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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

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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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