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.
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© 1981 Springer-Verlag Berlin Heidelberg
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Freeman, R.R., Bjorkholm, J.E., Panock, R., Cooke, W.E. (1981). Optical Second Harmonic Generation by a Single Laser Beam in an Isotropic Medium. In: McKellar, A.R.W., Oka, T., Stoicheff, B.P. (eds) Laser Spectroscopy V. Springer Series in Optical Sciences, vol 30. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-38804-3_77
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DOI: https://doi.org/10.1007/978-3-540-38804-3_77
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