Relevant bibliographies by topics / Lasers

Academic literature on the topic 'Lasers'

Author: Grafiati
Published: 4 June 2021
Last updated: 30 July 2024

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Journal articles on the topic "Lasers"

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Pinto, Ana M. R., and Manuel Lopez-Amo. "All-fiber lasers through photonic crystal fibers." Nanophotonics 2, no. 5-6 (December 16, 2013): 355–68. http://dx.doi.org/10.1515/nanoph-2013-0026.

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AbstractA review on all-fiber lasers based on photonic crystal fibers is presented. Photonic crystal fibers present improved features beyond what conventional optical fibers can offer. Due to their geometric versatility, photonic crystal fibers can present special properties and abilities which can lead to enhanced lasing structures. A brief description of photonic crystal fibers and fiber laser’s properties is presented. All-fiber laser structures developed using photonic crystal fibers are described and divided in two groups, depending on the cavity topology: ring cavity fiber lasers and linear cavity fiber lasers. All-fiber lasers applications in the photonic crystal fiber related sensing field are described.
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Nemova, Galina. "Brief Review of Recent Developments in Fiber Lasers." Applied Sciences 14, no. 6 (March 10, 2024): 2323. http://dx.doi.org/10.3390/app14062323.

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This review covers the recent achievements in high-power rare earth (RE)-doped fiber lasers, Raman fiber lasers, and Brillouin fiber lasers. RE-doped fiber lasers have many applications such as laser cutting, laser welding, laser cleaning, and laser precision processing. They operate in several wavelength ranges including 1050–1120 nm (ytterbium-doped fiber lasers), 1530–1590 nm (erbium- and erbium–ytterbium-doped fiber lasers), and 1900–2100 nm (thulium- and holmium-doped fiber lasers). White spaces in the wavelength spectrum, where no RE-doped fiber lasers are available, can be covered by Raman lasers. The heat power generated inside the laser active medium due to the quantum defect degrades the performance of the laser causing, for example, transverse-mode instability and thermal lensing. It can even cause catastrophic fiber damage. Different approaches permitting the mitigation of the heat generation process are considered in this review. Brillouin fiber lasers, especially multiwavelength Brillouin fiber lasers, have several important applications including optical communication, microwave generation, and temperature sensing. Recent progress in Brillouin fiber lasers is considered in this review.
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Yan, Senlin. "Controlling two chaotic lasers via OD-DCF." ITM Web of Conferences 47 (2022): 03003. http://dx.doi.org/10.1051/itmconf/20224703003.

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We present a novelty optoelectronic delay double-cross-feedback (OD-DCF) scheme to control two chaotic lasers based on coupled lasers. We design out the OD-DCF technical solution to convert two lights from two lasers into two photocurrents by two photo-detectors, and then the delay photocurrents are cross-fed back to each other’s lasers respectively to suppress two chaotic oscillations and guide two laser’s dynamics behaviours, respectively. By adjusting the feedback levels and delayed time of OD-DCF, two lasers can obtain chaos-control and show all kinds of dynamics behaviours. We find that chaotic oscillation behaviours of two lasers are suppressed into a stable state and different quasi-cycle states, such as a cycle-one, cycle-two, a cycle-three, a cycle-four, and other quasi-cycle states. We find also that two movement behaviours of two lasers can be controlled to lead to two different cycle-double states. The results prove that the control of two chaotic lasers can be effectively realized via OD-DCF. It is very helpful for our studies of control science, nonlinear optics, chaos, and laser.
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Kwaśna, Magdalena, Paulina Cłapińska, Zuzanna Piosik, Kamila Barysz, Iga Dubiec, Adam Bęben, and Iwona Ordyniec-Kwaśnica. "Intraoral Applications of Lasers in the Prosthetic Rehabilitation with Fixed Partial Dentures—A Narrative Review." Dentistry Journal 12, no. 6 (May 31, 2024): 164. http://dx.doi.org/10.3390/dj12060164.

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Laser, an acronym for Light Amplification by Stimulated Emission of Radiation, is a powerful tool with diverse applications in modern dentistry. It emits monochromatic, coherent light resulting from photon-induced chain reactions. Available dental lasers include diode, argon, Er,Cr:YSGG, Er:YAG, Nd:YAG, and CO2. The unique property of these lasers, allowing them to be effectively used on both soft and hard tissues based on the operational parameters, positions them as particularly suited for a wide range of dental procedures. Compared to traditional methods, lasers offer advantages such as improved hemostasis and quicker wound healing. Such benefits stress the shift towards laser technology in dental treatment. In the realm of dental prosthodontics, which focuses on esthetics, functionality, and the physiological aspects of dental prostheses, lasers provide promising outcomes. Among the prosthetic options, fixed partial dentures stand out for their ability to mimic natural teeth, offering both esthetic and functional features, leading to satisfactory long-term outcomes if managed properly. This review paper delves into the specific application of laser technology in the context of prosthetic rehabilitation involving fixed partial dentures. By investigating intraoral laser procedures, it contributes to understanding laser’s role in improving patients’ satisfaction and clinical efficiency in this field.
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Nemova, Galina. "Radiation-Balanced Lasers: History, Status, Potential." Applied Sciences 11, no. 16 (August 17, 2021): 7539. http://dx.doi.org/10.3390/app11167539.

