High Power Lasers Improvements and Applications

the 020 level is induced from several upper levels populating it highly for improved laser gain . The transition between the 02 ° 0 and 01'0 levels at 16 microns is then permitted by depopulating the 01'0 level with 5 micron radiation ...

High Power Lasers  Improvements and Applications


Applied mechanics reviews

... by laser and ion beams ) Laser cutting of metals ( Russian ) ( Visshaya Shokola , Moscow , 1988 ) IN81 High power ... Apr 1989 ( 88 : Int Soc Opt Eng , Bellingham WA , 1989 ) 6N58 High - power lasers : Improvements and applications ...

Applied mechanics reviews


Comprehensive Semiconductor Science and Technology

Quantum-Dot. Lasers: Physics. and. Applications. A Sobiesierski and P M Smowton, Cardiff University, Cardiff, ... Broad Gain Spectrum Applications High-Power Lasers Improving laser efficiency Temperature insensitivity of power output ...

Comprehensive Semiconductor Science and Technology

Semiconductors are at the heart of modern living. Almost everything we do, be it work, travel, communication, or entertainment, all depend on some feature of semiconductor technology. Comprehensive Semiconductor Science and Technology captures the breadth of this important field, and presents it in a single source to the large audience who study, make, and exploit semiconductors. Previous attempts at this achievement have been abbreviated, and have omitted important topics. Written and Edited by a truly international team of experts, this work delivers an objective yet cohesive global review of the semiconductor world. The work is divided into three sections. The first section is concerned with the fundamental physics of semiconductors, showing how the electronic features and the lattice dynamics change drastically when systems vary from bulk to a low-dimensional structure and further to a nanometer size. Throughout this section there is an emphasis on the full understanding of the underlying physics. The second section deals largely with the transformation of the conceptual framework of solid state physics into devices and systems which require the growth of extremely high purity, nearly defect-free bulk and epitaxial materials. The last section is devoted to exploitation of the knowledge described in the previous sections to highlight the spectrum of devices we see all around us. Provides a comprehensive global picture of the semiconductor world Each of the work's three sections presents a complete description of one aspect of the whole Written and Edited by a truly international team of experts

Two step MOVPE in situ etching and buried implantation applications to the realization of GaAs laser diodes

1999 Improved theory of the refractiveǦindex change in quantumǦwell lasers IEEE J. Sel. Top. Quantum Electron. ... 2013 High-power fibre lasers Nature Photonics 7 861Ǧ867 [81] P. Crump et al. 2013 Efficient High-Power Laser Diodes IEEE ...

Two step MOVPE  in situ etching and buried implantation  applications to the realization of GaAs laser diodes

This work is about two-step epitaxial growth using metalorganic vapor-phase epitaxy (MOVPE) for the realization of edge-emitting near-infrared laser diodes. The fabricated gallium arsenide-based devices fall into two categories: high-power lasers (watt range, multimodal) and tunable lasers (milliwatt range, monomodal). Common to both cases is that surface contamination – particularly that due to oxygen – needs to be removed before regrowth. Thus, in-situ etching with carbon tetrabromide (CBr4) is first studied. The experimental results include kinetic data, the effects of different etching conditions as well as substrate characteristics, and the effectiveness in reducing surface contamination. These investigations pave the way to devices based on 2-step epitaxy combined with in-situ etching. Correspondingly, thermally-tuned SG-DBR lasers operating around 975 nm have been successfully realized, obtaining a tuning range of 21 nm. In addition, the possibility of using electronic tuning in similar devices has been explored. High-power broad-area lasers have also been realized, using two-step epitaxy combined with ex-situ and in-situ etching, to create a buried, shallow “mesa” containing the active zone. This approach allows introducing lateral electrical and optical confinement, and – simultaneously – non-absorbing mirrors at the laser facets. Additionally, a different strategy to create a buried current aperture is presented, which is based on ion implantation followed by epitaxial regrowth. This enables to improve device performance and simultaneously introduce non-absorbing mirrors at the facets with correspondingly increased reliability.

Departments of State Justice and Commerce the Judiciary and Related Agencies Appropriations for 1976 Hearings Before 94 1

( 3 ) developing laser energy meter standards that require less technical capability by the operator . ... has made possible a factor of ten improvement in the efficiency of high power lasers for current industrial and future energy ...

Departments of State  Justice  and Commerce  the Judiciary  and Related Agencies Appropriations for 1976  Hearings Before        94 1


Departments of State Justice and Commerce the Judiciary and Related Agencies Appropriations for 1976 Department of Commerce National Bureau of Standards National Fire Prevention and Control Administration National Oceanic and Atmospheric Administration Office of Minority Business Enterprise Patent and Trademark Office Science and Technical Research

Plans for fiscal year 1976 include ( 1 ) maintaining primary and transfer laser energy meter standards . ... has made possible a factor of ten improvement in the efficiency of high power lasers for current Industrial and future energy ...

