Doppler-broadened noise-immune cavity-enhanced optical heterodyne molecular spectrometry down to 4 x 10-13 cm-1 Hz-1/2: implementation of a 50,000 finesse cavity
2015 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 40, no 9, 2004-2007 p.Article in journal (Refereed) Published
We report on the realization of a Doppler-broadened noise-immune cavity-enhanced optical heterodyne molecular spectrometry (NICE-OHMS) instrumentation based on a high-finesse (50,000) cavity with a detection sensitivity of 4 x 10(-13) cm(-1) Hz(-1/2). For the P-e(11) transition targeted at 1.5316 mu m, this corresponds to a C2H2 concentration of 240 ppq (parts-per-quadrillion) detected at 100 Torr. The setup was originally affected by recurrent dips in the cavity transmission, which were attributed to excitation of high-order transverse mode by scattering from the mirrors. The effect of these was reduced by insertion of a small pinhole in the cavity.
Place, publisher, year, edition, pages
Optical Society of America, 2015. Vol. 40, no 9, 2004-2007 p.
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:umu:diva-106284DOI: 10.1364/OL.40.002004ISI: 000353924600031PubMedID: 25927769OAI: oai:DiVA.org:umu-106284DiVA: diva2:841002