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The review of history and progress on radiation-balanced (athermal) lasers is presented with a special focus on rare earth (RE)-doped lasers. In the majority of lasers, heat generated inside the laser medium is an unavoidable product of the lasing process. Radiation-balanced lasers can provide lasing without detrimental heating of laser medium. This new approach to the design of optically pumped RE-doped solid-state lasers is provided by balancing the spontaneous and stimulated emission within the laser medium. It is based on the principle of anti-Stokes fluorescence cooling of RE-doped low-phonon solids. The theoretical description of the operation of radiation-balanced lasers based on the set of coupled rate equations is presented and discussed. It is shown that, for athermal operation, the value of the pump wavelength of the laser must exceed the value of the mean fluorescence wavelength of the RE laser active ions doped in the laser medium. The improved purity of host crystals and better control of the transverse intensity profile will result in improved performance of the radiation-balanced laser. Recent experimental achievements in the development of radiation-balanced RE-doped bulk lasers, fibre lasers, disk lasers, and microlasers are reviewed and discussed.
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Parkprom, P., N. Chattrapiban, P. Sompet, and N. Thaicharoen. "Laser linewidth measurement using beat-note technique." Journal of Physics: Conference Series 2653, no. 1 (December 1, 2023): 012081. http://dx.doi.org/10.1088/1742-6596/2653/1/012081.

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Abstract Lasers play a crucial role in quantum and atomic physics experiments. To prepare atoms in a desired quantum state, these lasers must possess specific properties, including tunability and a narrow spectral linewidth. In this study, we construct and employ an external cavity diode laser to prepare cold rubidium atoms. We control the laser’s stability using an electronic system and evaluate its performance by measuring the spectral linewidth through the beat signal technique. The measurement indicates a linewidth narrower than 1 MHz, which makes the laser suitable for subsequent experiments. Finally, we adjust the laser frequency to match the rubidium transition frequency between states 5S 1/2, F = 2 ↔ 5P 3/2, F′ = 2, and successfully utilizing the laser to prepare cold rubidium atoms in a magneto-optical trap.
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Zivkovic, Slavoljub, Larisa Blazic, and Mila Kolar. "Lasers in dentistry." Serbian Dental Journal 51, no. 3 (2004): 146–52. http://dx.doi.org/10.2298/sgs0403146z.

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Lasers and laser technology is now used in many medical and dental indications. The aim of this study was to demonstrate many excellent points that should be considered by the dentist who is contemplating the use of lasers in dental practice. The interaction of laser radiation on soft tissue enables dry and bloodless surgery, minimal postoperative swelling and scarring, and minimal postoperative pain. Lasers for hard tisues encourage efficient diagnosis of caries and improve the resistence of dental enamel to caries, laser etching of enamel, cavity preparations, photopolymerization of composite resin and sterilization of the root canal system. All staff who are involved in using lasers must be trained with regard to treatment protocols and safety measures. All personnel and the patient must wear safety-approved glasses.
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Huang, Qin, Zucen Li, Ping Lyu, Xuedong Zhou, and Yi Fan. "Current Applications and Future Directions of Lasers in Endodontics: A Narrative Review." Bioengineering 10, no. 3 (February 26, 2023): 296. http://dx.doi.org/10.3390/bioengineering10030296.

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The utilization of lasers has been regarded as a novel technique for the purposes of clinical use in the dental field. Recently, numerous studies have been conducted on the potential applications of laser therapy in endodontics. Moreover, due to their ablation, penetrability, and disinfection capabilities, lasers have performed well with respect to endodontic treatments, including root canal treatment, vital pulp therapy (pulp capping and pulpotomy), dentinal hypersensitivity treatment, and management of dental pain related to pulp and periradicular disease. In particular, the superiorities of laser-aided pulp therapy are emphasized through condensed clinical controlled trials, and histological studies, in this review. Moreover, the ingenious use of laser applications with respect to aiding in the acceleration of root development and the extraction of foreign matters (i.e., broken files and fiber posts) in canals has quickly become the cutting-edge trend of current research. This review offers a summary and discussion of the current literature on all the aforementioned laser applications. Moreover, the characteristics of laser devices, including erbium lasers, neodymium-doped lasers, CO2 lasers, and diode lasers, are detailed and discussed here, providing useful references for laser application in endodontics. We also focus on the different wavelengths with respect to the lasers that are applied in endodontics. High-power lasers perform well as operative instruments; in addition, low-level lasers lead to the regulation of pulp inflammation, and the promotion of pulp healing. This narrative review provides a summary of the advanced applications of lasers in conjunction with various devices in the practice of endodontics, and aims to inspire innovative perspectives on lasers in the context of the treatment of dental diseases, especially pulp diseases, in the future.
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AlDomyati, Roaa, Raghad Bajaber, Faisal Alrumi, Maram Alghamdi, Abdulkarim Alharbi, Nasser Alsour, Somaya Alhaf, et al. "The Use of Lasers in Pediatric Dentistry: Applications, Benefits, and Limitations." JOURNAL OF HEALTHCARE SCIENCES 03, no. 10 (2023): 427–35. http://dx.doi.org/10.52533/johs.2023.31009.

