Optimization of an optical system used for laser beam transformation

The principle of a specific optical device which was designed to homogenize the power density distribution of a CO2 laser beam is described in the paper. The detailed formulas to express the relation between power density distribution of converted beam and optical parameters of device are given. Based on this relation, a scheme to optimize the device is presented. The power density distributions simulated by computer before and after optimization are given. A tentative criterion to estimate the uniformity of a beam spot in which there are interference fringes, is put forward