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Proceedings Paper

Gain calculation of He-like Mg soft x-ray laser
Author(s): Dalwoo Kim
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Paper Abstract

In this paper, we have studied the He-like soft x-ray laser in a magnesium microtube target pumped by a short laser pulse. This target configuration could simplify the irradiating system, reduce the pumping power and improve the efficiency of energy absorption. In addition, this target configuration could converge the plasma, therefore the electron density will keep high after the plasma expansion, which is favorable to high gain. We chose He-like sequence ion other than the usual H-, Li-, or Na-like ones as the medium based on the reason that the unique shell structure of He-like ion is favorable to both three body recombination and electron collision pumping. At early time, population inversions take place when H-like ions become He-like ones through three body recombination when the plasma rapidly expands and cools. Later on, as lasing occurs, population inversions are consumed, but they can be replenished by the contribution of electron collision pumping due to the full shell structure of He-like ion, which is similar to that in Ne-like circumstance, therefore high gain is expected. In addition to the confirmation by a simple analytical hydrodynamic model[1], Charatis et al.'s experimental results[2] also support our conjecture.

Paper Details

Date Published: 1 September 1996
PDF: 2 pages
Proc. SPIE 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 2778GE (1 September 1996); doi: 10.1117/12.2316279
Show Author Affiliations
Dalwoo Kim, Research Institute of Industrial Science and Technology (Korea, Republic of)


Published in SPIE Proceedings Vol. 2778:
17th Congress of the International Commission for Optics: Optics for Science and New Technology
Joon-Sung Chang; Jai-Hyung Lee; ChangHee Nam, Editor(s)

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