Effects of unresolved satellite lines on lasing of extreme ultraviolet light with nitrogen plasma in a recombining phase

Journal Article · Thu Aug 15 04:00:00 EDT 2013 · Physics of Plasmas

DOI:https://doi.org/10.1063/1.4819022· OSTI ID:22220682

Tatsumura, Nao; Yamamura, Shuhei; Ozawa, Takuya; Horioka, Kazuhiko; Kawamura, Tohru ^[1]

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1. 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, Journal Name: Physics of Plasmas Journal Issue: 8 Vol. 20; ISSN PHPAEN; ISSN 1070-664X
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ELECTRONS
EXCITED STATES
EXTREME ULTRAVIOLET RADIATION
GAIN
LANTHANUM SELENIDES
LASERS
NITROGEN
PLASMA DENSITY
POPULATION INVERSION
STIMULATED EMISSION
VISIBLE RADIATION