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Proceedings Paper

Infrared cavity ringdown and integrated cavity output spectroscopy for trace species monitoring
Author(s): Joshua B. Paul; James J. Scherer; Anthony O'Keefe; Larry Lapson; Janelle R. Anderson; Claire F. Gmachl; Federico Capasso; Alfred Y. Cho
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Paper Abstract

Although the ability of high finesse optical cavities to provide effective absorption path-lengths exceeding 10 km. has been known for quite some time, attempts to utilize this property for the purposes of high-resolution spectroscopy have often resulted in extremely complex experimental systems. Here, we demonstrate how off-axis optical paths through such cavities can be employed to produce relatively simple spectrometers capable of ultrasensitive absorption measurements. A proof-of-concept study using visible diode lasers has achieved a normalized absorption sensitivity of 1.8*10-10 cm-1Hz-1/2. Additionally, quantum cascade lasers have been employed to extend this method into the mid-infrared region, where sensitivities of 1.2*10-9 cm-1Hz-1/2 have been obtained.

Paper Details

Date Published: 22 February 2002
PDF: 11 pages
Proc. SPIE 4577, Vibrational Spectroscopy-based Sensor Systems, (22 February 2002); doi: 10.1117/12.455722
Show Author Affiliations
Joshua B. Paul, Los Gatos Research (United States)
James J. Scherer, Los Gatos Research (United States)
Anthony O'Keefe, Los Gatos Research (United States)
Larry Lapson, Harvard Univ. (United States)
Janelle R. Anderson, Harvard Univ. (United States)
Claire F. Gmachl, Lucent Technologies/Bell Labs. (United States)
Federico Capasso, Lucent Technologies/Bell Labs. (United States)
Alfred Y. Cho, Lucent Technologies/Bell Labs. (United States)

Published in SPIE Proceedings Vol. 4577:
Vibrational Spectroscopy-based Sensor Systems
Steven D. Christesen; Arthur J. Sedlacek III, Editor(s)

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