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Book Synopsis Tailoring the Emission of Stripe-array Diode Lasers with External Cavities to Enable Nonlinear Frequency Conversion by : Andreas Jechow
Download or read book Tailoring the Emission of Stripe-array Diode Lasers with External Cavities to Enable Nonlinear Frequency Conversion written by Andreas Jechow and published by Universitätsverlag Potsdam. This book was released on 2009 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: A huge number of applications require coherent radiation in the visible spectral range. Since diode lasers are very compact and efficient light sources, there exists a great interest to cover these applications with diode laser emission. Despite modern band gap engineering not all wavelengths can be accessed with diode laser radiation. Especially in the visible spectral range between 480 nm and 630 nm no emission from diode lasers is available, yet. Nonlinear frequency conversion of near-infrared radiation is a common way to generate coherent emission in the visible spectral range. However, radiation with extraordinary spatial temporal and spectral quality is required to pump frequency conversion. Broad area (BA) diode lasers are reliable high power light sources in the near-infrared spectral range. They belong to the most efficient coherent light sources with electro-optical efficiencies of more than 70%. Standard BA lasers are not suitable as pump lasers for frequency conversion because of their poor beam quality and spectral properties. For this purpose, tapered lasers and diode lasers with Bragg gratings are utilized. However, these new diode laser structures demand for additional manufacturing and assembling steps that makes their processing challenging and expensive. An alternative to BA diode lasers is the stripe-array architecture. The emitting area of a stripe-array diode laser is comparable to a BA device and the manufacturing of these arrays requires only one additional process step. Such a stripe-array consists of several narrow striped emitters realized with close proximity. Due to the overlap of the fields of neighboring emitters or the presence of leaky waves, a strong coupling between the emitters exists. As a consequence, the emission of such an array is characterized by a so called supermode. However, for the free running stripe-array mode competition between several supermodes occurs because of the lack of wavelength stabilization. This leads to power fluctuations, spectral instabilities and poor beam quality. Thus, it was necessary to study the emission properties of those stripe-arrays to find new concepts to realize an external synchronization of the emitters. The aim was to achieve stable longitudinal and transversal single mode operation with high output powers giving a brightness sufficient for efficient nonlinear frequency conversion. For this purpose a comprehensive analysis of the stripe-array devices was done here. The physical effects that are the origin of the emission characteristics were investigated theoretically and experimentally. In this context numerical models could be verified and extended. A good agreement between simulation and experiment was observed. One way to stabilize a specific supermode of an array is to operate it in an external cavity. Based on mathematical simulations and experimental work, it was possible to design novel external cavities to select a specific supermode and stabilize all emitters of the array at the same wavelength. This resulted in stable emission with 1 W output power, a narrow bandwidth in the range of 2 MHz and a very good beam quality with M²<1.5. This is a new level of brightness and brilliance compared to other BA and stripe-array diode laser systems. The emission from this external cavity diode laser (ECDL) satisfied the requirements for nonlinear frequency conversion. Furthermore, a huge improvement to existing concepts was made. In the next step newly available periodically poled crystals were used for second harmonic generation (SHG) in single pass setups. With the stripe-array ECDL as pump source, more than 140 mW of coherent radiation at 488 nm could be generated with a very high opto-optical conversion efficiency. The generated blue light had very good transversal and longitudinal properties and could be used to generate biphotons by parametric down-conversion. This was feasible because of the improvement made with the infrared stripe-array diode lasers due to the development of new physical concepts.
Book Synopsis Ecdl/Icdl Syllabus 4 Module 4 Spreadsheets Using Excel 2000 by : Cia Training Ltd Staff
Download or read book Ecdl/Icdl Syllabus 4 Module 4 Spreadsheets Using Excel 2000 written by Cia Training Ltd Staff and published by CIA Training Ltd.. This book was released on 2003-04 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: Module 4 ECDL/ICDL Syllabus 4.0. This manual helps you learn how to design spreadsheets, how to use basic functions to perform calculations within your spreadsheet and how to create and format charts. The manual comes with its own data files which you use for practising the relevant exercises. Approved by the ECDL Foundation.
