Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pasp..115.1375j&link_type=abstract
The Publications of the Astronomical Society of the Pacific, Volume 115, Issue 814, pp. 1375-1382.
Astronomy and Astrophysics
Astronomy
2
Atomic Processes, Ism: Masers, Line: Formation, Radiation Mechanisms: Nonthermal
Scientific paper
In this paper we consider a general problem of astrophysical lasers operating with optical pumping by accidental resonance (PAR) with strong spontaneous emission lines of other elements. The origin of population inversion and the coefficient of amplification due to the optical excitation of atoms (ions) by a four-level scheme with PAR are analyzed. We elucidate conclusively the question of the manifestation of astrophysical lasers in the optical region of the spectrum, which in principle differs from that of astrophysical masers in the microwave range.
Johansson Sara
Letokhov V. S.
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