Finite element analysis for laser action in random porous media

This paper presents the properties of laser action in random porous media by means of a finite element method. Porous media composed of a dielectric material and randomly arranged pores are assumed as systems in which laser oscillation occurs. Population inversion density of an active medium is modeled by the negative imaginary part of relative permittivity. An amplification factor defined as the ratio between radiative power of electric field without amplification and that with amplification is computed as the function of population inversion density and frequency. A perfectly matched layer absorbing boundary condition is implemented in order to simulate the scattering of light waves in an open region.