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Wavelength modulated noise-immune cavity-enhanced optical heterodyne molecular spectroscopy signal line shapes in the Doppler limit
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- Foltynowicz, Aleksandra, 1981- (author)
- Umeå universitet,Institutionen för fysik,Laser Physics Group
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- Ma, Weiguang (author)
- Umeå universitet,Institutionen för fysik
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- Schmidt, Florian M (author)
- Umeå universitet,Institutionen för fysik
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- (creator_code:org_t)
- 2009
- 2009
- English.
- In: Journal of the Optical Society of America. B, Optical physics. - 0740-3224 .- 1520-8540. ; 26:7, s. 1384-1394
- Journal article (peer-reviewed)
Abstract
Subject headings
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- A thorough analysis of the shape and strength of Doppler-broadened wavelength modulated noise-immune cavity-enhanced optical heterodyne molecular spectroscopy signals is presented and their dependence on modulation frequency, modulation amplitude and detection phase is investigated in detail. The conditions that maximize the on-resonance signal are identified. The analysis is based on the standard frequency modulation spectroscopy formalism and the Fourier description of wavelength modulation spectroscopy and verified by fits to experimental signals from C2H2 and CO2 measured at 1531 nm. In addition, the line strengths of two CO2 transitions in the v2→3v1+v2+v3 hot band [Pe(7) and Pe(9)] were found to differ by ~20% from those given in the HITRAN database.
Subject headings
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Keyword
- heterodyne spectroscopy
- modulation spectroscopy
- absorption
- line shapes and shifts
- cavity enhanced spectroscopy
Publication and Content Type
- ref (subject category)
- art (subject category)
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