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Inversionless amplification of coherent terahertz radiation

: Janke, C.; Bolivar, P.H.; Bartels, A.; Kurz, H.; Künzel, H.


Physical Review. B 67 (2003), No.15, Art. 155206, 4 pp.
ISSN: 0163-1829
ISSN: 1098-0121
ISSN: 0556-2805
Journal Article
Fraunhofer HHI ()

We experimentally demonstrate inversionless amplification of the emission from electronic transitions in a solid state system inside a cavity. A semiconductor-based terahertz (THz) emitter is exposed to a coherent, phasematched THz background field during the emission process leading to an increase in the overall emitted THz power of more than one order of magnitude. The experimental concept and results are discussed within a three-level model and an extended density matrix approach.