Download or read book Continuous Wave Optically Pumped Laser Design written by Gaylord Gene Olson and published by . This book was released on 1963 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optically Pumped Continuous Wave CF4 Laser written by Menno Hartemink and published by . This book was released on 1991 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optimization of Broad area GaAs Diode Lasers for High Powers and High Efficiencies in the Temperature Range 200 220 K written by Frevert Carlo and published by . This book was released on 2019-07-11 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work focuses on the development of AlGaAs-based diode laser (DL) bars optimized for reaching highest powers and efficiencies at low operation temperatures. Specifically, the quasi continuous wave (QCW) pumping of cryogenically cooled Yb: YAG solid-state lasers is targeted, setting requirements on the wavelength (940 nm), the pulse conditions (pulse length 1.2 ms) and frequency (10 Hz) as well as the lowest DL operating temperature THS 200 K, consistent with economic cooling. High fill-factor bars for QCW operation are to reach high optical performance with optical output powers of P 1.5 kW and power conversion efficiencies of ŋE 60% at these power levels. Understanding the efficiency-limiting factors and the behavior at lower temperatures is necessary to design these devices. Optimizations are performed iteratively in three stages. First, vertical epitaxial designs are studied theoretically, adjusted to the targeted operation temperatures and specific laser parameters are extracted. Secondly, resulting vertical designs are processed into low power single emitters and their electro-optical behavior at low currents is experimentally assessed over a wide range of temperatures. The obtained laser parameters characteristic to the vertical design are then used to extrapolate the laser's performance up to the high targeted currents. Finally, vertical designs promising to reach the targeted values for power and efficiency are processed into high power single emitters and bars which are measured up to the highest currents. Eventually, laser bars are fabricated reaching output powers of 2 kW and efficiencies of 61% at 1.5 kW at an operation temperature of 203 K.
Download or read book Introduction to Laser Diode pumped Solid State Lasers written by Richard Scheps and published by SPIE-International Society for Optical Engineering. This book was released on 2002 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text covers a wide range of material, from the basics of laser resonators to advanced topics in laser diode pumping. The subject matter is presented in descriptive terms that are understandable by the technical professional who does not have a strong foundation in fundamental laser topics.
Download or read book Lasers and Masers a Continuing Bibliography written by United States. National Aeronautics and Space Administration and published by . This book was released on 1965 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lasers and Masers written by and published by . This book was released on 1962 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Widegap II VI Compounds for Opto Electronic Applications written by H.E. Rúda and published by Springer Science & Business Media. This book was released on 1992-01-31 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is intended for readers desiring a comprehensive analysis of the latest developments in widegap II-VI materials research for opto-electronic applications and basic insight into the fundamental underlying principles. Therefore, it is hoped that this book will serve two purposes. Firstly, to educate newcomers to this exciting area of physics and technology and, secondly, to provide specialists with useful references and new insights in related areas of II-VI materials research. The motivation for preparing this book originated from the need for a current review of this fertile and important field. A primary goal of this book is therefore to present an eclectic synthesis of these sometimes diverse fields of investigation. This book consists of three main sections, namely (1) Growth and Properties, (2) Materials Characterization and (3) Devices. Part One presents an overall perspective of the state of the art in the preparation of the widegap II-VI materials. Part Two concentrates on current topics pertinent to the characterization of these materials from the unique perspective of each of the authors. Part Three focuses on advances in the opto-electronic applications of these materials. The material in this section runs the gamut from addressing recent advances in device areas which date back to some of the earliest reported research in these materials, to tackling some quite new and exciting future directions.
Download or read book High Energy Molecular Lasers written by V. V. Apollonov and published by Springer. This book was released on 2016-08-08 with total page 445 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book displays the physics and design of high-power molecular lasers. The lasers described are self-controlled volume-discharge lasers. The book explains self-sustained discharge lasers, self-initiated discharge lasers and technical approaches to laser design. Important topics discussed are laser efficiency, laser beam quality and electric field homogeneity. The book contains many new innovative applications.
