Population Inversion and Threshold Condition for Laser Oscillation in Optically Thin and Thick Recombining Plasmas

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概要

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• Overpopulation density Δn_<ij> which is defined as difference between the population densities per unit statistical weight of the upper and lower excited levels i and j is calculated as a function of the electron density n_e for various electron temperatures T_e in recombining hydrogen plasmas. The calculation is made for the line pairs with the principal quantum numbers, (2,3), (3,4) and (4,5). Effect of the ground level population density n_l on Δn_<ij> is calculated. In this calculation the atom-atom collision and the self-absorption of the resonance lines are taken account of. The n_l-dependence of Δn_<ij> remains almost constant until the self-absorption becomes significant. When n_1 is zero, an optimum value of n_e exists for Δn_<ij>. The threshold condition for laser oscillation is discussed in relation to the calculated Δn_<ij>. Laser oscillation is possible for the line pair (2,3) at an electron density and temperature higher than for the other pairs (3,4) and (4,5) when the self=absorption is negligible.

• 核融合科学研究所の論文

著者

• Oda Toshiatsu

  Research Information Center Institute Of Plasma Physics Nagoya University:department Of Applied Phys

• Furukane Utaro

  Research Information Center Institute Of Plasma Physics Nagoya University:department Of Physics Coll

• Oda Toshiatsu

  Research Information Center Institute Of Plasma Physics Nagoya University:faculty Of Science Hiroshima University

関連論文

• The Optimum Condition of TPD-I Recombining Helium Plasma for VUV Coherent Lasing Action
• Population Inversion between the Ground State and the First Excited State in a Recombining Hydrogen Plasma
• Gas-Contact Cooling for VUV Laser Oscillation in Recombining Plasmas
• Population Inversion in a Recombining Hydrogen Plasma Interacting with a Helium Gas
• The Behaviour of Population in a Plasma Interacting with an Atomic Gas
• Population Inversion in an Optically Thick Recombining Hydrogen Plasma
• Population Inversion in Recombining Hydrogen Plasma
• Population Inversion and Threshold Condition for Laser Oscillation in Optically Thin and Thick Recombining Plasmas

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