Stimulated terahertz emission from intraexcitonic transitions in Cu2O

We report the first observation of stimulated emission of terahertz radiation from internal transitions of excitons. The far-infrared electromagnetic response of Cu2O is monitored via broadband terahertz pulses after ultrafast resonant excitation of three-dimensional 3p excitons. Stimulated emission...

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Bibliographic Details
Published inPhysical review letters Vol. 96; no. 1; p. 017402
Main Authors Huber, Rupert, Schmid, Ben A, Shen, Y Ron, Chemla, Daniel S, Kaindl, Robert A
Format Journal Article
LanguageEnglish
Published United States 13.01.2006
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Summary:We report the first observation of stimulated emission of terahertz radiation from internal transitions of excitons. The far-infrared electromagnetic response of Cu2O is monitored via broadband terahertz pulses after ultrafast resonant excitation of three-dimensional 3p excitons. Stimulated emission from the 3p to the energetically lower 2s bound level occurs at a photon energy of 6.6 meV, with a cross section of approximately 10(-14) cm2. Simultaneous excitation of both exciton levels, in turn, drives quantum beats, which lead to efficient terahertz emission sharply peaked at the difference frequency.
ISSN:0031-9007
DOI:10.1103/PhysRevLett.96.017402