Dynamic annular laser spot generation method and device

Abstract

The invention discloses a dynamic annular laser spot generation method and device, and belongs to the field of medium and low power laser welding. The device sequentially comprises a laser, a light beam collimation unit, an acousto-optic modulator, a light beam focusing unit and an annular optical fiber in the light path direction. The laser is used for generating an incident laser beam, and the incident laser beam is collimated by the light beam collimation unit to form a collimated laser beam; the acousto-optic modulator is used for enabling the collimated laser beam to generate Bragg diffraction to obtain 0-level diffracted light and 1-level diffracted light; the zero-level diffraction light and the first-level diffraction light are coupled into an inner fiber core and an outer fiber core of the annular optical fiber after being focused by the light beam focusing unit and are totally reflected in the inner fiber core and the outer fiber core, and then annular light spots are generated. According to the method and the device, the time splitting effect of the laser beam and the dynamic composite effect of the annular light spot energy can be achieved, the method and the device can be applied to the field of medium-low power pulse welding, and cost is low.

Description

technical field [0001] The invention belongs to the field of medium and low power laser welding, and more specifically relates to a method and device for generating a dynamic annular laser spot. Background technique [0002] With the development of the precision processing industry represented by consumer electronics, the volume of products is getting smaller and higher, and the level of precision is getting higher and higher, which brings more demands and challenges to the structural design of products, so laser welding is used in various structures It plays an increasingly important role in the connection of hardware, and its importance is also increasing. [0003] Laser pulse welding can achieve precise spot welding in tiny areas, and the size of the solder spot can reach 0.1mm, which brings a lot of convenience to product design, and the laser welding process has non-contact, good material adaptability, and precise controllable energy , Easy to automate and many other a...

AI Technical Summary

Problems solved by technology

The power of low-power pulse welding is generally low, and the average power is basically within 200W. Therefore, the high-power beam adjustable technology solution is basically not applicable in the field of low-power precision pulse welding.

Moreover, the existing technical solution uses two lasers to be coupled separately to form a ring-shaped spot, which leads to an increase in equipment cost and optical path complexity, and affects the input and output of end users, so it has not been well applied.

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