An approach of the space-time empirical modes to the nonlinear phenomena in lasers with low-q cavities

Abstract

Highly nonlinear spatial-temporal patterns are inevitable features of lasing in the low-Q (bad) cavities where a photon lifetime, T E , is less than a polarization relaxation time (a lifetime of the optical dipole oscillations), T 2 , of the individual active centers excited by pumping [1]. A theoretical analysis of the spatial-temporal dynamics of the field and its spectral and correlation features in such lasers, known as the superradiant lasers, cannot be based on a standard decomposition on neither ‘cold’ no ‘hot’ modes which have fixed spatial profiles and are defined, respectively, by a cavity without or with taking into account the active medium. A progress in modern technologies, especially in the field of semiconductor heterostructures, leaves no doubts about near fabrication of these lasers and their applications in the optical information processing, the wideband dynamical spectroscopy, and diagnostics of many-particle systems in condensed active media.