Download or read book Mode Locked Frequency Doubled Neodymium Laser written by J. H. Boyden and published by . This book was released on 1970 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: Investigations were conducted in the areas of second harmonic generation and mode locking with CW neodymium:YAG Lasers. Demonstration of consistent and reproducible 100% conversion of the available CW power at 1.06 microns into 0.53 micron power was accomplished at a level of 2.1 watts in the TEM(oo) mode. A completely electronic closed loop automatically stabilized mode-locking system was developed, with capability of tracking plus or minus 1.5% variations in cavity length. Experimental and theoretical investigations of combined mode locking and intracavity second harmonic generation using a common Ba2NaNb5O15 crystal showed that there was a strong interaction between the processes, the nonlinear harmonic generation having a serious effect on mode-locking effectiveness. Thermal effects due to absorption in the nonlinear crystal were shown to have a significant effect on second harmonic generation. Correlation between theory and experiment was obtained. (Author).
Download or read book Frequency Doubled Neodymium Laser written by J. E. Murray and published by . This book was released on 1972 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of an experimental program designed to produce the maximum, stable second harmonic power from a mode-locked Nd:YAG laser using external second harmonic generation are reported. The laser was operated C.W. at the 2 to 3 watt level in a TEM transverse mode, and mode locked at 500 MHz. The major results were: Up to 400 mw of second harmonic power with a conversion efficiency of 15% was generated and demonstrated to be stable (less than 10% drift) over testing periods of 15 minutes or greater. A maximum of 550 mw of second harmonic was generated at 16% efficiency but at this level the system was stable for only a few minutes.
Download or read book Frequency Doubled Mode Locked Nd YAG Laser written by Arnold R. Clobes and published by . This book was released on 1972 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the work reported herein is to achieve stable mode-locked, second harmonic power output from a Nd:YAG laser. Particular emphasis is placed on amplitude stability and on conversion efficiency. The experimental results of this program are 200 mW of 0.53 micron mode-locked power output at a PRF of 500 MHz. The amplitude fluctuations are + or - 4%. The intracavity barium sodium niobate crystal, used as both the second harmonic generator and mode-lock modulator, was driven at 250 MHz. Stability control techniques successfully demonstrated include: (1) cladding of the laser rod; (2) amplitude equalization of the output pulse train; (3) maintaining the relative frequency difference between the modulator drive and the cavity c/2L frequency within narrow limits by use of a phase-lock loop; (4) series regulation of the lamp current and the use of ballast resistors; and (5) maintaining the nonlinear crystal at the phase-match temperature by closed-loop control of the oven temperature. Thermal effects in the banana crystal arising from absorption of the fundamental wavelength radiation were found to limit the amplitude stability of the laser output. The same effects distort the 0.53 micron far-field beam profile and reduce the conversion efficiency.
Download or read book Harmonic Mode Locking of the Nd YAG Laser written by Stanford University. Microwave Laboratory and published by . This book was released on 1972 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Frequency Doubled Single Frequency Neodymium YAG Laser written by William Culshaw and published by . This book was released on 1973 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report deals with the theoretical and experimental work done on the basic techniques and successful operation of a stable, frequency-doubled, single-frequency Nd:YAG laser. An efficient, resonant cavity design with the Nd: YAG rod acting as an internal focusing element was used to attain adequate TEM sub 00 mode volumes in the laser rod and the small beam waists at the nonlinear crystal (Ba2NaNb5O15) necessary for optimum intracavity second-harmonic generation. Various mode filters were investigated, resulting in the use of a double, intracavity Fabry-Perot etalon arrangement to obtain single-frequency operation of the Nd:YAGlaser with relative ease. Mode competition effects were studied, and the necessary conditions for stable single-frequency operation at both 1.06 and 0.53 micrometers were established. Techniques and component designs were successfully developed to obtain all the frequency-doubled output in a single direction. These included appropriate cavity geometries and the design of doubly reflecting laser mirrors for both 1.06 and 0.53 micrometers including phase considerations, and also the development of AR coatings on Ba2NaNb5O15 effective at both wavelengths. The adequacy of the techniques adopted was demonstrated, and a unidirectional, single-frequency, frequency-doubled power output of 0.35 W obtained consistently from a 5 by 50 mm Nd:YAG rod pumped by a tungsten-iodine lamp operated at approx 850 W in a spherical pump cavity.
