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Doppler-broadened f...
Doppler-broadened fiber-laser-based NICE-OHMS : improved detectability
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- Schmidt, Florian (författare)
- Umeå universitet,Institutionen för fysik
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- Foltynowicz-Matyba, Aleksandra, 1981- (författare)
- Umeå universitet,Institutionen för fysik
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- Ma, Weiguang (författare)
- Umeå universitet,Institutionen för fysik
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Lock, Tomas (författare)
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- Axner, Ove (författare)
- Umeå universitet,Institutionen för fysik
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(creator_code:org_t)
- 2007
- 2007
- Engelska.
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Ingår i: Optics Express. - 1094-4087. ; 15:17, s. 10822-10831
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The performance of fiber-laser-based noise-immune cavity-enhanced optical heterodyne molecular spectrometry (NICE-OHMS) has been improved by elimination of the technical constraints that limited its first demonstration. Doppler-broadened detection of C2H2 and CO2 at ~1531 nm is demonstrated using a cavity with a finesse of 4800. Frequency and wavelength modulated detection at absorption and dispersion phase are compared and the optimum mode of detection is discussed. A minimum detectable absorption of 8 × 10-11 cm-1, which corresponds to a detection limit of 4.5 ppt (2 ppt·m) for C2H2, was obtained for an acquisition time of 0.7 s by lineshape fitting. The linearity of the pressure dependence of the signal strengths is investigated for both C2H2 and CO2.
Ämnesord
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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