Theoretical Modeling of Microwave- and Infrared-pumped High-pressure Gas Lasers with Application to the XeCl Laser PDF Download
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Author: Toshihiko Ishihara
Publisher:
ISBN:
Category :
Languages : en
Pages : 366
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Author: Toshihiko Ishihara
Publisher:
ISBN:
Category :
Languages : en
Pages : 366
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Author: Sheng-Bai Zhu
Publisher:
ISBN:
Category : Excimer lasers
Languages : en
Pages : 712
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Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 750
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Author: Fan Wang (Ph. D.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 134
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The terahertz region, in the heart of the electromagnetic spectrum, has been the least utilized, in part due to inadequacies of available sources. Optically pumped far-infrared (OPFIR) lasers were one of the most powerful continuous-wave terahertz sources. However, such lasers have long been thought to have intrinsically low efficiency, not tunable in frequency, and large sizes. In this thesis, we introduce a compact, frequency-tunable source of terahertz radiation with high efficiency. We first present both an innovative theoretical model and experimental validation of a Methyl Fluoride OPFIR laser at 0.25 THz that exhibits 10x greater efficiency and 1,000x smaller volume than the best commercial lasers. Unlike previous OPFIR-laser models involving only a few energy levels that failed even qualitatively to match experiments at high pressures, our ab-initio theory matches experiments quantitatively, within experimental uncertainties with no free parameters, by accurately capturing the interplay of millions of degrees of freedom in the laser. Moreover, we demonstrate a widely frequency-tunable compact terahertz radiation with laughing gas (nitrous oxide N2O) pumped by a quantum cascade laser (QCL). In experiments, broad tunability is achieved over 31 lines spanning 0.25-0.80 THz, each with kilohertz linewidths. Our comprehensive theoretical model is able to constrain the key molecular parameters and predict the optimal performance of the laser. The concept of QCL-pumped molecular laser (QPML) is a universal while revolutionary concept characterized by unprecedented frequency tunability over a wide range of rotational transitions using a single molecular gas as the gain medium. An analytical theory for QPML is presented to study the key factors for improving the laser performance. We believe that these developments will revive interest in optically pumped molecular laser as a powerful, tunable, and compact source of terahertz radiation.
Author: E. W. McDaniel
Publisher: Academic Press
ISBN: 1483218686
Category : Science
Languages : en
Pages : 486
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Applied Atomic Collision Physics, Volume 3: Gas Lasers describes the applications of atomic collision physics in the development of many types of gas lasers. Topics covered range from negative ion formation in gas lasers to high-pressure ion kinetics and relaxation of molecules exchanging vibrational energy. Ion-ion recombination in high-pressure plasmas is also discussed, along with electron-ion recombination in gas lasers and collision processes in chemical lasers. Comprised of 14 chapters, this volume begins with a historical summary of gas laser developments and an overview of the basic operating principles of major gas laser types. The discussion then turns to the mechanism of formation of negative ions in gas lasers; ion-ion recombination in high-pressure plasmas; electron-ion recombination in gas lasers; and collision processes in chemical lasers. Subsequent chapters focus on high-energy carbon dioxide laser amplifiers; spectroscopy and excited state chemistry of excimer lasers; rare-gas halide lasers; transient optical absorption in the ultraviolet; and pre-ionized self-sustained laser discharges. The final chapter considers the stability of excimer laser discharges. This book will be of interest to physicists and chemists.
Author: Gennadiĭ Andreevich Mesi︠a︡t︠s︡
Publisher: SPIE Press
ISBN: 9780819417091
Category : Technology & Engineering
Languages : en
Pages : 392
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Author:
Publisher:
ISBN:
Category : Chemical abstracts
Languages : en
Pages : 2210
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Author:
Publisher:
ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 760
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Author: Kenneth Smith
Publisher: Springer Science & Business Media
ISBN: 1475706413
Category : Science
Languages : en
Pages : 427
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Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 1254
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