Polarization Rotation Induced by Resonant Two-Photon Dispersion

Abstract
A polarization-rotation effect is demonstrated which utilizes the dispersion associated with 3S5S two-photon transitions in sodium vapor. A linearly polarized beam at ν1 is rotated by a circularly polarized beam at ν2 when ν1+ν2 is near the two-photon transition frequency. When combined with a polarizer a rapid optical shutter is obtained.