Condensation in disordered lasers: theory, 3D+1 simulations and   experiments
  The complex processes underlying the generation of a coherent-like emission from the multiple-scattering of photons and wave-localization in the presence of structural disorder are still mostly un-explored. Here we show that a single nonlinear Schroedinger equation, playing the role of the Schawlow-Townes law for standard lasers, quantitatively reproduces experimental results and three-dimensional time-domain parallel simulations of a colloidal laser system. 
Claudio Conti, Marco Leonetti, Andrea Fratalocchi, Luca Angelani,   Giancarlo Ruocco