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Languages : en
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The neon-nitrogen laser has generated considerable interest having been pumped directly by nuclear radiation. Lasing was observed on two transitions of atomic N, the 3p/sup 2/ P/sub 3//sup 0/ .-->. 3s/sup 2/ P/sub 3/ (8629.24 A) and the 3p/sup 2/ D/sub 5//sup 0/ .-->. 3s/sup 2/ P/sub 3/ (9392.79 A). The Ne-N/sub 2/ system also lases in an afterglow of an electrical discharge, which has similar characteristics to a nuclear radiation generated plasma. In order to determine the physical processes for pumping this laser, a detailed study of the afterglow system has been performed. The pumping mechanism has been found to be collisional-radiative electron-ion recombination. Microwave quenching of both the laser and spontaneous afterglow light has shown conclusively that a recombination process directly produces a nitrogen atom in either the upper laser level or, more likely, in a higher lying energy level which rapidly de-excites to the upper laser level. Studies of the temperature dependence of the recombination coefficient indicate a collisional-radiative process allowing the recombining ion to be tentatively identified as N/sup +/. Since this process is highly compatible with the reactor produced plasma, it is not unreasonable to assume that this recombination process is also the pumping mechanism in the nuclear excited case.
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Languages : en
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It is well established that lasing of atomic nitrogen and carbon can be obtained during the afterglow of an electrical discharge in gas mixtures of either neon or helium containing low partial pressures of N/sub 2/ or CO. In addition, the neon-nitrogen laser has recently been pumped directly by nuclear radiation. Microwave quenching experiments have shown conclusively that the afterglow lasers are being pumped directly by the recombination of electron-ion pairs. This result differs from the mechanisms previously proposed for these systems. Measurements comparing the relative sensitivity to the electron temperature of the neon to atomic nitrogen and carbon afterglow light infer that the recombination process pumping these lasers is collisional-radiative, allowing the recombining ions to be identified as N/sup +/ and C/sup +/. Since this process is highly compatible with nuclear-radiation generated plasmas, it is not unreasonable to infer that this process is also the pumping mechanism in the nuclear-excited, neon-nitrogen laser.
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Languages : en
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Author: Marvin J. Weber
Publisher: CRC Press
ISBN: 1420050176
Category : Technology & Engineering
Languages : en
Pages : 1224
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Lasers continue to be an amazingly robust field of activity. Anyone seeking a photon source is now confronted with an enormous number of possible lasers and laser wavelengths to choose from, but no single, comprehensive source to help them make that choice. The Handbook of Lasers provides an authoritative compilation of lasers, their properties, and original references in a readily accessible form. Organized by lasing media-solids, liquids, and gases-each section is subdivided into distinct laser types. Each type carries a brief description, followed by tables listing the lasing element or medium, host, lasing transition and wavelength, operating properties, primary literature citations, and, for broadband lasers, reported tuning ranges. The importance and value of the Handbook of Lasers cannot be overstated. Serving as both an archive and as an indicator of emerging trends, it reflects the state of knowledge and development in the field, provides a rapid means of obtaining reference data, and offers a pathway to the literature. It contains data useful for comparison with predictions and for developing models of processes, and may reveal fundamental inconsistencies or conflicts in the data.
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Category : Aeronautics
Languages : en
Pages : 836
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Category : Power resources
Languages : en
Pages : 1744
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Category : Lasers
Languages : en
Pages : 840
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Languages : en
Pages :
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A new neutron-driven laser that utilizes a boron-10 coating, Ne-N/sub 2/ gas, and provides simultaneous output at 8629 and 9393 A in nitrogen is described. The laser has several distinctive features; namely, the neutron flux i.e., power input at threshold requirement is the lowest reported to date for nuclear pumping and the wavelengths fall into an attractive region in the near infrared.
Author: United States. Energy Research and Development Administration. Technical Information Center
Publisher:
ISBN:
Category : Force and energy
Languages : en
Pages : 1680
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Category :
Languages : en
Pages : 640
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