Download or read book Generating Picosecond Pulses from Q switched Microchip Lasers written by Alexander Craig Butler and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since their first demonstration in the 1960s, picosecond laser pulses have initiated and defined the area of ultrafast laser physics. Their ability to generate a burst of high-intensity, coherent light has opened up areas of science and enabled the observation of events that would otherwise remain out of the realm of human understanding. -- The particular mechanism commonly associated with picosecond pulse generation is mode-locking. These systems are typically complex, bulky and correspondingly expensive. A compact, cheap and robust option that produces comparable pulses would be of great value to the scientific and engineering communities. To this end, we examine the growing area of Q-switched microchip lasers: simple and compact devices that generate sub-nanosecond pulses by virtue of extremely reduced resonator cavity lengths. Incorporation of a passive Q-switch device, a semiconductor saturable absorber mirror or SESAM, enables truly minimal cavity lengths, and therefore minimal pulse durations, to be accessed. -- In this thesis we explore the limits of generating the shortest pulses from such microchip lasers. We develop a comprehensive numerical simulation model, based on the laser rate equations, to effectively model SESAM Q-switched microchip lasers. We incorporate additional phenomena such as two-photon absorption (TPA) in the Q-switch and SESAM etalons to derive a complete picture of the abilities of these micro-lasers. We show that TPA will increasingly affect the performance of these lasers, as shorter pulses are generated, and suspect that our model underestimates its effect on our experimental results. We examine the switching dynamics of the SESAM and describe the role of relaxation oscillations in the switching process, as well as demonstrating controlled partial switching. Scaling dependencies between laser component parameters and laser performance are drawn, providing guidelines for development of these lasers. We examine these relationships in experiment and verify the key relationship between short cavities and short pulses. We demonstrate a laser with record short pulses of 22 ps duration by extending the scaling of these lasers to the shortest demonstrated cavity length of 110 μm. -- To alleviate the low efficiency associated with lasers using thin gain media, we propose, model and develop an energy-scavenging amplification scheme. We demonstrate that a complete, amplified Q-switched microchip laser system has the potential to rival amplified mode-locked systems in generating few-picosecond, microjoule pulses, although practical validation of this will approach require careful laser engineering.
Download or read book Generating Picosecond Pulses from Q switched Microchip Laser written by Alexander Craig Butler and published by . This book was released on 2012 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High power Picosecond Pulse Generation from Q switched Diode Lasers written by Sheng-Hui Yang and published by . This book was released on 1996 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Voltage Picosecond Pulse Generation Utilizing Lasers written by R. Heintz and published by . This book was released on 1985 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: A mod-locked Q-switched Nd:YAG laser is used to generate a train of light pulses of approximately 70 picoseconds duration. The energy in these laser pulses are of the order of 2 milli-joules. The train of pulses are then passed through a switchout so that a single pulse is selected. This single pulse then strikes a chromium doped GaAs semiconductor switch which then conducts. If a high voltage supply is connected to one end of the switch and a load is connected to the other end, then the load will observe an electrical pulse which is half the amplitude of the d.c. voltage and of the order of 100-200 picosecond duration. The width of the electrical pulse is determined by the width of the laser pulse and of the characteristics of the transmission line over which the GaAs is mounted. (Author).
Download or read book Flexible Generation of Picosecond Laser Pulses in the Infrared and Green Spectral Range by Gain Switching of Semiconductor Lasers written by Sina Riecke and published by Cuvillier Verlag. This book was released on 2011-03-15 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Picosecond laser pulses find diverse applications for example in material processing as well as in analysis and sensing. Fluorescence lifetime spectroscopy in particular requires pulses with variable repetition rate and moderate pulse energy. While suitable pulses in the red and blue spectral range can be provided by gain-switched laser diodes, the generation of green laser pulses requires a more elaborate setup based on second harmonic generation. The starting point is a gain-switched infrared distributed-feedback laser diode. The optimization of the laser design and the operating conditions allows to generate spectrally narrow picosecond pulses with a peak power above 1 W. Different gain media are compared for further amplification of these pulses, and options for the miniaturization of the master-oscillator power-amplifier system are explored. The resulting intense infrared pulses are then used for second harmonic generation of green picoseconds pulses. Their peak power of above 5 W exceeds all previous green pulse sources with variable repetition rate. In terms of pulse energy and background suppression, the reported green pulses are thus ideally suited for fluorescence lifetime spectroscopy
