Laser texturing optical system based on chopping reflectors and galvanometers

Abstract

The invention discloses a laser texturing optical system based on a chopping mirror and a vibrating mirror, comprising an aberration-eliminating collimator mirror group, a chopping mirror, a first mirror, a second mirror, a third mirror, a A vibrating mirror, a second vibrating mirror, a first f-θ mirror, and a second f-θ mirror; wherein, the aberration-absorbing collimating mirror group can be replaced by an aberration-eliminating aspheric mirror. The chopper reflector and vibrating mirror laser texturing optical system provided by the present invention, through the intermittent mirror tuning function of the chopper reflector, based on the one-dimensional vibrating mirror scanning function, has the advantages of high processing efficiency and wide application range, and is suitable for pulse Laser texturing of fiber lasers is especially suitable for orderly laser texturing of high-power pulsed fiber lasers in planar translation and rotation systems.

Description

Technical field: [0001] The invention relates to the technical field of laser texturing of pulsed fiber lasers, in particular to a laser texturing optical system based on a chopping mirror and a vibrating mirror. Background technique: [0002] Laser texturing technology is a newly developed high-tech that integrates laser technology, automatic control technology, precision machinery and material science, mainly for cold-rolled steel roll texturing. [0003] Laser texturing technology uses high energy (10 4 ~10 6 W / cm 2 ), the high repetition rate pulsed laser beam irradiates the surface of the roll with negative defocus after focusing for preheating and strengthening, and the focus point after focusing is incident on the surface of the roll to form a tiny molten pool. The auxiliary gas applied to the set pressure and flow rate makes the molten material in the molten pool pile up to the edge of the molten pool as far as possible according to the specified requirements to f...

AI Technical Summary

Problems solved by technology

Among them, the single-head laser texturing, even if the high-frequency pulse is realized through the high-frequency chopper mirror, or the high-frequency pulse laser is directly used, the rotation or translation speed of the texturing material will not be very high, and the speed is large and the stability is poor. , the processing capacity is very limited; the multi-head type mainly includes beam splitter and multi-laser processing, and the common beam splitters include beam splitters, multi-faceted prisms, etc. The beam splitters are likely to cause unbalanced light splitting and energy dispersion, which is not conducive to high-efficiency laser processing. The multi-faceted prism solution is suitable for continuous lasers, and the energy utilization rate is not high. The pulsed laser has great limitations. Although the multi-laser solution helps to improve the laser texturing efficiency, the single laser texturing efficiency does not improve. , and it is difficult to maximize; the scanning type mainly includes multi-faceted prism scanning and galvanometer scanning. The limitations of multi-faceted prism scanning have been mentioned above. Under the condition that the texturized object moves, the scanning trajectory presents a zigzag shape. In the ratio of the galvanometer scanning alternately for a long period of time, overlapping or partially overlapping texturing points are prone to occur, and orderly texturing cannot be achieved, which is disordered. In the field of texturing, although two-dimensional vibrating mirror scanning can achieve disordered and ordered texturing, the first vibrating mirror is far away from the f-theta mirror. In addition to resulting in a larger size of the f-theta mirror, due to the Fused silica, the lens material usually used in class lasers, has a small refractive index, which is extremely unfavorable for f-theta mirrors, especially short-focus f-theta mirrors, to eliminate aberrations, so it is easy to cause the consistency of roughened points to deteriorate

Images