Berlin 2014 – scientific programme
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A: Fachverband Atomphysik
A 49: Precision measurements and metrology II (with Q)
A 49.5: Talk
Thursday, March 20, 2014, 18:00–18:15, DO24 1.101
Optical feedback frequency stabilized cavity ring-down spectroscopy — •Johannes Burkart and Samir Kassi — Université Joseph Fourier (Grenoble 1) / CNRS, LIPhy UMR 5588, F-38041 Grenoble, France
Metrological applications of molecular spectroscopy such as a determination of the Boltzmann constant necessitate highly linear absorption and frequency axes. These issues are addressed by our novel optical feedback frequency stabilized cavity ring-down spectrometer (OFFS-CRDS) which combines arbitrary resolution down to the kilohertz level with a shot-noise limited absorption detectivity of a few 10−13 cm−1 over one second averaging time. Its unprecedented performance is based on a single-sideband-tuned distributed-feedback diode laser that is optical-feedback locked to a highly stable V-shaped reference cavity [1]. The frequency stability of this source is transferred to a linear ring-down cavity by means of an all-fibered Pound-Drever-Hall locking scheme, which maximizes cavity transmission and yields several hundred ring-down events per second. We characterize the performance of the OFFS-CRDS spectrometer experimentally and present results from first applications to absorption line shape studies and Doppler thermometry.
[1] J. Burkart, D. Romanini, and S. Kassi, Opt. Lett. 38, 2062-2064 (2013).