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  • Other Sources  (5)
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  • 1
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    Recombination lasing in a magnetoplasmadynamic arcjet (1980)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The plasmadynamic recombination laser concept is verified experimentally in a high-power quasisteady MPD arcjet operating at 4 kA and 12 g/sec of argon. Measurements of the spatial variation of electron temperature, electron density, and population densities in the arc exhaust flow confirm that inverted populations of the 4p to 4s Ar II transitions are established by collisional-radiative recombination of the Ar III ion. Using an optical cavity aligned transversely to the flow, recombination lasing of seven such transitions, 5145, 4880, 4764, 4727, 4658, 4579, and 4545 A, is observed spectrophotographically and photoelectrically over the entire 1-msec discharge.
    Keywords: PLASMA PHYSICS
    Type: Journal of Applied Physics; 51; Jan. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Recombination lasing in a magnetoplasmadynamic arcjet (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The plasmadynamic recombination laser concept is verified experimentally in a high-power quasisteady MPD arcjet operating at 4 kA and 12 g/sec of argon. Measurements of the spatial variation of electron temperature, electron density, and population densities in the arc exhaust flow confirm that inverted populations of the 4p to 4s ArII transitions are established by collisional-radiative recombination of the ArIII ion. Using an optical cavity aligned transversely to the flow, recombination lasing of four such transitions, 5145, 4880, 4764, and 4727 A, is observed spectrophotographically and photoelectrically over the entire 1-msec discharge.
    Keywords: LASERS AND MASERS
    Type: Applied Physics Letters; 30; June 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The MPD arc as a plasmadynamic laser source (1976)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The paper reports results of measurements of local plasma properties (electron density and temperature, radiance, and population density) in the recombining plasma flow of a high power (100 kW) quasi-steady MPD arc designed as a plasmadynamic laser source. The profiles of electron density and temperature and the populations of excited states of Ar II show large deviations from LTE and indicate the existence of population inversions between the 4d and 4p states.
    Keywords: LASERS AND MASERS
    Type: International Symposium on Gasdynamic and chemical lasers; Oct 11, 1976 - Oct 15, 1976; Cologne; Germany
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
    facet.materialart.
    Unknown
    Recombination lasing in a magnetoplasmadynamic arcjet (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The plasmadynamic recombination laser concept is verified experimentally in a high power quasi-steady MPD arcjet operating at 4 kA and 12 g/sec of argon. Measurements of the spatial variation of electron temperature, electron density, and population densities in the arc exhaust flow confirm that inverted populations of the 4p to 4s Ar II transitions are established by collisional-radiative recombination of the Ar III ion. Using an optical cavity aligned transversely to the flow, recombination lasing of four such transitions, 5145, 4880, 4764 and 4727 A, is observed spectro-photographically and photoelectrically over the entire 1-msec discharge.
    Keywords: PLASMA PHYSICS
    Type: AIAA PAPER 77-242 , Aerospace Sciences Meeting; Jan 24, 1977 - Jan 26, 1977; Los Angeles, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Laser processes in plasmadynamic flows (1975)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Radiation emitted from the exhaust flow of a multi-megawatt, quasi-steady magnetoplasmadynamic accelerator has been examined photoelectrically for argon mass flows from 6 to 32 g/sec and arc currents up to 25 kA. Vacuum ultraviolet radiation, indicative of resonance transitions, has been detected photoelectrically at various axial locations downstream of the arc chamber, consistent with a relaxation length calculated using a collisional-radiative recombination model. Photoelectric measurements of particular transitions in the neutral and first ionic state of argon show that populations of excited electronic states of AII are in excess of that which would be expected on the basis of Saha-Boltzmann equilibrium at the local electron temperature and number density. Optical depth measurements indicate that for a current of 4 kA and argon mass flow of 12 g/sec, a population inversion exists between the upper and lower states of the 0.4880 micron argon ion transition.
    Keywords: PLASMA PHYSICS
    Type: AIAA PAPER 75-852 , American Institute of Aeronautics and Astronautics, Fluid and Plasma Dynamics Conference; Jun 16, 1975 - Jun 18, 1975; Hartford, CT
    Format: text
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    NASA TECHNICAL REPORTS
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