Bibliografie tematiche / Frequency shifted feedback

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Letteratura scientifica selezionata sul tema "Frequency shifted feedback"

Autore: Grafiati

Pubblicato: 10 dicembre 2022

Ultima modifica: 28 gennaio 2023

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Articoli di riviste sul tema "Frequency shifted feedback"

Yoshida, Masato, Koichiro NAKAMURA e Hiromasa ITO. "Frequency-Shifted Feedback Fiber Laser." Review of Laser Engineering 27, n. 7 (1999): 490–94. http://dx.doi.org/10.2184/lsj.27.490.

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Balle, Stefan. "Lasers with internal frequency-shifted feedback". Optical Engineering 33, n. 4 (1 aprile 1994): 1146. http://dx.doi.org/10.1117/12.163197.

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Balle, Stefan, Ian C. M. Littler, Klaas Bergmann e Frank V. Kowalski. "Frequency shifted feedback dye laser operating at a small shift frequency". Optics Communications 102, n. 1-2 (settembre 1993): 166–74. http://dx.doi.org/10.1016/0030-4018(93)90487-p.

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Paul, J., P. S. Spencer, K. A. Shore, I. Pierce e Y. Hong. "Optical frequency-domain ranging using a frequency-shifted feedback distributed-feedback laser". IET Optoelectronics 1, n. 6 (1 dicembre 2007): 277–79. http://dx.doi.org/10.1049/iet-opt:20070034.

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Saarinen, Esa J., Jari Nikkinen e Oleg G. Okhotnikov. "Semiconductor Disk Laser With Frequency-Shifted Feedback". IEEE Photonics Technology Letters 23, n. 9 (maggio 2011): 567–69. http://dx.doi.org/10.1109/lpt.2011.2116779.

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Guillet de Chatellus, H., e J. P. Pique. "Statistical properties of frequency shifted feedback lasers". Optics Communications 283, n. 1 (gennaio 2010): 71–77. http://dx.doi.org/10.1016/j.optcom.2009.09.027.

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Yatsenko, L. P., B. W. Shore e K. Bergmann. "Theory of a frequency-shifted feedback laser". Optics Communications 236, n. 1-3 (giugno 2004): 183–202. http://dx.doi.org/10.1016/j.optcom.2004.03.049.

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de Chatellus, Hugues Guillet, Eric Lacot, Olivier Jacquin, Wilfried Glastre e Olivier Hugon. "Heterodyne beatings between frequency-shifted feedback lasers". Optics Letters 37, n. 5 (21 febbraio 2012): 791. http://dx.doi.org/10.1364/ol.37.000791.

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Natke, Ulrich, e Karl Theodor Kalveram. "Effects of Frequency-Shifted Auditory Feedback on Fundamental Frequency of Long Stressed and Unstressed Syllables". Journal of Speech, Language, and Hearing Research 44, n. 3 (giugno 2001): 577–84. http://dx.doi.org/10.1044/1092-4388(2001/045).

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Twenty-four normally speaking subjects had to utter the test word /tatatas/with different stress patterns repeatedly. Auditory feedback was provided by headphones and was shifted downwards in frequency during randomly selected trials while the subjects were speaking the complete test word. If the first syllable was long stressed, fundamental frequency of the vowel significantly increased by 2 Hz (corresponding to 25.5 cents) under frequency-shifted auditory feedback of .5 octave downwards, whereas under a shift of one semitone downwards a trend of an increase could be observed. If the first syllable was unstressed, fundamental frequency remained unaffected. Regarding the second syllable, significant increases or a trend for an increase of fundamental frequency was found in both shifting conditions. Results indicate a negative feedback mechanism that controls the fundamental frequency via auditory feedback in speech production. However, within a syllable a response could be found only if the syllable duration was long enough. Compensation for frequency-shifted auditory feedback still is quite imperfect. It is concluded that control of fundamental frequency is rather important on a suprasegmental level.

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Nakamura, K., T. Hara, M. Yoshida, T. Miyahara e H. Ito. "Optical frequency domain ranging by a frequency-shifted feedback laser". IEEE Journal of Quantum Electronics 36, n. 3 (marzo 2000): 305–16. http://dx.doi.org/10.1109/3.825877.

