Tesis sobre el tema "High power lasers engines"
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MIRIGALDI, ALESSANDRO. "Power scaling of high power lasersystems". Doctoral thesis, Politecnico di Torino, 2022. http://hdl.handle.net/11583/2966325.
Texto completoElliott, Stella N. "High power semiconductor lasers". Thesis, Cardiff University, 2010. http://orca.cf.ac.uk/54136/.
Texto completoAlvarez-Chavez, Jose Alfredo. "High-power fibre lasers". Thesis, University of Southampton, 2003. https://eprints.soton.ac.uk/15478/.
Texto completoAbram, Richard Henry. "High power waveguide array lasers". Thesis, Heriot-Watt University, 1998. http://hdl.handle.net/10399/622.
Texto completoPark, Jung-Hyun. "High-gain, high-power free electron lasers". Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/30964.
Texto completoVoughs, Tyrone Y. "High-power amplifier free electron lasers". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2006. http://library.nps.navy.mil/uhtbin/hyperion/06Jun%5FVoughs.pdf.
Texto completoThesis Advisor(s): William B. Colson, Robert L. Armstead. "June 2006." Includes bibliographical references (p. 57). Also available in print.
Hastie, Jennifer E. "High power surface emitting semiconductor lasers". Thesis, University of Strathclyde, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399721.
Texto completoWang, Jing. "High-average-power planar waveguide lasers". Thesis, University of Southampton, 2007. https://eprints.soton.ac.uk/50198/.
Texto completoPusino, Vincenzo. "High power, high frequency mode-locked semiconductor lasers". Thesis, University of Glasgow, 2014. http://theses.gla.ac.uk/5174/.
Texto completoTisch, John William George. "Studies of high harmonic generation using high power lasers". Thesis, Imperial College London, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.309530.
Texto completoJain, Deepak. "Novel optical fibers for high power lasers". Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/386233/.
Texto completoMartin, Kevin Ian. "High power, diode pumped, single frequency lasers". Thesis, University of Southampton, 1996. https://eprints.soton.ac.uk/396626/.
Texto completoBRAGLIA, ANDREA. "High Power Fiber Lasers for Industrial Applications". Doctoral thesis, Politecnico di Torino, 2013. http://hdl.handle.net/11583/2506061.
Texto completoNaidoo, Darryl. "High brightness lasers". Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/97044.
Texto completoKheder, Abdul-Sameei Yaseen. "Starting high inertia, high friction loads from limited power sources". Diss., The University of Arizona, 1988. http://hdl.handle.net/10150/184455.
Texto completoOttaway, David. "Medium power stable lasers for high precision metrology /". Title page, abstract and contents only, 1998. http://web4.library.adelaide.edu.au/theses/09PH/09pho89.pdf.
Texto completoFrist, Duane C. "Improved beam jitter control methods for high energy laser systems". Thesis, Monterey, California : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Dec/09Dec%5FFrist.pdf.
Texto completoThesis Advisor(s): Agrawal, Brij ; Kim, Jae Jun. "December 2009." Description based on title screen as viewed on January 28, 2010. Author(s) subject terms: High Energy Laser (HEL), beam control, Fast Steering Mirror (FSM), two axis gimbal, stabilization, video tracking, feedforward control, adaptive filter. Includes bibliographical references (p. 69). Also available in print.
Murray, Paul R. "High peak power, pulsed, planar waveguide CO2 lasers". Thesis, Heriot-Watt University, 2000. http://hdl.handle.net/10399/1225.
Texto completoScahill, Charlanne Mary. "Design of high power, single frequency semiconductor lasers". Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624851.
Texto completoNikitichev, Daniil I. "High power ultra-short pulse quantum-dot lasers". Thesis, University of Dundee, 2012. https://discovery.dundee.ac.uk/en/studentTheses/b7cec111-5ed7-4020-9fad-794d817e8f61.
Texto completoFriel, Graham John. "Diode-pumped Nd:YLF lasers for high-power operation". Thesis, University of Southampton, 1998. https://eprints.soton.ac.uk/394397/.