Book Synopsis Work-based Learning in Primary Care by : Jonathan Burton
Download or read book Work-based Learning in Primary Care written by Jonathan Burton and published by Radcliffe Publishing. This book was released on 2003 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: A practical guide describing what work-based learning is, how it works and what makes it effective. It includes case studies taken from personal accounts of learning experiences from members of primary care teams.
Download or read book Advanced ECDL written by M. Strawbridge and published by Payne Gallway. This book was released on 2005 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Tunable External Cavity Diode Lasers by : Cunyun Ye
Download or read book Tunable External Cavity Diode Lasers written by Cunyun Ye and published by World Scientific. This book was released on 2004-01-01 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation. - Presents a thorough account of the state-of-the-art of tunable external cavity diode lasers Provides an up-to-date survey on physics, technology, and performance of widely applicable coherent radiation sources of tunable external cavity diode lasers May be used as a textbook for related undergraduate and graduate courses.
Book Synopsis Ecdl/Icdl Syllabus 4 Module 4 Spreadsheets Using Excel XP by : Cia Training Ltd Staff
Download or read book Ecdl/Icdl Syllabus 4 Module 4 Spreadsheets Using Excel XP written by Cia Training Ltd Staff and published by CIA Training Ltd.. This book was released on 2003-04 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: Module 4 ECDL/ICDL Syllabus 4.0. This manual helps you learn how to design spreadsheets, how to use basic functions to perform calculations within your spreadsheet and how to create and format charts. The manual comes with its own data files which you use for practising the relevant exercises. Approved by the ECDL Foundation.
Book Synopsis Ecdl / Icdl (Syllabus 4) Module 2 by : Cia Training Ltd Staff
Download or read book Ecdl / Icdl (Syllabus 4) Module 2 written by Cia Training Ltd Staff and published by CIA Training Ltd.. This book was released on 2003-04-21 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt: Module 2 ECDL/ICDL Syllabus 4.0. You will learn about the main operating features of Windows, the desktop and display settings on your computer. Approved by the ECDL Foundation.
Book Synopsis Research and Advanced Technology for Digital Libraries by : Christos Nikolaou
Download or read book Research and Advanced Technology for Digital Libraries written by Christos Nikolaou and published by Springer. This book was released on 2003-07-31 with total page 904 pages. Available in PDF, EPUB and Kindle. Book excerpt: Digital Libraries are complex and advanced forms of information systems which extend and augment their physical counterparts by amplifying existing resources and services and enabling development of new kinds of human problem solving and expression. Their complexity arises from the data-rich domain of discourse as well as from extended demands for multi-disciplinary input, involving distributed systems architectures, structured digital documents, collaboration support, human-computer interaction, information filtering, etc. In addition to the broad range of technical issues, ethics and intellectual property rights add to the complication that is normally associated with the development, maintenance, and use of Digital Libraries. The Second European Conference on Digital Libraries (ECDL’98) builds upon the success of the first of this series of European Conferences on Research and Advanced Technology for Digital Libraries, held last year in Pisa, Italy, September 1-3, 1997. This series of conferences is partially funded by the TMR Programme of the European Commission and is actively supported and promoted by the European Research Consortium on Informatics and Mathematics (ERCIM). The aim is to bring together the different communities involved in the development of Digital Libraries, to review progress and to discuss strategies, research and technological development (RTD) issues, as well as specific topics related to the European context. These communities include professionals from universities, research centres, industry, government agencies, public libraries, etc.
