Principles of Lasers
A laser beam has the special property that the light waves emitted are all in step with one another — coherent — and usually of one wavelength, or colour. There are many different kinds of lasers, from giant installations emitting powerful pulses of high-energy radiation, such as X-rays, to tiny devices etched onto semiconductor chips producing infrared light. Some lasers are designed to emit a continuous beam while others can spit out rapid pulses of light that are ultra-short.
In fact, although the first laser was constructed in the s, practical applications did not appear until a couple of decades later — as is often the case in science.
Overview of Lasers
Since then, thanks to research activity in both university physics departments and companies, including those in the UK, lasers have become ubiquitous and are central to many technologies that are used in manufacturing, communications, medicine and entertainment. Today, lasers are key tools in manipulating and communicating information in CD and DVD players, supermarket barcode readers and broadband telecommunications , in measurement surveying and environmental studies , chemical analysis of foods, medical specimens and materials and, increasingly, in transforming materials welding, cutting and etching, printing, and surgery.
Research into lasers continues apace — new types of laser are being developed with a variety of characteristics and potential applications. In some cases, the result is a cheaper, more compact portable device designed for a specific use, or a more powerful laser used to generate power, for instance. UK university physics departments are at the forefront of many of these areas.
Principles of Lasers | Orazio Svelto | Springer
In particular, physicists in the Central Laser Facility CLF at the Rutherford Appleton Laboratory develop novel high-powered laser systems and make them available for both pure and applied research. The laser would never have been developed without a profound understanding of an area of fundamental physics — quantum theory.
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Einstein had previously shown that light was composed of tiny packets of wave energy called photons the wavelength depending on the energy. He theorised that if the atoms that make up a material are given excess energy and so emit photons, these photons could stimulate nearby atoms to emit further photons, creating a cascade effect. All the photons would have the same energy and wavelength and move off in the same direction.
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However, it was not until 40 years later that physicists were able to convert this idea into a practical laser. The resulting stimulated light emission is then amplified by bouncing the light back and forth through the lasing material in a mirrored cavity, so stimulating more emission, before it escapes through a transparent mirror section as a laser beam.
A device that amplified microwaves was constructed in by Charles Townes and colleagues at Columbia University.
Townes shared a Nobel Prize in Physics in with Nikolay Basov and Aleksandr Prochorov of the Lebedev Institute in Moscow who independently also demonstrated what came to be called a maser. The next few years saw a race to build the first visible light laser. Initially the laser concept was not taken very seriously, nevertheless the s saw a huge expansion in laser research including the development of high-power gas lasers, chemical lasers and semiconductor lasers.
However, they were still rather specialised research tools. By the s, semiconductor lasers that worked at room temperature had been developed and this led to the advent of the compact disc CD. Het is echter in een enkel geval mogelijk dat door omstandigheden de bezorging vertraagd is. Bezorgopties We bieden verschillende opties aan voor het bezorgen of ophalen van je bestelling. Welke opties voor jouw bestelling beschikbaar zijn, zie je bij het afronden van de bestelling.
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PRINCIPLES OF LASERS
Auteur: Orazio Svelto D. Uitgever: Kluwer Academic Publishers Group. Co-auteur: Svelto. Samenvatting This new Fourth Edition of Principles of Lasers is so thoroughly updated and expanded that it is virtually a whole new book. But the text's essential mission remains the same: to provide a wide-ranging yet unified description of laser behavior, physics, technology, and current applications.
Svelto emphasizes the physical rather than the mathematical aspects of lasers, and presents the subject in the simplest terms compatible with a correct physical understanding. Praise for earlier editions: "Professor Svelto is himself a longtime laser pioneer and his text shows the breadth of his broad acquaintance with all aspects of the field … Anyone mastering the contents of this book will be well prepared to understand advanced treatises and research papers in laser science and technology. Schawlow, Nobel Laureate in Physics "Already well established as a self-contained introduction to the physics and technology of lasers … Professor Svelto's book, in this lucid translation by David Hanna, can be strongly recommended for self-study or teaching at the final-year undergraduate or first-year post-graduate levels.
It is logically organized and easy to read … Most of the basic mathematical framework needed to understand this evolving field is presented.
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Every chapter contains a good set of problems, answers to some of which are given in the back. His research has covered a wide range of activity in the field of laser physics and quantum electronics, starting from the very beginning of these disciplines. This activity includes ultrashort-pulse generation and applications, development of laser resonators and mode-selection techniques, laser applications in biology and medicine, and development of solid-state lasers.
Professor Svelto is the author of more than scientific papers and his researches have been the subject of more than 50 invited papers and international conferences.
Toon meer Toon minder. Recensie s Certainly, the student who is led into the laser field by this text is lucky.
The text is excellent and filled with appropriate illustrations. The questions are also helpful as they highlight the important topics. All important types of lasers are considered and for each type the proper background is developed.