Texto completoVazquez, Zuniga Luis Alonso. "Ultrafast high power fiber lasers and their applications". Thesis, University of Southampton, 2012. https://eprints.soton.ac.uk/340703/.
Texto completoChard, Simon Peter. "Development of versatile high power bounce geometry lasers". Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/6184.
Texto completoLi, Hongbo. "Modeling Compact High Power Fiber Lasers and VECSELs". Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/202712.
Texto completoBai, Jinxu. "High Power High Energy Ytterbium-doped Fiber Amplifier System". Research Showcase @ CMU, 2016. http://repository.cmu.edu/dissertations/728.
Texto completoSims, Robert. "Development of Thulium Fiber Lasers for High Average Power and High Peak Power Operation". Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5706.
Texto completoPh.D.
Doctorate
Optics and Photonics
Optics and Photonics
Optics
Barber, J. R. "Variable-compression-ratio pistons for high power output diesel engines". Thesis, Brunel University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379249.
Texto completoSmith, Scott A. "High power infrared vertical external cavity surface emitting lasers". Thesis, University of Strathclyde, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501809.
Texto completoLee, Shinwook. "HIGH POWER MODE-LOCKED SEMICONDUCTOR LASERS AND THEIR APPLICATIONS". Doctoral diss., University of Central Florida, 2008. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3195.
Texto completoPh.D.
Optics and Photonics
Optics and Photonics
Optics PhD
Holdsworth, Adrian Richard. "Brightness conserving optical systems for high power diode lasers". Thesis, Heriot-Watt University, 1999. http://hdl.handle.net/10399/583.
Texto completoHayward, Robert Alan. "High-power diode-pumped solid-state 2 micron lasers". Thesis, University of Southampton, 2003. https://eprints.soton.ac.uk/41525/.
Texto completoSaadat, S. "Investigation of the generation of high-density matter using high power lasers". Thesis, Queen's University Belfast, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373544.
Texto completoStrauss, Hencharl Johan. "Thermo-optical effects in high-power end-pumped vanadate lasers". Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4007.
Texto completoENGLISH ABSTRACT: The output power of end-pumped lasers is mainly limited by thermal effects in the bulk crystal gain material. The thermal effects either fracture the crystal or cause degradation in the laser beam quality and output power. This is especially pronounced in Nd:YVO4 and Nd:GdVO4 which exhibit strong thermal lensing. These two Nd3+ vanadate materials are of great value because of their high emission cross sections which makes them excellent gain materials for mode-locked, high repetition rate Q-switched and intra-cavity frequency doubled lasers. The two Nd3+ vanadates have very similar spectral properties but many publications claim that the more expensive Nd:GdVO4 is thermo-optically superior to Nd:YVO4. However, a debate ensued after theoretical calculations as well as measurements of the thermal conductivity and thermo-optical coefficients indicated that the opposite is true. To our knowledge there has never been a direct comparison of the thermal lensing of these two materials under identical pumping and lasing conditions. In order to contribute to the debate we did such measurements for different crystals of these two materials with equal low doping using three different measurement methods. We subsequently determined that Nd:YVO4 has slightly lower thermal lensing for the stronger gain -polarisation. One of the measurement methods we used is a novel more reproducible one that we developed for this purpose. It is more reproducible because it selectively measures only the focal length of the central, relatively unaberrated part of the thermal lens. Another measurement, utilising a probe beam through the laser crystal, found that there was almost no increase in the temperature when lasing is interrupted. This indicated that there is almost no upconversion present in the crystals which is probably due to their optimally chosen low doping. A further consequence of the vanadate debate is that there is still confusion about the value of the important thermo-optical coefficient for the higher gain -polarisation (dne/dT ) of Nd:YVO4. This parameter is of great importance in thermal calculations since the strength of the thermal lens is largely dependent on it. We therefore numerically modelled the thermal lensing in our crystals using different dne/dT values and found that the value given by Sato & Taira (2007) matches our experimental results the best. Our measurements also indicated that the thermal lens dioptric power increased nonlinearly with pump power. This appeared to contradict theory of thermal lensing since we knew that there was no upconversion in the crystals (which is the standard explanation for the nonlinear increase). We proceeded to use our numerical modelling to identify the main source of the nonlinear increase as the varying spectral output of the diode pump laser. The findings in this thesis therefore extend knowledge of the thermo-optical properties of the vanadates and increase understanding of the strongly aberrated thermal lenses formed inside them. Furthermore, the findings now enable the power-scaling of end-pumped vanadates lasers to higher levels.
