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Physical Review A

Collision-assisted second-harmonic generation from Rydberg atoms

S. S. Vianna, Cid Bartolomeu de Araujo

Published Jul 1, 1991• 8 citations
Publisher

Abstract

Second-harmonic generation in rubidium vapor has been studied in the absence of external symmetry-breaking dc fields. It is shown that binary collisions between atoms in the presence of the fundamental laser beam leads to the generation of a coherent second-harmonic beam in accordance with a recent theoretical proposal [A. El\ifmmode \mbox{\c{c}}\else \c{c}\fi{}i and D. Depatie, Phys. Rev. Lett. 60, 688 (1988)].

DOI
10.1103/physreva.44.733

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We explore the x-ray second-harmonic generation process induced by resonant two-photon absorption in systems with inversion symmetry. We show that this process becomes allowed in the x-ray region due to nondipole contributions. It is found that, although a plane-wave pump field generates only a longitudinal second-harmonic field, a Gaussian pump beam creates also a radially polarized transverse second-harmonic field which is stronger than the longitudinal one. Contrary to the longitudinal component, the transverse second-harmonic field with zero intensity on the axis of the pump beam can run in free space. Our theory is applied to Ar and Ne atomic vapors and predicts an energy conversion efficiency of x-ray second-harmonic generation of $3.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}11}$ and $1.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}12}$, respectively.

Physical Review A•Dec 2, 2019•3 citations
Second-harmonic generation in rubidium vapor has been studied in the absence of external symmetry-breaking dc fields. It is shown that binary collisions between atoms in the presence of the fundamental laser beam leads to the generation of a coherent second-harmonic beam in accordance with a recent theoretical proposal [A. El\ifmmode \mbox{\c{c}}\else \c{c}\fi{}i and D. Depatie, Phys. Rev. Lett. 60, 688 (1988)].
It is shown that optical second-harmonic generation is possible in dispersive atomic vapors since a static electric field is spontaneously created by the fundamental laser beam. When multiphoton ionization of atoms occurs simultaneously in the interaction, the spontaneous field and second-harmonic generation are significantly enhanced. Our experimental results for atomic sodium vapor irradiated by picosecond Nd-doped yttrium-aluminum-garnet laser pulses agree well with the theoretical predictions.
We explore the x-ray second-harmonic generation process induced by resonant two-photon absorption in systems with inversion symmetry. We show that this process becomes allowed in the x-ray region due to nondipole contributions. It is found that, although a plane-wave pump field generates only a longitudinal second-harmonic field, a Gaussian pump beam creates also a radially polarized transverse second-harmonic field which is stronger than the longitudinal one. Contrary to the longitudinal component, the transverse second-harmonic field with zero intensity on the axis of the pump beam can run in free space. Our theory is applied to Ar and Ne atomic vapors and predicts an energy conversion efficiency of x-ray second-harmonic generation of $3.2\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}11}$ and $1.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}12}$, respectively.