The increase in the exciton population in resonantly laser excited semiconductors was discussed. It was showed that polarization with a strict s-type radial symmetry can be efficiently converted into an incoherent p-type population for excitation around the 2s-exciton resonance. As a result, inversion between the 2p and 1s exciton states can be obtained leading to an increase in terahertz gain. The result is useful for terahertz amplification in a wide spectral range using different semiconductor materials.
ASJC Scopus subject areas
- Physics and Astronomy(all)