Bibliographies thématiques / High power lasers engines

Littérature scientifique sur le sujet « High power lasers engines »

Auteur : Grafiati
Publié le 14 mars 2023

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Articles de revues sur le sujet "High power lasers engines"

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Cheng, Dennis, Dixon Fung et Karl Guttag. « Digital High Resolution Small Pixel LCOS Technology ». Solid State Phenomena 181-182 (novembre 2011) : 233–36. http://dx.doi.org/10.4028/www.scientific.net/ssp.181-182.233.

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The progress in digital high resolution, small pixel liquid crystal on silicon (LCOS) microdisplays will be discussed and how it will lead to HD displays in very small form factors. The first generation of this technology is enabling very small yet high resolution projection engines devices that can be embedded in cell phones, cameras, head-mount displays, and set-top boxes and the next generation will bring HD resolution. As lasers become more affordable we see this LCOS display technology fundamentally changing the power consumption, cost, and size of pico-projectors and other display devices. One of the most interesting conclusions is that by using LCOS technology in combination with lasers, it should soon be possible to build an “ultra-green” television that would consume less than 1/8th the power of equivalent size LCD flat panel TV.
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HENTSCHEL, Werner. « New methods in optical diagnostics on production engines with only minor modifications ». Combustion Engines 137, no 2 (1 mai 2009) : 50–61. http://dx.doi.org/10.19206/ce-117193.

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The aim of this paper is to demonstrate the performance of micro-invasive optical diagnostics as advanced tools in the development process of modern direct-injection (DI) gasoline engines. The use of endoscopes and optical probes minimise the mechanical modifications on the engine necessary to achieve the optical access to the combustion chamber. No expensive optical engines with large optical windows are required but only small holes of about 10 mm in the cylinder head or in a plate between cylinder head and cylinder liner are used to apply laser diagnostics. Basic in-cylinder phenomena, such as the formation of the flow field, the penetration of the spray at high fuel pressure, the interaction of spray and flow, the formation of an ignitable mixture and the start of combustion are analysed in detail. High-power solid-state pulsed lasers emitting ultraviolet or green light, state-of the-art high-speed colour video cameras, and newly designed optical probes were used for the investigations. Selected results from current research and development work demonstrate the capability of micro-invasive techniques and pinpoint how the design of the combustion process benefits from these experimental investigations.
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Афанасьєва, Ольга Валентинівна, Наталія Олексіївна Лалазарова et Олена Георгіївна Попова. « Нові технології лазерної поверхневої обробки ». Aerospace technic and technology, no 2 (28 avril 2021) : 59–65. http://dx.doi.org/10.32620/aktt.2021.2.07.

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Subject and purpose. Currently, gas, solid-state, and fiber lasers are used to process materials in the aviation industry. For the thermal treatment of steels, gas CO2 lasers with a capacity of more than 1 kW used, which are reliable in operation but have high cost and low efficiency. There are no results on the use of low-power (up to 20 W) pulsed-mode lasers for surface hardening of steel products. The purpose of this work is to determine the modes of surface hardening of products from carbon and alloy steels using low-power solid-state pulsed YAG lasers. Methodology. For laser hardening, a 5 W solid-state YAG laser was used (diode pumping, radiation wavelength λ = 1,064 μm, pulse mode). The use of a nonlinear crystal made it possible to obtain UV radiation with λ = 0,355 μm (third harmonic). The following modes were investigated: processing with single pulses (duration 0,1...0,4 ms) and multi-pulse processing with short (30...70 ms) pulses. The scanning speed was 8...2 mm/s. The energy in the pulse was determined by the photoelectric method. Thermal hardening was performed on the following steels: У12, P6M5. The possibility of UV radiation hardening was evaluated on steel 20, 45, У12, and ШХ15. Findings. The optimum values of pulse duration for maximum hardness in laser hardening of the investigated steels. With multi-pulse treatment of steels, the pulse duration is shorter than with single-pulse treatment, the hardening intensity is higher, and the quality of the processed surface is better. Single-pulse and multi-pulse processing are accompanied by partial melting of the surface of steel products, which does not allow it to be used in cases where a high quality of the surface is required. Laser hardening of steel by ultraviolet radiation is not accompanied by melting. Conclusion. For surface hardening of products, where partial melting of the surface is possible, low-power lasers in pulse mode can be used. Laser hardening by ultraviolet radiation is a promising direction for thermal hardening of steels, which allows maintaining the original quality of the surface layer. Thermal hardening with low-power lasers can be effective for small-sized areas of the processed parts of the fuel equipment of aircraft engines, friction elements, and, especially, the tool is small.
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Cattoni, Francesca, Lucrezia Ferrante, Sara Mandile, Giulia Tetè, Elisabetta Maria Polizzi et Giorgio Gastaldi. « Comparison of Lasers and Desensitizing Agents in Dentinal Hypersensitivity Therapy ». Dentistry Journal 11, no 3 (27 février 2023) : 63. http://dx.doi.org/10.3390/dj11030063.

