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) phonon in silicon (). The emission frequency covers the range of 4.6–5.8 THz. The laser process occurs due to a resonant coupling of the and donor states (separation ) via the phonon, which conserves momentum and energy within a single impurity center.
- Received 21 June 2005
DOI:https://doi.org/10.1103/PhysRevLett.96.037404
©2006 American Physical Society