A THEORETICAL CALCULATION OF METAL DRILLING BY LASERS
激光对金属打孔的理论计算

A "rectangular" phenomenological model of interaction between ms pulses of laser beam and metals has been set up. When power density is greater than the damage threshold, the metal possesses a constant ablation rate. A differential equation has been obtained by combining propagation of a Gaussian beam. Through numerical calculation, relations of the dependence of depth and shape of hole on the target position, lens focal length, directionality and energy of laser beam have been discussed.