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The main objective of this review is to verify the validity of laser therapy in the treatment of dentin hypersensitivity, an extremely common problem in patients, with Nd: YAG lasers or high- and/or low-power diode lasers to obtain a definitive protocol for the treatment of hypersensitivity, given the multiplicity of laser treatments proposed by the numerous authors evaluated. The authors performed an electronic search on PubMed, favouring it as a search engine. Lasers represent a means of treating dentin hypersensitivity, used alone and/or in conjunction with specific products for the treatment of such a pathology. The selected articles that examined diode lasers were divided according to the wattage (w) used: low-level laser therapy protocols, i.e., those using a wattage of less than 1 W, and high-level laser therapy protocols, i.e., those using a wattage of 1 W or more. Regarding the Nd: YAG laser, it was not necessary to subdivide the studies in this way, as they used a wattage of 1 W or more. A total of 21 articles were included in the final selection. Laser therapy was found to be effective in the treatment of dentin hypersensitivity. However, the level of effectiveness depends on the laser used. The results obtained from this review show that both the Nd: YAG laser and the diode laser (high and low power) are effective in the treatment of dentin hypersensitivity. However, the high-power laser appears to be more effective in combination with fluoride varnish and the Nd: YAG laser achieved greater long-term benefits than the diode laser.
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George Done, Bogdan, et Ion Copae. « Performances of a Research CFR Octane Rating Unit Engine and Dacia Single Cylinder SI Engine Ignited by a LASER System ». E3S Web of Conferences 112 (2019) : 01009. http://dx.doi.org/10.1051/e3sconf/201911201009.

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At this time, the severe legislation regarding the level limits of the waste and exhaust gases released by thermal engines and also the necessity of engines efficiency improvement boost the engine research domain to bring in front the use of new technologies that can be used to control the in-cylinder combustion process. Now, the new technologies is represented by LASER spark plug systems which can be successfully used at petrol engines. LASER spark plug technology can have many advantages for engine operation control, an ignition system that could provide improved combustion is the one using plasma generation and a Q-switched LASER that results in pulses with high MW power. The LASER spark plug device used in the current research was a LASER medium Nd:YAG/Cr4+:YAG ceramic structure made up of a 8.0-mm long, 1.0-at.% Nd:YAG ceramic, optically-bonded to a Cr4+:YAG c. It was developed and constructed similar to classical spark plug and could be assembled on a CFR Octane Rating Unit Engine as well as on a Dacia Single Cylinder SI Engine which led to several results among which: influences on in-cylinder pressure, combustion and pollutant emissions.
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Barbato, Alessio, et Giuseppe Cantore. « 3D CFD simulation of a gaseous fuel injection in a hydrogen-fueled internal combustion engine ». E3S Web of Conferences 312 (2021) : 07001. http://dx.doi.org/10.1051/e3sconf/202131207001.

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Nowadays, one of the hottest topic in the automotive engineering community is the reduction of fossil fuels. Hydrogen is an alternative energy source that is already providing clean, renewable, and efficient power being used in fuel cells. Despite being developed since a few decades, fuel cells are affected by several hurdles, the most impacting one being their cost per unit power. While waiting for their cost reduction and mass-market penetration, hydrogen-fueled internal combustion engines (H2ICEs) can be a rapidly applicable solution to reduce pollution caused by the combustion of fossil fuels. Such engines benefit from the advanced technology of modern internal combustion engines (ICEs) and the advantages related to hydrogen combustion, although some modifications are needed for conventional liquid-fueled engines to run on hydrogen. The gaseous injection of hydrogen directly into the combustion chamber is a challenge both for the designers and for the injection system suppliers. To reduce uncertainties, time, and development cost, computational fluid dynamics (CFD) tools appear extremely useful, since they can accurately predict mixture formation and combustion before the expensive production/testing phase. The high-pressure gaseous injection which takes place in Direct-Injected H2ICEs promotes a super-sonic flow with very high gradients in the zone between the bulk of the injected hydrogen and the flow already inside the combustion chamber. To develop a methodology for an accurate simulation of these phenomena, the SoPHy Engine of the Engine Combustion Network group (ECN) is used and presented. This engine is fed through a single nozzle H2-injector; planar laser-induced fluorescence (PLIF) data are available for comparison with the CFD outcomes.
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SHAPIRO, D. « ION LASER THEORY ». International Journal of Modern Physics B 10, no 18n19 (30 août 1996) : 2405–22. http://dx.doi.org/10.1142/s0217979296001070.

