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Gotowa bibliografia na temat „Laser gyroscopes”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 11 lutego 2022

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Artykuły w czasopismach na temat "Laser gyroscopes"

Kudelin, Igor, Srikanth Sugavanam i Maria Chernysheva. "Rotation Active Sensors Based on Ultrafast Fibre Lasers". Sensors 21, nr 10 (19.05.2021): 3530. http://dx.doi.org/10.3390/s21103530.

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Gyroscopes merit an undeniable role in inertial navigation systems, geodesy and seismology. By employing the optical Sagnac effect, ring laser gyroscopes provide exceptionally accurate measurements of even ultraslow angular velocity with a resolution up to 10−11 rad/s. With the recent advancement of ultrafast fibre lasers and, particularly, enabling effective bidirectional generation, their applications have been expanded to the areas of dual-comb spectroscopy and gyroscopy. Exceptional compactness, maintenance-free operation and rather low cost make ultrafast fibre lasers attractive for sensing applications. Remarkably, laser gyroscope operation in the ultrashort pulse generation regime presents a promising approach for eliminating sensing limitations caused by the synchronisation of counter-propagating channels, the most critical of which is frequency lock-in. In this work, we overview the fundamentals of gyroscopic sensing and ultrafast fibre lasers to bridge the gap between tools development and their real-world applications. This article provides a historical outline, highlights the most recent advancements and discusses perspectives for the expanding field of ultrafast fibre laser gyroscopes. We acknowledge the bottlenecks and deficiencies of the presented ultrafast laser gyroscope concepts due to intrinsic physical effects or currently available measurement methodology. Finally, the current work outlines solutions for further ultrafast laser technology development to translate to future commercial gyroscopes.

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Alpert, Sofiia. "Main characteristics and perspectives of development of laser gyroscopes". Ukrainian journal of remote sensing 8, nr 1 (9.02.2021): 4–9. http://dx.doi.org/10.36023/ujrs.2021.8.1.186.

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Nowadays unmanned aerial vehicles (drones) are applied for solution numerous remote sensing tasks. They give a new opportunites for conducting environmental monitoring and give images with a very high resolution. Unmanned aerial vehicles are applied for solution numerous agricultural problems. They give a detail picture of fields. Unmanned aerial vehicles are used to help increase crop production. With technology constantly improving, imaging of the crops will need to improve as well.Digital images obtained by unmanned aerial vehicles (drones) can be used in forestry, they are used for environmental monitoring, plant health assessment and analysis of natural disasters. Unmanned aerial vehicles are also used for mining, they are applied for mapping deposit sites, exploring for oil and gas, surveying mines.Laser gyroscope is an essential component of a drones flight control system. Laser gyroscopes provides orientation control of drone and essential navigation information to the central flight control systems. Laser gyroscopes provide navigation information to the flight controller, which make drones easier and safer to fly. Laser gyroscope is one of the most important components, allowing the drone to fly smooth even in strong winds. The smooth flight capabilities allows us to get images with high precision.Nowadays the main function of gyroscope technologies is to improve the unmanned aerial vehicles flight capabilities. It was described a structure and main characteristics of laser gyroscopes. It was noted, that laser gyroscope is operated on the principle of the Sagnac effect. Sagnac effect is a phenomenon encountered in interferometry that is elicited by rotation. It were described main advantages and disadvantages of laser gyroscopes. A comparative analysis of mechanical and laser gyroscopes was carried out too.It also was noted, that laser gyroscopes are applied in different areas, such as: inertial navigation systems, aircraft, ships, unmanned aerial vehicles (drones) and satellites. Nowadays laser technology is developed further. There are all prerequisites for improving the precision and other technical characteristics of laser gyroscopes.

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Azarova, V. V., Yu D. Golyaev i I. I. Saveliev. "Zeeman laser gyroscopes". Quantum Electronics 45, nr 2 (27.02.2015): 171–79. http://dx.doi.org/10.1070/qe2015v045n02abeh015539.

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Azarova, V. V., Yu D. Golyaev i E. V. Kuznetsov. "Effect of Unequal Intensities of Counter-Propagating Waves on the Frequency Response of Laser Gyroscopes". Giroskopiya i Navigatsiya 28, nr 4 (2020): 71–81. http://dx.doi.org/10.17285/0869-7035.0050.

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Frequency response of a laser gyroscope was studies by numerical modelling of a complete system of equations describing it. The calculation results are compared to the results of experimental measurements taken on a precision dynamic test bench. The frequency response was measured for a gyroscope based on a four-mirror ring laser with a non-planar contour, operating on He-Ne active mix at the wavelength of 632.8 nm. In the gyroscope under study, the sign-variable dither was implemented on the basis of Zeeman magnetooptical effect. The relationship between the measured and designed values of the frequency response distortions has been found. The relationship between the frequency response distortions in a laser gyroscope and inequality of field intensities of the counterpropagating waves (CPW) has been numerically calculated and confirmed by experiments. Based on the research results, the parameters of a ring laser can be optimized to improve the accuracy of measurements by means of laser gyroscopes.

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Cui, Da Peng, Ying Xue Yao i Dong Li Qin. "Study on the Method for Measuring the Deflection Angle of a New Type Gyroscope Rotor". Key Engineering Materials 392-394 (październik 2008): 709–13. http://dx.doi.org/10.4028/www.scientific.net/kem.392-394.709.