Download or read book Tunable Picosecond Pulse Generation by an N2 Laser Pumped Self Q switched Distributed Feedback Dye Laser written by and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fiber Lasers written by Liang Dong and published by CRC Press. This book was released on 2016-09-19 with total page 341 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fiber laser, with its humble beginning in the late 1980s, has undergone tremendous development in the past decade or so, transforming itself from a research curiosity to a major force in modern manufacturing. Today, it is revolutionizing our economy by fundamentally changing the way we mark, machine, and process materials on an industrial scale. The recent development of high-power fiber lasers is also fundamentally shaping a wide range of other areas from physical sciences and medicine to geology and space exploration. In the past few years, the tactical deployment of direct energy weapons based on fiber lasers has become a reality. The development of fiber lasers is rooted in a number of technical areas including optical materials, optical waveguide design, nonlinear optics, optical fiber fabrication, and optical characterization, in addition to optical fiber components, and fiber laser design and architecture. No comprehensive in-depth coverage of such diverse topical areas has appeared in a single book. Many important developments have taken place in the past decade in both academia and industry. This book comprehensively covers the basics, technology and applications of fiber lasers including up-to-date developments in both academia and industry and is aimed to serve as both an introduction and research aid for graduate students, engineers, and scientists who are new to this field and also for veterans in the field
Download or read book Ultrafast Lasers written by Ursula Keller and published by Springer Nature. This book was released on 2022-03-07 with total page 810 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook presents a comprehensive introduction to ultrafast laser physics with a keen awareness of the needs of graduate students. It is self-contained and ready to use for both ultrafast laser courses and background for experimental investigation in the lab. The book starts with an advanced introduction to linear and nonlinear pulse propagation, details Q-switching and modelocking and goes into detail while explaining ultrashort pulse generation and measurement. Finally, the characterization of the laser signals is illustrated, and a broad range of applications presented. A multitude of worked examples and problems with solutions help to deepen the reader's understanding.
Download or read book From Quantum to Cosmos written by Slava G. Turyshev and published by World Scientific. This book was released on 2009 with total page 764 pages. Available in PDF, EPUB and Kindle. Book excerpt: Space-based laboratory research in fundamental physics is an emerging research discipline that offers great discovery potential and at the same time could drive the development of technological advances which are likely to be important to scientists and technologists in many other different research fields. The articles in this review volume have been contributed by participants of the international workshop "From Quantum to Cosmos : Fundamental Physics Research in Space" held at the Airlie Center in Warrenton, Virginia, USA, on May 21-24, 2006. This unique volume discusses the advances in our understanding of fundamental physics that are anticipated in the near future, and evaluates the discovery potential of a number of recently proposed space-based gravitational experiments. Specific research areas covered include various tests of general relativity and alternative theories, search of physics beyond the Standard Model, investigations of possible violations of the equivalence principle, search for new hypothetical long- and short-range forces, variations of fundamental constants, tests of Lorentz invariance and attempts at unification of the fundamental interactions. The book also encompasses experiments aimed at the discovery of novel phenomena, including dark matter candidates, and studies of dark energy.
Download or read book Progress in Photon Science written by Kaoru Yamanouchi and published by Springer. This book was released on 2019-01-23 with total page 521 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second volume of “Progress in Photon Science – Recent Advances” presents the latest achievements made by world-leading researchers in Russia and Japan. Thanks to recent advances in light source technologies; detection techniques for photons, electrons, and charged particles; and imaging technologies, the frontiers of photon science are now being expanding rapidly. Readers will be introduced to the latest research efforts in this rapidly growing research field through topics covering bioimaging and biological photochemistry, atomic and molecular phenomena in laser fields, laser–plasma interaction, advanced spectroscopy, electron scattering in laser fields, photochemistry on novel materials, solid-state spectroscopy, photoexcitation dynamics of nanostructures and clusters, and light propagation.
Download or read book The Generation and Propagation of Sub picosecond High peak power Laser Pilses written by Alan Michael Braun and published by . This book was released on 1997 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Field Guide to Laser Pulse Generation written by Rüdiger Paschotta and published by SPIE-International Society for Optical Engineering. This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This guide provides information on laser pulse generation, including Q switching, gain switching, mode locking, and the amplification of ultrashort pulses to high energies. Pulse characterisation is also covered, along with the physical aspects and various technical limitations.
Download or read book Solid State Lasers and Applications written by Alphan Sennaroglu and published by CRC Press. This book was released on 2017-12-19 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt: Because of the favorable characteristics of solid-state lasers, they have become the preferred candidates for a wide range of applications in science and technology, including spectroscopy, atmospheric monitoring, micromachining, and precision metrology. Presenting the most recent developments in the field, Solid-State Lasers and Applications focuses on the design and applications of solid-state laser systems. With contributions from leading international experts, the book explores the latest research results and applications of solid-state lasers as well as various laser systems. The beginning chapters discuss current developments and applications of new solid-state gain media in different wavelength regions, including cerium-doped lasers in the ultraviolet range, ytterbium lasers near 1μm, rare-earth ion-doped lasers in the eye-safe region, and tunable Cr2+:ZnSe lasers in the mid-infrared range. The remaining chapters study specific modes of operation of solid-state laser systems, such as pulsed microchip lasers, high-power neodymium lasers, ultrafast solid-state lasers, amplification of femtosecond pulses with optical parametric amplifiers, and noise characteristics of solid-state lasers. Solid-State Lasers and Applications covers the most important aspects of the field to provide current, comprehensive coverage of solid-state lasers.