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Ion lasers, especially argon, are the most powerful sources of visible and near UV continuous coherent radiation. The active medium of lasers is low-temperature plasma. They are familiar to scientists and engineers from the 70’s. However, a series of physical effects remained unclear and there was a barrier to enhancing the power and improving the quality of the output radiation. The theory of ion lasers is developed at the interface between plasma physics and quantum optics. This paper covers the solution of some of these physical problems, particularly, the high-current regime of gas discharge and the quantum kinetics of ionic collisions. The high-current multi-component discharge is important for intense generation in the ultraviolet spectrum. The ionic scattering leads to the Lamb dip broadening in the single-frequency laser and increases its output.
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Pielecha, Ireneusz, Zbigniew Stępień, Filip Szwajca et Grzegorz Kinal. « Effectiveness of Butanol and Deposit Control Additive in Fuel to Reduce Deposits of Gasoline Direct Injection Engine Injectors ». Energies 16, no 1 (21 décembre 2022) : 77. http://dx.doi.org/10.3390/en16010077.

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Modern internal combustion engines are designed to meet new emission standards and reduce fuel consumption. The wide application of direct fuel injection is associated with the problem of injector contamination. It leads to a deterioration of the engine’s environmental performance. The paper aims to evaluate the effect of applying gasoline–butanol blends and appropriate additives on the formation of injector deposits. The research involved testing the engine on a dynamometer, evaluating the injector tips visually at 1000× magnification, and registering the fuel spray using high-speed imaging techniques with a laser and halogen lighting source. The effect of engine operating with the reference fuel was to coke the injector tip with a linear pattern. It increased the linear injection time to keep the engine’s operating point constant over the 48 h test. The application of 20% (v/v) butanol reduced deposit formation. The best scavenging results were obtained by extending the engine operating time by the next 24 h and using a cleaning procedure. The procedure included a cleaning additive in addition to butanol. Among the cases analyzed, a combination of butanol and DCA (Deposit Control Additive) was the best method for injector patency restoration.
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Allocca, L., L. Andreassi et S. Ubertini. « Enhanced Splash Models for High Pressure Diesel Spray ». Journal of Engineering for Gas Turbines and Power 129, no 2 (4 septembre 2006) : 609–21. http://dx.doi.org/10.1115/1.2432891.

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Mixture preparation is a crucial aspect for the correct operation of modern direct injection (DI) Diesel engines as it greatly influences and alters the combustion process and, therefore, the exhaust emissions. The complete comprehension of the spray impingement phenomenon is a quite complete task and a mixed numerical-experimental approach has to be considered. On the modeling side, several studies can be found in the scientific literature but only in the last years complete multidimensional modeling has been developed and applied to engine simulations. Among the models available in literature, in this paper, the models by Bai and Gosman (Bai, C., and Gosman, A. D., 1995, SAE Technical Paper No. 950283) and by Lee et al. (Lee, S., and Ryou, H., 2000, Proceedings of the Eighth International Conference on Liquid Atomization and Spray Systems, Pasadena, CA, pp. 586–593; Lee, S., Ko, G. H., Ryas, H., and Hong, K. B., 2001, KSME Int. J., 15(7), pp. 951–961) have been selected and implemented in the KIVA-3V code. On the experimental side, the behavior of a Diesel impinging spray emerging from a common rail injection system (injection pressures of 80 and 120MPa) has been analyzed. The impinging spray has been lightened by a pulsed laser sheet generated from the second harmonic of a Nd-yttrium-aluminum-garnet laser. The images have been acquired by a charge coupled device camera at different times from the start of injection. Digital image processing software has enabled to extract the characteristic parameters of the impinging spray with respect to different operating conditions. The comparison of numerical and experimental data shows that both models should be modified in order to allow a proper simulation of the splash phenomena in modern Diesel engines. Then the numerical data in terms of radial growth, height and shape of the splash cloud, as predicted by modified versions of the models are compared to the experimental ones. Differences among the models are highlighted and discussed.
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Kopecek, Herbert, Soren Charareh, Maximilian Lackner, Christian Forsich, Franz Winter, Johann Klausner, Gu¨nther Herdin, Martin Weinrotter et Ernst Wintner. « Laser Ignition of Methane-Air Mixtures at High Pressures and Diagnostics ». Journal of Engineering for Gas Turbines and Power 127, no 1 (1 janvier 2005) : 213–19. http://dx.doi.org/10.1115/1.1805550.