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The application of laser technology in pediatric dentistry holds immense promise for improving the quality of care and treatment experiences for young patients. Laser technology offers efficient methods for diagnosing and addressing oral and dental issues in children, encompassing both soft and hard tissues. Research indicates that the use of lasers in restorative, pulpal, and surgical procedures enhance children's cooperation and results in better care quality. Different kinds of lasers, including laser fluorescence (LF), argon lasers, erbium lasers, and CO2 lasers, are used in a range of dental applications, such as identifying, preventing, and treating cavities, as well as performing various other dental procedures. Laser technology also offers benefits in endodontics, soft tissue applications, trauma management, pain relief, and orthodontics. However, the implementation of lasers requires specialized training, initial investment costs, and careful infection control measures. Despite these limitations, lasers hold the potential to become a standard approach in pediatric dentistry, revolutionizing the way oral and dental issues are diagnosed and treated in young patients.
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Neauport, Jérôme, and Sebastien Vermersch. "Le laser Megajoule." Photoniques, no. 126 (2024): 22–26. http://dx.doi.org/10.1051/photon/202412622.

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Dédié à l’étude des plasmas denses et chauds au sein du programme de Simulation du CEA DAM, le laser Mégajoule est actuellement l’un des lasers les plus énergétiques du monde. Après la mise en route d’une première chaîne laser en 2014, il comprend aujourd’hui 11 chaines lasers (soit 88 faisceaux lasers) délivrant quotidiennement jusqu’à 330 kJ d’énergie sur cible à la longueur d’onde de 351 nm. Nous décrivons le système laser LMJ, les performances atteintes dans sa configuration actuelle, ainsi que les campagnes lasers conduites pour amener l’installation à une énergie de 1.3 MJ, une fois les 22 chaines lasers montées et qualifiées.
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Dissertations / Theses on the topic "Lasers"

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Friart, Gaetan. "Semiconductor laser dynamics: two polarization feedback, quantum cascade lasers, and ring lasers." Doctoral thesis, Universite Libre de Bruxelles, 2017. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/248835.

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Semiconductor lasers (Sls) are very sensitive to external perturbations which may destabilize their steady output. This is particularly striking when the SL is subject to optical feedback, i.e. when part of the light coming out of the laser is reinjected in the cavity after reflection from a distant mirror. For some applications, this is a nuisance that we wish to avoid. But optical feedback may also drive the laser into dynamical regimes which are useful for new applications. In this thesis, we study different problems where an SL is subject to a delayed feedback or to an injected signal. These problems are motivated by recent experiments, technological issues, or particular dynamical phenomena. Specifically, we combine analytical techniques, numerical simulations, and experiments to investigate the bifurcation mechanisms leading to a large variety of oscillatory outputs. The systems that we discuss are an edge-emitting laser with polarization-rotated optical feedback, a two-mode laser with optical injection, a quantum cascade laser with optical feedback, and a semiconductor ring laser with optical feedback. We show that the bifurcations from the steady-states are of primary importance. They not only delimit the stability boundaries of the laser output but they also form the backbone structure of many pulsating waveforms. We investigate these bifurcations in detail in order to find the best operating conditions to observe specific dynamical regimes. Our results highlight laser key parameters that allow their efficient control.
Les lasers à semi-conducteur sont sensibles aux perturbations externes et celles-ci peuvent déstabiliser leur faisceau de sortie d’intensité constante. Ceci est particulièrement marquant quand le laser à semi-conducteur est sujet à un feedback optique, c’est-à-dire quand une partie de la lumière sortant du laser est réinjectée dans sa cavité après réflexion par un miroir distant. Pour certaines applications, cela représente une nuisance que l’on souhaite éviter. Mais le feedback optique peut aussi engendrer des régimes dynamiques utiles pour de nouvelles applications. Dans cette thèse, nous étudions différents problèmes où un laser à semi-conducteur est soumis à un feedback retardé ou à un signal injecté. Nos travaux sont motivés par de récentes expériences, des questions technologiques ou des phénomènes dynamiques particuliers. Nous combinons des techniques analytiques, des simulations numériques ainsi que des expériences afin d’analyser les mécanismes de bifurcation menant à une large variété de régimes oscillants.Nous étudions en premier lieu la dynamique d’un laser à semi-conducteur soumis à un feedback avec rotation de la polarisation. Nous examinons, à la fois théoriquement et expérimentalement, la séquence de bifurcations menant à des oscillations sous forme d’ondes carrées. Nous mettons en évidence une multistabilité entre différentes ondes carrées de périodes spécifiques. Nous introduisons alors un mécanisme de contrôle qui nous permet de sélectionner l’onde carrée désirée. Nous analysons ensuite les frontières de stabilité d’un laser à semi-conducteur à deux polarisations soumis à une injection optique. Nous montrons que si les gains des deux modes de polarisation sont suffisamment proches, un état stationnaire mixte stable peut exister. Nous explorons également les conditions permettant une bistabilité entre un état stationnaire pur et un état stationnaire mixte. Les lasers à cascade quantique sont de nouveaux lasers à semi-conducteur prometteurs qui possèdent une forte tolérance au feedback optique. Nous examinons de façon systématique leur stabilité dans la limite des grands retards. Nous montrons que des instabilités oscillantes sont cependant possibles pour de faibles valeurs du courant de pompe. Le dernier dispositif que nous étudions dans cette thèse est le laser à semi-conducteur en anneau soumis à un feedback optique. Nous identifions le mécanisme de bifurcation, appelé pont de bifurcation, responsable des instabilités oscillantes dans le faisceau de sortie du laser. Ces oscillations sont indésirables pour la plupart des applications impliquant de tels lasers. Nous montrons qu’elles peuvent être évitées en contrôlant la phase du feedback.
Doctorat en Sciences
info:eu-repo/semantics/nonPublished
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Wadsworth, W. J. "Copper vapour laser pumped TI:sapphire lasers." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389029.

