Effects of unresolved satellite lines on lasing of extreme ultraviolet light with nitrogen plasma in a recombining phase
- Department of Energy Sciences, Tokyo Institute of Technology, Nagatsuta 4259, Midori, Yokohama, Kanagawa (Japan)
Satellite lines with a high-lying spectator electron give unresolved spectral feature with respect to a parent resonance line. In our previous study [T. Ozawa et al., Phys. Plasmas 19, 063302 (2012)], population inversion between 3l and 2l of hydrogenlike nitrogen in a recombining phase was quantitatively estimated and the dielectronic-capture ladderlike processes, which implicitly include such doubly excited states as nln′l′ (n=2−4,n′≫n), were found to be indispensable in the estimation of a gain. In this study, the population densities of the doubly excited states are explicitly calculated by a time-dependent collisional-radiative model with desired plasma conditions for the lasing of nitrogen Balmer-α, which is a parent resonance line of unresolved satellite lines 3ln′l′→2ln′l′. The stimulated emission of the unresolved satellite lines caused by Balmer-α is found to reduce the population inversion between 3l and 2l, leading to essential saturation of the amplification of Balmer-α laser light.
- OSTI ID:
- 22220682
- Journal Information:
- Physics of Plasmas, Vol. 20, Issue 8; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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