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It is an important performance for gyroscopes to read out the angle information of the gyroscope rotor accurately. There are few methods for measuring the deflection angle of gyroscopes, and they are only fit for the special rotors. A new method based on laser triangulation with position sensitive device (PSD), and the calculation theory of measuring the deflection angle are presented in this paper, which is designed for measuring the deflection angle of a new type gyroscope rotor, and can improve the precision of measuring by several reflections. It indicates by calculation that the method presented in this paper is feasible, and the precision can be improved several times by many reflections, furthermore, the more the number of reflection is, the higher the precision of measurement is improved.

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Kolbas, Yu Yu, i M. A. Ivanov. "Improved Algorithm for Mathematical Correction of the Zero Drift of the Zeeman Laser Gyro with Switching Longitudinal Mode of Generation". Herald of the Bauman Moscow State Technical University. Series Instrument Engineering, nr 2 (125) (kwiecień 2019): 91–103. http://dx.doi.org/10.18698/0236-3933-2019-2-91-103.

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The paper addresses time and temperature zero drifts in Zeeman laser gyroscope (RLG) operating in the mode of periodic adjustment of RLG to the longitudinal mode of generation with the opposite circular polarization of the light wave. In such a gyroscope, the zero drift can be divided into magnetic and non-magnetic components having different nature and making a significantly different contribution to the final error. Algorithmic methods are proposed for mathematical compensation of RLG zero drift, both with and without using initial calibration. It is shown that the simultaneous use of reproducible dependencies of the magnetic and non-magnetic zero drifts due to RLG temperature changes allows solving the problem of RLG zero drift correction in the optimal way. The correction factors are calculated from the temperature of a Zeeman laser gyro at the moment of activation. At the same time, using the difference between the temperatures of the gyroscope and gyro case, where it is installed, it is possible to determine the temperature of the Zeeman laser gyroscope at the moment of switching on, thereby eliminating the problem of calculating the correction factors when the gyroscope is turned off and then on again. Experimental results for several Zeeman laser gyroscopes with typical values of zero drifts are presented

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Taguchi, Kozo, Kaname Fukushima, Atuyuki Ishitani i Masahiro Ikeda. "Fundamental Characteristics of Semiconductor Ring Laser Gyroscopes". IEEJ Transactions on Electronics, Information and Systems 119, nr 4 (1999): 447–51. http://dx.doi.org/10.1541/ieejeiss1987.119.4_447.

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Bohn, Matthew J., i Jean-Claude Diels. "Optimizing the frequency in dithered laser gyroscopes". Optics Communications 213, nr 4-6 (grudzień 2002): 331–37. http://dx.doi.org/10.1016/s0030-4018(02)02044-8.

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Coelho, Cláudio, Paulo Serra, Rita A. Ribeiro, R. A. Marques Pereira, Angela Dietz i Alessandro Donati. "Fuzzy Alarm System For Laser Gyroscopes Degradation". Intelligent Automation & Soft Computing 14, nr 3 (styczeń 2008): 351–66. http://dx.doi.org/10.1080/10798587.2008.10643000.

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Taguchi, Kozo, Kaname Fukushima, Atsuyuki Ishitani i Masahiro Ikeda. "Fundamental characteristics of semiconductor ring laser gyroscopes". Electrical Engineering in Japan 132, nr 4 (2000): 73–78. http://dx.doi.org/10.1002/1520-6416(200009)132:4<73::aid-eej9>3.0.co;2-e.

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Rozprawy doktorskie na temat "Laser gyroscopes"

Rabeendran, Nishanthan. "A Study of Ring Laser Gyroscopes". Thesis, University of Canterbury. Physics and Astronomy, 2008. http://hdl.handle.net/10092/1989.

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This thesis presents a study of a 1.6 metre square, helium-neon based ring laser gyroscope (denoted PR-1). This device is mounted on one of the internal walls of a high rise building. After optimisation a cavity Q of 2.9x10¹¹ and a sensitivity to rotation of approximately 10⁻³ of the background Earth bias was obtained. A detailed investigation of the single mode operating regime and multi-mode thresholds was undertaken and could be well accounted for with a simple model of the gain curves. A key feature of the operation of PR-1 is persistent longitudinal mode hopping. It is shown that by running the laser at selective high powers, one obtains CW mode locked operation thereby negating the influence of mode hopping and allowing for long time data acquisition. PR-1 was used to demonstrate oscillation of the Rutherford building on its second fundamental mode during an earthquake. In a separate investigation, a range of supermirrors were studied to determine the optimum configuration in a 4 by 4 metre ring laser. The set with the highest finesse prevailed despite the comparatively low light levels on the photo detectors. The geometric stability of the lasers was not found to be a significant factor.

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Rabeendran, Nishanthan. "New Approaches to Gyroscopic Lasers". Thesis, University of Canterbury. Physics and Astronomy, 2013. http://hdl.handle.net/10092/8609.

