Stimulated terahertz emission from intraexcitonic transitions in Cu2O

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

Research output: Contribution to journalArticlepeer-review

58 Scopus citations

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 6.6Â meV, with a cross section of â10-14cm2. Simultaneous excitation of both exciton levels, in turn, drives quantum beats, which lead to efficient terahertz emission sharply peaked at the difference frequency.

Original languageEnglish (US)
Article number017402
JournalPhysical Review Letters
Volume96
Issue number1
DOIs
StatePublished - Jan 13 2006

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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