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Phys Rev Lett. 2006 Jan 27;96(3):037404. Epub 2006 Jan 26.

Stimulated terahertz stokes emission of silicon crystals doped with antimony donors.

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  • 1Institute of Planetary Research, German Aerospace Center (DLR), 12489 Berlin, Germany.

Abstract

Stimulated Stokes emission has been observed from silicon crystals doped by antimony donors when optically excited by radiation from a tunable infrared free electron laser. The photon energy of the emission is equal to the pump photon energy reduced by the energy of the intervalley transverse acoustic (TA) g phonon in silicon (approximately 2.92 THz). The emission frequency covers the range of 4.6-5.8 THz. The laser process occurs due to a resonant coupling of the 1s(E) and 1s(A1) donor states (separation approximately 2.97 THz) via the g-TA phonon, which conserves momentum and energy within a single impurity center.

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