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This thesis presents a study of two aspects of ring laser gyroscopes: Correction of systematic errors due to optical backscatter, and development of solid-state ring laser gyroscopes. Backscatter at the optical surfaces of ring laser gyroscopes causes systematic measurement errors. These errors were modelled and corrected for in large ring lasers. The model included backscattering, hole burning and dispersion in the gain medium. The model predictions were used in conjunction with measurements of the intensity modulation of each beam and the phase difference between these modulation to correct the measured Sagnac frequency of the large ring lasers, PR-1 and G-0. Dramatic improvements in the sensitivity of both lasers were achieved. Most current laser gyroscopes use He-Ne plasma as the gain medium. This makes the devices fragile, the plasma creates UV light that degrades the cavity mirrors and the gas itself degrades over time. As a alternative, solid state materials might be used as the gain medium for the gyroscope. Both neodymium doped and erbium ytterbium co-doped phosphate glass lasers were constructed. Initially linear cavity designs were constructed to test the suitability of the gain media. Both laser systems employed longitudinal laser diode pumping. Thirty six perimeter ring lasers were then developed using both gain media. In both cases successful rotation sensing was achieved on a turntable which provided external rotation. For rotation rates between 0.1 and 0.85 rad/s, the gyroscope built using Er-Yb and Nd phosphate glass are superior to Nd:YAG (the only other material known to have been used in a continuous wave solid state gyroscope). This improvement is due to the use of thin heavily doped gain medium, which decreases the detrimental effect caused by gain gratings.

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Graham, Richard Douglas. "New Concepts for Operating Ring Laser Gyroscopes". Thesis, University of Canterbury. Physics and Astronomy, 2010. http://hdl.handle.net/10092/5058.

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A ring laser gyroscope (gyro) is an active laser interferometer designed to sense rotation through the Sagnac frequency shift encountered by two beams travelling in opposite directions around a closed path. The classes of devices considered in this thesis are the large and ultra-large ring laser gyros. These instruments are designed for direct measurement of earth rotation rate and find applications in geodesy, geophysics, and tests of physical theories. The research presented in this thesis focuses on the demonstration of new techniques for operating ring laser gyros. The main goal of these techniques has been the correction for variations in the geometry of an ultra-large ring laser gyro, UG-3. This instrument is a 77 m perimeter ultra-large ring laser gyro of heterolithic construction and is the primary instrument used in the experiments presented here. UG-3 has been used to demonstrate measurement of earth strains which have been used to correct for changes in the geometry of the instrument. It has also been used to demonstrate a control technique where the co-rotating beams were alternately offset allowing the number of wavelengths around the perimeter to be counted and a Sagnac rotation signal to be obtained. Among the most important outcomes of this research of interest to the large ring laser gyro community is that we now understand most of the problems that would affect a next generation ring laser gyro. This understanding allows us to choose an operational technique best suited to the measurements being made and thus maximise the scientific potential of the instrument. Additionally, the development of a new standard for data storage and an associated suite of software to acquire, query and analyse ring laser data is expected to improve collaboration with the wider research community. Other research outcomes of more general interest include the analysis of how oscillation of a single mode is established in a high finesse laser cavity. We demonstrate that the ultimate mode of operation can be selected with a ‘seed’ beam of exceptionally low intensity. An interesting related outcome is the demonstration of Sagnac beat frequency measurement during the ring down of a ring cavity, a type of measurement immune to dispersive and flow related frequency shifts.

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Tian, Wei. "Modeling and Data Analysis of Large Ring Laser Gyroscopes". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-130967.

