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Optica Publishing Group
  • Quantum Electronics and Laser Science Conference
  • OSA Technical Digest (Optica Publishing Group, 1993),
  • paper QFE1

Coherence and interference in resonantly enhanced four-wave mixing in atomic hydrogen

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Abstract

By applying an electromagnetic field to strongly couple a metastable level with the upper level of an allowed transition to ground, Harris, Field, and Imamoglu1 predicted the possibility of nonlinear generation of radiation through doubly resonant enhancement of the nonlinear susceptibility while reabsorption is suppressed by the phenomenon of induced transparency. This combination should result in vastly improved conversion efficiencies, as has been demonstrated experimentally by Hakuta, Marmet, and Stoicheff2 in the generation of second-harmonic radiation at 121.6 nm in atomic hydrogen. In this case, a dc electric field (i.e., ω = 0) was used to couple the two nearly degenerate levels, 2s and 2p. We now report on preliminary observations of a four-wave-mixing experiment in which an electromagnetic field is used to couple the 2s and 3p levels in atomic hydrogen and to generate radiation at 102.6 nm (Lyman-β).

© 1993 Optical Society of America

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