malykin, Grigorii B. "Earlier studies of the Sagnac effect." Physics-Uspekhi 40, no. 3 (March 31, 1997): 317–21. http://dx.doi.org/10.1070/pu1997v040n03abeh000218.

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23

Bhadra, A., T. B. Nayak, and K. K. Nandi. "String corrections to the Sagnac effect." Physics Letters A 295, no. 1 (March 2002): 1–7. http://dx.doi.org/10.1016/s0375-9601(02)00132-9.

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24

Takahashi, Yoshinaga. "The Sagnac effect on the wavefunction." Physics Letters A 113, no. 1 (November 1985): 5–7. http://dx.doi.org/10.1016/0375-9601(85)90594-8.

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25

Bretenaker, F., J. P. Taché, and A. Le Floch. "Reverse Sagnac Effect in Ring Lasers." Europhysics Letters (EPL) 21, no. 3 (January 20, 1993): 291–97. http://dx.doi.org/10.1209/0295-5075/21/3/007.

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26

Tartaglia, Angelo, and Matteo Luca Ruggiero. "The Sagnac effect and pure geometry." American Journal of Physics 83, no. 5 (May 2015): 427–32. http://dx.doi.org/10.1119/1.4904319.

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27

Kesteven, MJ. "Interferometers, Aberration and the Sagnac Effect." Australian Journal of Physics 40, no. 3 (1987): 435. http://dx.doi.org/10.1071/ph870435.

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In this note we show that the usual expression for diurnal aberration (see e.g. Woolard and Clemence 1966) is not valid for some types of radio interferometers. The difference (usual minus correct) is a constant of the instrument, and is absorbed in the calibration procedure. The analysis of multibaseline VLBI may also be affected.

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28

Wang, Xue-Zhou, and Qi Wang. "A High-Birefringence Microfiber Sagnac-Interferometer Biosensor Based on the Vernier Effect." Sensors 18, no. 12 (November 23, 2018): 4114. http://dx.doi.org/10.3390/s18124114.

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We propose a high-sensitive Sagnac-interferometer biosensor based on theVernier effect (VE) with a high-birefringence microfiber. The sensitivity enhancement is achieved by utilizing two cascaded Sagnac interferometers. One of the two interference loops consists of a panda polarization-maintaining fiber as a filter, whilst the other is comprised of high-birefringent microfiber coated Graphene oxide (GO) as a sensing channel. We theoretically analyzed the sensitivity of the sensor and verified it with experiments. The results of the simulation show that the refractive index sensitivity is more than five times that of the fiber sensor based on a single Sagnac loop. The sensitivity of the refractive index in the experiments can reach 2429 nm/refractive index unit (RIU), which is basically in accordance with the simulation. We also use electrostatic adsorption to coat GO on the surface of the sensing channel. GO is employed to adsorb bovine serum albumin (BSA) molecules to achieve the desired detection results, which has good biocompatibility and large specific surface area. The sensitivity to detect BSA can reach 9.097 nm/(mg×mL−1).

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Yu, Yuanyuan, Hao Luo, Buyun Chen, Jin Tao, Zhihong Feng, Hao Zhang, Wenlan Guo, and Daihua Zhang. "MEMS Gyroscopes Based on Acoustic Sagnac Effect." Micromachines 8, no. 1 (December 24, 2016): 2. http://dx.doi.org/10.3390/mi8010002.

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30

Malykin, Grigorii B. "The Sagnac effect: correct and incorrect explanations." Physics-Uspekhi 43, no. 12 (December 31, 2000): 1229–52. http://dx.doi.org/10.1070/pu2000v043n12abeh000830.

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31

Malykin, G. B. "Sagnac effect and Ritz ballistic hypothesis (Review)." Optics and Spectroscopy 109, no. 6 (December 2010): 951–65. http://dx.doi.org/10.1134/s0030400x10120209.

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32

Lefevre, H. "Sagnac effect analysis: optical fiber gyrometers example." Journal of Optics 19, no. 3 (May 1988): 117–21. http://dx.doi.org/10.1088/0150-536x/19/3/002.

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33

Su, C. C. "On the Sagnac Effect in Wave Propagation." Journal of Electromagnetic Waves and Applications 15, no. 7 (January 2001): 945–55. http://dx.doi.org/10.1163/156939301x00904.

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34

MOROZOVA, V. S., and B. J. AHMEDOV. "QUANTUM INTERFERENCE EFFECTS IN SLOWLY ROTATING NUT SPACE–TIME." International Journal of Modern Physics D 18, no. 01 (January 2009): 107–18. http://dx.doi.org/10.1142/s0218271809014352.

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General relativistic quantum interference effects in a slowly rotating NUT space–time, such as the Sagnac effect and the phase shift effect of interfering particles in a neutron interferometer, are considered. It was found that in the case of the Sagnac effect, the influence of the NUT parameter is becoming important due to the fact that the angular velocity of the locally nonrotating observer must be larger than the one in the Kerr space–time. In the case of neutron interferometry, it is found that due to the presence of the NUT parameter, an additional term in the phase shift of interfering particles emerges. This term can be, in principle, detected by a sensitive interferometer and the derived results could be further used in experiments to detect the gravitomagnetic charge. Finally, as an example, we apply the obtained results to the calculation of the UCN (ultra-cold neutrons) energy level modification in a slowly rotating NUT space–time.