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Ringlaser dienen dazu, durch genaue inertiale Messungen Rotationen ohne Bezug auf ein externes Referenzsystem lokal und praktisch in Echtzeit zu bestimmen. Sie wurden in den 1970er Jahren insbesondere für die Navigation von Flugzeugen entwickelt. In den letzten Jahrzehnten wurden Ringlaser dann so weit verbessert, dass sie nun auch als eigenständige Messinstrumente in der Geodäsie Verwendung finden. Aufgrund der erreichbaren Genauigkeit ist es inzwischen möglich, Variationen in der Erdrotation mit der dafür erforderlichen Präzision zu detektieren. Der stabilste unter den Ringlasern, der so genannte Ringlaser "G" der geodätischen Fundamentalstation Wettzell, erreicht eine Sensitivität von 1.2 x 10 -11 nrad. Damit ist dieses Instrument in der Lage, Neigungen von bis zu 1 nrad (dies entspricht einem Signal von 0.2 mas in der Polbewegung, in Änderung der Rotationsgeschwindigkeit der Erde) im täglichen und halb-täglichen Frequenzband zu messen. Motivation dieser Arbeit ist es, der in den letzten Jahren erreichten Verbesserung des Auflösungsvermögens und der Sensorstabilität Rechnung zu tragen und die für die Auswertung von Ringlaserdaten benutzten geophysikalischen Modelle weiter zu verbessern, um dadurch die variable Rotation der Erde noch präziser vermessen zu können. Die dafür relevanten Effekte werden in den einzelnen Kapiteln dieser Arbeit separat behandelt. Nach einer Einführung werden in Kapitel 2 dieser Arbeit drei lokale, topozentrische Koordinatensysteme konstruiert, mit welchen sich das zu beobachtende Sagnac-Signal eines Ringlasers in der ersten post-Newtonischen Näherung der Allgemeinen Relativitätstheorie adäquat beschrieben lässt. In Kapitel 3 wird ein verbessertes Modell für die Orientierung des Ringlasers, basierend auf Ergebnissen von Dehant et al. (1999), entwickelt. Ein in den bislang benutzten Modellen vernachlässigter Neigungsterm konnte dabei identifiziert werden. Ein Modell für die retrograde tägliche Polbewegung der Erde wird in Kapitel 4 entwickelt. Ausgehend von den dynamischen Gleichungen für eine starre Erde werden diese um elastische Effekte und Einflüsse der Mehrschichtigkeit der Erde ergänzt und die entsprechenden Euler-Liouvilleschen Gleichungen und Transfer-Funktionen abgeleitet. Gezeiteneinflüsse des Ozeans, speziell die dadurch hervorgerufene sub-tägliche Variation der Erdrotation und ozeanische Auflasteffekte, werden in Kapitel 5 behandelt. Es wird gezeigt, dass die ozeanischen Signale größer als 10 -9 Δf0 (Δf0 348 Hz für den Ringlaser "G") sind und damit in den Messdaten des Ringlasers "G" nachweisbar sein sollten. Auf Grundlage der in dieser Arbeit entwickelten Modelle wurde eine 168 Tage (30. April 17. Oktober 2010) umfassenden Datenreihe des Ringlasers "G" in Kapitel 6 ausgewertet. Für die Auswertung wurde die Software ETERNA 3.40 genutzt und entsprechend angepasst. Die tägliche retrograde Polbewegung konnte dabei mit einer Genauigkeit von 0.15 mas bestimmt werden. Diese Auswertung beweist ein weiteres Mal die Existenz eines flüssigen Erdkerns. Des weiteren konnte gezeigt werden, dass bestimmte Gezeitenparameter des halb-täglichen Frequenzbandes durch lokale Effekte beeinflusst werden. Lokal gemessene Luftdruckdaten wurden benutzt, um den Einfluss atmosphärischer Auflasteffekte auf den Ringlaser "G" zu untersuchen. Die Ergebnisse dieser Arbeit zeigen, dass sich für diese Effekte kein signifikanter Einfluss nachweisen lässt. Die Arbeit schließt mit einer Zusammenfassung der Resultate, einer Beschreibung der sich ergebenden Schlussfolgerungen und einem Ausblick auf zukünftige Arbeiten auf dem Gebiet der Ringlaseranalyse
Ring laser gyroscopes measure inertial rotations locally and in real-time without the need for an external reference system. Initially, they were developed for aircraft navigation applications in the 1970s. With the improvement of ring laser technology during the last decades large ring laser gyroscopes (RLGs) are nowadays used as independent geodetic instruments. Due to the achievable accuracy more and more geophysical signals become observable in the data. The G-ring located at the Geodetic Observatory Wettzell is reckoned as the most stable one amongst the running large RLGs and reaches a sensitivity of 1.2 x 10 -11 nrad. Therefore, the instrument is able to detect a tilt signal of 1 nrad (equivalent to a signal of 0.2 mas in polar motion or 10 -9 Ω0 in variation of Earth rotation rate) in the diurnal and semi-diurnal band. This motivates us to improve previous geophysical models and estimate associated tilt and Earth rotation signals, which are the focuses of this Thesis. Firstly, we construct three local proper topocentric reference frames and interpret the Sagnac effect observed by large RLGs in the first post-Newtonian (PN) approximation of Einstein's theory of gravity. Secondly, in Chapter 3 we develop an improved orientation model for the Sagnac platform, based on the numerical results of Dehant et al. (1999). A missing tilt term in previous RLG tilt models is found. In Chapter 4, based on the Euler-Liouville equations or nutation transfer functions for a rigid Earth, a purely elastic Earth, a two-layered Earth and a three-layered Earth, five retrograde diurnal polar motion models are computed with the HW95 tidal potential catalogue. Thirdly, ocean tide effects (two aspects: effects on sub-daily variations of Earth rotation and loading effect on tilt) are considered in Chapter 5. We show that the Sagnac signals induced by ocean tides are larger than 10 -9 Δf0 (Δf0 348 Hz for the G-ring) and their influences are visible in the G-ring. Fourthly, based on the above-mentioned improved models and 168 days (from Apr.30 to Oct.17 in 2010) of G-ring data, in the diurnal band, we estimate the retrograde diurnal polar motion signal with an accuracy of 0.15 mas. The Earth tide software ETERNA 3.40 was adopted and modified to analyse this data. Our estimation provides one more evidence for the existence of the Earth's fluid outer core. Furthermore, we found that the tidal parameters for the G-ring are affected by the cavity and topographic effects in the semi-diurnal band. The local air pressure record is used in order to investigate the atmospheric loading effect on the G-ring by a simple regression model. Nevertheless, the preliminary result shows that no significant influence from atmospheric loading on our estimation is found. This Thesis closes with a summary of the obtained results, conclusions and suggestions how the analysis of ring laser data could be improved in future work

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Badaoui, Noad. "Dynamique et estimation paramétrique pour les gyroscopes laser à milieu amplificateur gazeux". Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEM058/document.

