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Stimulated amplification under spatially nonhomogeneous conditions: An astrophysical FeII laser in the vicinity of eta carinae

Johansson, Sveneric LU and Letokhov, Vladilen LU (2005) In Physica Scripta T120. p.99-104
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 non- equilibrium. 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 "pseudo-metastable" states ( at medium excitation) in the complex spectrum of Fe II, 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 HLy alpha radiation at a high effective temperature. In conclusion... (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 non- equilibrium. 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 "pseudo-metastable" states ( at medium excitation) in the complex spectrum of Fe II, 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 HLy 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
Physica Scripta
volume
T120
pages
99 - 104
publisher
Institute of Physics Publishing Ltd.
external identifiers
  • wos:000236907000017
  • scopus:42349106965
ISSN
0031-8949
DOI
10.1088/0031-8949/2005/T120/015
language
English
LU publication?
yes
id
0d52438b-085a-4872-b283-3fee12dbcbd1 (old id 208461)
date added to LUP
2007-08-24 14:26:06
date last changed
2017-01-01 04:37:00
@article{0d52438b-085a-4872-b283-3fee12dbcbd1,
  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 non- equilibrium. 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 "pseudo-metastable" states ( at medium excitation) in the complex spectrum of Fe II, 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 HLy 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         = {0031-8949},
  language     = {eng},
  pages        = {99--104},
  publisher    = {Institute of Physics Publishing Ltd.},
  series       = {Physica Scripta},
  title        = {Stimulated amplification under spatially nonhomogeneous conditions: An astrophysical FeII laser in the vicinity of eta carinae},
  url          = {http://dx.doi.org/10.1088/0031-8949/2005/T120/015},
  volume       = {T120},
  year         = {2005},
}