Abstract: The present invention discloses a varifocal laser processing system and method based on a variable light spot diffractive element. The system includes a laser device for generating a laser, a collimating lens for changing a light path and a diffractive optical element module for controlling light spot focal point distribution. The laser emitted by the laser device passes through the collimating lens to irradiate the diffractive optical element module, and the laser focused by the diffractive optical element module irradiates a to-be-processed workpiece; and the diffractive optical element module includes at least two DOE lenses oppositely distributed in an axial direction and a rotary actuator driving the DOE lenses to rotate. The rotary actuator drives at least one DOE lens to rotate with a central axis as a rotating center, thereby changing a position of a focal point generated after the laser is focused by the diffractive optical element module.

Abstract: The present invention discloses a varifocal laser processing system and method based on a variable light spot diffractive element. The system includes a laser device for generating a laser, a collimating lens for changing a light path and a diffractive optical element module for controlling light spot focal point distribution. The laser emitted by the laser device passes through the collimating lens to irradiate the diffractive optical element module, and the laser focused by the diffractive optical element module irradiates a to-be-processed workpiece; and the diffractive optical element module includes at least two DOE lenses oppositely distributed in an axial direction and a rotary actuator driving the DOE lenses to rotate. The rotary actuator drives at least one DOE lens to rotate with a central axis as a rotating center, thereby changing a position of a focal point generated after the laser is focused by the diffractive optical element module.

Abstract: A laser pipe cutting device is provided. It includes a cutting head, a lathe bed, a first chuck, a second chuck and a third chuck; the first chuck is a fixed chuck for positioning axially and radially a pipe fitting; the second chuck is a rolling chuck for positioning radially the pipe fitting; and a fixed clamping disc and a rolling clamping disc are arranged on the third chuck at both ends. In the scheme, the third chuck integrates both the rolling clamping function and the fixed clamping function to achieve larger supporting weight and more accurate clamping precision, so that the chucks can drive a thin pipe fitting to rotate at a higher speed, the cutting efficiency is improved, and no-dead-angle and zero-tailing cutting is achieved.