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Les gyroscopes laser à gaz constituent une solution technique de haute performances dans les problématiques de navigation inertielle. Néanmoins, pour de très faibles vitesses de rotation, les petites imperfections des miroirs de la cavité optique font que les deux faisceaux contra-propageant sont verrouillés en phase. En conséquence, les mesures en quadrature de leur différence de phase ne permettent plus de remonter directement aux vitesses de rotation à l'intérieur d'une zone autour de zéro, dite zone aveugle statique, ou, si l'on utilise une procédure d'activation mécanique, dite zone aveugle dynamique. Ce travail montre qu'il est néanmoins possible, en utilisant des méthodes issues du filtrage et de l'estimation, de remonter aux vitesses de rotation mêmes si ces dernières sont en zone aveugle. Pour cela, on part d'une modélisation physique de la dynamique que l'on simplifie par des techniques de perturbations singulières pour en déduire une généralisation des équations de Lamb. Il s'agit de quatre équations différentielles non-linéaires qui décrivent la dynamique des intensités et des phases des deux faisceaux contra-propageant. Une étude qualitative par perturbations régulières, stabilité exponentielle des points d'équilibre et applications de Poincaré permet de caractériser les zones aveugles statiques et dynamiques en fonction des imperfections dues aux miroirs. Il est alors possible d'estimer en ligne avec un observateur asymptotique fondé sur les moindre carrés récursifs ces imperfections en rajoutant aux deux mesures en quadrature celles des deux intensités. La connaissance précise de ces imperfections permet alors de les compenser dans la dynamique de la phase relative, et ainsi d'estimer les rotations en zone aveugle. Des simulations numériques détaillées illustrent l'intérêt de ces observateurs pour augmenter la précision des gyroscopes à gaz
Gaz ring laser gyroscopes provide a high performance technical solution for inertial navigation. However, for very low rotational speeds, the mirrors imperfections of the optical cavity induce a locking phenomena between the phases of the two counter-propagating Laser beams. Hence, the measurements of the phase difference can no longer be used when the speed is within an area around zero, called lock-in zone, or,if a procedure of mechanical dithering is implemented, dithering lock-in zone. Nevertheless, this work shows that it is possible using filtering and estimation methods to measure the speed even within the lock-in zones. To achieve this result, we exploit a physical modeling of the dynamics that we simplify, using singular perturbation techniques, to obtain a generalization of Lamb's equations. There are four non-linear differential equations describing the dynamics of the intensities and phases of the two counter-propagating beams. A qualitative study by regular perturbation theory, exponential stability of the equilibrium points and Poincaré maps allows a characterisation of the lock-in zones according to the mirrors imperfections. It is then possible to estimate online, with an asymptotic observer based on recursive least squares, these imperfections by considering the additional measurements of the beam intensities. Accurate knowledge of these imperfections enables us to compensate them in the dynamic of the relative phase, and thus to estimate rotational speeds within the lock-in zones. Detailed numerical simulations illustrate the interest of those observers to increase the accuracy of gas ring laser gyroscopes

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Gaponov, Dmitry. "Propriétés optiques de fibres optiques microstructurées et laser à fibre de Bragg à grande aire modale". Limoges, 2008. http://aurore.unilim.fr/theses/nxfile/default/2af9d018-b039-4465-886e-0261ba1e73f3/blobholder:0/2008LIMO4067.pdf.

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De nos jours, nous observons une augmentation constante de la quantité de publications liées aux fibres microstructurées (MOFs). Bien que les aspects fondamentaux de leurs propriétés soient souvent éludés, leurs applications sont attrayantes pour de nombreux domaines de la science et la technologie en raison de leurs propriétés optiques uniques. Mon travail est consacré, d'une part à l'analyse comparative de certaines MOF bien connues à l'aide de différentes méthodes numériques et d'autre part, à la création expérimentale d'un laser à fibre monomode à grande aire modale (LMA) basé sur une fibre à bande photonique 1-D. Au cours de l'étude théorique, nous avons porté une attention particulière à l'étude de la structure de gaine. Nous avons en particulier montré le rôle de la réflexion radiale du champ sur l'interface silice polymère dans la hiérarchie des modes pour des fibres à cœur creux ou plein. Dans la partie expérimentale, nous avons étudié des fibres de Bragg dopées à l'ytterbium. Nous avons obtenu, pour la première fois, l'émission d'un faisceau monomode et démontré l'excellente résistance aux pertes par courbure de ce type de fibre en régime d'oscillation laser
Nowadays we observe a constant increasing of the amount of publications connected with Micro-structured Optical Fibers (MOFs). Nevertheless the unclear physical questions are still remaining in this field. From the other hand, applying of such structures is attractive in different fields of science and technology due to their unique optical properties. Our work is devoted to the theoretical analysis of some of the basic MOF types and to the experimental creation of fiber laser based on large mode area (LMA) 1-D photonic bandgap fiber (i. E. Bragg Fiber, BF). In the experimental part we investigated the Yb-doped LMA BF. We created a fiber laser based on this fiber with pumping into the cladding. We obtained the efficient singlemode lasing with low bend sensitivity, to the best of our knowledge, for the first time in such type of fibers

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Mallek-Bouras, Djouher. "Etude de l'effet Brillouin en cavité laser". Angers, 2011. http://www.theses.fr/2011ANGE0008.