AFRIKAANSE OPSOMMING: Die uitset drywing van longitudinale-gepompte vaste-toestand lasers word hoofsaaklik beperk deur termiese effekte in die laser kristal. Die kristal word of gekraak of die laser se bundel kwaliteit en uitset drywing verminder. Dit is veral ’n problem in Nd:YVO4 en Nd:GdVO4 kristalle waarin sterk termiese lense voorkom. Hierdie twee Nd3+ vanadaat kristalle is waardevol vanwee hulle ho¨e emissie deursnitte wat hulle uitstekend maak as versterkings materiale vir modus-gesinkroniseerde, ho¨e repitisie, Q-geskakelde en binne-resonator frekwensie-verdubbelde lasers. Die twee vanadate het baie soortgelyke spektrale eienskappe, maar verskeie publikasies beweer dat die duurder Nd:GdVO4 materiaal termo-opties beter is as Nd:YVO4. Onlangse teoretiese berekeninge asook metings van die termiese en termo-optiese kwaliteite van die twee kristalle toon egter die teenoorgestelde. Sover ons weet is daar nog geen direkte vergelyking van die termiese lens in hierdie twee materiale onder identiese kondisies gedoen nie. Ons het dus so ’n meting aangepak vir kristalle met identiese lae konsentrasie van die Nd3+ ioon deur drie verskillende meet metodes te gebruik. Een van die meet metodes is ’n nuwe, meer reproduseerbare metode wat ons ontwikkel het vir hierdie doel. Dit is meer reproduseerbaar omdat dit slegs die binneste deel van die termiese lens meet wat min sferiese aberrasie het. ’n Ander meeting, wat ’n toets-bundel deur die kristal stuur, het getoon dat daar byna geen verhoging in die die temperatuur van die kristal was toe ossilasie in die resonator onderbreek was nie. Dit is ’n aanduiding dat dat daar byna geen op-omskepping teenwoordig is in die kristalle nie wat te danke is aan hul optimale lae konsentrasie van die Nd3+ ioon. ’n Verdere gevolg van die debat is dat daar nog verwarring in die literatuur bestaan oor die waarde van Nd:YVO4 se termo-optiese dne/dT koeffisi¨ent. Hierdie parameter is van groot belang in berekinge van die termiese lens se fokale lengte vir die ho¨er wins -polarisasie. Deur numeriese modellering te gebruik het ons bevind dat die waarde wat verskaf word deur Sato & Taira (2007) ons eksperimentele data die beste pas. Ons metings het ook aangedui dat die dioptriese krag van die termiese lens nie linie¨er toeneem ten opsigte van die geabsorbeerde pomp krag nie. Dit was o¨enskynlik teenstryding met teorie oor termiese lense. Dit is omdat ons bevestig het dat daar geen op-omskepping in die kristalle teenwoordig was nie, wat die standaard verklaring vir die nie linie¨eriteit is. Ons het dus ons numeriese modellering gebruik om die hoofbron van die nie-lini¨ere toename te identifiseer as die veranderende spektrale uitset van die diode pomp laser. Die bevindings in hierdie tesis bou dus kennis op oor die termo-optiese eienskappe van die vanadate en versterk begrip van die sterk termiese lense binne hulle. Verder stel die bevindings ons nou in staat om die uitset drywing van longitudinale-gepompte vanadaat lasers na ho¨er vlakke te skaal.
Bogan, Christina [Verfasser]. "Stabilized High Power Lasers and Spatial Mode Conversion / Christina Bogan". München : Verlag Dr. Hut, 2013. http://d-nb.info/1033041505/34.
Texto completoZhang, Zhichao. "Numerical Modelling of High-Power Self-Organizing External Cavity Lasers". Thesis, University of Nottingham, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.523226.
