Abstract

Optical-spectra of semi-conductor lasers contain side bands symmetrically located on each side of the laser line. It corresponds to the relaxation oscillations (RO) of the carriers (1-7 GHz). We have recently shown that these RO are non degenerate and this non degeneracy results in asymmetric side bands of the laser line (fig. la). This observation of two relaxation frequencies in VCSELs is not unexpected. It is just the same observation as for ROs in Class-B multimode lasers. It is well known that these lasers (more precisely, solid-state lasers operating with a few modes) have a set of ROs frequencies.

© 2001 Optical Society of America