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Cette étude va servir à comprendre la source des instabilités observées expérimentalement dans les lasers à fibre de puissance. La première partie de ce travail est consacrée a la mise en oeuvre d'un modèle cinétique qui décrit l'évolution spatio-temporelle de l'intensité d'un laser de puissance à fibre dopée ytterbium en présence de la DBS. La cavité de ce laser est de type Fabry Pérot. Elle est constituée de deux miroirs ce qui conduit à l'existence de deux ondes laser (aller-retour) qui se propagent en sens contraire, ainsi que de deux ondes Stokes associées aux ondes laser. La présence de toutes ces ondes sous la courbe de gain nécessite la prise en compte de la saturation croisée entre les ondes laser et les ondes Stokes. Le résultat original le plus important de cette étude est qu'en présence de la diffusion Brillouin stimulée, le laser à fibre de puissance dopée ytterbium présente un fonctionnement auto-impulsionnel dans le cas d'une cavité à forte pertes sans aucun absorbant saturable. Pour le cas d'une bonne cavité où cavité à faibles pertes la dynamique présente un fonctionnement continu quel que soit le taux de pompage, ce qui est conforme aux observations expérimentales. Dans Ia deuxième partie nous avons étudié numériquement l'influence de la diffusion BriIlouin dans une cavité laser à faibles pertes, en utilisant le modèle des amplitudes couplées et en tenant compte de la dynamique de l'onde acoustique. Des fonctionnements dynamiques riches et complexes sont observés
This study serves to understand the origin of the instabilities observed experimentally in the high power double cladding fiber lasers. The irnplementation of a kinetic model which describes the spatiotemporal evolution of the intensity of a high power fiber laser in the presence of the scattering Brillouin was studied in the first part. The Fabry-Perot laser cavity was considered. It is established by two rnirrors what drives to the existence of two laser waves which propagate in opposite sense, as well as of two Stokes waves associated with the waves lasers. The presence of al1 these waves under the curve of gain requires the consideration of the saturation crossed between the waves laser and the waves Stokes. The most important original result of this study is that in the presence of the stimulated scattering Brillouin, the ytterbium doped fiber laser presents an auto-impulsive functioning in the case of a cavity to strong losses without any absorbent saturable. For the case of cavity with low losses the dynamics presents a continuous functioning whatever the rate of pumping. The f i e n c e of the stimulated scattering Brillouin in a laser cavity with low losses was studied numerically in the second part, by using the model of the coupled amplitudes and by taking into account the dynamics of the acoustic wave. Rich and complex dynamic are observed

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Mignot, Augustin. "Gyrolaser semi-conducteur à cavité externe". Phd thesis, Ecole Polytechnique X, 2008. http://pastel.archives-ouvertes.fr/pastel-00004908.

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Une des techniques connues pour la gyrométrie est d'utiliser l'effet Sagnac dans une cavité laser en anneau avec pour milieu à gain un mélange d'Hélium et de Néon. Si ses qualités gyrométriques sont clairement établies, ce type de laser trouve ses principales limitations industrielles dans le caractère gazeux de son milieu à gain. Des solutions fondées sur un cristal de Nd :Yag ont déjà pu montrer qu'il était possible d'obtenir un signal Sagnac dans un autre type de milieu à gain. Il est cependant apparu que le temps relativement long de la fluorescence (230 μs) était une des sources de limitation de la qualité de la réponse en fréquence. Le semi-conducteur, par son temps de vie de luminescence beaucoup plus court (3 ns) présente ainsi un avantage potentiel pour la gyrométrie. De plus, la possibilité d'un pompage électrique pourrait offrir à terme une réduction importante des coûts. L'objectif de ce travail de thèse est ainsi d'étudier la possibilité de réaliser un gyrolaser fondé sur un milieu à gain semi conducteur dans une cavité en espace libre. La dynamique du milieu à gain étant significativement différente des systèmes précédemment cités, il est d'abord nécessaire d'étudier les conditions de stabilité du fonctionnement gyrométrique, ainsi que les performances que l'on peut espérer obtenir avec un tel système. L'influence du couplage phase-amplitude propre aux milieux semi-conducteurs est en particulier mise en évidence. Dans un deuxième temps, nous montrons experimentalement qu'il est effectivement possible d'obtenir à partir d'une cavité en anneau avec un 1/2-VCSEL un fonctionnement gyrométrique, grâce une géométrie de cavité adéquate et à un asservissement des intensités permettant de contrebalancer les effets de la compétition de modes qui a lieu au sein du semi-conducteur.

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Tian, Wei [Verfasser], Michael H. [Akademischer Betreuer] Soffel, Aleksander [Akademischer Betreuer] Brzeziński i Harald [Akademischer Betreuer] Schuh. "Modeling and Data Analysis of Large Ring Laser Gyroscopes / Wei Tian. Gutachter: Michael H. Soffel ; Aleksander Brzezinski ; Harald Schuh. Betreuer: Michael H. Soffel". Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://d-nb.info/1068444673/34.

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Altorio, Matteo. "Novel atom interferometry techniques for a cold-atom gyroscope of large Sagnac area Atom interferometry with top-hat laser beams Improving the phase response of an atom interferometer by means of temporal pulse shaping". Thesis, Sorbonne université, 2019. http://www.theses.fr/2019SORUS449.

