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Population Inversions In An Expanding Gas
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Book Synopsis Population Inversions in an Expanding Gas by : John David Anderson (Jr.)
Download or read book Population Inversions in an Expanding Gas written by John David Anderson (Jr.) and published by . This book was released on 1971 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is well established that population inversions between the (001) and (100) vibrational energy levels of CO2 can be created by rapid expansions of CO2-N2-H2O or He mixtures through supersonic nozzles. New experimental results are presented for such inversions. These experiments were conducted in both the 3-Megawatt Arc Tunnel and the 12.7 cm Shock Tunnel at the Naval Ordnance Laboratory. The results support previously published theoretical predictions obtained with a numerical, time-dependent, nonequilibrium nozzle flow analysis employing a simplified vibrational kinetic model. This theory is also compared with experimental data obtained by other investigators. (Author).
Book Synopsis A Time-dependent Quasi-one-dimensional Analysis of Population Inversions in an Expanding Gas by : John David Anderson (Jr.)
Download or read book A Time-dependent Quasi-one-dimensional Analysis of Population Inversions in an Expanding Gas written by John David Anderson (Jr.) and published by . This book was released on 1969 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: A time-dependent technique for the numerical solution of convergent-divergent, nonequilibrium nozzle flows was used to analyze the rapid, vibrational nonequlibrium, supersonic expansion of CO2-N2-H2O and CO2-N2-He mixtures, wherein the finite rate molecular energy transfer processes can result in a population inversion between the (001) and (100) vibrational energy levels of CO2. Results for such population inversions are presented. Among these, a comparison was made between the present results and the recent results of Basov et al; this comparison indicates that Basov's calculations overestimate the population inversion in an expanding mixture of CO2 and N2. In addition, results are presented from a series of numerical experiments conducted to assess the validity of several simplified methods for computing population inversions. (Author).
Book Synopsis Population Inversions in an Expanding Gas: Theory and Experiment by : John D Anderson (Jr)
Download or read book Population Inversions in an Expanding Gas: Theory and Experiment written by John D Anderson (Jr) and published by . This book was released on 1971 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is well established that population inversions between the (001) and (100) vibrational energy levels of CO2 can be created by rapid expansions of CO2-N2-H2O or He mixtures through supersonic nozzles. New experimental results are presented for such inversions. These experiments were conducted in both the 3-Megawatt Arc Tunnel and the 12.7 cm Shock Tunnel at the Naval Ordnance Laboratory. The results support previously published theoretical predictions obtained with a numerical, time-dependent, nonequilibrium nozzle flow analysis employing a simplified vibrational kinetic model. This theory is also compared with experimental data obtained by other investigators. (Author).
Book Synopsis A Time-dependent Quasi-one-dimensional Analysis of Population Inversions in an Expanding Gas by :
Download or read book A Time-dependent Quasi-one-dimensional Analysis of Population Inversions in an Expanding Gas written by and published by . This book was released on 1969 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: A time-dependent technique for the numerical solution of convergent-divergent, nonequilibrium nozzle flows was used to analyze the rapid, vibrational nonequlibrium, supersonic expansion of CO2-N2-H2O and CO2-N2-He mixtures, wherein the finite rate molecular energy transfer processes can result in a population inversion between the (001) and (100) vibrational energy levels of CO2. Results for such population inversions are presented. Among these, a comparison was made between the present results and the recent results of Basov et al; this comparison indicates that Basov's calculations overestimate the population inversion in an expanding mixture of CO2 and N2. In addition, results are presented from a series of numerical experiments conducted to assess the validity of several simplified methods for computing population inversions. (Author).
Book Synopsis Population Inversion in Adiabatic Expansion of a Gas Mixture by : V. K. Konyukhov
Download or read book Population Inversion in Adiabatic Expansion of a Gas Mixture written by V. K. Konyukhov and published by . This book was released on 1966 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The paper shows that adiabatic expansion of certain mixtures of molecular gases gives rise to the condition of population inversion in terms of vibrational levels existing for a certain time. To achieve this the molecules of the mixture should have substantially different vibrational relaxation times and should be capable of exchanging the energy of the vibrational excitation. (Author).
Book Synopsis Population Inversion Due to Recombination in Pulsed Gas Discharges by : Charles T. Pike
Download or read book Population Inversion Due to Recombination in Pulsed Gas Discharges written by Charles T. Pike and published by . This book was released on 1964 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vibrational Population Inversions Within Normal Shock Waves in CO2-N2-He Mixtures by : John David Anderson (Jr.)