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Più fonti

Tesi sul tema "Frequency shifted feedback"

Thorette, Aurélien. "Synchronization dynamics of dual-mode solid-state and semiconductor DFB lasers under frequency-shifted feedback : applications to microwave photonics". Thesis, Rennes 1, 2018. http://www.theses.fr/2018REN1S059/document.

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Le contrôle de la différence de fréquence entre deux lasers est un défi transversal à de nombreux domaines de la photonique, que ce soit dans un but de génération hétérodyne d'un battement micro-onde de grande pureté, ou pour des expériences de métrologie ou de télécommunication. L'avancée des connaissances sur la dynamique de lasers soumis à divers couplages a permis le développement de méthodes de stabilisation basées sur l'injection optique. Nous étudions ici théoriquement et expérimentalement un mécanisme appelé réinjection décalée en fréquence (RDF), qui permet dans des situations variées de contrôler précisément la différence de fréquence entre deux lasers. Dans un premier temps, la méthode RDF est appliquée à un laser à état solide bi-polarisation bi-fréquence Nd:YAG afin de verrouiller en phase ses deux modes de polarisation orthogonaux. Le développement d'un modèle type «rate equations» en bonne adéquation avec les expériences a aussi permis de mettre en lumière un certain nombre de régimes de synchronisation partielle dits de phase bornée. De plus, nous montrons que cet état peut subsister en présence d'oscillations chaotiques de l'intensité et de la phase. Le comportement du laser sous RDF est étudié pour différentes valeurs du désaccord de fréquence, du taux d'injection, du retard éventuel, et du couplage inter-modes. Enfin, la nécessité d'inclure un couplage phase-amplitude (facteur de Henry non-nul) dans le modèle a mené au développement d'une méthode pour mesurer ce coefficient habituellement négligé dans les lasers solides. Le mécanisme de stabilisation par RDF est ensuite appliqué à un composant semiconducteur original contenant deux lasers DFB sur InP. Malgré une plus grand complexité du schéma de couplage, et la présence de retards effectifs importants, il reste possible de synchroniser en phase ces lasers. Des bandes d'accrochages liées au retard sont observées, et reproduites à l'aide d'un modèle numérique. Ce dernier permet aussi de déterminer les conditions de fonctionnement minimisant l'influence de paramètres expérimentaux non maîtrisés. Enfin, ce système, permettant de contrôler une phase micro-onde sur porteuse optique, peut être intégré dans une boucle résonante de type oscillateur opto-électronique (OEO) qui ne nécessite pas de référence externe. On réalise un oscillateur micro-onde sur porteuse optique auto-référencé, à bande latérale unique, ayant des performances encourageantes. Dans ce cadre, il semble que la plupart des techniques développées pour les OEO puissent être réinvesties
The control of the frequency difference between two lasers is a cross-cutting challenge in many fields of photonics, either for the generation of high-purity heterodyne microwave beatnotes, or in metrology and telecommunication experiments. The advances of the comprehension of laser dynamics under various couplings has allowed to develop stabilization methods based on optical injection. We study here theoretically and experimentally a mechanism called frequency-shifted feedback (FSF), which allows to precisely control the frequency difference between two lasers in several situations.First, the FSF method is applied to a dual-frequency dual-polarization solid-state Nd:YAG laser, in order to lock the phases of its two orthogonal polarization modes. A model of rate equations is used to precisely describe the experiment, and allows to highlight partial "bounded phase" synchronization regimes. Furthermore, we show that in some cases this synchronization can subsist even with chaotic oscillations of the intensity and phase. The behavior of the laser under FSF is studied for varying values of the frequency detuning, injection rate, possible injection delay, and mode coupling in the active medium. Finally, we find that the inclusion of a phase-amplitude coupling (non-zero linewidth enhancement factor) is needed in the model to account for experimental observation. This leads to the development of an ad-hoc technique to measure the low value of this usually neglected factor in solid-laser lasers.The FSF stabilization mechanism is then applied to a custom semiconductor component embedding two DFB lasers overs InP. In spite of a more complex coupling scheme and the large effective delays into play, phase locking of the two lasers is possible. Due to the delay, locking bands appear when the detuning changes, and this behavior can be replicated using a numerical model. This model also permit to determine working conditions minimizing the influence of uncontrolled experimental optical feedback phases. Finally, as this system allows to control a microwave phase over an optical carrier, it can be integrated in a resonant loop not unlike an opto-electronic oscillator (OEO). We realized an oscillator generating a self-referenced, single sideband microwave signal over an optical carrier, with encouraging phase noise performances. In this case, it seems that most of the techniques that exist for standard OEO can be reused

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Klubus, Jan. "Elektronické filtrační obvody s obecnými kmitočtovými charakteristikami". Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413252.

