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 modes 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.