Energy Resonances between Molecular Species in CO2 Gas Lasers

IMPORTANT requirements for the attainment of population inversion needed in the operation of molecular gas laser systems are that population of the upper laser level and depopulation of the lower level(s) should be attained as far as possible through super-elastic collisions with impurity species 1...

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Veröffentlicht in:Nature (London) 1970-04, Vol.226 (5243), p.353-354, Article 353
1. Verfasser: NICHOLLS, R. W.
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Sprache:eng
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Zusammenfassung:IMPORTANT requirements for the attainment of population inversion needed in the operation of molecular gas laser systems are that population of the upper laser level and depopulation of the lower level(s) should be attained as far as possible through super-elastic collisions with impurity species 1 . These and other conditions 1,2 are well satisfied by CO 2 lasers operating in a number of gas mixtures 3 such as CO 2 , CO 2 -N 2 , CO 2 -N 2 -H 2 O, CO 2 -N 2 -H 2 O-He. For example, it is well known 4 that for lasers operating in CO 2 -N 2 mixtures, the close energy resonance between the metastable N 2 (X 1 Σ + g ) and the upper laser level CO 2 (X 1 Σ + g , 0, 0°, 1) provides a very efficient super-elastic collision channel for selective population of this CO 2 level. It is also possible that other low-lying vibrational levels of N 2 (X 1 Σ + ) may play similar parts.
ISSN:0028-0836
1476-4687
DOI:10.1038/226353a0