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Methane-air mixtures at high fill pressures up to 30 bar and high temperatures up to 200°C were ignited in a high-pressure chamber with automated fill control by a 5 ns pulsed Nd:YAG laser at 1064 nm wavelength. Both, the minimum input laser pulse energy for ignition and the transmitted fraction of energy through the generated plasma were measured as a function of the air/fuel-equivalence ratio (λ). The lean-side ignition limit of methane-air mixtures was found to be λ=2.2. However, only λ<2.1 seems to be practically usable. As a comparison, the limit for conventional spark plug ignition of commercial natural gas engines is λ=1.8. Only with excessive efforts λ=2.0 can be spark ignited. The transmitted pulse shape through the laser-generated plasma was determined temporally as well as its dependence on input laser energy and properties of the specific gases interacting. For a first demonstration of the practical applicability of laser ignition, one cylinder of a 1 MW natural gas engine was ignited by a similar 5 ns pulsed Nd:YAG laser at 1064 nm. The engine worked successfully at λ=1.8 for a first test period of 100 hr without any interruption due to window fouling and other disturbances. Lowest values for NOx emission were achieved at λ=2.05 NOx=0.22 g/KWh. Three parameters obtained from accompanying spectroscopic measurements, namely, water absorbance, flame emission, and the gas inhomogeneity index have proven to be powerful tools to judge laser-induced ignition of methane-air mixtures. The following effects were determined by the absorption spectroscopic technique: formation of water in the vicinity of the laser spark (semi-quantitative); characterization of ignition (ignition delay, incomplete ignition, failed ignition); homogeneity of the gas phase in the vicinity of the ignition; and the progress of combustion.
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Thèses sur le sujet "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.

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Elliott, Stella N. « High power semiconductor lasers ». Thesis, Cardiff University, 2010. http://orca.cf.ac.uk/54136/.

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Using red and near infra-red emitting quantum well and quantum dot based devices I have modelled the nearfield and farfield intensities and distribution in various waveguide structures. I compared the effect of various factors on the power density at catastrophic damage and found the greatest effect from the current pulse length and dot or well nature of the active region, for the first time in the AlGaInP material system. At short pulse length the quantum dot devices achieved a power density of 17 MW/cm2 compared to 14 MW/cm2 for quantum well lasers, and then proved by electron microscopy and photocurrent spectroscopy not to have reached their limit for mirror damage, but to have failed by other means. I observed the loss of optical power at catastrophic optical mirror damage in real time, applying single, very high current pulses, observing differences in the behaviour of quantum dot, which showed little or no facet damage, and quantum well devices, which showed large amounts of damage, with a resolution of tens of nanoseconds compared to microseconds in the literature. I proposed an explanation for the time taken for the power level to drop, which remained finite at about 200 ns in quantum well devices, in terms of the energy required to melt the observed quantity of damaged material.
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Alvarez-Chavez, Jose Alfredo. « High-power fibre lasers ». Thesis, University of Southampton, 2003. https://eprints.soton.ac.uk/15478/.

