Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Long-term stability in continuous wave cavity ringdown spectroscopy experiments

Not Accessible

Your library or personal account may give you access

Abstract

Allan variance has been used to characterize the slow drift of a near-IR distributed feedback laser-based continuous wave cavity ringdown spectroscopy (CW-CRDS) system. Long-term drift in the cavity loss rate, highly correlated with changes in ambient pressure but not temperature, is observed. With differential measurement of on- and off-peak decay rates, the drift between them largely cancels out, but some residual drift remains if the lasers are detuned more than a few hundred megahertz from each other. A sensitivity to bulk cavity loss (1σ) of 4.4×1012cm1 has been obtained during an optimum integration time of 30  min with our CW-CRDS setup, which corresponds to the methane detection limit (3σ) in N2 of 0.24 parts in 109 by volume (ppbv) at 20Torr or 29 parts in 1012 by volume (pptv) at 760Torr pressure. The stability of our system is demonstrated by measuring sub-ppbv methane in N2 at 760Torr through recording the spectrum of methane lines with our setup.

© 2010 Optical Society of America

Full Article  |  PDF Article
More Like This
Periodically locked continuous-wave cavity ringdown spectroscopy

Nicola J. van Leeuwen, Jan C. Diettrich, and Andrew C. Wilson
Appl. Opt. 42(18) 3670-3677 (2003)

Doppler-free nonlinear absorption in ethylene by use of continuous-wave cavity ringdown spectroscopy

Christine R. Bucher, Kevin K. Lehmann, David F. Plusquellic, and Gerald T. Fraser
Appl. Opt. 39(18) 3154-3164 (2000)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (8)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (14)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved