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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.


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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