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This thesis reports on the experimental study of high-power, high-energy, cladding-pumped, rare-earth (Yb3+, Er3+/Yb3+)-doped fibre lasers. Some of the main capabilities of fibre lasers such as: High brightness and thermal properties were exploited for the development of a variety of continuous wave (CW) and Q-switched devices, whose characteristics also includes compactness. Our devices could already be considered an option for several applications. The 25-year long scientific and commercial evolution that fibre lasers have experienced is discussed in the first two chapters. The invention of Erbium-doped fibre amplifiers (EDFA's) and Internet were two major breakthroughs, which launched the need of WDM systems and laser sources. Fibre lasers, are now considered a flexible and powerful device whose technology has finally reached its maturity. Cladding pumping is the technique employed in these experiments in order to pump double clad fibre lasers using high power, broad stripes and bars. In this work, several inner cladding shapes have been used to overcome the normally high mismatch between diode laser beams and inner cladding areas of fibre lasers. Chapter Three consists of a review of cladding-pumped fibre lasers. It describes how inner cladding geometry and pump absorption limits the output power scalability of these devices. Nonlinear effects and amplified spontaneous emission are also studied due to their implication they have over fibre lasers performance. Results on conventional, continuous wave (CW) fibre lasers including fibre characterization and employed launching techniques are described in Chapter Four. A new method to obtain high intensity laser beam output from an Yb3+-doped, cladding-pumped, highly multimode fibre laser has been proposed. In this experiment, we propose the use of fibre tapers to increase intensity and improve beam quality. In CW regime, our results show an intensity increase of ~3.5 times with a low power penalty of ~1 dB. Also, without tapering, a maximum output power of 21-W was reached with a slope efficiency of >80%. Using a simple set of optic elements such as a l/2 waveplate, a polarizing beam-splitter and a bulk grating, we investigated the polarization characteristics of an Yb3+ fibre laser, from which we obtained 6.5 W of single polarization tunable output in the range of 1070 to 1106 nm. As a free running laser, the system produced 18 W at 1090 nm and showed a threshold of 1.8 Watts. The experiment is our first approach for developing a reliable high-power Yb3+-doped fibre source, that could be used in conjunction with optical parametric oscillators (OPO) and amplifiers (OPA) to frequency convert to a broad band of wavelengths. Using a new design of ytterbium-doped fibre made in-house with the conventional modified chemical vapor deposition (MCVD) process, we explored the possibilities of energy storage with such a large mode area (LMA) fibre. The fibre system was capable of delivering energetic pulses of >2 mJ, which could suggest the feasibility of a pulsed fibre laser in the region of tens of milli-Joules. The experiment is described in Chapter Six, on which the experiment that uses the tapered fibre laser in Q-Switched regime is also described and compared to LMA fibre laser. Gaussian-type pulses were obtained which reached pulse energies of 0.6 mJ at 4 kHz using a tapered fibre laser and 1.3 mJ at 500 Hz using conventional laser, corresponding to average powers of 2.1 Watts for the tapered laser and 0.8 watts for the conventional laser. Er3+/Yb3+-doped fibre lasers were part of our experimental work. This co-doping technique allows pumping of Yb3+ ions using broad-stripe high-power pump sources to reach much higher output power levels. Efficient energy transfer from excited Ytterbium ions into Erbium is achieved. From a preliminary study, the fibre laser showed a threshold of 160 mW and a slope efficiency of 49% with respect to absorbed pump power. The maximum output power was 6.2 watts at 1535 nm and a linewidth of 1 nm. One of our co-doped fibre devices produced 16.8 W of continuous wave, multimode laser power at the interesting wavelength of operation of 1550 nm. Finally, conclusions and future work are included in Chapter Eight.
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Abram, Richard Henry. « High power waveguide array lasers ». Thesis, Heriot-Watt University, 1998. http://hdl.handle.net/10399/622.

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Park, Jung-Hyun. « High-gain, high-power free electron lasers ». Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/30964.

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The Paladin FEL experiment is shown to exhibit clear and dramatic effects governed by the electron beam velocity distribution for the first time. The FEL integral equation is used to show that there is significant broadening of the gain spectrum due to the Gaussian velocity distribution, and also shows a plateau in the gain evolution along the undulator due to a triangular-shaped velocity distribution. The gain spectra and power evolution from simple, single- mode simulations are compared to the ELF experiments. The microwave power evolution along the undulator is compared as well for both the tapered and untapered undulators. In all cases, the agreement is found to be good.
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Voughs, 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.

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Thesis (M.S. in Applied Physics)--Naval Postgraduate School, June 2006.
Thesis Advisor(s): William B. Colson, Robert L. Armstead. "June 2006." Includes bibliographical references (p. 57). Also available in print.
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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.

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Wang, Jing. « High-average-power planar waveguide lasers ». Thesis, University of Southampton, 2007. https://eprints.soton.ac.uk/50198/.

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Reported in this thesis is some progress towards high-average-power diode-pumped planar waveguide lasers. As a format of the laser active medium, planar waveguides take advantage of their extreme slab geometry, which is compatible with that of high-power diode lasers, offer a great degree of versatility of the pump arrangement, have excellent thermal handling capability, and deliver high optical gains per unit pump power. Pumped with different schemes, three kinds of planar waveguides are investigated herein: direct-bonded double-clad planar waveguides, ion-exchanged tapered waveguides, and thick films fabricated by pulsed laser deposition, of which a double-clad planar waveguide produced laser output power of up to 58W. PLD planar waveguides are investigated as a flexible alternative in high-power planar waveguide laser systems. As an initial demonstration, a slope efficiency of 11.2% was obtained from a diode-stack-pumped 50μm Nd:GGG PLD waveguide. The effect of self-imaging was observed with a 27μm Nd:GGG PLD waveguide.
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Pusino, Vincenzo. « High power, high frequency mode-locked semiconductor lasers ». Thesis, University of Glasgow, 2014. http://theses.gla.ac.uk/5174/.

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Integrated mode-locked laser diodes are effective sources of periodic sequences of optical pulses, which have always been of great interest for a range of spectroscopy, imaging and optical communications applications. However, some disadvantages prevent their widespread use, such as the restricted tuning of their repetition rate and their output power levels never exceeding a few mW. This thesis reports on the work done to address those limitations. Two main findings are presented, the first being the generation of ultra-high repetition rate optical signals through external injection of two continuous wave signals. This mechanism is much simpler than other techniques previously proposed to increase the repetition rate of monolithic modelocked laser, and has proved successful in generating optical signals up to quasi-THz. It is based on injection of two continuous wave signals whose spacing is an integer multiple of the pulsed cavity free spectral range and whose injection wavelengths coincide with two of the monolithic laser modes. This technique allows discrete tunability of the repetition rate with a step equal to the injected cavity free spectral range, and the injected laser has been shown to lock up to a repetition rate of 936 GHz, corresponding to 26 times that of the free-running semiconductor laser (36 GHz). The presented scheme is suitable for integration, opening the way for a successful on-chip generation of ultra-high repetition rate optical signals exploiting coupled cavity phenomena. The second main finding of this thesis regards the changes induced on the pulsed operation of monolithic passively mode-locked lasers by a blue bandgap detuning applied to their saturable absorber. The quantum well intermixing technique has been used for attaining an area-selective bandgap shift on the fabricated chip, being fully postgrowth. The lasers with a detuned absorber were found to have an extended range of gain section currents and absorber voltages in which stable mode-locking operation took place. Furthermore, a comparison of mode-locked devices fabricated on the same chip, respectively with and without a bandgap detuned absorber, showed that the emitted pulses had greater peak power and were less affected by optical chirp when the bandgap of the absorbing section was shifted. A new intermixing technique has also been developed as part of this work to address some inconsistencies of the pre-existing one; the newly introduced approach has been found to provide better spatial resolution and a more precise control of the attained bandgap shift.
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Tisch, 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.

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Livres sur le sujet "High power lasers engines"

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Mason, Richard. Feasibility of laser power transmission to a high-altitude unmanned aerial vehicle. Santa Monica, CA : RAND, 2011.

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A, Niku-Lari, et Mordike B. L, dir. High power lasers. Oxford : Pergamon, 1989.

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A, Niku-Lari, et Mordike Barry L, dir. High power lasers. Oxford : Pergamon Press, 1989.

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4

Power lasers. Chichester, West Sussex, England : E. Horwood, 1987.

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5

Diehl, Roland, dir. High-Power Diode Lasers. Berlin, Heidelberg : Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/3-540-47852-3.

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Bachmann, Friedrich, Peter Loosen et Reinhart Poprawe, dir. High Power Diode Lasers. New York, NY : Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-34729-5.

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Duarte, Francisco J., dir. High-Power Dye Lasers. Berlin, Heidelberg : Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-540-47385-5.

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J, Duarte F., dir. High-power dye lasers. Berlin : Springer-Verlag, 1991.

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Duarte, Francisco J. High-Power Dye Lasers. Berlin, Heidelberg : Springer Berlin Heidelberg, 1991.

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High power laser handbook. New York : McGraw-Hill Professional, 2011.

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Chapitres de livres sur le sujet "High power lasers engines"

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Rezunkov, Yuri A. « Aerospace Laser-Propulsion Engine ». Dans High Power Laser Propulsion, 133–70. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-79693-8_4.