Download or read book The Laser Guidebook written by Jeff Hecht and published by McGraw Hill Professional. This book was released on 1999-09-22 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt: New edition of a reference and tutorial introduction to the practical aspects of lasers--the functional characteristics vital to those who work with them. A few chapters describe basic principles; subsequent chapters are devoted to the various kinds of lasers, e.g. helium-neon, noble gas, helium-cadmium, carbon dioxide, chemical, copper and gold vapor, excimer, nitrogen, and others. Annotation copyright by Book News, Inc., Portland, OR
Download or read book Epitaxial Design Optimizations for Increased Efficiency in GaAs Based High Power Diode Lasers written by Thorben Kaul and published by Cuvillier Verlag. This book was released on 2021-04-09 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents progress in the root-cause analysis of power saturation mechanisms in continuous wave (CW) driven GaAs-based high-power broad area diode lasers operated at 935 nm. Target is to increase efficiency at high optical CW powers by epitaxial design. The novel extreme triple asymmetric (ETAS) design was developed and patented within this work to equip diode lasers that use an extremely thin p-waveguide with a high modal gain. An iterative variation of diode lasers employing ETAS designs was used to experimentally clarify the impact of modal gain on the temperature dependence of internal differential quantum efficiency (IDQE) and optical loss. High modal gain leads to increased free carrier absorption from the active region. However, less power saturation is observed, which must then be attributed to an improved temperature sensitivity of the IDQE. The effect of longitudinal spatial hole burning (LSHB) leads to above average non-linear carrier loss at the back facet of the device. At high CW currents the junction temperature rises. Therefore, not only the asymmetry of the carrier profile increases but also the average carrier density in order to compensate for the decreased material gain and increased threshold gain. This carrier non-pinning effect above threshold is found in this work to enhance the impact of LSHB already at low currents, leading to rapid degradation of IDQE with temperature. This finding puts LSHB into a new context for CW-driven devices as it emphasizes the importance of low carrier densities at threshold. The carrier density was effectively reduced by applying the novel ETAS design. This enabled diode lasers to be realized that show minimized degradation of IDQE with temperature and therefore improved performance in CW operation.
Download or read book Designing Subwavelength structured Light Sources written by Song Liang Chua and published by . This book was released on 2013 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The laser has long been established as the best possible optical source for fundamental studies and applications requiring high field intensity, single mode operation, a high degree of coherence, a narrow linewidth and short pulses. There are many applications that require lasers of varying frequencies, powers, and far-field properties. In science, the laser is a useful source in spectroscopy and microscopy, for investigating nonlinear optics phenomena and nuclear fusion. More commonly, we find them in barcode readers, laser pointers, and printers. They are also widely used for military, medical, and industrial applications. This thesis is focused on achieving new understanding of the principles and phenomena involved in the interaction of light with a variety of material systems, which will in turn guide the designs of compact lasers with feedback structures having features at the subwavelength-scale. The thesis begins by describing the interaction of light with an arbitrary complex material system, and implementing them into the electromagnetic model using two different theoretical techniques suitable for analyzing microstructured lasers: exact finite-difference time-domain calculations and a semi-analytic coupled-mode formalism. These methods are first applied to analyze lasing action in the photonic crystal (PhC) slabs. This class of lasers, commonly referred to as the photonic crystal surface-emitting lasers (PCSELs), can be integrated on-chip and is essentially the two-dimensional (2D) versions of the second-order distributed feedback lasers, where the higher quality factor lasing mode (dark Fano resonance) is selected through the symmetry mismatch to the free-space modes. The PCSELs have not only achieved the highest surface-emitting single-mode power but also the ability to control the shapes, polarizations and directions of their far-fields. However, as in all laser cavities, the lasing areas of PCSELs are limited by two fundamental constraints; a large area tends to promote both multi-mode and multi-area lasing. We propose to overcome both constraints to achieve single-mode PCSELs of larger areas, and thus higher output powers, by tuning the regular lasing bandedges of quadratic dispersions in typical PCSELs to form a single accidental Dirac cone of linear dispersion at the Brillouin zone center. Moreover, an additional frequency-locking phenomenon at the accidental point, with potentially high density of states, is analyzed. We demonstrate and distinguish experimentally the existence of the dark Fano resonances in a macroscopic 2D silicon nitride PhC slab consisting of a square array of holes. We characterize the passive PhC slab in terms of its resonant frequencies and radiation behaviors using temporal coupled-mode theory and symmetry considerations. We also realize lasing at a dark Fano resonance with diluted solutions of R6G molecules as the gain medium. Next, we turn our attention to the organic dye lasers whose high tunability in the visible wavelengths has attracted interests for many years due to their low-cost processing, flexible choice of substrates, and large emission cross sections that can cover the spectral region