Three-dimensional rendering of the electric field from numerical calculations in a random laser in which the yellow spheres represent the nanoparticles in a cylindrically symmetric gain medium. The electric field, where color and height indicate intensity, represents the steady-state solution of the Maxwell-Bloch system of equations.

Hakan E. Türeci, A. Douglas Stone, Li Ge, Stefan Rotter, and Robert J. Tandy. "Ab initio self-consistent laser theory and random lasers," Nonlinearity 22, C1-C18 (2009).

Image courtesy: Dr. Robert Tandy, Yale University.