A coupling device for water-guided laser processing with off-axis optical path

Abstract

The invention provides a water-jet guided laser machining and coupling device of an off-axis light path. The water-jet guided laser machining and coupling device comprises a CCD, an imaging lens, a first focusing lens, a second focusing lens, water-proof glass, a nozzle, a laser device, a first focusing lens Z-direction moving mechanism, an X-Y moving platform and a coupling water cavity. In the laser light path, the two focusing lenses are used for focusing, the first focusing lens can be adjusted in the Z direction, and the second focusing lens and the nozzle are fixedly arranged in the coupling water cavity which is fixed to the X-Y moving platform, so that the first and second focusing lenses form an off-axis light path system. By means of the water-jet guided laser machining and coupling device, the displacement of a laser spot relative to the center of the nozzle can be smaller than the actual displacement of the moving platform, so that it is achieved that the moving division and the moving increment are further subdivided, which is very beneficial to the alignment of the micro-grade laser spot and the nozzle, and coupling alignment which is higher in precision can be achieved; meanwhile, the problem that in the prior art, due to the inaccuracy in the coupling alignment, the laser transmission efficiency is reduced is solved.

Description

technical field [0001] The invention relates to the technical field of water conduction laser processing, in particular to a water conduction laser coupling device. Background technique [0002] Water guide laser technology is a laser water jet composite processing method proposed by Dr. Bernold of Switzerland in 1993. In this method, the laser is introduced into the fine water column for cutting, and the fine water column can not only conduct the laser, but also cool the workpiece and remove the molten product. On the one hand, it inherits the advantages of laser cutting, such as no mechanical pressure, no workpiece deformation, no tool wear, and narrow incision width. And remelting, greatly improve the cutting quality. [0003] The core technology of the water-guided laser is the water-guided laser coupling device, whose main function is to generate a slender and stable water beam and couple the laser into the water beam. The coupling principle is to first focus the hig...

AI Technical Summary

Problems solved by technology

However, no matter which method is used, the size of the nozzle and the diameter of the laser beam waist are very small, belonging to the micron level, which puts forward high requirements on the accuracy and resolution of the mechanical moving platform, and the inaccuracy of the coupling alignment will affect the laser transmission efficiency. It will have a serious impact, and even break the nozzle, making it impossible to perform water-guided laser processing

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