Aim at increasing the quality of textured roller by CO2 laser processing, a new laser beam chopping and modulating device was designed based on the beam expanding and focussing transformation characteristic. The laser radiation was transmitted and reflected to the machining surface alternately using a mechanical chopper, which resulted in efficient preheating or double points texturing effect. The selection of optical parameters for the laser beam modulating was investigated. An example application was discussed. Reasonable focal spot and energy density were gained by adjusting the position of the local beam waist and the off-focus degree. The laser textured roll had uniform roughness and high surface hardness, and the hardened bumps improved the abrasion resistant quality.