Laser cutting system

Abstract

The embodiment of the invention discloses a laser cutting system. The laser cutting system sequentially comprises a laser unit, a laser receiving unit, a beam expanding unit, a dodging unit, a shielding unit, a light beam conversion unit and a collimating and focusing assembly in the light path direction, wherein the laser unit is used for providing a laser beam; the beam expanding unit is used for expanding the laser beam into an expanded laser beam; the dodging unit is used for modulating the expanded laser beam into a uniform laser beam with uniformly distributed light intensity flat top; the shielding unit is used for shielding the edge part of the uniform laser beam and stray light outside the uniform laser beam; the light beam conversion unit is used for modulating the uniform laserbeam into a hollow annular laser beam and forming a Bessel laser beam along the optical axis direction; and the collimating and focusing assembly is used for collimating and focusing the Bessel laserbeam. According to the laser cutting system, the problems of large taper, poor section uniformity and the like of the section of the cut material caused by Gaussian distribution of light intensity distribution of the existing laser processing system are solved.

Description

technical field

[0001] The invention relates to the technical field of laser processing, in particular to a laser cutting system. Background technique

[0002] Compared with traditional mechanical cutting tools, the laser beam cuts materials in a non-contact way and uses its peak energy. This cutting method has fast processing speed and high processing efficiency, and has gradually become the mainstream processing equipment for material cutting.

[0003] At present, there are two main methods of laser cutting system, one is to change the focal plane of the laser cutting head and repeat cutting many times, and the other is to use Bessel laser beam to realize one-time cutting with long focal depth. At present, one-time cutting mainly uses the Bessel laser beam method to increase the focal depth of the cutting head, which has high processing efficiency, but there is a problem that the laser beam emitted by the laser has a Gaussian distribution of light intensity, that is, the l...

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