from ultraviolet to the near infrared. We investigate the laser dynamics in systems of sub-wavelength photonic structures consisting of organic dye molecules, including their photobleaching effects. Our analysis considers both the chemical properties of the dyes and optical properties of the cavities. We also systematically studied the feasibility of lasing under continuous-wave excitations in optically pumped monolithic organic dye lasers. This study suggests routes to realize an organic laser that can potentially lase with a threshold of only a few W/cm2 Lastly, we investigate far-infrared (FIR) (~ 0.2 - 2 THz) laser emission from optically-pumped rotationally excited molecular gases confined in a metallic cavity. Terahertz radiation has already been used in packaging inspection for quality control, chemical composition analysis, and security screening. Submillimeter spatial resolution imaging and incredibly specific molecular recognition are other compelling uses for terahertz radiation. To apply terahertz radiation beyond laboratory or close range ( 10 m) applications, more powerful ( 100 mW) and efficient sources are required to see through highly attenuating obscurants (including the atmosphere). The fundamental limitations in the performances of FIR molecular gas lasers reside in the molecular gas physics due to the so-called vibrational bottleneck. We seek to overcome the resulting challenges through novel optical designs of the feedback structures. To undertake this task, we generalize previous works to allow for a realistic description of the spatio-temporal dynamics characterizing the molecular collisional and diffusion processes. This work expands the current understanding of lasing action in FIR gas lasers and, thus, could contribute to the development of a new class of terahertz sources able to operate efficiently at room temperature. The advent of quantum cascade lasers to replace CO2 pump lasers may combine to produce truly compact submillimeter-wave laser sources in the near future.
Download or read book Tunable Laser Applications written by F.J. Duarte and published by CRC Press. This book was released on 2008-08-26 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: Tunability has added an important dimension to a variety of laser devices and led to new systems and applications. From laser spectroscopy to Bose-Einstein condensation, the one nexus is the tunable laser. Incorporating nine new chapters since the first edition, Tunable Laser Applications, Second Edition reflects the significant developments
Download or read book Applied Nanophotonics written by Hilmi Volkan Demir and published by Cambridge University Press. This book was released on 2018-11-22 with total page 453 pages. Available in PDF, EPUB and Kindle. Book excerpt: An accessible yet rigorous introduction to nanophotonics, covering basic principles, technology, and applications in lighting, lasers, and photovoltaics. Providing a wealth of information on materials and devices, and over 150 color figures, it is the 'go-to' guide for students in electrical engineering taking courses in nanophotonics.
Download or read book DWDM System Components written by and published by Information Gatekeepers Inc. This book was released on with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Laser Technology and Applications written by Colin Webb and published by CRC Press. This book was released on 2020-09-29 with total page 1266 pages. Available in PDF, EPUB and Kindle. Book excerpt: The invention of the laser was one of the towering achievements of the twentieth century. At the opening of the twenty-first century we are witnessing the burgeoning of the myriad technical innovations to which that invention has led. The Handbook of Laser Technology and Applications is a practical and long-lasting reference source for scientists and engineers who work with lasers. The Handbook provides, a comprehensive guide to the current status of lasers and laser systems; it is accessible to science or engineering graduates needing no more than standard undergraduate knowledge of optics. Whilst being a self-contained reference work, the Handbook provides extensive references to contemporary work, and is a basis for studying the professional journal literature on the subject. It covers applications through detailed case studies, and is therefore well suited to readers who wish to use it to solve specific problems of their own. The first of the three volumes comprises an introduction to the basic scientific principles of lasers, laser beams and non-linear optics. The second volume describes the mechanisms and operating characteristics of specific types of laser including crystalline solid - state lasers, semiconductor diode lasers, fibre lasers, gas lasers, chemical lasers, dye lasers and many others as well as detailing the optical and electronic components which tailor the laser's performance and beam delivery systems. The third volume is devoted to case studies of applications in a wide range of subjects including materials processing, optical measurement techniques, medicine, telecommunications, data storage, spectroscopy, earth sciences and astronomy, and plasma fusion research. This vast compendium of knowledge on laser science and technology is the work of over 130 international experts, many of whom are recognised as the world leaders in their respective fields. Whether the reader is engaged in the science, technology, industrial or medical applications of lasers or is researching the subject as a manager or investor in technical enterprises they cannot fail to be informed and enlightened by the wide range of information the Handbook supplies.
Download or read book Lasers and Masers A Continuing Bibliography with Indexes written by and published by . This book was released on 1967 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Optimal Design of Optically Pumped Lasers written by Richard John Koshel and published by . This book was released on 1996 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:
