Doppler-Broadened noise-immune cavity-Enhanced optical heterodyne molecular spectrometry down to 4 × 10-13 cm-1 Hz-1/2: Implementation of a 50,000 finesse cavity

I. Silander; T. Hausmaninger; Weiguang Ma; P. Ehlers; O. Axner

doi:10.1364/OL.40.002004

Doppler-Broadened noise-immune cavity-Enhanced optical heterodyne molecular spectrometry down to 4 × 10^-13 cm^-1 Hz^-1/2: Implementation of a 50,000 finesse cavity

I. Silander, T. Hausmaninger, Weiguang Ma, P. Ehlers, O. Axner

Not published at VTT

Umeå University

Research output: Contribution to journal › Article › Scientific › peer-review

25 Citations (Scopus)

Abstract

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 4×10−13 cm−1 Hz−1/2. For the 푃푒(11) transition targeted at 1.5316 μm, 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.

Original language	English
Pages (from-to)	2004-2007
Journal	Optics Letters
Volume	40
Issue number	9
DOIs	https://doi.org/10.1364/OL.40.002004
Publication status	Published - 2015
MoE publication type	A1 Journal article-refereed

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abstract = "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 4×10−13 cm−1 Hz−1/2. For the 푃푒(11) transition targeted at 1.5316 μm, 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.",

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AU - Ma, Weiguang

AU - Ehlers, P.

AU - Axner, O.

PY - 2015

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AB - 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 4×10−13 cm−1 Hz−1/2. For the 푃푒(11) transition targeted at 1.5316 μm, 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.

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Doppler-Broadened noise-immune cavity-Enhanced optical heterodyne molecular spectrometry down to 4 × 10^-13 cm^-1 Hz^-1/2: Implementation of a 50,000 finesse cavity

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