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Theoretical Studies Of High Energy Pulsed Co2 Lasers
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Book Synopsis Theoretical Studies of High Energy Pulsed CO2 Lasers by : Charles Cason
Download or read book Theoretical Studies of High Energy Pulsed CO2 Lasers written by Charles Cason and published by . This book was released on 1972 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pulsed CO2 lasers are receiving considerable attention at the US Army Missile Command because of their advantages over cw lasers. Theoretical studies of laser kinetic processes, together with a new pressure scaling method developed in-house, have led to the development of a useful mathematical model for electron-beam-controlled CO2 lasers which shows close agreement with experimental observations. The model has indicated that energies approaching 80 joules/liter-atm are possible. The current goal of a 10-kJ/pulse laser is realizable in a 200 liter-atm laser is realizable in a 200 liter-atm laser structure.
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 1993 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book CO2 Laser written by Dan C. Dumitras and published by BoD – Books on Demand. This book was released on 2012-03-21 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present book includes several contributions aiming a deeper understanding of the basic processes in the operation of CO2 lasers (lasing on non-traditional bands, frequency stabilization, photoacoustic spectroscopy) and achievement of new systems (CO2 lasers generating ultrashort pulses or high average power, lasers based on diffusion cooled V-fold geometry, transmission of IR radiation through hollow core microstructured fibers). The second part of the book is dedicated to applications in material processing (heat treatment, welding, synthesis of new materials, micro fluidics) and in medicine (clinical applications, dentistry, non-ablative therapy, acceleration of protons for cancer treatment).
Book Synopsis High Specific Energy Pulsed Electric Discharge Laser Research by : D. H. Douglas-Hamilton
Download or read book High Specific Energy Pulsed Electric Discharge Laser Research written by D. H. Douglas-Hamilton and published by . This book was released on 1975 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theoretical and experimental investigations are presented of laser kinetics related to the use of combustion product gases in CO2 laser systems. Several processes for producing the laser gas are also considered. The sensitivity of laser performance to gas composition and to level of impurities is considered theoretically. The role of CO and the appropriate fractions of H2 and H2O are examined. Maximum allowable amounts of impurities (O2, hydrocarbons, water vapor and particulates) are determined. The laser output was measured for a variety of gases related to possible combustion product gas mixtures. Some actual combustion product mixtures were tested as well. The measured laser performance generally agreed well with prediction, with the exception of CO-containing gases where a 15 - 25 percent discrepancy for 12 percent CO was found. No unexpected problems due to impurities were found when using the actual combustion product gas. The generation method and gas properties of the combustion product gas generated at Avco-Lycoming are presented. Various gas turbine cycles for generating the laser gas were studied. Three gas production systems are considered, open- and closed-cycle operation using stored gas (the gas being generated prior to a laser run) and open-cycle operation using on-line gas generation (the laser gas being generated during the laser run). The gas storage, open-cycle system has the disadvantage of a limited duty cycle (here taken to be 50:1), but is otherwise found to be far superior in terms of weight and volume, as well as cost. (Author).
Download or read book Army Research and Development written by and published by . This book was released on 1972 with total page 666 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis ERDA Energy Research Abstracts by : United States. Energy Research and Development Administration
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration and published by . This book was released on 1977 with total page 1080 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1975 with total page 1146 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. Energy Research and Development Administration. Technical Information Center Publisher : ISBN 13 : Total Pages :1682 pages Book Rating :4.3/5 (129 download)
Book Synopsis ERDA Energy Research Abstracts by : United States. Energy Research and Development Administration. Technical Information Center
Download or read book ERDA Energy Research Abstracts written by United States. Energy Research and Development Administration. Technical Information Center and published by . This book was released on 1977 with total page 1682 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book ERDA Energy Research Abstracts written by and published by . This book was released on 1977 with total page 742 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1990 with total page 544 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 1974 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt: References and abstracts to international literature (mostly journal articles). Classified arrangement. Subject, author, and source indexes. Ser. 1, 1974: 8256 references.