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Master’s thesis deals with the issue of electronic filtering circuits with arbitrary frequency characteristics. First part of the thesis describes theoretical basis. Second part explores the possibilities of design procedures for filters with arbitrary frequency characteristics. Design procedures are demonstrated on examples accordingly to the presented methods, including their circuit implementation and computer simulation to verify the correctness of theoretical assumptions. Thesis also explores the possibilities of tuning circuit structures and electronic setting for characteristics using controllable active elements.

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Wu, Yu-Chen, e 吳育政. "The study of 1.5 μm frequency-shifted-feedback fiber laser". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/37649544225143715335.

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碩士
逢甲大學
光電研究所
99
In this paper, a frequency shifter was used inside a fiber laser to build up a 1.5-μm frequency-shifted feedback (FSF) fiber laser. The frequency shifter used in this experiment was an acousto-optic modulator (AOM) driven at 110 MHz. Since the AOM was used in a double-pass configuration, our FSF fiber laser can generate frequency comb with an equi-frequency interval of 220 MHz. We observed that when the Second harmonic of the AOM driven frequency was resonant with laser cavity, we can inhibit the relaxation oscillation of our fiber laser. Center frequency of the frequency comb from our FSF laser could be controlled by seeding an external cavity tunable diode laser (ECDL) into the cavity of the FSF laser. This frequency comb was center at 1.53- μm with an optical bandwidth about 5 nm, and total output power is 2 mW.

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Bawden, Nathaniel. "Pulsed Fibre Lasers Beyond 3 Micron". Thesis, 2021. https://hdl.handle.net/2440/134209.

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The mid-infrared spectral region between 3 μm and 5 μm contains the absorption features of many different organic and biological compounds, which leads to a wide range of potential applications for sources of mid-infrared radiation. Historically, this part of the spectrum has been difficult to access, which has limited the development of these applications. Fibre based lasers offer long gain lengths, effective thermal management and robustness. This thesis explores pulsed operation of fibre lasers using the ⁴F(9/2) → ⁴I(9/2) transition in erbium, which is currently the only fibre laser source to directly generate light in the 3.4 μm to 3.8 μm region. This thesis explores lasers that generate pulses in the nanonsecond, picosecond and femtosecond regimes through use of both Q-switching and mode-locking techniques. The Q-switched systems utilise acousto-optic devices to modulate the resonator losses and produce pulsed laser output. These systems included the first actively Q-switched fibre laser at 3.5 μm. Mode-locked pulses with electronically tunable wavelength were generated via the frequency shifted feedback technique, using an acousto-optic tunable filter. The non-linear polarisation rotation method was used to generate ultrafast mode-locked pulses. This was the first time that this technique had been used on the 3.5 μm erbium transition, which resulted in the first subpicosecond pulses from a fibre laser at this wavelength, with a duration of 580 fs and an energy of 3.2 nJ. The resulting peak power of 5.5kW is the highest of any 3.5 μm fibre laser system. The ultrashort pulses are used to demonstrate non-linear spectral broadening in a highly non-linear fibre. This thesis concludes with a summary of results and suggestions for future work.
Thesis (Ph.D.) -- University of Adelaide, School of Physical Sciences, 2021

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Capitoli di libri sul tema "Frequency shifted feedback"

Kim, J. I., V. V. Ogurtsov, G. Bonnet, L. P. Yatsenko e K. Bergmann. "Ranging with Frequency-Shifted Feedback Lasers: From μm-Range Accuracy to MHz-Range Measurement Rate". In Exploring the World with the Laser, 701–27. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-64346-5_38.