Book Synopsis The Doctor's Handbook by : Tony White
Download or read book The Doctor's Handbook written by Tony White and published by CRC Press. This book was released on 2018-04-19 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many doctors do not receive training early in their careers on the broad range of non-clinical aspects of their work, and confront day-to-day issues for which initial medical education has failed to prepare them. Experienced doctors and consultants can also experience a similar lack of accessible reference material on these aspects of their role and for the non-clinical training of their juniors. This book and its companion volume The Doctor's Handbook Part 2: understanding the NHS, have been written to address these and other needs. Previously published as The Specialist Registrar and New Consultant Handbook, these completely revised and reconfigured volumes reflect the changing everyday work of specialist trainees, registrars and consultants. Topics covered in Volume 1 include: *
Book Synopsis Cavity Ring-Down Spectroscopy by : Giel Berden
Download or read book Cavity Ring-Down Spectroscopy written by Giel Berden and published by John Wiley & Sons. This book was released on 2009-08-11 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cavity Ring-Down Spectroscopy: Techniques and Applications provides a practical overview of this valuable analytical tool, explaining the fundamental concepts and experimental methods, and illustrating important applications. Designed as both an introductory text and a reference source, this book is relevant for scientists unfamiliar with CRDS who are interested in using the technique in their research, as well as experienced users.
Book Synopsis A deep ultraviolet laser light source by frequency doubling of GaN based external cavity diode laser radiation by : Norman Ruhnke
Download or read book A deep ultraviolet laser light source by frequency doubling of GaN based external cavity diode laser radiation written by Norman Ruhnke and published by Cuvillier Verlag. This book was released on 2022-05-13 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: A compact and portable laser light source emitting in the wavelength range between 210 nm and 230 nm would enable numerous applications outside of laboratory environments, such as sterilization and disinfection of medical equipment, water purification or gas and air analysis using absorption spectroscopy. Such a source is also highly attractive for the identification and quantification of proteins and biomolecules by means of laser-induced fluorescence or Raman spectroscopy. In this thesis, a novel concept to realize such a compact and portable laser light source with low power consumption and an emission around 222 nm is investigated. The developed concept is based on single-pass frequency doubling of a commercially available high-power GaN laser diode emitting in the blue spectral range. Due to the low frequency doubling conversion efficiencies in this wavelength range of about 10-4 W-1, a laser diode with high optical output power above 1 W is required as pump source. Moreover, it has to exhibit narrowband emission in the range of the acceptance bandwidth of the applied nonlinear BBO crystal. Since GaN-based high-power laser diodes typically show broad emission spectra of Δλ = 1…2 nm, stabilizing and narrowing their wavelength by using external wavelength-selective elements is investigated and presented for the first time. With the understanding for the novel concept gained in this work, a compact ultraviolet laser light source was realized. It has a power consumption of less than 10 W and is exceptionally robust due to its immoveable components. The demonstrated output power of 160 μW enables numerous industrial and everyday applications for which previous laser systems have been too complex and overly cost- and energy-intensive.
Book Synopsis An Introduction to Library and Information Work by : Anne Totterdell
Download or read book An Introduction to Library and Information Work written by Anne Totterdell and published by Facet Publishing. This book was released on 2005 with total page 225 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fully revised and updated, the third edition of this introductory guide to library and information work introduces support staff, paraprofessionals and LIS students to the workplace. Informing the reader of the latest developments in the field, the text provides a practical, educational underpinning to library and information work across all sectors. It introduces the structure and functions of the principal types of library and information service and looks at the key information skills and areas of competence necessary for the efficient and informed practice of a wide range of tasks.
Book Synopsis Weaving Services and People on the World Wide Web by : Irwin King
Download or read book Weaving Services and People on the World Wide Web written by Irwin King and published by Springer Science & Business Media. This book was released on 2009-06-23 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ever since its inception, the Web has changed the landscape of human experiences on how we interact with one another and data through service infrastructures via various computing devices. This interweaving environment is now becoming ever more embedded into devices and systems that integrate seamlessly on how we live, both in our working or leisure time. For this volume, King and Baeza-Yates selected some pioneering and cutting-edge research work that is pointing to the future of the Web. Based on the Workshop Track of the 17th International World Wide Web Conference (WWW2008) in Beijing, they selected the top contributions and asked the authors to resubmit their work with a minimum of one third of additional material from their original workshop manuscripts to be considered for this volume. After a second-round of reviews and selection, 16 contributions were finally accepted. The work within this volume represents the tip of an iceberg of the many exciting advancements on the WWW. It covers topics like semantic web services, location-based and mobile applications, personalized and context-dependent user interfaces, social networks, and folksonomies. The presentations aim at researchers in academia and industry by showcasing latest research findings. Overall they deliver an excellent picture of the current state-of-the-art, and will also serve as the basis for ongoing research discussions and point to new directions.
