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Journal of the Physical Society of Japan

Dressed State in Solids and Optical Resonance Saturation

Eiichi Hanamura

Published Jun 1, 1983• 15 citations
Publisher

Abstract

The concept of the dressed-atom is extended to electronic system in solids under nearly resonant coherent laser field, which is in contact with phonon and photon fields. Optical resonance saturation and nonlinear optical free induction decay are discussed in terms of this dressed state. The effective temperature is defined in terms of population ratio between the doublet of the dressed states and is related to the optical phenomena from the aspect of an open system far from thermal equilibrium.

DOI
10.1143/jpsj.52.2267

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In an optical radio-frequency double-resonance experiment on NO2{\mathrm{O}}_{2}O2​ optical saturation resonances are observed. These resonances appear superimposed on the normal magnetic resonance spectrum. With increasing laser light intensity they change the resonance spectrum considerably. We present a model to describe the observed saturation phenomena: The resonances are attributed to the interaction of two optical photons and at least one radio-frequency photon with the molecule. The theory shows that saturation resonances appear in the population and in the coherence of the dressed-molecule levels in agreement with the experimental results.