A DIRECT NUCLEAR PUMPED NEON-NITROGEN LASER PDF Download
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Languages : en
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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.
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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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There is provided a direct nuclear pumped gas laser in which the lasing mechanism is collisional radiated recombination of ions. The gas laser active medium is a mixture of the gases, with one example being neon and nitrogen.
Author: N. W. Jalufka
Publisher:
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Category : Nuclear induction
Languages : en
Pages : 60
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Author: N. W. Jalufka
Publisher:
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Category : Nuclear induction
Languages : en
Pages : 60
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Author: Jerry Edward Deese
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Category :
Languages : en
Pages : 244
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![Demonstration of the First Visible Wavelength Direct Nuclear Pumped Laser. [He-Hg]. PDF](https://books.google.com/books/content/images/frontcover/OCjpwQEACAAJ?fife=w80-h100)
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The first direct nuclear pumped laser to operate on a visible wavelength is described, whereas previous nuclear lasers have operated in the infrared. The Sandia Pulsed Reactor II was used as a high flux source of neutrons that pumped a helium-mercury gas laser via the high energy products of the /sup 10/B(n, .cap alpha.)/sup 7/Li nuclear reaction. No other source of energy was utilized. Lasing was observed at 6150 A, corresponding to the 7/sup 2/P/sub 3/2/--7/sup 2/S/sub /sup 1///sub 2// mercury ion transition. The thermal neutron flux threshold for lasing was approximately 1 x 10/sup 16/n/cm/sup 2/-sec, and the laser output was continuous over the 400 .mu.sec operating time of the nuclear reactor. The laser signal appeared to increase linearly with the thermal neutron flux, up to 5.8 x 10/sup 16/n/cm/sup 2/-sec, the highest flux used.
Author: Mark Prelas
Publisher: Springer
ISBN: 3319198459
Category : Technology & Engineering
Languages : en
Pages : 430
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Book Description
This book focuses on Nuclear-Pumped Laser (NPL) technology and provides the reader with a fundamental understanding of NPLs, a review of research in the field and exploration of large scale NPL system design and applications. Early chapters look at the fundamental properties of lasers, nuclear-pumping and nuclear reactions that may be used as drivers for nuclear-pumped lasers. The book goes on to explore the efficient transport of energy from the ionizing radiation to the laser medium and then the operational characteristics of existing nuclear-pumped lasers. Models based on Mathematica, explanations and a tutorial all assist the reader’s understanding of this technology. Later chapters consider the integration of the various systems involved in NPLs and the ways in which they can be used, including beyond the military agenda. As readers will discover, there are significant humanitarian applications for high energy/power lasers, such as deflecting asteroids, space propulsion, power transmission and mining. This book will appeal to graduate students and scholars across diverse disciplines, including nuclear engineering, laser physics, quantum electronics, gaseous electronics, optics, photonics, space systems engineering, materials, thermodynamics, chemistry and physics.
