Polarization spectroscopy makes use of the polarization dependence of the nonlinear interaction between two laser beams in a gaseous medium. The laser-induced optical anisotropy is calculated using a rate equation approach, and the effect of this anisotropy on a polarized probe beam is derived. The method is useful for Doppler-free spectroscopy, for similification of molecular spectra, and for relaxation studies. A comparison with other Doppler-free saturation spectroscopy methods shows an advantage in signal-to-noise for polarization spectroscopy. Recent high resolution experiments with hydrogen, molecular sodium, and nitrogen dioxide are presented.
R. E. Teets,
F. V. Kowalski,
W. T. Hill,
T. W. Hansch,
"Laser Polarization Spectroscopy", Proc. SPIE 0113, Advances in Laser Spectroscopy I, (5 December 1977); doi: 10.1117/12.955605; https://doi.org/10.1117/12.955605