Small, High Repetition-Rate HF and DF Lasers PDF Download
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Author: Walter A. Riessler
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
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Book Description
Measurements are presented of the multiline spectral output, output power as a function of pulse-repetition rate, and V-I (voltage-current) characteristics of small pulsed hydrogen fluoride (HF) and deuterium fluoride (DF) lasers that have been operated at repetition rates up to 1 kHz. Results indicate that observed reductions in output power at high repetition rates are due to an insufficient gas flow that (1) allows the ground state population to build up, (2) reduces population inversion between the first vibrational state and the ground state, and (3) introduces discharge instabilities that severely limit the pulse-rate capabilities. Average powers are reported to vary linearly with pulse-repetition rate up to 400 Hz, with typical pulse energies of 10 and 4 mJ for small HF and DF lasers respectively with discharge lengths of only 10 cm. (Author).
Author: Walter A. Riessler
Publisher:
ISBN:
Category :
Languages : en
Pages : 27
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Book Description
Measurements are presented of the multiline spectral output, output power as a function of pulse-repetition rate, and V-I (voltage-current) characteristics of small pulsed hydrogen fluoride (HF) and deuterium fluoride (DF) lasers that have been operated at repetition rates up to 1 kHz. Results indicate that observed reductions in output power at high repetition rates are due to an insufficient gas flow that (1) allows the ground state population to build up, (2) reduces population inversion between the first vibrational state and the ground state, and (3) introduces discharge instabilities that severely limit the pulse-rate capabilities. Average powers are reported to vary linearly with pulse-repetition rate up to 400 Hz, with typical pulse energies of 10 and 4 mJ for small HF and DF lasers respectively with discharge lengths of only 10 cm. (Author).
Author: T. V. Jacobson
Publisher:
ISBN:
Category :
Languages : en
Pages : 3
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Book Description
An HF chemical laser with a 10-cm-long active volume has been constructed for operation at high pulse repetition rates using TE excitation. Up to 7.2 W of quasi-CW power were produced at 1100 Hz. Powers as high as 160 mW were obtained on a single transition when the cavity was line tuned. The effect of sequential or cascade lasing was observed. (Author).
Author: Victor V. Apollonov
Publisher: CRC Press
ISBN: 1000066177
Category : Science
Languages : en
Pages : 226
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Book Description
This book explores new principles of Self-Initiating Volume Discharge for creating high-energy non-chain HF(DF) lasers, as well as the creation of highly efficient lasers with output energy and radiation power in the spectral region of 2.6–5 μm. Today, sources of high-power lasing in this spectral region are in demand in various fields of science and technology including remote sensing of the atmosphere, medicine, biological imaging, precision machining and other special applications. These applications require efficient laser sources with high pulse energy, pulsed and average power, which makes the development of physical fundamentals of high-power laser creation and laser complexes of crucial importance. High-Energy Ecologically Safe HF/DF Lasers: Physics of Self-Initiated Volume Discharge-Based HF/DF Lasers examines the conditions of formation of SSVD, gas composition and the mode of energy input into the gas on the efficiency and radiation energy of non-chain HF(DF) lasers. Key Features: Shares research results on SSVD in mixtures of non-chain HF(DF) lasers Studies the stability and dynamics of the development of SSVD Discusses the effect of the gas composition and geometry of the discharge gap (DG) on its characteristics Proposes recommendations for gas composition and for the method of obtaining SSVD in non-chain HF(DF) lasers Develops simple and reliable wide-aperture non-chain HF(DF) lasers and investigates their characteristics Investigates the possibilities of expanding the lasing spectrum of non-chain HF(DF) lasers
Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 960
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: R. I. Rudko
Publisher:
ISBN:
Category :
Languages : en
Pages : 102
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Book Description
This study deals with a high-repetition-rate multispectral laser source providing simultaneous emission on many lines in the 2.5-3.0 micron, 3.5-4.0 micron, and 4.3-5.0 micron regions. This program was an experimental investigation to assess the operational characteristics of compact, high-repetition-rate mid-infrared laser sources capable of multispectral operation. An HF/DF/HBr, electrically-initiated TE chemical laser was originally selected as a good candidate for such a system. HBr was found not to be a suitable laser medium for a small system, owing to its low gain. An HF-laser-pumped, isotopic CO2 laser was selected to replace it and to cover the 4.3-5.0 micron region. This laser was investigated in an extension of the original contract. The HF/DF chemical laser was capable of sustaining up to 10,000 discharges per second in gas mixtures containing SF6 and, separately or jointly, H2 and D2. Over 1 millijoule per pulse outputs were obtained up to 4,200 pps in HF, weaker outputs being still available even at the 10,000 pps repetition rate. Peak average powers were 4.5 W for HF and 2.0 W for DF lasers. The laser was operated in a recirculating mode to make efficient use of the reactant gases. Chemical scrubbers were used to remove the discharge and reaction products, thus improving laser performance. Atmospheric pressure operation of this system was also achieved.
Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 820
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Book Description
Author: Fiona Elizabeth Thorburn
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Colin Webb
Publisher: CRC Press
ISBN: 1482240777
Category : Mathematics
Languages : en
Pages : 1266
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Book Description
The invention of the laser was one of the towering achievements of the twentieth century. At the opening of the twenty-first century we are witnessing the burgeoning of the myriad technical innovations to which that invention has led. The Handbook of Laser Technology and Applications is a practical and long-lasting reference source for scientists and engineers who work with lasers. The Handbook provides, a comprehensive guide to the current status of lasers and laser systems; it is accessible to science or engineering graduates needing no more than standard undergraduate knowledge of optics. Whilst being a self-contained reference work, the Handbook provides extensive references to contemporary work, and is a basis for studying the professional journal literature on the subject. It covers applications through detailed case studies, and is therefore well suited to readers who wish to use it to solve specific problems of their own. The first of the three volumes comprises an introduction to the basic scientific principles of lasers, laser beams and non-linear optics. The second volume describes the mechanisms and operating characteristics of specific types of laser including crystalline solid - state lasers, semiconductor diode lasers, fibre lasers, gas lasers, chemical lasers, dye lasers and many others as well as detailing the optical and electronic components which tailor the laser's performance and beam delivery systems. The third volume is devoted to case studies of applications in a wide range of subjects including materials processing, optical measurement techniques, medicine, telecommunications, data storage, spectroscopy, earth sciences and astronomy, and plasma fusion research. This vast compendium of knowledge on laser science and technology is the work of over 130 international experts, many of whom are recognised as the world leaders in their respective fields. Whether the reader is engaged in the science, technology, industrial or medical applications of lasers or is researching the subject as a manager or investor in technical enterprises they cannot fail to be informed and enlightened by the wide range of information the Handbook supplies.
Author: Colin E. Webb
Publisher: CRC Press
ISBN: 9780750309639
Category : Technology & Engineering
Languages : en
Pages : 1282
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Book Description
Author: Victor Apollonov
Publisher: Springer
ISBN: 3030029522
Category : Science
Languages : en
Pages : 326
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Book Description
This book discusses the physics of conductive channel development in space, air and vacuums and summarizes the attempts to create super-long conductive channels to study the upper atmosphere and to complete specific tasks related to energy transmission from the space to earth with high-voltage high repetition rate electrical sources. Conductive channels are produced by the laser jet engine vehicle-propulsion under the influence of powerful high repetition rate pulse-periodic laser radiation by CO2-laser, solid state Nd YAG,HF/DF laser systems generated with each pulse of the powerful laser conductive dust plasma. The book also presents the experimental and theoretical results of conductive canal modeling: the laser jet engine vehicle “Impulsar”, which can reach the lower layers of the ionosphere in several hundred seconds. Further, the book explores the development of lightning protection systems. The so-called long laser spark is generated to provide the conditions for connecting a thunderstorm cloud with a grounded metal rod, i.e. a classical lightning rod. Such conductivity channels can be used for energy transmission, overvoltage protection systems, transport of charged particle beams and plasma antennas. It provides the theoretical and experimental basis of high repetition rate P-P mode of operation for high power lasers (COIL, HF/DF, CO2,Nd YAG). It describes high efficiency and excellent beam quality disk lasers used for numerous applications, including surface treatment of dielectric materials in microelectronics, cutting, drilling, welding, polishing and cleaning of the surface and other technological operations. Lastly it investigates how megawatt mono-module disk lasers could be used to solve various problems: small satellites launched by lasers, formation of super-long conducting channels in space and atmosphere, cleaning of the near-earth space from the space debris and related applications.