Book Synopsis Experimental and Theoretical Studies of Surface and Volume Changes in Dielectrics Induced by Long-pulse RF CO2 Laser Irradiation by : A. L. Marchant
Download or read book Experimental and Theoretical Studies of Surface and Volume Changes in Dielectrics Induced by Long-pulse RF CO2 Laser Irradiation written by A. L. Marchant and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes research into infrared (IR) laser irradiation and damage of four commercially significant polymers: polyimide (PI), polyether ether ketone (PEEK), polyethylene terephthalate (PET) and polypropylene (PP). Many research groups have studied the laser ablation and irradiation of polymers, but they have focussed mainly on ultraviolet and pulsed infrared sources. There appears to be little published data for laser irradiation of polymers with IR lasers operating with pulse durations in the range 50μs to 1ms. Laser coupling to polymers is strongly dependent on the absorption coefficient at the emission wavelength. These properties are widely known and used to inform experimental practice but the absorption coefficient used in the literature is usually that measured at room temperature and low power. In this way it does not truly represent typical experimental conditions. It is also commonly assumed that the laser wavelength is constant. In this work the laser wavelength has been determined as a function of time during a typical pulse for a radio frequency (RF) excited CO2 laser. It was found that the emission wavelength could move from as short as 10.53μm to as long as 10.63μm during a 200μs duration pulse. This alone was seen to affect the absorption cofficient of the polymers studied. The absorption coefficient as a function of polymer temperature was measured over all wavelengths. This allowed any changes in the optical coupling during laser heating to be inferred. The change in absorption coefficient as a function of temperature was determined as being -0.40cm-1K-1, 0.86cm-1K-1, 0.48cm-1K-1and 0.04cm-1K-1 for PI, PEEK, PET and PP respectively at a wavelength of 10.59μm. The threshold fluence for damage was determined as a function of the laser pulse duration. Damage included any permanent change to the polymer surface and in this way took into account decomposition and melting, as well as ablation. Together with the absorption coefficient data, this allowed the energy densities to be calculated. For PI and PEEK these were found to be 2.4kJ/cm3 and 1.9kJ/cm3 respectively and agreed with existing data. The threshold energy density was 0.1kJ/cm3 for PET and 0.2kJ/cm3 for PP. These results were smaller than those expected from the literature due to melting rather than ablation taking place. The threshold fluence for each polymer was found to be mostly independent of laser pulse duration over the range investigated. The small thermal diffusivity of the materials was thought to be the reason for this. Calculations using solutions to the heat diffusion equation and a rate limited thermal decomposition model were found to be consistent with the experimental results. Some initial calculations of the effect of including the temperature dependent absorption coefficient indicated that this does indeed affect the temperature profile during and after the laser pulse. It has been shown that the RF CO2 laser is suitable for polymer processing, particularly for applications where spot size and high resolution etching are not an issue. Laser marking, cutting and hole-drilling would be acceptable applications for this laser which offers more choice in terms of duty-cycle and pulse duration than the pulsed TEA CO2 alternatives. Quantification of the thermal and optical properties and the interaction between these two parameters could be extended to other polymers and it is expected that similar behaviours would be observed.
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.
Book Synopsis Journal of Current Laser Abstracts by :
Download or read book Journal of Current Laser Abstracts written by and published by . This book was released on 1980 with total page 814 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch Publisher : ISBN 13 : Total Pages :1080 pages Book Rating :4.E/5 ( download)
Book Synopsis Japanese Science and Technology, 1983-1984 by : United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch
Download or read book Japanese Science and Technology, 1983-1984 written by United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch and published by . This book was released on 1985 with total page 1080 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Theoretical and Experimental Examination of Pulsed 16 Um CO2 Transfer Chemical Lasers by : Warren K. Jaul
Download or read book Theoretical and Experimental Examination of Pulsed 16 Um CO2 Transfer Chemical Lasers written by Warren K. Jaul and published by . This book was released on 1980 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Short Pulse Electric CO2 Laser Research by : G. S. Janes
Download or read book Short Pulse Electric CO2 Laser Research written by G. S. Janes and published by . This book was released on 1973 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: A theoretical model was developed for the CO2 laser operating in a short pumping time, gain switched, mode-locked mode of operation. This model predicted the performance of a nanosecond E-beam ionizer-sustainer laser oscillator. Additional investigations showed the possibility of providing high energy nanosecond pulses from a CO2 laser MOPA chain and predicted output energies presently achievable with devices in existence and under construction. Modifications were designed and incorporated to an existing AERL E-beam ionizer-sustainer laser and demonstrated the capability of operating the device in a gain switched mode. Further investigations and experiments under other contracts and with internal funding are in process to achieve 0.1 - 1.0 joule pulses in one nanosecond as well as amplification experiments once this output is achieved.
