Abstract

The resonant Voigt effect (optical anisotropy induced in a transverse magnetic field) was investigated for OH radicals in aflame, with a narrow-band dye laser as a light source. Elliptically polarized light was tuned to the Q1(1) and Q21(1) lines in the electronic transition band A2+(v′ = 1)–X2 Πi(v″ = 1). The light polarization after passing through the flame was analyzed with an angle-offset birefringent prism. The measured profiles of the Voigt-effect signal were interpreted on the basis of the molecular Zeeman effect. By adjusting the light ellipticity and the analyzer offset angle, the signal-to-noise ratio (SNR) of the Voigt effect was improved over the estimated absorption SNR by a factor of ~102 in the detection of the above lines. This technique offers an alternative method of molecular spectroscopy.

© 1987 Optical Society of America

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