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Maker, Gareth Thomas. "Diode laser pumped solid state lasers." Thesis, University of Southampton, 1990. https://eprints.soton.ac.uk/397281/.

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This thesis deals with the development of diode laser pumped solid state lasers. The earliest work presented enabled 125W peak power, single frequency Q-switched pulses to be obtained from a 100mW diode laser pumped Nd:YAG laser. Using a 500mW diode laser as a pump source for C.W. Nd:YAG and Nd:YLF oscillators an Yb:Er fibre laser was pumped, producing 0.75mW C.W. power at a wavelength of 1.56µm. Acousto-optic mode-locking techniques were used to provide C.W. mode-locked pulse durations in Nd:YAG and Nd:YLF of 55ps and 18ps respectively, at repetition rates of 240MHz. Frequency modulation mode-locking was shown to be a superior technique, giving pulse durations of 11.5ps and 10ps in diode laser pumped Nd:YAG and Nd:YLF oscillators respectively. FM operation of diode laser pumped Nd:YAG lasers was investigated, yielding a maximum FM bandwidth of 70GHz. Spatial hole burning was considered to be an important factor in this result. Using a 1W diode laser to pump a mode-locked and Q-switched Nd:YLF oscillator peak power levels of 70kW were obtained at a wavelength of 1.047µm. Frequency doubling this output in MgO:LiNbO3 with an energy conversion efficiency of 47% enabled other tunable lasers to be pumped using the second harmonic. Firstly, a synchronously pumped rhodamine 6G dye laser is described which is capable of producing 3.2ps mode-locked pulses in a Q-switched envelope with peak powers of around 10kW. Secondly, a synchronously pumped doubly resonant optical parametric oscillator tunable between 983nm and 1119nm is described. Lastly, a Ti:Sapphire laser producing 400ns pulses with peak powers of 3W at a wavelength of 755nm is demonstrated. This oscillator could be wavelength tuned between 746nm and 838nm. A highly efficient method of frequency doubling C.W. mode-locked lasers was developed. Using an external resonant cavity a frequency doubling energy conversion efficiency of 61% to 532nm was achieved, giving 87mW average power in 8.5ps pulses.
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Kapitan, Daniel. "Laser ablation with copper vapour lasers." Thesis, University of Oxford, 1999. https://ora.ox.ac.uk/objects/uuid:a1dc1a3b-602a-4ebb-abe2-734e8e11f15a.

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The use of copper vapour lasers for laser ablation in laser materials processing applications is studied. To this purpose, the generation of near diffraction-limited beam quality output from a single medium-scale oscillator is demonstrated via matching the total buffer gas pressure to the specific electrical input power loading and the degree of insulation of the plasma tube. The design and characterisation of a Master-Oscillator Power-Amplifier system based on a smallbore oscillator is also described, focusing on pulse stretching techniques to provide efficient seeding required for producing 20-50 W high beam-quality output for laser materials processing purposes. Various experimental studies on the fundamental processes of laser ablation of metals are presented. The effect of the background gas properties on shock-wave formation in laser generated plasmas is studied using a ballistic pendulum. The experimental findings are found to be accurately described by a modified Sedov-Taylor-Von Neumann theory which accounts for the effect of the piston-mass. The theory is applied to characterise the fluorination process in the shock-wave, in view of oxygen isotope analysis in geochemistry. Atomic emission spectroscopy is shown to provide some measure of the electron temperature and electron density at the plasma core. The experimental results are discussed in view of existing models to describe the extreme Stark-broadening and self-absorption in dense, cool plasmas. A comparative study of the use of femtosecond and nanosecond pulsed lasers for laser ablation of metals is presented to assess the relative importance of thermal diffusion. Measurement of the recoil momentum due to ejection of molten particulates during ablation in vacuum provides insight into the effect of material properties. Diffusion-limited surface texturing of metals via direct transfer of an optical interference patterns is demonstrated.
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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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Hempler, Nils. "Semiconductor disk laser pumped Cr²⁺:chalcogenide lasers." Thesis, University of Strathclyde, 2010. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=15339.

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Chaaban, Hani. "Etudes et conception de sources lasers. Mise au point de lasers submillimétriques : application à l'analyse des spectres induits." Aix-Marseille 3, 1988. http://www.theses.fr/1988AIX30051.

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Un laser co#2 continu construit au laboratoire est stabilise en puissance et utilise pour pomper un laser moleculaire. L'utilisation du methanol comme milieu amplificateur permet d'apprecier le fonctionnement sur de nombreuses raies irl. Deux lasers co#2 a impulsions balayables et monomodes ont ete perfectionnes, permettant par l'intermediaire d'un cristal non lineaire d'obtenir la generation d'ondes submillimetriques par difference des frequences (voisines) des lasers primaires. Une application est faite a l'etude du spectre induit de l'azote vers quelques cm##1. On calcule les moments spectraux et les temps de relaxation
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Zhu, Xiang. "Tunable diode lasers and their applications in trace gas and liquid detection /." *McMaster only, 1996.

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Serres, Serres Josep Maria. "Continuous-wave and passively Q-switched solid-state microchip lasers in the near-infrared." Doctoral thesis, Universitat Rovira i Virgili, 2017. http://hdl.handle.net/10803/460758.