Texto completoJain, Apurva. "Applications of Volume Holographic Elements in High Power Fiber Lasers". Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5318.
Texto completoPh.D.
Doctorate
Optics and Photonics
Optics and Photonics
Optics
Tandoi, Giuseppe. "Monolithic high power mode locked GaAs/AlGaAs quantum well lasers". Thesis, University of Glasgow, 2011. http://theses.gla.ac.uk/2721/.
Texto completoDeile, Jochen. "Power scaling of high brightness multi-kilowatt coaxial CO2 lasers". Thesis, Heriot-Watt University, 2013. http://hdl.handle.net/10399/3297.
Texto completoCooper, Laurence James. "Fabrication of novel geometry fibre lasers for high power applications". Thesis, University of Southampton, 2005. https://eprints.soton.ac.uk/38958/.
Texto completoChen, Kang Kang. "High power pulsed ytterbium doped fibre lasers and their applications". Thesis, University of Southampton, 2011. https://eprints.soton.ac.uk/207735/.
Texto completoWang, Tsuei-Lian. "High-Power Optically Pumped Semiconductor Lasers for Near Infrared Wavelengths". Diss., The University of Arizona, 2012. http://hdl.handle.net/10150/242398.
Texto completoHempel, Martin. "Defect mechanisms in diode lasers at high optical output power". Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2013. http://dx.doi.org/10.18452/16834.
Texto completoThe scope of this thesis is the time-resolved investigation of the catastrophic optical damage (COD) and the identification of the underlying physical mechanisms. The COD has been separated in three temporal phases: the aging, the thermal runaway (self-amplifying feedback mechanism), and the secondary defect growth. It was possible to reduce the first phase to a couple of nano-seconds by applying a new accelerated life test scheme. It was experimentally verified that the laser light is the primary energy source of COD. The applied thermographic technologies allowed an in-situ tracing of the defect growth. A fast thermo cycle during the passage of the defect front was confirmed by this direct measurement, a modeling of the heat flow, and a crystallographic material analysis. Different experimental setups indicate the presence of a temperature in the range of 1200°C-1500°C at the defect front, during the entire COD-degradation. Even if no lasing action is present anymore, the amplified spontaneous emission is sufficient to provide enough energy for further defect growth. In order to initiate the thermal runaway, a specific temperature difference is necessary between the COD-starting location and the remaining active laser material. This thesis provides an analysis of the mechanisms leading to such a situation. This kind of analysis was used to develop a new model of the geometrical defect growth. The ability to re-construct the defect dynamics based on ex-post analysis of the defect pattern allows for the identification of bottlenecks in the investigated device design leading to COD.
Bouras, Vasileios. "High energy lasers for ship-defense and maritime propagation". Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Dec%5FBouras.pdf.
Texto completoThesis advisor(s): William B. Colson, Phillip E. Pace. Includes bibliographical references (p. 81-83). Also available online.
Seifert, Frank [Verfasser]. "Power stabilization of high power lasers for second generation gravitational wave detectors / Frank Seifert". Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover, 2010. http://d-nb.info/1008410470/34.
Texto completoDenvir, Donal Joseph. "Interaction of high power laser radiation with liquids". Thesis, Queen's University Belfast, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235828.
Texto completoUre, K. A. N. "The generation of short, tunable high power optical pulses". Thesis, University of Southampton, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.383874.
Texto completoAkbar, Jehan. "High power mode locked lasers monolithically integrated with semiconductor optical amplifiers". Thesis, University of Glasgow, 2012. http://theses.gla.ac.uk/3461/.
Texto completoLee, Jason Robert. "High power, diode-pumped, planar waveguide lasers with excellent beam quality". Thesis, Heriot-Watt University, 2002. http://hdl.handle.net/10399/443.
Texto completoKao, Tsung-Yu. "From high power terahertz quantum cascade lasers to terahertz light amplifiers". Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/87923.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (pages 201-208).
