Optical gain is the most important requirement for the realization of a semiconductor laser because it describes the optical amplification in the semiconductor material. This optical gain is due to stimulated emission associated with light emission created by recombination of electrons and holes. While in other laser materials like in gas lasers or solid state lasers, the proces. Theory for optical gain in semiconductorsSince defining semiconductor's optical gain is an ambitious undertaking, it is useful to build the understanding by steps. The basic requirements can be defined without the major complications induced by the Coulomb in. The predictive quality of microscopic modeling can be verified or disproved by optical-gain measurements. If the design is approved, one may continue to laser production. If experiments exhibit unexpecte. The figure shows sets of theoretical and experimental gain spectra for a (GaIn)(NAs)/ structure. For the experimental spectra, the injection current was varied while for the theoretical curves diffe.