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Aquest treball tracta de la caracterització de làsers compactes d'estat sòlid, amb un primer enfocament, l'estudi del concepte microxip aplicat al làser en diversos hostes cristal·lins dopats amb terres rares. Es reporta els resultats sobre l'estudi de l'efecte de thermal lens, necessari per a l'obtenció de làser amb aquesta configuració, així com pel funcionament làser amb continu i polsat utilitzant la tècnica Q-switch. En els experiments, el concepte microxip es defineix com una cavitat làser quasi monolítica. Aquest concepte s'estudia per a diferents emissions de làser a ~1.06 m d'ions Yb3+ i Nd3+, a ~1,3 m de Nd3+, a ~1,95 m de Tm3+ hi ha ~2.05 m del Ho3+. En el règim d'ona contínua s'examina detalladament per als ions de lantànids trivalents esmentats en diversos hostes cristal·lins amb l'objectiu de comparar el potencial de cada material. En aquest treball, es demostren eficiències molt properes al límit teòric. D'altra banda, també es presenten làsers polsats d'estat sòlid amb la configuració microxip amb diversos absorbidors saturables. Amb aquest propòsit, s'utilitzen com a absorbidors saturables nous nanomaterials com el MoS2, nanoestructures de carboni (SWCNT, el grafè d'una i de diverses capes) i un SESA. A més, el més convencional Cr:YAG (~1.06 m) i el Cr:ZnS (~1.9 m) s'examinen per comparar els seus rendiments.
Este trabajo trata de la caracterización de láseres compactos de estado sólido, con primer enfoque, el estudio del concepto microchip aplicado al láser en varios huéspedes cristalinos dopados con tierras raras. Se reporta los resultados sobre el estudio del efecto de la thermal lens, necesario para la obtención de láser con esta configuración, así como para el funcionamiento láser en continuo y pulsado utilizando la técnica Q-switch. En los experimentos, el concepto microchip se define como una cavidad láser casi monolítica. Este concepto se estudia para diferentes emisiones de láser a ~1.06 m de los iones Yb3+ y Nd3+, a ~1,3 m de Nd3+, a ~1,95 m de Tm3+ hay ~2.05 m del ion Ho3+. En régimen de onda continua se examina detalladamente para los iones de lantánidos trivalentes mencionados en varios huéspedes cristalinos con el objetivo de comparar el potencial de cada material. En este trabajo, se demuestran eficiencias muy cercanas al límite teórico. Por otra parte, también se presentan láseres pulsados de estado sólido con la configuración microchip con varios absorbedores saturables. Con este propósito, se utilizan como absorbedores saturables nuevos nanomateriales como el MoS2, nano-estructuras de carbono (SWCNT, el grafeno de una y de varias capas) y un SESA. Además, el más convencional Cr:YAG (~1.06 m) y el Cr:ZnS (~1.9 m) se examinan para comparar sus rendimientos
This work deals with the characterization of compact solid state lasers, as a first approach to the study of the microchip laser concept applied to several rare earth-doped crystalline hosts. The results on the study of the thermal lens, required for the microchip laser operation as well as the continuous wave and passive Q-switched laser operation in microchip configuration are reported. In the experiments, the microchip concept is defined as a quasi-monolithic laser cavity. Such a concept is studied for different laser emissions at ~1.06 μm from Yb3+ and Nd3+ ions, at ~1.3 μm from Nd3+, at ~1.95 μm from Tm3+ and at ~2.05 μm from Ho3+. The continuous wave regime is examined in detail for the above mentioned trivalent lanthanide ions embedded in several crystalline hosts with the aim to compare the potential of each gain material. Slope efficiencies very close to the theoretical limit are demonstrated in this work. On the other hand, microchip solid state lasers passively Q-switched with several saturable absorbers are also presented. For this purpose, novel nanomaterials such as MoS2, carbon nanostructures (SWCNTs, single- and multilayer graphene) and a SESA are used as saturable absorbers. Besides, the most conventional Cr:YAG (~1.06 μm) and Cr:ZnS (~1.9 μm) are examined to compare their performance.
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Kifle, Esrom Aschenaki. "Fabrication and characterization of waveguide lasers operating in the infrared spectral range." Doctoral thesis, Universitat Rovira i Virgili, 2019. http://hdl.handle.net/10803/668351.

