A polarization-rotation effect is demonstrated which utilizes the dispersion associated with 3S-5S 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.
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Liao et al. (1976) studied this question.
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