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NANDAN, A., M. SABUNCU, J. HEERSINK, O. GLÖCKL, G. LEUCHS, and U. L. ANDERSEN. "ALL-FIBRE SOURCE OF CONTINUOUS VARIABLE ENTANGLED LIGHT." International Journal of Modern Physics B 20, no. 11n13 (May 20, 2006): 1280–86. http://dx.doi.org/10.1142/s0217979206033917.

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We experimentally demonstrate the production of continuous variable entanglement of femto second laser pulses from an all-fibre asymmetric Sagnac interferometer exploiting the Kerr effect. Contrary to the experiment of Silberhorn et al. [Phys. Rev. Lett. 86, 4267 (2001)], the asymmetric coupler in the Sagnac loop is fully integrated in the fibre, making the source extremely compact, reliable and robust. Employing a simple detection scheme, comprising a beam splitter and two intensity detectors, we clearly observe quantum correlations of conjugate quadratures, hereby witnessing entanglement.

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Zhou, Junpeng, Zhengrong Tong, Weihua Zhang, Xue Wang, Xiang Gao, Qiuhao Jiang, and Gangxiao Yan. "A C-band widely tunable and switchable erbium-doped fiber laser based on a Sagnac-like loop embedded in Lyot filter." Laser Physics 33, no. 7 (May 22, 2023): 075102. http://dx.doi.org/10.1088/1555-6611/acce2c.

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Abstract In this paper, a new type of widely tunable and switchable multi-wavelength erbium-doped fiber laser based on a Sagnac-like loop embedded in Lyot filter is proposed. The nonlinear polarization rotation effect is obtained by adjusting two polarization controllers (PCs). The polarization-dependent isolator and the Sagnac-like loop are used as the basic structure to realize the wide tuning and wavelength switching in C-band. Compared with the traditional Lyot filter, the Sagnac-like loop is used to replace the segment of polarization-maintaining fiber, and a more uniform comb spectrum can be obtained by this filter. The tunable and switchable wavelengths can be achieved by adjusting the PCs based on the nonlinear effect of the loop. The laser can emit single-, dual-, triple-, quad- and quintuple-wavelengths. The optical signal-to-noise ratios all exceed 43 dB. It can also be adjusted to partial wavelength intervals for quad-wavelength and quintuple-wavelength. The tuning range can reach the full range of the C-band, and the laser efficiency can reach the practical application standard. It can be applied to some precision instruments and equipment.

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37

Soleimani, M. J., N. Abbasvandi, G. Gopir, Zainol Abidin Ibrahim, Shahidan Radiman, and W. A. T. Wan Abdullah. "Natural cutoffs effect on charged rotating TeV-scale black hole thermodynamics." International Journal of Modern Physics D 26, no. 06 (October 14, 2016): 1750043. http://dx.doi.org/10.1142/s0218271817500432.

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We study the thermodynamics of charged rotating black hole in large extra dimensions scenario where quantum gravity effects are taken into account. We consider the effects of minimal length, minimal momentum, and maximal momentum as natural cutoffs on the thermodynamics of charged rotating TeV-scale black holes. In this framework, the effect of the angular momentum and charge on the thermodynamics of the black hole are discussed. We focus also on frame dragging and Sagnac effect of the micro black holes.

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Logunov, Anatolii A., and Yu V. Chugreev. "Special theory of relativity and the Sagnac effect." Uspekhi Fizicheskih Nauk 156, no. 9 (1988): 137–43. http://dx.doi.org/10.3367/ufnr.0156.198809e.0137.

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Gift, Stephan J. G. "Inconsistency in relativistic derivations of the Sagnac effect." Physics Essays 31, no. 2 (June 29, 2018): 228–32. http://dx.doi.org/10.4006/0836-1398-31.2.228.

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KAPITULNIK, A. "HIGH RESOLUTION MAGNETO-OPTICS USING THE SAGNAC EFFECT." Journal of the Magnetics Society of Japan 19, S_1_MORIS_94 (1995): S1_407–408. http://dx.doi.org/10.3379/jmsjmag.19.s1_407.

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Krakenes, K., and K. Blotekjaer. "Effect of laser phase noise in Sagnac interferometers." Journal of Lightwave Technology 11, no. 4 (April 1993): 643–53. http://dx.doi.org/10.1109/50.248130.

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Wang Xiaozhang, 王晓章, 蒋军彪 Jiang Junbiao, 李毅 Li Yi, 李睿 Li Rui, 张辉 Zhang Hui, 李晓 Li Xiao, 龙鹏翼 Long Pengyi, and 唐峰 Tang Feng. "Effect of Shock on Sagnac Fiber Interferometer Performance." Chinese Journal of Lasers 44, no. 7 (2017): 0706003. http://dx.doi.org/10.3788/cjl201744.0706003.