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Aquest treball de tesi ha tractat la fabricació i la caracterització de làsers de guia d’ona compactes i eficients que funcionen en règims d’ona contínua i Q-commutat de forma passiva al voltant dels 2 micròmetres en l’espectre electromagnètic. Per aconseguir-los, es van utilitzar materials cristal•lins basats en tungstats dobles d’estructura monoclínica dopats amb erbi (Er3+), tuli (Tm3+) o holmi (Ho3+). Aquests materials làser es van escollir per les seves propietats òptiques d’emissió i absorció que els fan aptes per aconseguir dispositius compactes. Per a la fabricació i l'estructuració de les guies d'ona, es va utilitzar la combinació dels següents mètodes: creixement cristal•lí en solució a alta temperatura, creixement d’epitàxies en fase líquida, tall amb serra micromètrica de diamant i escriptura directa per làser de femtosegons. A més, es van implementar diferents tècniques de caracterització com la microscòpia confocal, μ-Raman i μ-luminescència per avaluar la qualitat i la idoneïtat de les guies d'ones. En el règim d’ona Q-commutat de forma passiva, es va estudiar la idoneïtat de diferents absorbidors saturables, com ara cristalls de ZnSe o ZnS dopats amb Cr2+, MoS2 i nanoestructures de carboni (grafè i els nanotubs de carboni) dipositats sobre un substrat transparent o directament a la superfície de la mostra que contenia les guies d'ones. La fabricació d’una guia d’ona acanalada superficial mitjançant creixement epitaxial va donar com a resultat una eficiència làser rècord gairebé aproximada al límit teòric. Es van fabricar i estudiar guies d'ones soterrades (canals) fabricades mitjançant un làser de femtosegon. Igualment, es van fabricar i estudiar guies d'ona acanalades en superfície (forma d'anell) i separadors en forma de Y. Finalment, es van demostrar làsers de guia d’ona capaços d’oferir una potència de sortida de nivell de watts, així com làsers de guia d’ona en règim Q-commutat de forma passiva molt estable.
Este trabajo de tesis ha tratado la fabricación y caracterización de láseres de guía de onda compactos y eficientes que funcionan en los regímenes de onda continua y Q-conmutado de forma pasiva alrededor de los 2 micrómetros en el espectro electromagnético. Para lograrlos, se emplearon materiales cristalinos basados en tungstatos dobles de estructura monoclínica dopados con erbio (Er3+), tulio (Tm3+) u holmio (Ho3+). Los medios de ganancia fueron elegidos debido a sus propiedades ópticas de emisión y absorción que los hacen adecuados para lograr dispositivos compactos. Para la fabricación y estructuración de las guías de onda se utilizó una combinación de los métodos: crecimiento cristalino en solución a alta temperatura, crecimiento epitaxial en fase líquida, corte con sierra micrométrica de diamante y escritura directa por láser de femtosegundo. Además, se implementaron diferentes técnicas de caracterización, como la microscopía confocal, μ-Raman y μ-luminiscencia para evaluar la calidad y la idoneidad de las guías de onda. En el régimen de operación Q-conmutado pasivo, se estudió la idoneidad de diferentes absorbentes saturables, como los cristales de ZnSe o ZnS dopados con Cr:2+, el MoS2 y las nanoestructuras de carbono (grafeno y los nanotubos de carbono) depositados sobre un sustrato transparente o directamente sobre la superficie de la muestra que contiene las guías de onda. La fabricación de una guía de onda acanalada superficial mediante crecimiento epitaxial resultó en una eficiencia láser récord muy próximo al límite teórico. Se fabricaron y estudiaron guías de onda enterradas fabricadas mediante escritura con láser de femtosegundo. Se fabricaron y estudiaron guías de onda acanaladas en superficie (revestimiento en forma de anillo) y divisores en forma de Y. Finalmente, se demostraron láseres de guía de onda capaces de generar una potencia de salida de vatios, así como láseres de guía de onda en régimen Q-conmutado pasivamente muy estable.
This thesis work has dealt with the fabrication and the characterization of compact and efficient waveguide lasers operating in the continuous wave and passively Q-switched operation regimes around 2 μm in the spectral range. To achieve those, erbium (Er3+), thulium (Tm3+) or holmium (Ho3+) doped monoclinic double tungstate crystalline materials were employed. The gain media were chosen due to their ability to generate polarized laser emission and their large gain cross-sections which make them suitable for achieving compact devices. The combination of the top-seeded solution growth, liquid phase epitaxy, diamond saw dicing and femtosecond direct laser writing methods were employed for fabricating and structuring the waveguides. Furthermore, different characterization techniques such as confocal microscopy, μ-Raman, and μ-luminescence mapping were implemented to assess the quality and suitability of the fabricated waveguides for lasing application. In the passively Q-switched operation regime, the suitability of different saturable absorbers such as transition-metal-doped chalcogenide crystals (Cr2+:ZnSe or ZnS), few-layer transition metal dichalcogenide (MoS2) and carbon nanostructures such as graphene and single-walled carbon nanotubes deposited on a transparent substrate or directly onto the surface of the sample containing the waveguides were tested. The fabrication of an epitaxially grown surface channel waveguide resulted in a record slope efficiency almost approaching the theoretical limit. Femtosecond laser written buried channel waveguides (with circular and hexagonal optical-lattice-like cladding), surface channel waveguides (with half-ring-shaped cladding) and Y-branch splitters were fabricated and studied. Waveguide lasers capable of delivering a watt-level output power as well as those with a stable passive Q-switching operation were demonstrated.
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Books on the topic "Lasers"

1

Ball, Kay. Lasers: The perioperative challenge. 3rd ed. Denver, CO: Acorn, 2004.

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Beach, David P. Applications of lasers and laser systems. Englewood Cliffs, N.J: PTR Prentice Hall, 1993.

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Jentink, Hendrik Willem. Laser doppler velocimetry using diode lasers. [s.l.]: [s.n.], 1989.

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H, Piepmeier Edward, ed. Analytical applications of lasers. New York: Wiley, 1986.

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Engineers, Society of Manufacturing, ed. Industrial lasers. Dearborn, Mich: Society of Manufacturing Engineers, Publications Development Dept., 1986.

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Eichler, Hans Joachim, Jürgen Eichler, and Oliver Lux. Lasers. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99895-4.

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Thyagarajan, K., and Ajoy Ghatak. Lasers. Boston, MA: Springer US, 2011. http://dx.doi.org/10.1007/978-1-4419-6442-7.

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Diels, Jean-Claude, and Ladan Arissian. Lasers. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527640034.

