Frequency-locking monopulse ultraviolet ultrafast laser precise marking method and system for high-reflection metal

Abstract

The invention provides a frequency-locking monopulse ultraviolet ultrafast laser precise marking method for high-reflection metal. The method comprises the following steps: 1) placing the high-reflection metal on an operation table; (2) a laser is arranged on one side of the operation table; (3) locking the transmitting frequency to be a certain value between 1K and 500K; (4) ultrafast laser emitted by the laser device is subjected to beam size amplification through a shaping light path, then is input into a galvanometer through a beam transmission light path, and is focused on the surface of the high-reflection metal workpiece on the operation table after passing through a field lens; and (5) setting laser parameters and machining parameters under the control of a software and hardware controller, and controlling the movement of the laser beam in the X axis, the Y axis and the Z axis to finish the laser marking of the patterns on the high-reflection metal surface. According to the method, based on the locked ultrafast laser with high repetition frequency, high-energy monopulse work, high monopulse photon peak power and high monopulse energy consistency, deep black stable precision marking can be achieved without oxidation treatment on the high-reflection metal surface.

Description

technical field [0001] The invention relates to the technical field of laser marking, in particular to a frequency-locked single-pulse ultraviolet ultrafast laser precision marking method and system for highly reflective metals. Background technique [0002] Metal aluminum, copper, gold, silver and their alloy materials are widely used in consumer electronics, automobiles, aerospace, construction and home life. In the application of marking, traceability, anti-counterfeiting, big data, etc. based on such materials, marking technology, especially laser marking technology, is a very important method of retaining information. [0003] Ordinary marking techniques are mostly spray paint or mechanical engraving, the effect is relatively rough, and it is not easy to retain information for a long time. Therefore, laser marking is expected to be high. However, this type of material has a high rate of laser emission, and it is difficult for ordinary laser marking machines to print c...

AI Technical Summary

Problems solved by technology

However, the laser in the ordinary continuous operation mode can only be realized by accumulating higher heat over time, while the peak power of laser photons in long-pulse operation is not enough, and the operating frequency of other fiber ultrafast lasers is too high, and the energy of photons in the pulse train is uneven, while The heat-affected zone with different effects on the surface of the material will cause bubble effects, slag hanging on the processing surface, cracks and chipping, resulting in unclear marking content, weak consistency, and even degradation of material strength, changing the characteristic parameters of the material

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