We develop a definition for the β factor, the fraction of spontaneous emission that seeds the laser process, for a random laser. With the wavelength-dependence of the gain (and potentially scattering) being the only possible criterion in the competition between gain and loss, our concept of β is based on the spectral properties of the spontaneous emission and laser light. We find β≈0.1. We discuss the apparent similarities and differences between the β for a cavity and a random laser.
|Number of pages||4|
|Journal||Physical review E: Statistical physics, plasmas, fluids, and related interdisciplinary topics|
|Publication status||Published - 2002|