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Chirped quantum cascade laser induced rapid passage signatures in an optically thick gas

Abstract:

We report observations of rapid passage signals induced in samples of N2O and CH4 present in a multipass cell with an optical path length of 5 m. The effect of laser power and chirp rate upon the signals has been studied by utilising two different chirped quantum cascade lasers operating around 8 μm. The rapid passage signals exhibit an increasing delay in the switch from absorption to emission as a function of increased gas pressure (up to 8 Torr of gas). By comparing a selection of transiti...

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Publisher copy:
10.1007/s00340-010-4159-7

Authors


Northern, JH More by this author
Ritchie, GAD More by this author
Smakman, EP More by this author
Van Helden, JH More by this author
Walker, RJ More by this author
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Journal:
Applied Physics B: Lasers and Optics
Volume:
102
Issue:
1
Pages:
37-42
Publication date:
2011-01-05
DOI:
ISSN:
0946-2171
URN:
uuid:d41cd2a3-8d8b-49a2-a5a3-aa3ea108cbbb
Source identifiers:
127493
Local pid:
pubs:127493
Language:
English

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