Phys. Rev. Lett. 64, 1107–1110 (1990)Nonlinear optical processes using electromagnetically induced transparencyReceived 27 December 1989; published in the issue dated 5 March 1990 We show that by applying a strong-coupling field between a metastable state and the upper state of an allowed transition to ground one may obtain a resonantly enhanced third-order susceptibility while at the same time inducing transparency of the media. An improvement in conversion efficiency and parametric gain, as compared to weak-coupling field behavior, of many orders of magnitude is predicted. © 1990 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.64.1107
DOI:
10.1103/PhysRevLett.64.1107
PACS:
42.65.Ky, 42.50.Hz, 42.50.Qg
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