Download or read book Gas Ratio and Pressure Effects on the 6328 A0 Transition of the Helium neon Gas Laser written by Edwin Karl Freytag and published by . This book was released on 1967 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a review paper of current literature in the area of pressure effects on gaseous lasers. This thesis discusses the mechanisms which relate the relative power output of the 6328 A[superscript 0] neon transition to total and partial pressure variations of the helium-neon gaseous laser. The operation of the helium-neon gas system utilized to obtain this visible transition is described. The rates and modes of production and destruction of the helium metastable atoms are presented. The interaction of the two gases and the requirements for sustained population inversion of the neon laser levels are considered, including inelastic electron collisions and radiation trapping. Some assumptions and approximations are made to prevent the analysis from becoming too cumbersome. The effective transition rates of the upper and lower laser levels are shown to be functions of the total and partial pressures. Some available data is presented. It is shown that good agreement exists between the data and the proposed models. Some inconsistencies between the data of various authors exist so that these models do not give a quantitative analysis of the lasing process but rather represent segments of the lasing process.
Download or read book The Laser Literature written by Kiyo Tomiyasu and published by Springer. This book was released on 2013-11-09 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pressure Gas Ratio and Operation Voltage Optimization of a Helium neon Laser written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Aim of this thesis is to investigate the optimum working parameters of a helium-neon laser. Partial pressure ratios, total pressures of the gases and voltage-current characteristics were studied. The analysis of the results includes the minor factors (impurity, volume, etc.) and their effects to main parameters (laser power, voltage, current). Tables, which were formed by measured optical parameters as wavelength and power, converted to graphs and from these graphs optimal working conditions for the laser are obtained.
Download or read book Atomic Gas Laser Transition Data written by William Ralph Bennett and published by Springer. This book was released on 1979-11-30 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lasers and Masers a Continuing Bibliography written by United States. National Aeronautics and Space Administration and published by . This book was released on 1965 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lasers and Masers written by and published by . This book was released on 1962 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Hydrogen on the 585 3 nm Helium neon Nuclear pumped Laser written by Yasser Ragab Shaban and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of hydrogen as an admixture gas in the ($\sp3$He)$\sp4$He-Ne laser at the 2P$\sb1$-1S$\sb2,$ 585.3-nm Ne transition has been found to be more effective in depopulating the lower excited laser state, 1S$\sb2,$ than the use of heavy inert (noble) gases. Experimental results using the U of Illinois TRIGA reactor to pump this laser mixture at 585.3 nm feature the lowest threshold power density ever reported for visible nuclear-pumped, e-pumped and heavy ion beam-pumped lasers. The threshold neutron flux for the above transition was $1.5 \times 10\sp{13}$ n/(cm$\sp2$-sec), corresponding to threshold pumping power density 43 $\pm$ 2 mW/cm$\sp3.$ This is the second-lowest threshold power density observed for NPLs over all wavelengths, second only to the Soviet results on Ar-Xe infrared lasers (2.05 and 2.65 $\mu$m) that have a threshold power of $\sim20$ mW/cm$\sp3.$ Preceding the actual laser experiments, a series of gain experiments were carried out with various $\sp3$He:Ne:H$\sb2$ gas mixtures to guide us to the appropriate mixture ratio needed for lasing. The laser cell, 100 cm long and 1.5 cm in diameter, was fitted with a chopper fan placed in front of the rear mirror. Lasing was observed for $\sp3$He:Ne:H$\sb2$ mixture ratios 5.3:2.7:2, 5.6:2.9:1.5, and 6:3:1 with total pressures 2023, 2140, and 1928 torr respectively. Lasing was also observed for $\sp4$He:Ne:H$\sb2$ mixture ratio 2.7:5.6:1.7 with total pressure 990 torr, where lasing was pumped by a $\sp{10}$B-coated tube. A unique internal energy transfer (IET) model was developed to explain qualitatively and quantitatively the energy transfer mechanisms from the neon excited atom to the quencher atom. The IET model favors the use of open-shell atoms for faster energy transfer (quenching). The IET model suggests that the quenching of the lower excited laser level with hydrogen and argon atoms occurs at thermal energy (0.1 eV), whereas the quenching of the upper excited laser level with hydrogen and argon atoms occurs at 1.4 eV and 0.3 eV, respectively. A general kinetic model was developed, and it estimates the threshold power density to be 40 mw/cm$\sp3$ and the laser efficiency to be 1.7%. In contrast, the measured laser efficiency was found to be only 0.013% which is in good agreement with the laser efficiencies of the He-Ne-Ar, 585.3 nm reported in the USSR and at Sandia National Lab, which are 0.1% and 0.01%, respectively.
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1975 with total page 960 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Introduction to Atomic and Nuclear Physics written by Henry Semat and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 724 pages. Available in PDF, EPUB and Kindle. Book excerpt: to Atomic and Nuclear Physics Aerial view of the National Accelerator Laboratory, Batavia, Illinois. (Photograph courtesy of NAL.) Introduction to Atomic and Nuclear Physics HENRY SEMAT Professor Emeritus The City College of the City University of New York JOHN R. ALBRIGHT The Florida State University FIFTH EDITION LONDON NEW YORK CHAPMAN AN D HALL First edition 1939 Fifth edition, first published in the U.S.A. by Holt, Rinehart and Winston, Inc. Fifth edition first published in Great Britain 1973 by Chapman and Hall Ltd 11 New Fetter Lane, London EC4P 4EE Reprinted as a paperback 1978 Reprinted 1979, 1983, 1985 © 1939, 1946, 1954, 1962 by Henry Semat © 1972 by Holt, Rinehart and Winston, Inc. Fletcher & Son Ltd, Norwich ISBN-13: 978-0-412-15670-0 e-ISBN-13: 978-1-4615-9701-8 DOl: 10.1007/978-1-4615-9701-8 All rights reserved. No part of this book may be reprinted, or reproduced or utilized in any form or by any electronic, mechanical, or other means, now known or hereafter invented, including photocopying and recording, or in any information storage and retrieval system, without permission in writing from the Publisher.
Download or read book U S Government Research Development Reports written by and published by . This book was released on 1967 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Physics Volume Ii written by Karkare and published by I. K. International Pvt Ltd. This book was released on 2008 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Theses and Dissertations Oregon State University written by and published by . This book was released on 1973 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Masters Theses and Doctoral Dissertations in the Pure and Applied Sciences Accepted by Colleges and Universities of the United States written by and published by . This book was released on 1968 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Theses and Dissertations 1966 1970 Oregon State University written by Margaret Basilia Guss and published by . This book was released on 1973 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1976 with total page 978 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lasers and Masers A Continuing Bibliography with Indexes written by and published by . This book was released on 1967 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CRC Handbook of Lasers written by Robert J. Pressley and published by CRC Press. This book was released on 1971 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt: Critically evaluated original data, both published and unpublished, relevant to laser research and development. Listings of laser transitions represent data as of summer, 1970. Arrangement by 21 topics. References included. Tables, charts, graphs. Index of wavelengths, subject index.
