Use of etalon-immune distances to reduce the influence of background signals in frequency-modulation spectroscopy and noise-immune cavity-enhanced optical heterodyne molecular spectroscopy

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Ehlers, Patrick,1981-Umeå universitet,Institutionen för fysik,Laser physics group (författare)

Use of etalon-immune distances to reduce the influence of background signals in frequency-modulation spectroscopy and noise-immune cavity-enhanced optical heterodyne molecular spectroscopy

Artikel/kapitelEngelska2014

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2014
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LIBRIS-ID:oai:DiVA.org:umu-92503
https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-92503URI
https://doi.org/10.1364/JOSAB.31.002938DOI

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Språk:engelska
Sammanfattning på:engelska

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Included in theses in manuscript form with the title: "On the use of etalon-immune-distances to reduce the influence of background signals in frequency modulation spectroscopy and NICE-OHMS"
The detection sensitivity of phase-modulated techniques such as frequency-modulation spectroscopy (FMS) and noise-immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) is often limited by etalon background signals. It has previously been shown that the impact of etalons can be reduced by the use of etalon-immune distances (EIDs), i.e., by separating the surfaces that give rise to etalons by a distance of q. L-m, where L-m is given by c/2n nu(m), where, in turn, n and nu(m) are the index of refraction between the components that make up the etalon (thus most often that of air) and the modulation frequency, respectively, and where q is an integer (i.e., 1, 2, 3,.) or half-integer (i.e., 1/2, 1, 3/2,.) for the dispersion and absorption modes of detection, respectively. An etalon created by surfaces separated by an EID will evade detection and thereby not contribute to any background signal. The concept of EIDs in FMS and NICE-OHMS is in this work demonstrated, scrutinized, and discussed in some detail. It is shown that the influence of EIDs on the absorption and dispersion modes of detection is significantly different; signals detected at the dispersion phase are considerably less sensitive to deviations from exact EID conditions than those detected at the absorption phase. For example, the FM background signal from an etalon whose length deviates from an EID by 2.5% of L-m (e.g., by 1 cm for an L-m of 40 cm), detected in dispersion, is only 9% of that in absorption. This makes the former mode of detection the preferred one whenever a sturdy immunity against etalons is needed or when optical components with parallel surfaces (e.g., lenses, polarizers, or beam splitters) are used. The impact of the concept of EIDs on NICE-OHMS is demonstrated by the use of Allan-Werle plots.

Ämnesord och genrebeteckningar

NATURVETENSKAP Fysik Atom- och molekylfysik och optik hsv//swe
NATURAL SCIENCES Physical Sciences Atom and Molecular Physics and Optics hsv//eng
fysik
Physics

Biuppslag (personer, institutioner, konferenser, titlar ...)

Johansson, Alexandra C,1987-Umeå universitet,Institutionen för fysik(Swepub:umu)aljo0004 (författare)
Silander, Isak,1980-Umeå universitet,Institutionen för fysik(Swepub:umu)issi0002 (författare)
Foltynowicz, Aleksandra,1981-Umeå universitet,Institutionen för fysik(Swepub:umu)alafoz03 (författare)
Axner, Ove,1957-Umeå universitet,Institutionen för fysik(Swepub:umu)ovax0001 (författare)
Umeå universitetInstitutionen för fysik (creator_code:org_t)

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Ingår i:Journal of the Optical Society of America. B, Optical physics31:12, s. 2938-29450740-32241520-8540

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Av författaren/redakt...: Ehlers, Patrick, ...; Johansson, Alexa ...; Silander, Isak, ...; Foltynowicz, Ale ...; Axner, Ove, 1957 ...

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Av lärosätet: Umeå universitet

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