Laser action in stellar envelopes | Zendy

Y. P. Varshni | Zendy; Raied M. Nasser | Zendy

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Laser action in stellar envelopes

Author(s) -

Y. P. Varshni,

Raied M. Nasser

Publication year - 1986

Publication title -

astrophysics and space science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.398

H-Index - 75

eISSN - 1572-946X

pISSN - 0004-640X

DOI - 10.1007/bf00648033

Subject(s) - physics , astrophysics , stars , laser , population inversion , astronomy , helium , population , emission spectrum , cosmology , line (geometry) , atomic physics , spectral line , optics , demography , geometry , mathematics , sociology

Model calculations for laser action in Hei are carried out, when helium plasma is rapidly cooled by expansion. Results are presented for four transitions, two of which, 31S→21P0 (λ7281) and 31D→21P0 (λ6678), show strong population inversion. Available observational evidence for possible laser action in these two lines in Wolf-Rayet and emission-line stars is summarized and discussed.

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