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Doppler-Free Nonlinear Absorption in Ethylene by Use of Continuous-Wave Cavity Ringdown Spectroscopy

Published

Author(s)

C R. Bucher, K K. Lehmann, David F. Plusquellic, Gerald T. Fraser

Abstract

We report the first systematic study of Doppler-free, nonlinear absorption using cavity ring-down spectroscopy. We have developed a variant of cavity ring-down spectroscopy for the mid-infrared region between 9-11 m exploiting the intracavity power buildup that is possible using continuous wave lasers. The light source consists of a continuous wave CO2 laser with 1 mW of tunable infrared sidebands and couples into a high finesse stable resonator. The cavity is filled with a mixture of 0.5% ethylene (C2H4) in He (by volume) at a total pressure of 1.3 Pa. We tune the sideband frequencies to observe a saturated, Doppler-free Lamb dip in the υ7, 111,10 112,10 rovibrational transition of ethylene (C2H4) centered at 949.2 cm -1 . Power studies on the Lamb dip are presented to understand the effect of saturation on the Lamb dip linewidth, the peak depth and the broadband absorption.
Citation
Applied Optics
Volume
39
Issue
No. 18

Keywords

cavity ring-down spectroscopy, CW, Doppler-free, ethylene, mid-infrared, nonlinear absorption, saturation

Citation

Bucher, C. , Lehmann, K. , Plusquellic, D. and Fraser, G. (2000), Doppler-Free Nonlinear Absorption in Ethylene by Use of Continuous-Wave Cavity Ringdown Spectroscopy, Applied Optics (Accessed March 2, 2024)
Created June 1, 2000, Updated February 17, 2017