Stimulated Terahertz Emission from Intraexcitonic Transitions in Cu2O

Rupert Huber, Ben A. Schmid, Y. Ron Shen, Daniel S. Chemla, and Robert A. Kaindl
Phys. Rev. Lett. 96, 017402 – Published 6 January 2006

Abstract

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 1014cm2. Simultaneous excitation of both exciton levels, in turn, drives quantum beats, which lead to efficient terahertz emission sharply peaked at the difference frequency.

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  • Received 12 June 2005

DOI:https://doi.org/10.1103/PhysRevLett.96.017402

©2006 American Physical Society

Authors & Affiliations

Rupert Huber*, Ben A. Schmid, Y. Ron Shen, Daniel S. Chemla, and Robert A. Kaindl

  • Department of Physics, University of California at Berkeley, and Materials Sciences Division, E.O. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA

  • *Corresponding author. Electronic address: rhuber@lbl.gov

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Vol. 96, Iss. 1 — 13 January 2006

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