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Wenzel, Hans, et Anissa Zeghuzi. « High-Power Lasers ». Dans Handbook of Optoelectronic Device Modeling and Simulation, 15–58. Boca Raton, FL : CRC Press, Taylor & Francis Group, [2017] | : CRC Press, 2017. http://dx.doi.org/10.4324/9781315152318-2.

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Ostermayr, Tobias. « High-Power Lasers ». Dans Springer Theses, 33–44. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-22208-6_3.

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Meyer, Johan, Justice Sompo et Sune von Solms. « High-Power Fiber Lasers ». Dans Fiber Lasers, 341–71. Boca Raton : CRC Press, 2021. http://dx.doi.org/10.1201/9781003256380-8.

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Duarte, Francisco J. « Dispersive Dye Lasers ». Dans High-Power Dye Lasers, 7–43. Berlin, Heidelberg : Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-540-47385-5_2.

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Ter-Mikirtychev, Vartan V. « High-Power Fiber Lasers ». Dans Springer Series in Optical Sciences, 175–225. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-33890-9_10.

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Ter-Mikirtychev, Valerii. « High-Power Fiber Lasers ». Dans Springer Series in Optical Sciences, 161–208. Cham : Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-02338-0_10.

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Figueroa, Luis. « High-Power Semiconductor Lasers ». Dans Optoelectronic Technology and Lightwave Communications Systems, 335–62. Dordrecht : Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-011-7035-2_13.

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Hanke, Christian. « High Power Diode Lasers ». Dans NATO ASI Series, 139–55. Boston, MA : Springer US, 1993. http://dx.doi.org/10.1007/978-1-4615-2998-9_9.

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Webb, C. E. « High-Power Dye Lasers Pumped by Copper Vapor Lasers ». Dans High-Power Dye Lasers, 143–82. Berlin, Heidelberg : Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-540-47385-5_5.

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Actes de conférences sur le sujet "High power lasers engines"

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Sheik-Bahae, Mansoor, Zhou Yang et Saeid Rostami. « Optimization of high-power radiation-balanced disc lasers (Conference Presentation) ». Dans Photonic Heat Engines : Science and Applications, sous la direction de Richard I. Epstein, Denis V. Seletskiy et Mansoor Sheik-Bahae. SPIE, 2019. http://dx.doi.org/10.1117/12.2508878.

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Myrabo, Leik N., M. A. Libeau, E. D. Meloney, R. L. Bracken et T. B. Knowles. « Pulsed laser propulsion performance of 11-cm parabolic bell engines within the atmosphere ». Dans High-Power Laser Ablation 2004, sous la direction de Claude R. Phipps. SPIE, 2004. http://dx.doi.org/10.1117/12.547439.

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Masaki Tsunekane, Takayuki Inohara, Akihiro Ando, Kenji Kanehara et Takunori Taira. « Compact, high peak power, passively Q-switched micro-laser for ignition of engines ». Dans 2008 Conference on Lasers and Electro-Optics (CLEO). IEEE, 2008. http://dx.doi.org/10.1109/cleo.2008.4550994.

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Motamedi, M. Edward, Sangtae Park, Robert Melendes, A. Wang, Angus P. Andrews, Dawn S. Garcia-Nunez, Dan Jinar et al. « MOEM scan engine for bar code reading and factory automation ». Dans Optoelectronics and High-Power Lasers & Applications, sous la direction de M. Edward Motamedi et Rolf Goering. SPIE, 1998. http://dx.doi.org/10.1117/12.302410.

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Sirazetdinov, Vladmir S., Inga V. Ivanova, Anatoly D. Starikov, David H. Titterton, Tatyana A. Sheremetyeva, Gennadii N. Filippov et Yurii N. Yevchenko. « Experimental study of the structure of laser beams disturbed by turbulent stream of aircraft engine ». Dans Symposium on High-Power Lasers and Applications, sous la direction de Yehuda B. Band. SPIE, 2000. http://dx.doi.org/10.1117/12.382078.

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Tsunekane, Masaki, et Takunori Taira. « High Peak Power Micro-Laser for Ignition of Automobile Engines ». Dans Laser and Tera-Hertz Science and Technology. Washington, D.C. : OSA, 2012. http://dx.doi.org/10.1364/ltst.2012.mf3a.2.

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Williams, K. A., I. H. White, R. V. Penty, D. J. Robbins et J. J. Lewandowski. « Design of High Power Tapered Waveguide Semiconductor Lasers ». Dans The European Conference on Lasers and Electro-Optics. Washington, D.C. : Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cthg4.

