Zeitschriftenartikel:
J. Hayden, J. Westberg, L. Patrick, B. Lendl, G. Wysocki:
"Frequency-locked cavity ring-down Faraday rotation spectroscopy";
Optics Letters,
43
(2018),
20;
S. 5046
- 5049.
Kurzfassung englisch:
Cavity ring-down Faraday rotation spectroscopy (CRD- FRS) is a technique for trace gas measurements of paramagnetic species that retrieves the molecular concentration from the polarization rotation measured as the difference between simultaneously recorded ring-down times oftwo orthogonal polarization states. The differential measurement is inherently insensitive to nonabsorber related losses, which makes off-resonance measurements redundant. We exploit this unique property by actively line-locking to a molecular transition for calibration-free trace gas concentration retrieval. In addition, we enhance the effective duty-cycle of the system by implementing a Pound-Drever-Hall laser lock to the cavity resonance, which allows for ring-down rates of up to 9 kHz. The system performance is demonstrated by measurements of trace oxygen with a minimum detection limit at the ppmv/Hz^-1/2-level.
"Offizielle" elektronische Version der Publikation (entsprechend ihrem Digital Object Identifier - DOI)
http://dx.doi.org/10.1364/OL.43.005046
Erstellt aus der Publikationsdatenbank der Technischen Universität Wien.