Recent developments in the theory of multimode random lasers

Abstract

We review recent extensions of semiclassical multimode laser theory to open systems with overlapping resonances and inhomogeneous refractive index. An essential ingredient of the theory are biorthogonal quasimodes that describe field decay in an open passive system and are used as a basis for lasing modes. We discuss applications of the semiclassical theory, as well as other experimental and numerical results related to random lasing with mode competition.

Optically pumped mirrorless lasing. A review. Part I. Random lasing

“…The gain (loss) length is the length for which the intensity of light waves travelling inside the gain medium increases (decreases) e times. The lasing threshold is defined by the condition g l    [28].…”

Lasing threshold of one- and two-photon-pumped dye-doped silica powder

“…A detailed discussion of the latest results and theories concerning this phenomenon can be found in Refs. [5,[11][12][13][14].…”

Nonlinearσmodel for optical media with linear absorption or gain

“…One of these aspects concerns the propagation of light in nonconservative disordered media. Such systems can be physically realized, for example, as random lasers [11][12][13], which have received much attention recently. A promising research direction in this context are theories that combine description of wave propagation through disordered medium with the nonlinear laser equations [14][15][16].…”