ABSTRACT
A laser beam incident on a cavity wall with specular and diffuse components of reflection is partially absorbed, and the remainder diffusely and specularly reflected by the wall. A Monte Carlo method is utilized to simulate the process of propagation of a laser beam in the cavity and calculate the radiant energy absorbed by the cavity wall. In this study the intensity of a laser beam is assumed to be TEM00 mode of a Gaussian distribution and the cavity is chosen to be a paraboloid of revolution. The way dividing the cavity wall into grid is presented for the numerical calculation. The integrated energy calculated by a random generator with a cycle of 231−1 is compared with that with a cycle of 220. The convergence was tested by changing different numbers of energy bundles, ringelements, and subdivisions. The results reveal that the energy flux absorbed by the cavity abruptly rises near the critical radius for the cavity depth enough to make the incident beam intervene more than two specular reflections in the cavity.
