The atmospheric oxygen band,
b1Σ
+g (υ'=0)-
X3Σ
-g (υ″=0), was detected by the resonant Voigt-effect (optical anisotropy induced in a transverse magnetic field), using a titaniumdoped sapphire laser as a light source. Elliptically polarized light was tuned to the rotational lines of this band. The polarization state of light after passing through the air was analyzed with an angle-offset birefringent prism. By adjusting the light ellipticity and the analyzer offset angle, the signal of the
pP (1, 1) line was obtained with a signalto-noise ratio of 1×10
2 for oxygen molecules in the air of 4-cm optical path at 1-atm pressure.
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