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Applied Optics

Applied Optics


  • Vol. 39, Iss. 18 — Jun. 20, 2000
  • pp: 3154–3164

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  »View Author Affiliations

Applied Optics, Vol. 39, Issue 18, pp. 3154-3164 (2000)

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We report what we believe to be the first systematic study of Doppler-free, nonlinear absorption by use of cavity ringdown spectroscopy. We have developed a variant of cavity ringdown spectroscopy for the mid-infrared region between 9 and 11 µm, exploiting the intracavity power buildup that is possible with continuous-wave lasers. The infrared source consists of a continuous-wave CO2 laser with 1-mW tunable infrared sidebands that couple into a high-finesse stable resonator. We tune the sideband frequencies to observe a saturated, Doppler-free Lamb dip in the ν7, 111,10 ← 112,10 rovibrational transition of ethylene (C2H4). Power studies of the Lamb dip are presented to examine the intracavity effects of saturation on the Lamb-dip linewidth, the peak depth, and the broadband absorption.

© 2000 Optical Society of America

OCIS Codes
(230.5750) Optical devices : Resonators
(300.6190) Spectroscopy : Spectrometers
(300.6320) Spectroscopy : Spectroscopy, high-resolution
(300.6340) Spectroscopy : Spectroscopy, infrared
(300.6420) Spectroscopy : Spectroscopy, nonlinear
(300.6460) Spectroscopy : Spectroscopy, saturation

Original Manuscript: July 2, 1999
Revised Manuscript: December 22, 1999
Published: June 20, 2000

Christine R. Bucher, Kevin K. Lehmann, David F. Plusquellic, and Gerald T. Fraser, "Doppler-free nonlinear absorption in ethylene by use of continuous-wave cavity ringdown spectroscopy," Appl. Opt. 39, 3154-3164 (2000)

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