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Wang, Meng, Mengda Li e Xinghao Wang. "Simulation Study of the Improved Positive Feedback Active Frequency Shift Island Detection Method". In Advances in Intelligent Systems and Computing, 596–603. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-34387-3_73.

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Umemoto, S., M. Fujii, N. Miyamoto, T. Okamoto, T. Hara, H. Ito e Y. Fujino. "Deflection measurement for bridges with frequency-shifted feedback laser". In Bridge Maintenance, Safety, Management and Life-Cycle Optimization, 502. CRC Press, 2010. http://dx.doi.org/10.1201/b10430-389.

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Kubota, K., Y. Fujino, N. Miyamoto, T. Hara, H. Ito, S. Umemoto e T. Okamoto. "The application of the frequency-shifted feedback laser optical coordinates measurement system for field measurement of bridges in service". In Bridge Maintenance, Safety Management, Health Monitoring and Informatics - IABMAS '08. Taylor & Francis, 2008. http://dx.doi.org/10.1201/9781439828434.ch187.

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Murphy, Kevin R. "The Past, Present, and Future of Performance Management". In Performance Management Transformation, 318–42. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190942878.003.0016.

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Performance management developed out of, and in part in reaction to, traditional performance appraisal systems. Despite frequent claims in the business press that performance appraisal is dying, fairly traditional appraisal systems are still common in work organizations. However, there is evidence of an ongoing shift toward performance management systems that differ from traditional performance appraisal systems in several important ways. The types of performance management systems exemplified in the case studies included in this volume place more emphasis on frequent, informal evaluation; real-time feedback; and alignment with organizational strategies and goals than is common in traditional appraisal systems. These types of performance management systems have a lot to offer, and the case studies illustrate the potential advantage of modern approaches to performance management. Unfortunately, these case studies also exemplify a deeply worrying trend in performance management: a frequent failure to even ask whether (much less to demonstrate that) performance management has any real effect on performance or effectiveness. Some recommendations are made regarding research strategies for evaluating performance management; several of the most pressing challenges in this endeavor are identified, notably the problematic status of feedback and the trade-offs involved when moving from formal appraisal systems to systems built around informal feedback.

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Wilkens, Christian P. "Remote University Supervision of Student Teachers". In Preparing Faculty for Technology Dependency in the Post-COVID-19 Era, 16–37. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-7998-9235-9.ch002.

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This chapter outlines the shift of a U.S.-based university teacher preparation program from in-person supervision of student teachers to fully remote supervision during the global COVID-19 pandemic. Strengths identified in the shift to remote supervision include elimination of travel to school sites, modest cost savings, improved frequency and scope of feedback provided by university supervisors, increased flexibility in timing and nature of observations, and the use of recorded videos for reflection. Challenges identified include the need for ongoing professional development among all parties, missing school and classroom context, and weaker relationships between university supervisors and K-12 mentor teachers. The chapter makes recommendations for university teacher education programs considering a shift to remote supervision of student teachers, including provision of professional development, implementation of video coaching cycles, and explicit planning for relationship development with K-12 school partners.

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Zhikhareva-Tolstik, Hanna, e Victoria Datsenko. "EXPERIENCE OF FUNCTIONAL RECONSTRUCTION OF SHOPPING CENTERS OF FRANCE, JAPAN, USA, CHINA, GERMANY AND UKRAINE IN THE ERA OF DIGITAL TECHNOLOGIES". In Integration of traditional and innovation processes of development of modern science. Publishing House “Baltija Publishing”, 2020. http://dx.doi.org/10.30525/978-9934-26-021-6-17.

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Shopping center operators still have ample opportunities to innovate, transform functionally, benefit and remain relevant to 21st century buyers. This is especially true for emerging markets, where income growth, increased discretionary spending, and urbanization have created opportunities for social and commercial "directions." To improve the experience of both buyers and tenants, operators must constantly offer a variety of new, fast-delivery services and technology-based products. This will require the use of flexible approaches to testing new products, events and services, and then rapid adaptation based on feedback. Shopping center operators will also need to extend this more flexible operating model to their tenants, facilitating close coordination. For all this, operators need people who understand flexible design, process redesign, as well as IT architecture and infrastructure. Achieving this new way of working and maintaining customer focus requires cultural shift operators from shopping center operators. Operators who have long been accustomed to long development cycles and low risk tolerance will need to adopt a mindset based on testing and training in which all employees become accustomed to feeling constantly failing and accepting failures as a necessary harbinger of success. This study examines a number of areas in which retailers should focus their efforts. Namely, rethinking leases, creating new revenue streams and additional services, using technology to increase the value of shopping centers and demand for modern opportunities. In addition, this study conducted a survey of visitors to shopping and entertainment centers and determined the average frequency of visits. As an example, the authors of the study propose to consider the seven most creative models of functional restructuring and reconception of shopping and entertainment centers in France, Japan, USA, China, Germany and Ukraine.

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Atti di convegni sul tema "Frequency shifted feedback"

Kowalski, Frank V., Stefan Balle, Ian C. M. Littler e Klaas Bergmann. "Lasers with internal frequency-shifted feedback". In OE/LASE'93: Optics, Electro-Optics, & Laser Applications in Science& Engineering, a cura di Roger L. Facklam, Karl H. Guenther e Stephan P. Velsko. SPIE, 1993. http://dx.doi.org/10.1117/12.148375.

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Phillips, M. W., G. Y. Liang e J. R. M. Barr. "Nd:YLF Laser with Frequency-Shifted Feedback". In Advanced Solid State Lasers. Washington, D.C.: OSA, 1993. http://dx.doi.org/10.1364/assl.1993.nl3.

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Ndiaye, C., T. Hara e H. Ito. "Profilometry using a frequency-shifted feedback laser". In 2005 Conference on Lasers and Electro-Optics (CLEO). IEEE, 2005. http://dx.doi.org/10.1109/cleo.2005.202265.

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Cheikh Ndiaye, Takefumi Hara, Frank V. Kowalski e Hiromasa Ito. "Frequency-shifted feedback laser with an SOA". In 2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference. IEEE, 2006. http://dx.doi.org/10.1109/cleo.2006.4627705.

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Orozco, Thamar A., e Juan Hernández-Cordero. "Polarization switched frequency shifted feedback fiber laser". In Workshop on Specialty Optical Fibers and Their Applications (WSOF-10), a cura di Juan Hernández-Cordero, Ismael Torres-Gómez e Alexis Méndez. SPIE, 2010. http://dx.doi.org/10.1117/12.868436.

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Yatsenko, Leonid P. "Frequency shifted feedback lasers. Theory, experiment, applications". In 2008 International Conference on Advanced Optoelectronics and Lasers (CAOL). IEEE, 2008. http://dx.doi.org/10.1109/caol.2008.4671993.

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Yatsenko, L. P., V. M. Khodakovsky, V. V. Ogurtsov, G. Bonnet, B. W. Shore e K. Bergmann. "Ranging and interferometry with frequency shifted feedback lasers". In SPIE Proceedings, a cura di Guenter Huber, Vladislav Y. Panchenko e Ivan A. Scherbakov. SPIE, 2005. http://dx.doi.org/10.1117/12.660836.

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Marc, F., H. Guillet de Chatellus e J. P. Pique. "Solid-state frequency-shifted-feedback laser for astronomy". In 11th European Quantum Electronics Conference (CLEO/EQEC). IEEE, 2009. http://dx.doi.org/10.1109/cleoe-eqec.2009.5192087.

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Yoshida, M., M. Fujimoto, M. Nakazawa e H. Ito. "A mode-locked frequency-shifted feedback fiber laser". In CLEO 2001. Technical Digest. Summaries of papers presented at the Conference on Lasers and Electro-Optics. Postconference Technical Digest. IEEE, 2001. http://dx.doi.org/10.1109/cleo.2001.947833.

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Shore, K. A., e D. M. Kane. "Frequency comb generation using semiconductor lasers subject to frequency-shifted feedback". In 1999 Digest of the LEOS Summer Topical Meetings: Nanostructures and Quantum Dots/WDM Components/VCSELs and Microcavaties/RF Photonics for CATV and HFC Systems (Cat. No.99TH8455). IEEE, 1999. http://dx.doi.org/10.1109/leosst.1999.794652.

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