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Cette thèse décrit la mise en œuvre de nouvelles techniques d'interférométrie atomique améliorant la stabilité et l’exactitude d'un gyromètre à atomes froids situé au laboratoire SYRTE. Des transitions Raman stimulées permettent de séparer et recombiner les ondes atomiques. Une séquence de quatre impulsions lumineuses génère un interféromètre avec une aire Sagnac de 11 cm2. Je présente la mise en œuvre d'un schéma d'interrogation entrelacé dans un interféromètre dont le temps d'interrogation est de 801 ms, dans lequel trois nuages atomiques sont interrogés simultanément résultant en une cadence de mesure de 3,75 Hz. Avec ce schéma, nous démontrons une sensibilité de 30 nrad/s/sqrt(Hz). Nous présentons ensuite des mesures de rotation dynamiques dans une plage jusqu'ici inexplorée pour un capteur à atomes froids. Un biais important du capteur provient d'un couplage entre un désalignement relatif des miroirs rétroréfléchissant les faisceaux Raman et la trajectoire de l'atome. Une technique est introduite pour réduire ce biais au niveau de 3 nrad/s et atteindre une stabilité à long terme de 0,3 nrad/s qui représente l'état de l'art des gyromètres atomiques. Le manuscrit décrit ensuite la première caractérisation du facteur d'échelle du gyromètre à l'aide de différentes techniques. En particulier, la mise en place d’une plateforme de rotation sous le capteur permet de faire varier la projection du vecteur rotation de la Terre sur l'interféromètre et donc de moduler le déphasage de rotation. Les techniques présentées dans cette thèse ouvrent la voie à un test de l'effet Sagnac pour les ondes de matière avec une précision relative inférieure à 100 parties par million
This thesis describes the implementation of new atom interferometry techniques to improve the stability and accuracy of a cold-atom gyroscope located at the SYRTE laboratory. Stimulated Raman transitions are used to split and recombine the atomic waves. A sequence of four light pulses generates an interferometer with a Sagnac area of 11 cm2. I present the implementation of an interleaved interrogation scheme, where three atomic clouds are interrogated simultaneously in an atom interferometer featuring a sampling rate of 3.75 Hz and an interrogation time of 801 ms. With this scheme we demonstrate a short-term sensitivity of 30 nrad·s-1·Hz-1/2. We then present measurements of dynamic rotation rates in a so far unexplored range for a cold atom sensor. An important bias of the sensor originates from a coupling between a relative misalignment of the mirrors which retro-reflect the Raman beams and the trajectory of the atom. A technique is introduced to reduce this bias at the level of 3 nrad·s-1 and to achieve a long-term stability of 0.3 nrad·s-1 which represents the state of the art for atomic gyroscopes. The manuscript then describes the first characterization of the scale factor of the gyroscope using different techniques. In particular, the implementation of a rotation stage below the sensor enables us to vary the projection of the Erath rotation rate vector onto the interferometer area and therefore to modulate the rotation phase shift. The implementation of the techniques presented in this thesis pave paving the way to a test of the Sagnac effect for matter waves with a relative accuracy level below 100 parts per million

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Książki na temat "Laser gyroscopes"

Roden, Sven Glyn. Lock-in mechanisms in ring laser gyroscopes. Manchester: University of Manchester, 1993.

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Bowen, M. F. Ultimate ocean depth packaging for a digital ring laser gyroscope. Woods Hole, Mass: Woods Hole Oceanographic Institution, 1998.

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Seregin, V. V. Lazernye girometry i ikh primenenie. Moskva: "Mashinostroenie", 1990.

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Naftaly, Mira. Mode locking in the ring laser gyroscope: Reduced threshold for two cavity modes. Uxbridge: Brunel University, 1990.

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IEEE Aerospace and Electronic Systems Society. Gyro and Accelerometer Panel., Institute of Electrical and Electronics Engineers. i IEEE Standards Board, red. IEEE standard specification format guide and test procedure for single-axis laser gyros. New York, N.Y., USA: Institute of Electrical and Electronics Engineers, 1996.

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Institute Of Electrical and Electronics Engineers. IEEE Standard Specification Format Guide and Test Procedure for Single-Axis Laser Gyros. Institute of Electrical & Electronics Enginee, 1997.

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P, De Paula Ramon, Udd Eric, University of Alabama in Huntsville. Center for Applied Optics. i Society of Photo-optical Instrumentation Engineers., red. Fiber optic and laser sensors IV: 22-24 September 1986, Cambridge, Massachusetts. Bellingham, Wash., USA: SPIE--the International Society for Optical Engineering, 1987.

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Eric, Udd, De Paula Ramon P i Society of Photo-optical Instrumentation Engineers., red. Fiber optic and laser sensors IX: 3-5 September 1991, Boston, MA. Bellingham, Wash., USA: SPIE--the International Society for Optical Engineering, 1991.

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Eric, Udd, De Paula Ramon P i Society of Photo-optical Instrumentation Engineers., red. Fiber optic and laser sensors X: 8-11 September 1992, Boston, Massachusetts. Bellingham, Wash., USA: SPIE--the International Society for Optical Engineering, 1993.

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Części książek na temat "Laser gyroscopes"

Chopra, Kamal Nain. "Ring Laser Gyroscopes". W Optoelectronic Gyroscopes, 1–30. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8380-3_1.

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Chopra, Kamal Nain. "Improvement in the Laser-Induced Damage Threshold by the Dual Ion Beam Sputtering Technology". W Optoelectronic Gyroscopes, 69–79. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8380-3_4.

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Armenise, M. N. "He–Ne and Solid-State Ring Laser Gyroscopes". W Advances in Gyroscope Technologies, 17–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-15494-2_3.

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Zharov, V. E., S. N. Markova i V. A. Krainov. "The Construction of Laser Gyroscope". W Optical Resonators — Science and Engineering, 463–75. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-017-2486-9_31.

