Stimulated Terahertz Emission from Intra-Excitonic Transitions inCu2O
Journal Article
·
· Physical Review Letters
OSTI ID:908462
We report the first observation of stimulated emission of terahertz radiation from internal transitions of excitons. The far-infrared electromagnetic response of Cu{sub 2}O 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 {approx} 10{sup 14} cm{sup 2}. Simultaneous excitation of both exciton levels, in turn, drives quantum beats which lead to efficient terahertz emission sharply peaked at the difference frequency.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Director. Office of Science. Office of Basic EnergySciences; Alexander von Humboldt Foundation
- DOE Contract Number:
- DE-AC02-05CH11231
- OSTI ID:
- 908462
- Report Number(s):
- LBNL-58459; PRLTAO; R&D Project: 504901; BnR: KC0202020; TRN: US0703698
- Journal Information:
- Physical Review Letters, Vol. 96; Related Information: Journal Publication Date: 01/06/2006; ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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