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Phys. Rev. Lett. 96, 017402 (2006) [4 pages]Stimulated Terahertz Emission from Intraexcitonic Transitions in Cu2O
Received 12 June 2005; published 6 January 2006
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 ~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. ©2006 The American Physical Society
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