Stimulated THz Emission from Internal Exciton Transitions in Cu2O

DOI to cite this document:: 10.5283/epub.19125

Huber, Rupert ; Schmid, B. A. ; Shen, Y.-R. ; Chemla, D. S. ; Kaindl, R. A.

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Date of publication of this fulltext: 28 Jan 2011 07:23

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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 ...