Analysis of Gain Volume in Random Laser in a Spherical Multiple Scattering Medium

摘要: We performed numerical simulation of a random laser in spherical multiple scattering medium order to examine the saturation absorption excitation process and resultant increasing gain volume under action. The size increases with 1/3 power pulse energy weak region, then approaches critical value Lth when is increased above threshold. dependence Lth, as well threshold on dye concentration, transport mean free path, stimulated emission cross section excited state lifetime were also examined. These results correspond experimental by two-beam spatial-correlation method.