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Digest on Nonlinear Optics: Materials, Phenomena and Devices

Nonlinear Optical Processes Using Electromagnetically Induced Transparency

Stephen E. Harris, J.E. Field, Ataç İmamoğlu

Published Jan 1, 1990• 36 citations
Publisher

Abstract

It is well known by those practicing the techniques of nonlinear optics, that the power which may be generated in a frequency summing process, or the gain which may be obtained in a parametric process are determined by the interplay of the nonlinear and linear susceptibilities. In general, as an atomic transition to the ground state is approached, the nonlinear susceptibility is resonantly enhanced, but at the same time the media exhibits a rapidly increasing refractive index and becomes opaque.

DOI
10.1109/nlo.1990.695974

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Nonlinear optical generation using electromagnetically induced transparency is demonstrated for the first time. An atomic hydrogen is used as a test atom. By applying a strong‐coupling laser field to the 3p‐2s transition, the resonant 3p‐1s transition becomes transparent with keeping the resonantly enhanced value on the nonlinear susceptibility. The generated sum‐frequency radiation at 103 nm can grow without suffering from the resonant absorption and phase‐mismatching.

AIP conference proceedings•Jan 1, 1993•0 citations
It is well known by those practicing the techniques of nonlinear optics, that the power which may be generated in a frequency summing process, or the gain which may be obtained in a parametric process are determined by the interplay of the nonlinear and linear susceptibilities. In general, as an atomic transition to the ground state is approached, the nonlinear susceptibility is resonantly enhanced, but at the same time the media exhibits a rapidly increasing refractive index and becomes opaque.
It is now well understood that the characteristics of a nonlinear optical process are the result of the interplay of the linear and nonlinear susceptibilities. In general, as an atomic transition to the ground state is approached, the nonlinear susceptibility is resonantly enhanced, but, at the same time, the media exhibits a rapidly increasing refractive index and becomes opaque. During the last several years we have shown how electromagnetically induced transparency (EIT) may be used to dramatically solve this problem.
Recently, there has been increasing interest on the idea of controlling optical responses using atomic-coherence or quantum-interferences. Typical example may be the concept of electomagnetically-induced transparency (EIT) [1]. The key idea of EIT is to apply a strong-coupling field between a metastable and upper states to dress them equivalently as two states decaying to a common level or continuum, and to induce the transparency at the split-center of Autler-Townes components. This idea of EIT may open new possibilities to various coherent processes, such as lasing without population inversion, enhanced refractive index without absorption], slow group velocity without absorption, enhanced nonlinearity without absorption, etc.