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Author: R. L. Kerber
Publisher:
ISBN:
Category :
Languages : en
Pages : 282
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Book Description
The goal of this research is to quantify laser pulse energy and intensity on P-branch and rotational lasing transitions and provide data from well-defined experiments for interpretation and analysis of computational studies of HF and DF chemical lasers. A compendium of technical reports and publications on rotational non-equilibrium effects in the HF and DF lasers is presented. Modeling efforts have assessed the sensitivity of laser performance to various kinetic mechanisms. The importance of rotational non-equilibrium is identified and the possible effect of vibrational to rotational energy transfer on P-branch and rotational lasing is considered.
Author: R. L. Kerber
Publisher:
ISBN:
Category :
Languages : en
Pages : 282
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Book Description
The goal of this research is to quantify laser pulse energy and intensity on P-branch and rotational lasing transitions and provide data from well-defined experiments for interpretation and analysis of computational studies of HF and DF chemical lasers. A compendium of technical reports and publications on rotational non-equilibrium effects in the HF and DF lasers is presented. Modeling efforts have assessed the sensitivity of laser performance to various kinetic mechanisms. The importance of rotational non-equilibrium is identified and the possible effect of vibrational to rotational energy transfer on P-branch and rotational lasing is considered.
Author: Ronald L. Kerber
Publisher:
ISBN:
Category :
Languages : en
Pages : 278
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Book Description
A computer modeling study of pulsed H2+F2 and D2+F2 chemical lasers has been conducted. This work was directed toward understanding the role of kinetic rotational relaxation and vibrational-rotational relaxation mechanisms in HF and DF lasers. This study resulted in very comprehensive computer models that could predict spectral characteristics of pulsed laser performance using kinetics rate equation data and experimental conditions. In addition, experiments were conducted on a flash initiated pulsed H2+F2 laser facility to generate data to compare with the models developed in this study. Models were also developed that demonstrated the performance of pulsed laser driven amplifiers and optical resonance transfer lasers. Finally, simple models were constructed that permit efficient prediction of pulse energy and pulse power. (Author).
Author: Kenneth Smith
Publisher: Springer Science & Business Media
ISBN: 1475706413
Category : Science
Languages : en
Pages : 427
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Book Description
Author: Joseph J. T. Hough
Publisher:
ISBN:
Category :
Languages : en
Pages : 87
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Book Description
A comprehensive rate equation model for a pulsed laser pumped by the H2(D2)-F2 reaction is described. This computer simulation incorporates up to 216 kinetic reactions to describe the laser medium, which is assumed to be homogeneous and contained in a Fabry-Perot optical cavity. The first fifteen vibrational-rotational P-branch transitions from each of the lowest ten vibrational bands are monitored for possible laser action. The distinctive features incorporated in this model include: (1) the elimination of the gain-equals-loss assumption, so that it is possible to predict cavity transients and to observe gain-intensity interactions; (2) a detailed model of the Lorentz broadening, including V, J dependence, as well as distinction between various perturbing species; (3) multiquantum HF (DF) self-deactivation, which in the HF case was found important to achieve good agreement between theory and experiment. Comparisons of the prediction of this model with several small-scale experiments have indicated generally good agreement (typically within approx. 20%). (Author).
Author: Warren K. Jaul
Publisher:
ISBN:
Category : Lasers
Languages : en
Pages : 368
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Book Description
Author: Ronald L. Kerber
Publisher:
ISBN:
Category :
Languages : en
Pages : 49
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Book Description
A computer simulation of a pulsed HF laser pumped by the H2 + F2 chain reaction is presented. A chemical kinetic model encompassing 68 reactions is used to approximate the reacting mixture contained within an optical cavity. For each vibrational level, a Boltzmann distribution for the rotational levels is assumed with lasing on the vibrational band at line center of the transition having maximum gain. An analysis of cavity and chemical mechanisms yields a simple relationship between the pumping and depletion rates of the vibrational levels. This relationship is used to make a comprehensive study of the effects of cavity and chemical parameters on the laser pulse. The effect of changes in uncertain chemical reaction rate coefficients is assessed. (Author).
Author: Ronald L. Kerber
Publisher:
ISBN:
Category :
Languages : en
Pages : 93
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Book Description
The chemical and energy transfer reactions involved in the helium-diluted DF-CO2 chemical transfer laser system are discussed. Experimental and theoretical rate coefficient literature is reviewed, and the most probable rates are selected for the kinetic model of the reaction system. Results of computer experiments show the relative importance of these reactions for pulsed laser simulation. Predicted laser performance is most sensitive to values of rate coefficients for DF-CO2 transfer, collisional deactivation of CO2(00 sup 0,1) by DF, and collisional deactivation of DF(v) by D and F.A detailed investigation of the relationship of cavity and chemical mechanisms for two levels of initiation is presented for an initial composition of XF:1F2:ID2:8CO2:40He at 50 torr and 300K with X = 0.1 and 0.01. For F = 0.01, a 260-microsec pulse with 6% chemical efficiency is predicted, while the higher level initiation level (F = 0.1) produces a 52-microsec pulse with 8% efficiency. (Author).
Author:
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 280
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Book Description
Author: Narendra B. Dahotre
Publisher: John Wiley & Sons
ISBN: 3527347917
Category : Technology & Engineering
Languages : en
Pages : 308
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Book Description
Laser-Based Additive Manufacturing Explore laser-based additive manufacturing processes via multi-scale modeling and computer simulation In Laser-Based Additive Manufacturing: Modeling, Simulation, and Experiments, a distinguished team of researchers delivers an incisive framework for understanding materials processing using laser-based additive manufacturing (LAM). The book describes the use of computational modeling and simulation to explore and describe the LAM technique, to improve the compositional, phase, and microstructural evolution of the material, and to enhance the mechanical, chemical, and functional properties of the manufactured components. The accomplished authors combine a comprehensive overview of multi-scale modeling and simulation with experimental and practical observations, offering a systematic review of laser-material interactions in advanced LAM processes. They also describe the real-world applications of LAM, including component processing and surface functionalization. In addition to explorations of residual stresses, three-dimensional defects, and surface physical texture in LAM, readers will also find: A thorough introduction to additive manufacturing (AM), including the advantages of AM over conventional manufacturing and the challenges involved with using the technology A comprehensive exploration of computation materials science, including length- and time-scales in materials modeling and the current state of computational modeling in LAM Practical discussions of laser-material interaction in LAM, including the conversion of light energy to heat, modes of heat dissipation, and the dynamics of the melt-pool In-depth examinations of the microstructural and mechanical aspects of LAM integrated with modeling Perfect for materials scientists, mechanical engineers, and physicists, Laser-Based Additive Manufacturing: Modeling, Simulation, and Experiments is perfect for anyone seeking an insightful treatment of this cutting-edge technology in the areas of alloys, ceramics, and composites.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 692
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Book Description