The terahertz (THz) frequency range (300 GHz to 10 THz, wavelength 30-1000 [mu]m), despite having many potential applications, is technologically relatively underdeveloped mainly because of the lack of suitable coherent radiation sources when compared with nearby electromagnetic radiation spectrum. The invention of the THz quantum cascade laser, a electronically-pumped semiconductor heterostructure which emits photons from electronic intersubband transitions, provides the first solidstate fundamental oscillator at the frequency range from 1.2 to 5.1 THz. Due to the subwavelength confinement nature of the metal-metal waveguide used in most of the THz QC lasers, far-field beam patterns from lasers with simple Fabry-Perot waveguides are divergent and far from ideal Gaussian beams. The first part of this thesis describes the development of single-mode THz QC lasers on metal-metal waveguides. Starting with the corrugated third-order DFB laser-a clever laser structure which utilizes end-fire array effect to achieve low divergence beam patterns-several applications using densely-packed third-order DFB laser arrays, such as frequency agile sources for THz swept-source optical tomography and local oscillators for THz heterodyne receivers with precise frequency control, have been investigated. With the improved design rules and fabrication techniques, 830 GHz single-mode frequency coverage on a monolithic multicolor DFB laser array has been achieved. The origin of the deterioration in far-field beam patterns and power outputs in long third-order DFB lasers is then identified. This finding leads to a modified third-order DFB laser structure which can achieve perfect phase-matching (PM) condition, resulting in scalable power output and even lower beam divergence when compared with that of a conventional third-order DFB laser. Radiations from up to 151 laser sectors are phase-locked to form a single-lobe beam pattern with divergence ~ 6 x 11° and ~13 mW pulsed power at the end-fire direction. This approach substantially increases the usable length of a third-order DFB laser while keeping a high slope efficiency (140 mW/A). Later development applies the concept of microstrip antenna-a structure commonly used in microwave engineering-to THz photonics devices. By coupling the microstrip antenna to each grating aperture of a perfectly phase-matched DFB laser, the radiation impedance of the laser can now be tuned to enhance the overall emission efficiency. This novel genre of DFB laser achieves > 8 mW pulsed power (10% duty-cycle) at 12 K with beam divergence as low as 12.5 x 12.5' and maximum lasing temperature Tmax = 109 K (pulsed) and 77 K (c.w.) with the highest slope efficiency (~450 mW/A) and wall-plug efficiency (0.57%) of all THz DFB laser sources. The second part of the thesis then focuses on the development of the first light amplifier in THz frequency under Fabry-Perot amplifier (FPA) scheme. Although amplification at terahertz frequency in quantum cascade structures has been demonstrated under the transient state or in a integrated platform, none of them is suitable for amplifying continuous-wave free-space THz radiations. The proposed amplifier is consisted of an array of short-cavity surface-emitting second-order distributed feedback lasers arranged in a two-dimensional grid which are operated marginally beneath their lasing thresholds. A overall system power gain of ~5.6x = 7.5 dB at ~3 THz is obtained with ~1 GHz bandwidth. The free-space THz light amplifier can be used as the pre-amplifier for a THz heterodyne receiver system to reduce the receiver system noise, or be placed on the focal plane of a THz imaging system to enhance the signal-to-noise ratio of the image and reduce the acquisition time. A new locking mechanism for two-dimensional phase-locked laser arrays based on antenna mutual-coupling is also proposed and then successfully demonstrated in the THz frequency using short-cavity DFB THz lasers. Up to 37 lasers are phase-locked to deliver 6.5 mW single-mode pulsed power (4% duty-cycle) at 3 THz with symmetric beam pattern (< 10 x 10°). This new coupling scheme can be extended to other electromagnetic systems with sub-wavelength confined elements such as plasmonic lasers and nanolasers. This thesis also reports the development of fabrication techniques required to bring the aforementioned novel THz cavity designs from concepts to reality which include a high aspect ratio (> 1:10) anisotropic reactive-ion etch on GaAs which is compatible with the metal-metal waveguide platform and the procedure to create airbridge structures by selectively removing the dielectric materials beneath the metal contacts.
by TsungYu Kao.
Ph. D.
Daniel, Jae. "Wavelength selection and transverse mode control in high power fibre lasers". Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/371750/.
Texto completo