Numerical Analysis of Random Lasing Properties of a Waveguide Defect within a Random Structure

We numerically examined the random lasing properties of a waveguide embedded in randomly distributed dielectric cylinders by employing a two dimensional finite difference time domain method including rate equations. From the numerical results we confirmed that by optimizing the structure conditions laser oscillations can be primarily induced in the long lived model bound in the waveguide and waveguide defects play important roles in manipulating the lasing properties of internal long lived modes as well as the directional outputs via the waveguide in a random structure even when multimode lasing occurs as a result of a high pumping rate (C) 2010 The Japan Society of Applied Physics