Download or read book Vibrational Population Inversions Within Normal Shock Waves in CO2-N2-He Mixtures written by John David Anderson (Jr.) and published by . This book was released on 1970 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerical solutions are given for vibrational population inversions created in CO2-N2-He mixtures due to shock wave heating of a cold gas. The results indicate that population inversions between the (040) and (001) energy levels of CO2 and, to a lesser degree, between the (200) and (001) levels, can be created in the vibrational nonequilibrium flow behind a normal shock front. The properties of these inversions as a possible laser medium are assessed; the results indicate that the laser properties of this shock-induced nonequilibrium flow are not as promising as those of lasers operating on the principle of rapid expansions. (Author).
Book Synopsis Stationary Population Inversion in an Expanding Argon Plasma Jet by Helium Puffing by :
Download or read book Stationary Population Inversion in an Expanding Argon Plasma Jet by Helium Puffing written by and published by . This book was released on 2005 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experiment of He gas-contact for generating population inversion in a recombining Ar plasma jet is carried out. Population inversion between Ar I excited states 5s'->4p'[1/2]1 and 5s'->4p[3/2]1,2, [5/2]2,3 is created by helium gas-contact cooling of electrons, whereas it is not created without gas-contact. Ar I lines 1.14 m, 1.34 m, and 1.09 m are strongly enhanced due to the He gas cooling. It is experimentally found that helium gas contact effectively lowers electron temperature of the Ar plasma jet. The mechanisms giving rise to population inversion are discussed in terms of atomic collisional processes of the recombining plasma. The experimental results of electron temperature and population densities are discussed by simple numerical analysis which we previously developed. It is shown that the experimental results are well explained by our modeling quantitatively for the case without gas contact, except that the agreement of number densities of lower lying non-LTE levels is qualitative for the case with the gas contact.
Book Synopsis An Approximate Determination of Inversion Population and of the Amplification Factor of Gas During Adiabatic Expansion in the Nozzle (Priblizhennoe Opredelenie Inversnoi Zaselennosti i Koeffitsienta Usileniya Gaza Pri Adiabaticheskom Rasshirenii V Sople by : G. B. Gembarzhevskii
Download or read book An Approximate Determination of Inversion Population and of the Amplification Factor of Gas During Adiabatic Expansion in the Nozzle (Priblizhennoe Opredelenie Inversnoi Zaselennosti i Koeffitsienta Usileniya Gaza Pri Adiabaticheskom Rasshirenii V Sople written by G. B. Gembarzhevskii and published by . This book was released on 1974 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The article proposes to obtain analytical expressions for the power dependence and amplification factor of a gasdynamic laser upon the shape and dimensions of the nozzle, deceleration parameters and gas content valid for a wide scale of changes in these parameters; these analytical expressions should be arrived at by means of calculating the dependence of kinetic equations coefficients upon time.
Book Synopsis Equilibrium Normal Shock Properties for Vibrationally Excited CO2-N2-He Gas Mixtures by : Michael T. Madden
Download or read book Equilibrium Normal Shock Properties for Vibrationally Excited CO2-N2-He Gas Mixtures written by Michael T. Madden and published by . This book was released on 1970 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results are given for equilibrium properties behind incident and reflected normal shock waves in CO2-N2-He mixtures wherein the gas may be vibrationally excited but not chemically reacting. A rapid numerical iterative analysis is described, and the results are given in simple graphical form for convenient use in shock tube and shock tunnel experiments. The results are anticipated to be of particular use in determining reservoir conditions for shock tunnel experiments dealing with vibrational population inversions in rapidly expanding mixtures. (Author).
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1976 with total page 1118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Gasdynamic Lasers: An Introduction by : John D. Jr. Anderson
Download or read book Gasdynamic Lasers: An Introduction written by John D. Jr. Anderson and published by Elsevier. This book was released on 2012-12-02 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gasdynamic Lasers: An Introduction is a 12-chapter introductory text to major development generations of gasdynamic lasers, focusing on their underlying physical and fundamental aspects. The opening chapters discuss the basic detailed physical phenomena that ultimately are responsible for producing gasdynamic laser action and the methods of calculating the performance of these devices. These topics are followed by a chapter on confirmation of the performance calculations through arc and shock tunnel experiments. The discussion then shifts to vibrational relaxation process behind normal shock waves in CO2-N2-He mixtures and assesses their population inversions occurring in the nonequilibrium flow. Other chapters explore the concepts of downstream mixing and optical cavity in gasdynamic lasers, as well as the laser beam extracted from these devices. A systematic study of aerodynamic windows that use supersonic flow across the aperture is presented in the concluding chapters, along with the phenomena associated with gasdynamic laser diffusers. This introductory text will be of great value to professional scientists and engineers, as well as to students and workers in the field who are interested in interdisciplinary applied science.