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Boekhoff, P. M. Lasers. San Diego, CA: Kidhaven Press, 2002.

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Nardo, Don. Lasers. San Diego Calif: Lucent Books, 2003.

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Book chapters on the topic "Lasers"

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Kneubühl, Fritz Kurt, and Markus Werner Sigrist. "Chemische Laser (chemical lasers)." In Laser, 380–84. Wiesbaden: Vieweg+Teubner Verlag, 1999. http://dx.doi.org/10.1007/978-3-322-93875-6_17.

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Kneubühl, Fritz Kurt, and Markus Werner Sigrist. "Chemische laser (chemical lasers)." In Laser, 386–90. Wiesbaden: Vieweg+Teubner Verlag, 1989. http://dx.doi.org/10.1007/978-3-322-91806-2_17.

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Sigrist, Markus Werner. "Chemische Laser (chemical lasers)." In Laser: Theorie, Typen und Anwendungen, 399–402. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-57515-4_17.

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Kneubühl, Fritz Kurt, and Markus Werner Sigrist. "Chemische Laser (chemical lasers)." In Teubner Studienbücher Physik, 380–84. Wiesbaden: Vieweg+Teubner Verlag, 2005. http://dx.doi.org/10.1007/978-3-322-99688-6_17.

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Thyagarajan, K., and Ajoy Ghatak. "Introduction." In Lasers, 3–8. Boston, MA: Springer US, 2010. http://dx.doi.org/10.1007/978-1-4419-6442-7_1.

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Thyagarajan, K., and Ajoy Ghatak. "Properties of Lasers." In Lasers, 263–75. Boston, MA: Springer US, 2010. http://dx.doi.org/10.1007/978-1-4419-6442-7_10.

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Thyagarajan, K., and Ajoy Ghatak. "Some Laser Systems." In Lasers, 277–89. Boston, MA: Springer US, 2010. http://dx.doi.org/10.1007/978-1-4419-6442-7_11.

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Thyagarajan, K., and Ajoy Ghatak. "Doped Fiber Amplifiers and Lasers." In Lasers, 291–321. Boston, MA: Springer US, 2010. http://dx.doi.org/10.1007/978-1-4419-6442-7_12.

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Thyagarajan, K., and Ajoy Ghatak. "Semiconductor Lasers." In Lasers, 323–62. Boston, MA: Springer US, 2010. http://dx.doi.org/10.1007/978-1-4419-6442-7_13.

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Thyagarajan, K., and Ajoy Ghatak. "Optical Parametric Oscillators." In Lasers, 363–85. Boston, MA: Springer US, 2010. http://dx.doi.org/10.1007/978-1-4419-6442-7_14.

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Conference papers on the topic "Lasers"

1

Takei, N., T. Mori, F. Kannari, S. Yamaguchi, H. Hara, and S. V. Krayushkin. "Properties of 20-Hz eye-safe cascade Raman laser with Ba(NO3)2 crystal." In Solid State Lasers: Materials and Applications. Washington, D.C.: Optica Publishing Group, 1997. http://dx.doi.org/10.1364/sslma.1997.wa4.

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Recently, lasers operating in the eye-safe wavelength around 1.5 μm have found increasing demand in the laser radar (LIDAR). Raman laser pumped by well established lasers such as Nd:YAG lasers is a favorable candidate with such characteristics at high repetition rate, narrow linewidth, and good beam quality.1 As the Raman conversion medium, a Ba(NO3)2 crystal has attracted much attention because of its high gain and strong mechanical properties.2 Laser output in the eye-safe wavelength region can be obtained with the Ba(NO3)2 crystal either in a first Stokes line pumped by 1.3 μm Nd:YAG laser2, or in a third Stokes line pumped by 1.06 μm Nd:YAG laser3. When the Raman crystal exhibits substantial residual absorption in the pump or Stokes wavelength, these solid-state Raman lasers require some thermal management to scale up to high average power systems such as in LIDAR. Hence, we experimentally studied the thermal characteristics of the Ba(NO3)2 cascade Raman conversion process.
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Wang, Tao, Gian Piero Puccioni, and Gian Luca Lippi. "Threshold dynamics in meso- and nanoscale lasers: why Vertical Cavity Surface Emitting Lasers?" In Semiconductor Lasers and Laser Dynamics, edited by Krassimir Panajotov, Marc Sciamanna, and Rainer Michalzik. SPIE, 2018. http://dx.doi.org/10.1117/12.2303603.

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Harter, D. J., Y. B. Band, H. Samelson, and E. P. Ippen. "Stabilization and Passive Mode Locking of CW Alexandrite Lasers." In Instabilities and Dynamics of Lasers and Nonlinear Optical Systems. Washington, D.C.: Optica Publishing Group, 1985. http://dx.doi.org/10.1364/idlnos.1985.fc3.

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Alexandrite is a solid state laser material which lases in the range of 700-800 nm. Alexandrite has been lased continuously by pumping with a krypton ion laser1 and by pumping with xenon and mercury arc lamps2. When alexandrite is pumped with the krypton ion laser, the output is very stable and, when the pump source is removed, the output damps through population oscillations which can be well described by rate equations3. However, when alexandrite is pumped by the xenon or mercury arc lamps, the output is very noisy at certain pumping levels. Experimental data showing this noisy operation will be presented and sources of this noise will be discussed.
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LaCourse, Joanne, W. Rideout, W. Sharfin, and M. Vassell. "Ultimate bandwidth limitations of quantum well lasers." In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.tuhh1.