Download or read book Investigation of Means for Generating High energy and Extremely Narrow Laser Pulses written by Anthony J. DeMaria and published by . This book was released on 1967 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: The simultaneous Q-switching and mode-locking of a 1-meter-long glass laser rod has produced a pulse having an energy content of 44 joules with a peak power of 4 gigawatts and time duration of approximately 1.5 x 10 to the -9th power sec. A 47-joule pulse has been obtained using a 45-cm-long glass rod as a simultaneous Q-switched and mode-locked oscillator and a 1-meter-long glass rod as an optical amplifier. The time duration of individual mode-locked pulses for this case was 0.75 x 10 to the 9th power sec. Use of a 16.5-cm-long oscillator and 1-meter-long amplifier resulted in generation of pulses with a peak power between 3.7 x 10 to the 10th power and 9.4 x 10 to the 10th power watts and time durations of 2 x 10 to the -11th power to 8 x 10 to the -12 power sec, respectively. These measurements are believed to represent the highest peak power pulses reported in literature to date. Experimental techniques for generating single, subnanosecond pulses having peak powers in the hundreds of megawatts range have been devised and made operative. A 600-megawatt peak power pulse of 0.4 x 10 to the -9th power sec time duration was obtained with a 45-cm-long oscillator. Using such an oscillator plus a 1-meter rod as an amplifier a single 0.5 x 10 to the -9th power sec pulse has been generated with an energy content of 1.8 joules. A Marx-Bank pulse generator was designed, constructed, and utilized in generation of these single, ultrashort optical pulses. These measurements represent the shortest single, optical pulses reported in the literature to date.
Download or read book Pulse shortening of passively Q switched microchip lasers written by Reinhold Lehneis and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Guided Wave Optics and Photonic Devices written by Shyamal Bhadra and published by CRC Press. This book was released on 2017-12-19 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt: Guided Wave Optics and Photonic Devices introduces readers to a broad cross-section of topics in this area, from the basics of guided wave optics and nonlinear optics to biophotonics. The book is inspired by and expands on lectures delivered by distinguished speakers at a three-week school on guided wave optics and devices organized at the CSIR-Central Glass and Ceramic Research Institute in Kolkata in 2011. An Introduction to Guided Wave Optics and Photonic Devices: Principles, Applications, and Future Directions The book discusses the concept of modes in a guided medium from first principles, emphasizing the importance of dispersion properties in optical fibers. It describes fabrication and characterization techniques of rare-earth-doped optical fibers for amplifiers and lasers, with an eye to future applications. Avoiding complex mathematical formalism, it also presents the basic theory and operational principles of fiber amplifiers and lasers. The book examines techniques for writing fiber Bragg gratings, which are of particular interest for smart sensing applications. A chapter focuses on the fundamental principles of Fourier optics and its implementation in guided wave optics. In addition, the book explains the critical phenomena of soliton dynamics and supercontinuum generation in photonic crystal fiber, including its fabrication process and characteristics. It also looks at plasmonics in guided media and nonlinearity in stratified media—both key areas for future research. The last chapter explores the importance of lasers in biophotonic applications. Written by experts engaged in teaching, research, and development in optics and photonics, this reference brings together fundamentals and recent advances in one volume. It offers a valuable overview of the field for students and researchers alike and identifies directions for future research in guided wave and photonic device technology.
Download or read book The Handbook of Photonics written by Mool C. Gupta and published by CRC Press. This book was released on 2018-10-03 with total page 1040 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reflecting changes in the field in the ten years since the publication of the first edition, The Handbook of Photonics, Second Edition explores recent advances that have affected this technology. In this new, updated second edition editor Mool Gupta is joined by John Ballato, strengthening the handbook with their combined knowledge and the continued contributions of world-class researchers. New in the Second Edition: Information on optical fiber technology and the economic impact of photonics Coverage of emerging technologies in nanotechnology Sections on optical amplifiers, and polymeric optical materials The book covers photonics materials, devices, and systems, respectively. An introductory chapter, new to this edition, provides an overview of photonics technology, innovation, and economic development. Resting firmly on the foundation set by the first edition, this new edition continues to serve as a source for introductory material and a collection of published data for research and training in this field, making it the reference of first resort.
