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Superradiant Terahertz Emission from Bloch Oscillations

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Abstract

Impulsively excited Bloch oscillations in semiconductor superlattices are attractive for the generation of coherent terahertz (THz) electromagnetic radiation tunable with a dc bias field over the wide frequency range from 0.2 to 10 THz. So far, only the emission characteristics at low density of the photo-excited charge carriers (1-3×109 cm-2 per well) have been investigated.1 For technical acceptable emission, the carrier density must be increased. According to the standard theory of emission from coherent ensembles (superradiant emission)2, the radiation power should scale quadratically with excitation density. For the signal decay rate, however a linear density dependence is expected.

© 1996 Optical Society of America

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