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Most high frequency quantum well lasers reported so far have been limited either by insufficient power or by electrical parasitics, but this paper addresses the ultimate bandwidth limit, set by damping due to gain suppression: f max = 8 π l k , where k = Γ/fO2, where fO is the resonance frequency, and where Γ is the damping rate. This limit is ~30 GHz for bulk lasers but is highly variable for quantum well lasers. Estimated values range from 4 GHz (for 1-μm strained SQW lasers1) to 70 GHz (for 1.5μm strained MQW lasers2). Clearly it is important to understand the cause of this damping, not only for fundamental principles but also to guide the optimization of high frequency quantum well lasers.
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Lindemann, Markus, Rainer Michalzik, Nils C. Gerhardt, Tobias Pusch, and Martin R. Hofmann. "Spin lasers for optical data communication." In Semiconductor Lasers and Laser Dynamics, edited by Krassimir Panajotov, Marc Sciamanna, and Rainer Michalzik. SPIE, 2018. http://dx.doi.org/10.1117/12.2306464.

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Wang, Qi Jie, Guozhen Liang, and Yongquan Zeng. "Integrated 2D materials and metasurfaces for multifunctional semiconductor lasers in Terahertz (Conference Presentation)." In Semiconductor Lasers and Laser Dynamics, edited by Krassimir Panajotov, Marc Sciamanna, and Rainer Michalzik. SPIE, 2018. http://dx.doi.org/10.1117/12.2313527.

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Yacomotti, Alejandro M. "Bifurcations in coupled nanolasers (Conference Presentation)." In Semiconductor Lasers and Laser Dynamics, edited by Krassimir Panajotov, Marc Sciamanna, and Rainer Michalzik. SPIE, 2018. http://dx.doi.org/10.1117/12.2314458.

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Grillot, Frédéric, Dieter Bimberg, Fan-Yi Lin, Heming Huang, Lyu-Chih Lin, Chih-Ying Chen, and Dejan Arsenijevic. "Recent advances in InAs/GaAs quantum dot lasers with short optical feedback." In Semiconductor Lasers and Laser Dynamics, edited by Krassimir Panajotov, Marc Sciamanna, and Rainer Michalzik. SPIE, 2018. http://dx.doi.org/10.1117/12.2314708.

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Mi, Qinggai, Xubao Wang, and Rongshi Xiao. "300mm focal length optical system design for direct high power laser diodes stack." In Semiconductor Lasers and Laser Dynamics, edited by Krassimir Panajotov, Marc Sciamanna, and Rainer Michalzik. SPIE, 2018. http://dx.doi.org/10.1117/12.2314718.

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Zia, Nouman, Jukka Viheriälä, Eero Koivusalo, Antti Aho, Soile Suomalainen, and Mircea Guina. "High power GaSb superluminescent diodes with broadband emission around 2.55 µm (Conference Presentation)." In Semiconductor Lasers and Laser Dynamics, edited by Krassimir Panajotov, Marc Sciamanna, and Rainer Michalzik. SPIE, 2018. http://dx.doi.org/10.1117/12.2314876.

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Reports on the topic "Lasers"

1

NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA. Laser Diode Pumped Solid State Lasers. Fort Belvoir, VA: Defense Technical Information Center, January 1987. http://dx.doi.org/10.21236/ada251815.

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Schepler, Kenneth L. Exploratory Lasers. Fort Belvoir, VA: Defense Technical Information Center, January 1995. http://dx.doi.org/10.21236/ada296668.

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Meystre, Pierre, and Poul Jessen. Atom Lasers. Fort Belvoir, VA: Defense Technical Information Center, July 2000. http://dx.doi.org/10.21236/ada384428.

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Dunn, J., A. L. Osterheld, J. R. Hunter, and V. N. Shlyaptsev. Development of short pulse laser pumped x-ray lasers. Office of Scientific and Technical Information (OSTI), February 2000. http://dx.doi.org/10.2172/15005094.

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Deri, R. Semiconductor Laser Diode Pumps for Inertial Fusion Energy Lasers. Office of Scientific and Technical Information (OSTI), January 2011. http://dx.doi.org/10.2172/1018822.

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Piperaki, K., A. Stasinopoulos, D. Anglos, S. H. Anastasiadis, and E. P. Giannelis. Nanocomposite Random Lasers. Fort Belvoir, VA: Defense Technical Information Center, November 2002. http://dx.doi.org/10.21236/ada408870.

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Gmachl, Claire. Quantum Cascade Lasers. Fort Belvoir, VA: Defense Technical Information Center, January 2005. http://dx.doi.org/10.21236/ada429769.

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Eden, J. G., and B. D. Guenther. Tunable Molecular Lasers. Fort Belvoir, VA: Defense Technical Information Center, September 1986. http://dx.doi.org/10.21236/ada175450.

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Jingwen, Sun. Laser Guide Stars: Bridge of Ground-based Lasers Entering Space. Fort Belvoir, VA: Defense Technical Information Center, September 1992. http://dx.doi.org/10.21236/ada256649.

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Shirley, Lyle G., and Gregory R. Hallerman. Applications of Tunable Lasers to Laser Radar and 3D Imaging. Fort Belvoir, VA: Defense Technical Information Center, February 1996. http://dx.doi.org/10.21236/ada306557.

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