Gain calculation of He-like Mg soft x-ray laser

Dalwoo Kim

doi:10.1117/12.2316279

1 September 1996 Gain calculation of He-like Mg soft x-ray laser

Dalwoo Kim

Proceedings Volume 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology; 2778GE (1996) https://doi.org/10.1117/12.2316279
Event: 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 1996, Taejon, Korea, Republic of

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.

Citation Download Citation

Dalwoo Kim "Gain calculation of He-like Mg soft x-ray laser", Proc. SPIE 2778, 17th Congress of the International Commission for Optics: Optics for Science and New Technology, 2778GE (1 September 1996); https://doi.org/10.1117/12.2316279

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