Book Synopsis Laser Physics and Technology by : Pradeep Kumar Gupta
Download or read book Laser Physics and Technology written by Pradeep Kumar Gupta and published by Springer. This book was released on 2014-11-06 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book, ‘Laser Physics and Technology’, addresses fundamentals of laser physics, representative laser systems and techniques, and some important applications of lasers. The present volume is a collection of articles based on some of the lectures delivered at the School on ‘Laser Physics and Technology’ organized at Raja Ramanna Centre for Advanced Technology during March, 12-30, 2012. The objective of the School was to provide an in-depth knowledge of the important aspects of laser physics and technology to doctoral students and young researchers and motivate them for further work in this area. In keeping with this objective, the fourteen chapters, written by leading Indian experts, based on the lectures delivered by them at the School, provide along with class room type coverage of the fundamentals of the field, a brief review of the current status of the field. The book will be useful for doctoral students and young scientists who are embarking on a research in this area as well as to professionals who would be interested in knowing the current state of the field particularly in Indian context.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1990 with total page 1036 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Principles of Lasers by : Orazio Svelto
Download or read book Principles of Lasers written by Orazio Svelto and published by Springer Science & Business Media. This book was released on 2013-04-17 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is motivated by the very favorable reception given to the previous editions as well as by the considerable range of new developments in the laser field since the publication of the third edition in 1989. These new developments include, among others, quantum-well and muitiple-quantum-welliasers, diode-pumped solid-state lasers, new concepts for both stable and unstable resonators, femtosecond lasers, ultra-high-brightness lasers, etc. This edition thus represents a radically revised version of the preceding edition, amounting essentially to a new book in its own right. However, the basic aim has remained the same, namely to provide a broad and unified description of laser behavior at the simplest level which is compatible with a correct physical understanding. The book is therefore intended as a textbook for a senior-level or first-year graduate course and/or as a reference book. The most relevant additions or changes to this edition can be summarized as follows: 1. A much-more detailed description of Amplified Spontaneous Emission has been given (Chapter 2) and a novel simplified treatment of this phenomenon, both for homogeneous and inhomogeneous lines, has been introduced (Appendix C). 2. A major fraction of a new chapter (Chapter 3) is dedicated to the interaction of radiation with semiconductor media, either in a bulk form or in a quantum-confined structure (quantum-well, quantum-wire and quantum dot). 3.
Book Synopsis Gain Measurements in a Rapid Gas Dynamic Expansion by : A. L. Hoffman
Download or read book Gain Measurements in a Rapid Gas Dynamic Expansion written by A. L. Hoffman and published by . This book was released on 1970 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: A double expansion nozzle was used in a shock tube facility to study the population inversions achieved in a CO2 lasing gas mixture. For these experiments the double expansion nozzle, a form of gas-dynamic throttle, was a means for increasing the gain path length in the shock tube apparatus by a factor of five. Gain measurements were made for various reservoir conditions of temperature (1000
Book Synopsis CO2 Lasers Effects and Applications by : W Duley
Download or read book CO2 Lasers Effects and Applications written by W Duley and published by Elsevier. This book was released on 2012-12-02 with total page 444 pages. Available in PDF, EPUB and Kindle. Book excerpt: CO2 Lasers: Effects and Applications examines and summarizes the important applications of the device in different areas of study like physics, chemistry, and engineering. In some parts of the book, the reader is assumed to be knowledgeable in university level mathematics or some specialized area in physics or chemistry. The book consists of 10 chapters where the first two establish the general concepts on lasers and CO2 lasers, respectively. Chapter 3 takes the reader further and presents a comprehensive review of optical components for use such as detectors, windows, and mirrors. Because the CO2 laser is mostly used as a heat source, the theory of laser-surface heating is relevant in the discussion. This theory is presented in Chapter 4. Chapters 5 and 6 meanwhile present a summary of observations on cutting, welding, and some related topics. The following chapters discuss the different applications of CO2 lasers in different areas and processes. Some of these applications include in the generation of thermal effect, laser deposition of thin films, spectroscopy, laser photochemistry, and meteorology and communication systems. The text is a good source of reference to both students and scientists in the areas of physics, chemistry, and engineering.