Download or read book Lasers for Medical Applications written by Helena Jelínková and published by Elsevier. This book was released on 2013-09-30 with total page 827 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lasers have a wide and growing range of applications in medicine. Lasers for Medical Applications summarises the wealth of recent research on the principles, technologies and application of lasers in diagnostics, therapy and surgery. Part one gives an overview of the use of lasers in medicine, key principles of lasers and radiation interactions with tissue. To understand the wide diversity and therefore the large possible choice of these devices for a specific diagnosis or treatment, the respective types of the laser (solid state, gas, dye, and semiconductor) are reviewed in part two. Part three describes diagnostic laser methods, for example optical coherence tomography, spectroscopy, optical biopsy, and time-resolved fluorescence polarization spectroscopy. Those methods help doctors to refine the scope of involvement of the particular body part or, for example, to specify the extent of a tumor. Part four concentrates on the therapeutic applications of laser radiation in particular branches of medicine, including ophthalmology, dermatology, cardiology, urology, gynecology, otorhinolaryngology (ORL), neurology, dentistry, orthopaedic surgery and cancer therapy, as well as laser coatings of implants. The final chapter includes the safety precautions with which the staff working with laser instruments must be familiar. With its distinguished editor and international team of contributors, this important book summarizes international achievements in the field of laser applications in medicine in the past 50 years. It provides a valuable contribution to laser medicine by outstanding experts in medicine and engineering. Describes the interaction of laser light with tissue Reviews every type of laser used in medicine: solid state, gas, dye and semiconductor Describes the use of lasers for diagnostics
Download or read book Solid State Laser Engineering written by Walter Koechner and published by Springer. This book was released on 2007-11-06 with total page 765 pages. Available in PDF, EPUB and Kindle. Book excerpt: Written from an industrial perspective this book discusses in detail the characteristics, design, construction, and performance of solid-state lasers. Emphasis is placed on engineering and practical considerations; phenomenological aspects using models are preferred to abstract mathematical derivations. Since its first edition almost 30 years ago this book has become the standard in the field of solid-state lasers for scientists, engineers and graduate students. This edition has been extensively revised and updated to account for recent developments in the areas of diode-laser pumping, laser materials and nonlinear crystals, and entire new sections have been added.
Download or read book Fundamentals and Basic Optical Instruments written by Daniel Malacara Hernández and published by CRC Press. This book was released on 2017-11-22 with total page 467 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamentals and Basic Optical Instruments includes thirteen chapters providing an introductory guide to the basics of optical engineering, instrumentation, and design. Topics include basic geometric optics, basic wave optics, and basic photon and quantum optics. Paraxial ray tracing, aberrations and optical design, and prisms and refractive optical components are included. Polarization and polarizing optical devices are covered, as well as optical instruments such as telescopes, microscopes, and spectrometers.
Download or read book Principles of Fluorescence Spectroscopy written by Joseph R. Lakowicz and published by Springer Science & Business Media. This book was released on 2007-12-05 with total page 961 pages. Available in PDF, EPUB and Kindle. Book excerpt: The third edition of this established classic text reference builds upon the strengths of its very popular predecessors. Organized as a broadly useful textbook Principles of Fluorescence Spectroscopy, 3rd edition maintains its emphasis on basics, while updating the examples to include recent results from the scientific literature. The third edition includes new chapters on single molecule detection, fluorescence correlation spectroscopy, novel probes and radiative decay engineering. Includes a link to Springer Extras to download files reproducing all book artwork, for easy use in lecture slides. This is an essential volume for students, researchers, and industry professionals in biophysics, biochemistry, biotechnology, bioengineering, biology and medicine.
Download or read book Advances in Nd YAG Laser Surgery written by Stephen N. Joffe and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Nd:YAG laser has finally become the multidisciplinary and muitispeciaity tool of the 1980s. Primarily developed for gastrointestinal applications for controlling bleeding, at present it is also used for endoscopic treatment of gastrointestinal tumors, endobronchial cancer, and bladder and gynecological lesions and finding applications in otorhinolaryngology and neurosurgery. De velopment of laser scalpels and focusing head-pieces has now allowed the Nd:YAG laser to be used for open surgical procedures in general and plastic surgery, head and neck surgery, urology, gynecology, dermatology, and neu rosurgery. The rapid development in ceramic technology has led to contact surgery allowing physicians a choice of excision, vaporization, coagulation, incision, or combinations thereof by easily changing probes rather than having to select new laser wavelengths. This technology is rapidly replacing the carbon dioxide laser which currently has no adequate flexible waveguide for fiberoptic en doscopy, cannot be used in a water medium (e.g., bladder), and has poor coagulation properties when compared to the Nd:YAG laser. Future developments may see the Nd:YAG laser even replacing electro cautery in the operating room due to its greater safety and efficacy. Local hyperthermia (laserthermia) with computer control, photodynamic therapy, and ophthalmic applications make the Nd:YAG laser the most exciting tech nological advancement in medicine and surgery for the 1980s.
