Abstract
We have observed optical second harmonic generation (SHG) in sodium vapor, in the absence of any external fields, using a single input laser beam tuned near either the allowed 3s-4d two photon transition or the dipole-forbidden 3s-5p two-photon transition. In both cases a tunable doubling of the laser was observed with surprisingly large conversion (10−5 to 10−6). When the laser was tuned to the allowed 3s-5p two-photon transition, no doubling was observed. In this paper we present the results of our experimental investigations of these phenomena, and discuss the results in the context of proposed theoretical models for the effect.KeywordsSecond Harmonic GenerationSodium VaporInput PolarizationSecond Harmonic Generation SignalSingle Laser BeamThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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