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- Johansson, SvenericLund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science (author)
Stimulated amplification in an astrophysical plasma: An FeII space laser in gas condensation in the vicinity of eta carinae
- Article/chapterEnglish2005
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- 2005
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- LIBRIS-ID:oai:lup.lub.lu.se:1ffcf22f-6875-4aab-afb4-1a08fded2133
- https://lup.lub.lu.se/record/231990URI
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- Language:English
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- 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.
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- Letokhov, VladilenLund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science(Swepub:lu)fysi-vle (author)
- Astronomi - Genomgår omorganisationInstitutionen för astronomi och teoretisk fysik - Genomgår omorganisation (creator_code:org_t)
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- In:Laser Physics15:7, s. 939-9461054-660X
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