Download or read book Advanced Photonics with Second Order Optically Nonlinear Processes written by A.D. Boardman and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 491 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although it took some time to establish the word, photonics is both widely accepted and used throughout the world and a major area of activity concerns nonlinear materials. In these the nonlinearity mainly arises from second-order or third-order nonlinear optical processes. A restriction is that second-order processes only occur in media that do not possess a centre of symmetry. Optical fibres, on the other hand, being made of silica glass, created by fusing SiO molecules, are made of material with a centre of z symmetry, so the bulk of all processes are governed by third-order nonlinearity. Indeed, optical fibre nonlinearities have been extensively studied for the last thirty years and can be truly hailed as a success story of nonlinear optics. In fact, the fabrication ofsuch fibres, and the exploitation oftheir nonlinearity, is in an advanced stage - not least being their capacity to sustain envelope solitons. What then ofsecond-order nonlinearity? This is also well-known for its connection to second-harmonic generation. It is an immediate concern, however, to understand how waves can mix and conserve both energy and momentum ofthe photons involved. The problem is that the wave vectors cannot be made to match without a great deal of effort, or at least some clever arrangement has to be made - a special geometry, or crystal arrangement. The whole business is called phase matching and an inspection ofthe state-of-the-art today, reveals the subject to be in an advanced state.
Download or read book Photochemistry written by D. Bryce-Smith and published by Royal Society of Chemistry. This book was released on 1973 with total page 995 pages. Available in PDF, EPUB and Kindle. Book excerpt: The breadth of scientific and technological interests in the general topic of photochemistry is truly enormous and includes, for example, such diverse areas as microelectronics, atmospheric chemistry, organic synthesis, non-conventional photoimaging, photosynthesis, solar energy conversion, polymer technologies, and spectroscopy. This Specialist Periodical Report on Photochemistry aims to provide an annual review of photo-induced processes that have relevance to the above wide-ranging academic and commercial disciplines, and interests in chemistry, physics, biology and technology. In order to.
Download or read book Operational Characteristics of a Passively Mode locked Neodymium Fiber Laser written by Edwin C. Owen and published by . This book was released on 1997 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination Of Organic Structures By Physical Methods V6 written by F.C. Nachod and published by Elsevier. This book was released on 2012-12-02 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: Determination of Organic Structures by Physical Methods, Volume 6 is a six-chapter text that describes the refinements of some established physical methods for organic structure determination. The opening chapters examine the application of mass spectroscopy to amino acid sequencing of oligopeptides and the computerized organic structure retrieval. The following chapters discuss the historical developments, principles, instrumentation, and application of flash photolysis and 29Si nuclear magnetic resonance to structure determination. A chapter considers the relevant theory from which information on internuclear distances can be obtained and the steady-state measurements, transient methods, as well as the use of Fourier transform technique. This chapter also explores the application of nuclear overhauser effect measurements to structural and stereochemical problems. The concluding chapter deals with the liquid crystal structure determination using NMR spectroscopy. This work will be of value to organic and analytical chemists and researchers.
Download or read book ERDA Energy Research Abstracts written by and published by . This book was released on 1977 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1990 with total page 852 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Laser Technology and Applications written by Chunlei Guo and published by CRC Press. This book was released on 2021-05-10 with total page 1201 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive handbook gives a fully updated guide to lasers and laser technologies, including the complete range of their technical applications. The first volume outlines the fundamental components of lasers, their properties, and working principles. Key Features: • Offers a complete update of the original, bestselling work, including many brand-new chapters. • Deepens the introduction to fundamentals, from laser design and fabrication to host matrices for solid-state lasers, energy level diagrams, hosting materials, dopant energy levels, and lasers based on nonlinear effects. • Covers new laser types, including quantum cascade lasers, silicon-based lasers, titanium sapphire lasers, terahertz lasers, bismuth-doped fiber lasers, and diode-pumped alkali lasers. • Discusses the latest applications, e.g., lasers in microscopy, high-speed imaging, attosecond metrology, 3D printing, optical atomic clocks, time-resolved spectroscopy, polarization and profile measurements, pulse measurements, and laser-induced fluorescence detection. • Adds new sections on laser materials processing, laser spectroscopy, lasers in imaging, lasers in environmental sciences, and lasers in communications. This handbook is the ideal companion for scientists, engineers, and students working with lasers, including those in optics, electrical engineering, physics, chemistry, biomedicine, and other relevant areas.
