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Stimulated amplification in an astrophysical plasma: An FeII space laser in gas condensation in the vicinity of eta carinae

Johansson, Sveneric LU and Letokhov, Vladilen LU (2005) In Laser Physics 15(7). p.939-946
Abstract
We consider the conditions necessary for the development of an inverted population among the energy levels of free atoms in a medium exposed to radiation in spectral nonequilibrium. In particular, we focus on monochromatic radiation occurring as a result of an accidental wavelength coincidence between a pumping emission line and a pumped absorption line in two different elements. We examine especially the influence of "pseudometastable" states (at medium excitation) in the complex spectrum of Fe 11, which cause a "bottleneck" in the radiative decay leading to an inverted level population. We also discuss the effect of spectral compression of the Lyman continuum into H Ly-alpha radiation at a high effective temperature. In conclusion, we... (More)
We consider the conditions necessary for the development of an inverted population among the energy levels of free atoms in a medium exposed to radiation in spectral nonequilibrium. In particular, we focus on monochromatic radiation occurring as a result of an accidental wavelength coincidence between a pumping emission line and a pumped absorption line in two different elements. We examine especially the influence of "pseudometastable" states (at medium excitation) in the complex spectrum of Fe 11, which cause a "bottleneck" in the radiative decay leading to an inverted level population. We also discuss the effect of spectral compression of the Lyman continuum into H Ly-alpha radiation at a high effective temperature. In conclusion, we describe those differences between microwave astrophysical masers (APM) and optical astrophysical lasers (APL) that make the latter a more rare phenomenon in nature. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Laser Physics
volume
15
issue
7
pages
939 - 946
publisher
Interperiodica
external identifiers
  • wos:000230682100003
ISSN
1054-660X
language
English
LU publication?
yes
id
1ffcf22f-6875-4aab-afb4-1a08fded2133 (old id 231990)
date added to LUP
2007-08-24 14:29:25
date last changed
2016-04-16 03:08:11
@article{1ffcf22f-6875-4aab-afb4-1a08fded2133,
  abstract     = {We consider the conditions necessary for the development of an inverted population among the energy levels of free atoms in a medium exposed to radiation in spectral nonequilibrium. In particular, we focus on monochromatic radiation occurring as a result of an accidental wavelength coincidence between a pumping emission line and a pumped absorption line in two different elements. We examine especially the influence of "pseudometastable" states (at medium excitation) in the complex spectrum of Fe 11, which cause a "bottleneck" in the radiative decay leading to an inverted level population. We also discuss the effect of spectral compression of the Lyman continuum into H Ly-alpha radiation at a high effective temperature. In conclusion, we describe those differences between microwave astrophysical masers (APM) and optical astrophysical lasers (APL) that make the latter a more rare phenomenon in nature.},
  author       = {Johansson, Sveneric and Letokhov, Vladilen},
  issn         = {1054-660X},
  language     = {eng},
  number       = {7},
  pages        = {939--946},
  publisher    = {Interperiodica},
  series       = {Laser Physics},
  title        = {Stimulated amplification in an astrophysical plasma: An FeII space laser in gas condensation in the vicinity of eta carinae},
  volume       = {15},
  year         = {2005},
}