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A two-dimensional dynamic beam propagation model [1] has been developed to isolate mechanisms for far field broadening and engineer improved laser beam quality in high brightness tapered waveguide lasers. These low beam divergence, high brightness devices have many possible applications, including low-cost pumps for fibre amplifiers and lasers. Spatially resolved thermal models have so far been used to describe the role of hot spots on filamentation in tapered waveguide amplifiers [2]. Here we show theoretically for the first time that the far field narrows with good suppression of higher order modes for an appropriate temperature rise, without significant power penalty, in agreement with experiment.
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Mobini, Esmaeil, Saeid Rostami, Mostafa Peysokhan, Alexander R. Albrecht, Stefan Kuhn, Sigrun Hein, Christian Hupel et al. « Anti-Stokes fluorescence cooling of a Yb-doped silica glass preform using a high-power laser ». Dans Photonic Heat Engines : Science and Applications III, sous la direction de Masaru K. Kuno, Denis V. Seletskiy et Mansoor Sheik-Bahae. SPIE, 2021. http://dx.doi.org/10.1117/12.2579925.

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Pavel, Nicolaie, Traian Dascalu, Mihai Dinca, Gabriela Salamu, Nicolae Boicea et Adrian Birtas. « Laser Ignition of an Automobile Engine by a High-Peak Power Nd:YAG/Cr4+:YAG Laser ». Dans Advanced Solid State Lasers. Washington, D.C. : OSA, 2015. http://dx.doi.org/10.1364/assl.2015.ath2a.2.

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Liu, Yu-Da, Yu-Kuan Lu, Ying-Chien Tsai, Li-Jin Wang, Szu-Ming Yeh et Wood-Hi Cheng. « A New Scheme of Aspherical Microlense for Efficient Coupling High-Power Lasers to Fibers ». Dans National Fiber Optic Engineers Conference. Washington, D.C. : OSA, 2011. http://dx.doi.org/10.1364/nfoec.2011.jtha4.

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Rapports d'organisations sur le sujet "High power lasers engines"

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Ballato, John, Martin Richardson, Michael Bass et Bryce Samson. High Power Fiber Lasers. Fort Belvoir, VA : Defense Technical Information Center, août 2012. http://dx.doi.org/10.21236/ada570856.

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Byer, R. L., R. M. Gaume, R. K. Route et Y. He. Ceramics for High Power Lasers. Fort Belvoir, VA : Defense Technical Information Center, décembre 2011. http://dx.doi.org/10.21236/ada564677.

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Lester, Luke, et Ganesh Balakrisnan. Supplemental Task-High Power Lasers. Fort Belvoir, VA : Defense Technical Information Center, décembre 2011. http://dx.doi.org/10.21236/ada566138.

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Byer, Robert L., Romain M. Gaume, Roger K. Route et Charles Rudy. Ceramics for High Power Lasers. Fort Belvoir, VA : Defense Technical Information Center, juillet 2013. http://dx.doi.org/10.21236/ada585299.

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Gauthier, Daniel J. Compact, High-Power Two-Photon Lasers. Fort Belvoir, VA : Defense Technical Information Center, septembre 1995. http://dx.doi.org/10.21236/ada300412.

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Gauthier, Daniel J. Compact, High-Power, Two-Photon Lasers. Fort Belvoir, VA : Defense Technical Information Center, septembre 1995. http://dx.doi.org/10.21236/ada300483.

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Mocofanescu, Anca, et Ravinder Jain. Advanced High-Power Near-Infrared Fiber Lasers. Fort Belvoir, VA : Defense Technical Information Center, septembre 2005. http://dx.doi.org/10.21236/ada439073.

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Siders, C. W., et C. Haefner. High-Power Lasers for Science and Society. Office of Scientific and Technical Information (OSTI), octobre 2016. http://dx.doi.org/10.2172/1331445.

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Holzrichter, J. F., E. M. Campbell, J. D. Lindl et E. Storm. Research with high-power short-wavelength lasers. Office of Scientific and Technical Information (OSTI), mars 1985. http://dx.doi.org/10.2172/5725713.

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Lancaster, David. Germanate Glass Fiber Lasers for High Power. Fort Belvoir, VA : Defense Technical Information Center, janvier 2016. http://dx.doi.org/10.21236/ada637443.

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