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Astrophysical Lasers$
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Vladilen Letokhov and Sveneric Johansson

Print publication date: 2008

Print ISBN-13: 9780199548279

Published to Oxford Scholarship Online: May 2009

DOI: 10.1093/acprof:oso/9780199548279.001.0001

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Basics of collisionally pumped astrophysical lasers

Basics of collisionally pumped astrophysical lasers

(p.115) 8 Basics of collisionally pumped astrophysical lasers
Astrophysical Lasers

Vladilen Letokhov

Sveneric Johansson

Oxford University Press

This chapter discusses collisionally pumped mid-IR and submillimeter masers/lasers, which form a connecting link between microwave masers and optical lasers. It reviews theoretical predictions of non-LTE situations with population inversions in atoms (ions) and molecules that were made in the 1970s and 1980s. The observations of mid-IR and submillimeter lasers were successful only for atomic hydrogen in MWC 349 (a hydrogen recombination laser) and CO2 in the Martian and Venusian atmospheres.

Keywords:   collisional pumping, ions, helium, stellar envelopes, star-forming regions, hydrogen recombination, IR lasers

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