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
- Resource Type
- Authors
- Isak Silander; Patrick Ehlers; Thomas Hausmaninger; Weiguang Ma; Ove Axner
- Source
- Silander, I, Hausmaninger, T, Ma, W, Ehlers, P & Axner, O 2015, ' 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 ', Optics Letters, vol. 40, no. 9, pp. 2004-2007 . https://doi.org/10.1364/OL.40.002004
- Subject
- Heterodyne
Materials science
business.industry
Scattering
Instrumentation
Mass spectrometry
Atomic and Molecular Physics, and Optics
symbols.namesake
Finesse
Optics
Fiber laser
symbols
business
Doppler effect
health care economics and organizations
Noise (radio)
- Language
- English
- ISSN
- 1539-4794
0146-9592
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.