Book Synopsis Ecdl/Icdl Syllabus 4. 0 Module 2 Using the Computer and Managing Files Using Windows 98 by : Cia Training Ltd Staff
Download or read book Ecdl/Icdl Syllabus 4. 0 Module 2 Using the Computer and Managing Files Using Windows 98 written by Cia Training Ltd Staff and published by CIA Training Ltd.. This book was released on 2003-04 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A compact mode-locked diode laser system for high precision frequency comparison experiments (Band 64) by : Heike Christopher
Download or read book A compact mode-locked diode laser system for high precision frequency comparison experiments (Band 64) written by Heike Christopher and published by Cuvillier Verlag. This book was released on 2021-04-09 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical frequency combs (OFC) have revolutionized various applications in applied and fundamental sciences that rely on the determination of absolute optical frequencies and frequency differences. The latter requires only stabilization of the spectral distance between the individual comb lines of the OFC, allowing to tailor and reduce system complexity of the OFC generator (OFCG). One such application is the quantum test of the universality of free fall within the QUANTUS experimental series. Within the test, the rate of free fall of two atomic species, Rb and K, in micro-gravity will be compared. The aim of this thesis was the development of a highly compact, robust, and space-suitable diode laser-based OFCG with a mode-locked optical spectrum in the wavelength range around 780 nm. A diode laser-based OFCG was developed, which exceeds the requirements with a spectral bandwidth > 16 nm at 20 dBc, a comb line optical power > 650 nW (at 20 dBc), a pulse repetition rate of 3.4 GHz, and an RF linewidth of the free-running pulse repetition rate < 10 kHz. To realize a proof-of-concept demonstrator module, the diode laser-based OFCG was hybrid-integrated into a space-suitable technology platform that has been developed for future QUANTUS experiments. Proof of sufficient RF stability of the OFCG was provided by stabilizing the pulse repetition rate to an external RF reference. This resulted in a stabilized pulse repetition rate with an RF linewidth smaller than 1.4 Hz (resolution limited), thus exceeding the requirement. The developed diode laser-based OFCG represents an important step towards an improved comparison of the rate of free fall of Rb and K quantum gases within the QUANTUS experiments in micro-gravity.
Book Synopsis The European Challenge by : Room, Graham
Download or read book The European Challenge written by Room, Graham and published by Policy Press. This book was released on 2005-09-07 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: Economic and social change is accelerating under the twin impact of globalisation and the new information technologies. But how are these processes interrelated? Are they impelling us towards a common socio-economic future? What can governments do if they want to manage and steer the direction of development? This book addresses these questions with particular reference to the European Union, which has made the development of a socially cohesive, knowledge-based economy its central task for the present decade. It assesses both the challenges and the policy instruments that are being deployed, focussing in particular on the dynamics of the 'new economy'; the new organisational architectures associated with rapid innovation; the transformation of education and training; the implications for social cohesion and exclusion and the role of policy benchmarking in promoting policy learning and enhancing national performance. The European Challenge presents the most up-to-date research on the development of the knowledge-based economy and its social and policy implications. Its accessible and integrated treatment of the processes of economic, social and technological change make it an invaluable resource for those studying and researching in the fields of public and social policy, organisational and technological change and innovation. It is also highly relevant to policy-makers who need to understand and manage this change.
Book Synopsis Timetable by : University of Illinois at Urbana-Champaign
Download or read book Timetable written by University of Illinois at Urbana-Champaign and published by . This book was released on 2003 with total page 786 pages. Available in PDF, EPUB and Kindle. Book excerpt:
