Effects of Inhomogeneity in Distribution of Scatterers on Random Laser Emission

The properties of incoherent-feedback random lasing are investigated for dye-doped polymer random media in which non-scattering regions are distributed. Experimental results show that for random media with inhomogeneous structures, the spectral peak intensity increases and the spectral width decreases compared to a homogeneous medium with the same transport mean free path.