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Eckerle, M., Peter Krippner, M. Bouamra, A. Chakari i P. Meyrueis. "Multimode Fibre Optic Gyroscope, Recent Progress and Limits". W Laser in Forschung und Technik / Laser in Research and Engineering, 676–79. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-80263-8_140.

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Scheufler, Peter, Klaus-Dieter Dünnebeil, Thomas Vetter i Michael Mehring. "Highly Stabilized Infrared Diode-Laser for Optical Pumping of Rb-Xe-NMR Gyroscope". W High Precision Navigation, 602–10. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-74585-0_43.

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Shravankumar, C., K. Jegadeesan i T. V. V. L. N. Rao. "Analysis of Rotor Supported in Double-Layer Porous Journal Bearing with Gyroscopic Effects". W Lecture Notes in Mechanical Engineering, 65–75. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5701-9_6.

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Schleich, W., P. Dobiasch, V. E. Sanders i M. O. Scully. "Nonequilibrium Statistical Physics in a Dithered Ring Laser Gyroscope or Quantum Noise in Pure and Applied Physics". W NATO ASI Series, 385–408. Boston, MA: Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2181-1_27.

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"Gyroscopes: Ring Laser". W Encyclopedia of Optical and Photonic Engineering, Second Edition, 1–11. CRC Press, 2015. http://dx.doi.org/10.1081/e-eoe2-120047139.

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Digonnet, M. J., i J. N. Chamoun. "Recent Developments in Laser-Driven and Hollow-Core Fiber Optic Gyroscopes". W Design and Development of Fiber Optic Gyroscopes. SPIE, 2019. http://dx.doi.org/10.1117/3.2522293.ch9.

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Streszczenia konferencji na temat "Laser gyroscopes"

Scaramuzza, Nicholas, i Jay D. Tasson. "Laser Gyroscopes, Gravity, and the SME". W Seventh Meeting on CPT and Lorentz Symmetry. WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813148505_0072.

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Belfi, J., F. Bosi, A. Di Virgilio, R. Santagata, A. Ortolan, N. Beverini, G. Carelli, E. Maccioni i D. Cuccato. "Experimental activity toward GINGER (gyroscopes IN general relativity)". W 2014 International Conference Laser Optics. IEEE, 2014. http://dx.doi.org/10.1109/lo.2014.6886318.

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Mikroulis, S., H. Simos, D. Syvridis, M. Hamacher, U. Tropenz i H. Heidrich. "Dynamic properties of integrated ring laser gyroscopes". W 2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference. IEEE, 2007. http://dx.doi.org/10.1109/cleoe-iqec.2007.4386378.

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Belfi, Jacopo, Nicolo Beverini, Bachir Bouhadef, Giorgio Carelli, Davide Cuccato, Angela Di Virgilio, Andrea Licciardi i in. "Laser gyroscopes for very high sensitive applications". W 2012 European Frequency and Time Forum (EFTF). IEEE, 2012. http://dx.doi.org/10.1109/eftf.2012.6502422.

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Harayama, Takahisa, Satoshi Sunada, Shuichi Tamura, Keizo Inagaki i Hiroyuki Noto. "Nonlinear Sagnac effect for ring laser gyroscopes". W Optical Fiber Sensors. Washington, D.C.: OSA, 2006. http://dx.doi.org/10.1364/ofs.2006.tue63.

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Cole, Garrett D., David Follman, Markus Aspelmeyer, K. Ulrich Schreiber, Robert J. Thirkettle, Robert B. Hurst i Jon-Paul R. Wells. "Crystalline coatings for near-IR ring laser gyroscopes". W 2015 IEEE Avionics and Vehicle Fiber-Optics and Photonics Conference (AVFOP). IEEE, 2015. http://dx.doi.org/10.1109/avfop.2015.7356623.

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Stefani, F., N. Beverini, G. Carelli, D. Ciampini, A. Di Virgilio, F. Fuso, U. Giacomelli i E. Maccioni. "Long term stabilization of large frame laser gyroscopes". W 2018 European Frequency and Time Forum (EFTF). IEEE, 2018. http://dx.doi.org/10.1109/eftf.2018.8409012.

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Sin-Woo Song, Mun-Soo Park, Duck-Gee Park, Suk-Kyo Hong, Dong-Hun Kim i Jea-Cheul Lee. "Dithering system model identification of ring laser gyroscopes". W 2007 International Conference on Control, Automation and Systems. IEEE, 2007. http://dx.doi.org/10.1109/iccas.2007.4406601.

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Cuccato, Davide, Jacopo Belfi, Nicolo Beverini, Massimo Calamai, Angela Di Virgilio i Antonello Ortolan. "Laser dynamics effects on the systematics of large size laser gyroscopes". W 2013 Joint European Frequency and Time Forum & International Frequency Control Symposium (EFTF/IFC). IEEE, 2013. http://dx.doi.org/10.1109/eftf-ifc.2013.6702127.

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Hurst, Robert B., Nishanthan Rabeendran, Jon-Paul R. Wells i K. Ulrich Schreiber. "Large ring laser gyroscopes: towards absolute rotation rate sensing". W International Seminar on Photonics, Optics, and Applications 2014, redaktor Aulia Nasution. SPIE, 2015. http://dx.doi.org/10.1117/12.2084349.

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