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43

Logunov, Anatolii A., and Yu V. Chugreev. "Special theory of relativity and the Sagnac effect." Soviet Physics Uspekhi 31, no. 9 (September 30, 1988): 861–64. http://dx.doi.org/10.1070/pu1988v031n09abeh005624.

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44

Lai, Yu-Hung, Yu-Kun Lu, Myoung-Gyun Suh, Zhiquan Yuan, and Kerry Vahala. "Observation of the exceptional-point-enhanced Sagnac effect." Nature 576, no. 7785 (December 4, 2019): 65–69. http://dx.doi.org/10.1038/s41586-019-1777-z.

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45

Anderson, R., H. R. Bilger, and G. E. Stedman. "‘‘Sagnac’’ effect: A century of Earth‐rotated interferometers." American Journal of Physics 62, no. 11 (November 1994): 975–85. http://dx.doi.org/10.1119/1.17656.

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Vugal’ter, G. A., and G. B. Malykin. "Sagnac effect in ring interferometers on “slow” waves." Radiophysics and Quantum Electronics 42, no. 4 (April 1999): 333–41. http://dx.doi.org/10.1007/bf02677577.

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47

Serret, Olivier. "A Non-Relativistic Explanation of the Sagnac Effect." Journal of Modern Physics 10, no. 05 (2019): 500–514. http://dx.doi.org/10.4236/jmp.2019.105035.

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MAMADJANOV, A. I., A. A. HAKIMOV, and S. R. TOJIEV. "QUANTUM INTERFERENCE EFFECTS IN SPACETIME OF SLOWLY ROTATING COMPACT OBJECTS IN BRANEWORLD." Modern Physics Letters A 25, no. 04 (February 10, 2010): 243–56. http://dx.doi.org/10.1142/s0217732310032482.

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The relativistic quantum interference effects in the spacetime of slowly rotating object in braneworld as the Sagnac effect and phase shift effect of interfering particle in neutron interferometer are derived in unified way. It is found that in the case of the Sagnac effect, the influence of brane parameter is becoming important due to the fact that the angular velocity of the locally non-rotating observer is increased by the brane tension. In the case of neutron interferometry, it is found that an additional term in the phase shift of interfering particle emerges due to the presence of the brane parameter Q*. From the obtained expressions of phase shift in Mach–Zehnder interferometer upper limit for brane parameter has been estimated. From the results of the recent experiments we have obtained upper limit for the tidal charge as Q* ≲ 107 cm 2. Finally, as an example, we apply the obtained results to the calculation of the (ultra-cold neutrons) energy level modification in the gravitational field of slowly rotating gravitating object in the braneworld.

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Spavieri, Gianfranco, and Espen Gaarder Haug. "Why the Sagnac effect favors absolute over relative simultaneity." Physics Essays 32, no. 3 (September 29, 2019): 331–37. http://dx.doi.org/10.4006/0836-1398-32.3.331.

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We consider a thought experiment, equivalent to the Sagnac effect, where a light signal performs a round trip over a closed path. If special relativity (SR) adopts Einstein synchronization, the result of the experiment shows that the local light speed cannot be c in every section of the closed path. No inconsistencies are found when adopting absolute synchronization. Since Einstein and absolute synchronizations can be discriminated, the conventionality of the one-way speed of light holds no longer. Thus, as sustained by specialists, it might be a viable formulation of SR that reinstates the conservation of simultaneity, even though it allows for relativistic effects, such as time dilation. Such an approach may lead to the discovery of new effects and a better understanding of relativistic theories.

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HAKIMOV, ABDULLO, BOBUR TURIMOV, AHMADJON ABDUJABBAROV, and BOBOMURAT AHMEDOV. "QUANTUM INTERFERENCE EFFECTS IN HOŘAVA–LIFSHITZ GRAVITY." Modern Physics Letters A 25, no. 37 (December 7, 2010): 3115–27. http://dx.doi.org/10.1142/s0217732310034328.

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The relativistic quantum interference effects in the spacetime of slowly rotating object in the Hořava–Lifshitz gravity as the Sagnac effect and phase shift of interfering particle in neutron interferometer are derived. We consider the extension of Kehagias–Sfetsos (KS) solution48 in the Hořava–Lifshitz gravity for the slowly rotating gravitating object. Using the covariant Klein–Gordon equation in the nonrelativistic approximation, it is shown that the phase shift in the interference of particles includes the gravitational potential term with the KS parameter ω. It is found that in the case of the Sagnac effect, the influence of the KS parameter ω is becoming important due to the fact that the angular velocity of the locally non-rotating observer is increased in Hořava gravity. From the results of the recent experiments50 we have obtained lower limit for the coupling KS constant as ω ≃ 1.25 ⋅10-25 cm -2. Finally, as an example, we apply the obtained results to the calculation of the UCN (ultra-cold neutrons) energy level modification in the gravitational field of slowly rotating gravitating object in the Hořava–Lifshitz gravity.

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