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Conference on Lasers and Electro-Optics

Doppler–free CW phase–conjugate spectrum of SF6 by degenerate four-wane mixing at 10.6 μm

Jean-Luc Boulnois, Philippe Aubourg, Govind Prasad Agrawal

Published Jan 1, 1981• 0 citations
Publisher

Abstract

Recently phase conjugation at 10.6 μm has drawn considerable attention. Various nonlinear materials such as SF6, Co2, Ge, HgCdTe and doped KCI have been used to generate the conjugate wave through resonant degenerate four-wave mixing (DFWM). In most of the previous work, pulsed CO2 lasers were used.
DOI
10.1364/cleo.1981.fp5

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Degenerate-four-wave mixing (DFWM) is an important technique for the generation of phase-conjugate wave, to which much attention has been paid. In this paper. a tunalile CW CO2 1.aser is used as the pump sourse and gaseous SF6 as the nonlinear medium, the dependence of reflectivity of phase-conjugate wave generated by DFWM on the pump intensity, the pressure in SF6, the angle between the pump and probe beams as welt as the potarization of the optical fields etc, is investigated experimentatty and exptained theoretically. Peak reftectivity of 2.1x101 is abtained at P=4 Torr in the gaseous SF6. In the Doppler-free phase-conjugate spectrum of SF6 five absorption dips are observed and the spectral resolving power is measured to be about 3 MHz.
CW phase conjugation on the ν3 vibrational bands of SF6 and OsO4 is demonstrated as a means of investigation in high resolution spectroscopy through resonant degenerate four-wave mixing at 10.6 µm by using a stable low power CO2 laser operating on the P(18), P(16), P(12) lines respectively. Peak reflectivities of 3.8 10-3 are measured in SF6. They only reach 0.34 10-3 in OsO4. Phase conjugate spectra with 2 MHz, namely sub-Doppler resolutions, are compared with simultaneous recordings of the saturated-absorption spectra over a 80 MHz bandwidth. The saturation splitting encountered on a one-photon transition in SF6 is also analysed in terms of pressure broadening and pump imbalance.