Departments of State  Justice  and Commerce  the Judiciary  and Related Agencies Appropriations for 1976  Department of Commerce   National Bureau of Standards  National Fire Prevention and Control Administration  National Oceanic and Atmospheric Administration  Office of Minority Business Enterprise  Patent and Trademark Office  Science and Technical Research


Departments of State Justice and Commerce the Judiciary and Related Agencies Appropriations for 1976

Plans for fiscal year 1976 include ( 1 ) maintaining primary and transfer laser energy meter standards . ... of high power lasers for current industrial and future energy generation applications , and is the basis for improvements in ...

Departments of State  Justice  and Commerce  the Judiciary  and Related Agencies Appropriations for 1976


Understanding Lasers

Prices have also come down, making a broader range of applications practical because high-power lasers can work faster and ... New improvements in beam combining and beam management have improved power density, so diodes can be used in ...

Understanding Lasers

The expanded fourth edition of the book that offers an essential introduction to laser technology and the newest developments in the field The revised and updated fourth edition of Understanding Lasers offers an essential guide and introduction that explores how lasers work, what they do, and how they are applied in the real world. The author—a Fellow of The Optical Society—reviews the key concepts of physics and optics that are essential for understanding lasers and explains how lasers operate. The book also contains information on the optical accessories used with lasers. Written in non-technical terms, the book gives an overview of the wide-variety laser types and configurations. Understanding Lasers covers fiber, solid-state, excimer, helium-neon, carbon dioxide, free-electron lasers, and more. In addition, the book also explains concepts such as the difference between laser oscillation and amplification, the importance of laser gain, and tunable lasers. The updated fourth edition highlights the most recent research and development in the field. This important resource: Includes a new chapter on fiber lasers and amplifiers Reviews new topics on physics of optical fibers and fiber lasers, disk lasers, and Ytterbium lasers Contains new sections on Laser Geometry and Implications, Diode Laser Structures, Optimal Parametric Sources, and 3D Printing and Additive Manufacturing Puts the focus on research and emerging developments in areas such as spectroscopy, slow light, laser cooling, and extremely precise measurements Contains appendices, glossary, and index that help make this book a useful reference Written for engineering and physics students, engineers, scientists, and technicians, the fourth edition of Understanding Lasers contains the basic concepts of lasers and the most recent advances in the technology.

High Power Lasers in Production Engineering

10.6 Future Improvements of Laser Cutting Although the technology of laser cutting is well established, ... Robotic applications for Nd:YAG laser cutting become increasingly interesting due to the high powers available nowadays.

High Power Lasers in Production Engineering

High power lasers of either the gas or solid state type can be used to generate a focal spot with a diameter of about a tenth of a millimetre and a power density of up to 100 Mio W/cm2. With these intensities all materials can be heated up rapidly, leading to fast melting, violent evaporation or even plasma formation. So laser beams can be utilized for various processing tasks, such as transformation hardening, cutting and ablation or welding and cladding or even rapid prototyping. With these processes, important advantages are achieved compared to conventional tools such as high processing speed due to the high concentration of energy and high quality of the processed workpiece without deformations due to the small overall heat input to the workpiece that corresponds to the small spot diameter. All these advantages finally result in strongly reduced production costs, which is the main reason for a world-wide substitution of conventional processes and other beam tools by laser technology. This monograph offers a great insight into the operation principles of high power laser sources, the phenomena of interaction of laser beams and materials and the mechanisms of the various production processes with lasers — thus enabling production engineers and others to make optimum use of the benefits of laser technology and to understand the technical properties and the physical limitations of this most recent technology (especially in comparison to conventional tools and other beam tools), and providing a sufficient basis for the understanding and use of future developments in this area.

Handbook of Laser Technology and Applications Principles

State - of - the - art single - mode devices like ridge - waveguide and narrow - stripe lasers are limited to output power levels of several 100 mW . A considerable part of the ongoing reseach activities on high - power lasers is ...

Handbook of Laser Technology and Applications  Principles


Handbook of Solid State Lasers

The ultimate limits of output power levels , most notably of one- and two - dimensional diode laser arrays , are being investigated . Such high - power lasers , especially if their coherence is improved , will find wide applications ...

Handbook of Solid State Lasers

Provides information on both state-of-the-art technology and fundamental principles of fully developed solid-state lasers, emphasizing their operational characteristics and physical properties. Six contributions discuss theories and techniques of III-V semiconductor diode lasers, describe various ty

Laser Induced Damage in Optical Materials

The improved dielectric HR stacks effectively shielded the Mo from the laser irradiation so that the thresholds of ... Highly damage resistant antireflection coating on the chemically etched surface for high - power lasers ( Yoshida ...

Laser Induced Damage in Optical Materials


Thermal Effects of High Power Laser Energy on Materials

6.10 Wear behavior of untreated and laser-alloyed ferritic stainless steel. (Source: Ref [40]) ) 30 m ( r ae w f o t n uo m A ... Applications of Laser Alloying Laser alloying has been primarily applied to improved corrosion resistance.

Thermal Effects of High Power Laser Energy on Materials

This book offers a tutorial on the response of materials to lasers, with an emphasis on simple, intuitive models with analytical and mathematical solutions, using techniques such as Laplace Transformation to solve most complex heat conduction equations. It examines the relationship between existing thermal parameters of simple metals and looks at the characteristics of materials and their properties in order to investigate and perform theoretical analysis from a heat conduction perspective mathematically. Topics discussed include optical reflectivity of metals at infrared (IR) wavelengths, laser-induced heat flow in materials, the effects of melting and vaporization, the impulse generated in materials by pulsed radiation, and the influence of the absorption in the blow-off region in irradiated material. Written for engineers, scientists, and graduate-level engineering and physics students, Thermal Effects of High Power Laser Energy on Materials provides an in-depth look at high energy laser technology and its potential industrial and commercial applications in such areas as precision cutting, LIDAR and LADAR, and communications. The knowledge gained from this allows you to apply spaced-based relay mirror in order to compensate laser beam divergence back to its original coherency by preventing further thermal blooming that takes place during laser beam propagation through the atmosphere. Examines the state-of-the-art in currently available high energy laser technologies; Includes computer codes that deal with the response of materials to laser radiation; Provides detailed mathematical solutions of thermal response to laser radiation.

High Power Lasers Science and Engineering

in ultra-high power/energy laser systems where presence of absorbing inclusions is very probable. ... These efforts resulted in an improvement of material technology and a development of effective methods of significant increase of LDR ...

High Power Lasers   Science and Engineering

In the thirty years since the invention of the CO2 gas laser, the major design issue has shifted from how to obtain the desired power level to how to achieve reliable operation. At the same time, the opening of many laser development facilities in the Former Soviet Union has allowed their achievements and design approaches to be understood and appreciated for the first time. Further, the industrial laser user community has identified a number of emerging applications at higher power levels (15-20 kW) than are attainable by most commercial devices. In High Power Lasers - Science and Engineering, the designers, developers and users of high-power gas laser systems discuss design approaches, methods of enhancing performance, new applications, and user requirements.

Departments of State Justice and Commerce the Judiciary and Related Agencies Appropriations for

V Plans for fiscal year 1976 Include ( 1 ) maintaining primary and transfer laser energy meter standards This must ... of high power lasers for current Industrial is the basis for improvements in electrical power distribution equipment ...

Departments of State  Justice  and Commerce  the Judiciary  and Related Agencies Appropriations for


Technologies of Light

Examples of successful applications are holographic dilatation and strain measurements, scanners for pattern recognition and the laser gyroscope. High power lasers for cutting, welding and heat treatment applications are also used ...

Technologies of Light

Discoveries and inventions periodically cause new technological developments within human societies. Key inventions and their accompanying economic and social changes can be seen as the main promoters of technological and structural progress. Many examples of change can be traced back to key inventions. At the end of the last century, one of the major lines of technological development was the implementation of electricity, the introduction of electric current. Inno vations were generated both by applying the "low quality" thermal and energy transmission properties, as well as by studying "high quality" characteristics like signal processing and electromagnetic wave propagation. In the field of signal processing, particular devices like the thermionic valve, the transistor and the (micro) chip deserve mention. Regarding energy generation, distribution and consumption, huge investments were made in coal and nuclear power plants, as well as in consumer and industrial electric appliances. Which innovations can be expected to improve or replace some of the applications (products, processes) of electricity? Thinking of an important technology invented about three decades ago - the laser - coherent light plays the key role in the process ("light amplification by stimulated emission of radiation"). Thus the new term technologies of light can be used for such innovations. Extending the definition, "technologies of light" or "photonics" can be defined as any methods, processes or products which make use of the spectrum of light, and any systems whose function is to study, measure, transform or transmit by means of light.

International Conference on Laser Materials and Devices

Additional improvements of laser glass elements ' thermal shock resistance and chemical stability by chemical processing and protecting thin film ... The main results are connected with high - power lasers for plasma research .

International Conference on Laser Materials and Devices


Inventory of Current Energy Research and Development

PERMUTED INDEX ON TITLE # High - Power Laser Sytems Technology #Advancing Oil - Shale #Advancing Oil - Shale ... Improved #Liquid Fuels from Coal -- Application of Improved #SYNTHANE Coal Gasification -- Application of Improved to High ...

Inventory of Current Energy Research and Development


Ballistic Missile Defense System BMDS

Improvements in high power chemical lasers can significantly enhance the potential effectiveness of future laser weapon ... Multi - Application Focal Plane Arrays Development of focal plane arrays technology , including simultaneous ...

Ballistic Missile Defense System  BMDS


Laser Induced Damage In Optical Materials 1981

Besides the demonstration of acceptable absorption levels in the infrared , they possess improved mechanical properties ... It was not unexpected that in the press of evolving applications and new high - power lasers that several papers ...

Laser Induced Damage In Optical Materials  1981