Composite light spot laser system based on optical fiber output laser modules and machining head

Abstract

The invention discloses a composite light spot laser system based on a plurality of optical fiber output laser modules and a machining head. A plurality of low-power light sources are directly used togenerate a composite light spot through an optical system, and the laser system is used for manufacturing the machining head. The composite light spot laser system based on the optical fiber output laser modules comprises the optical fiber output laser modules, a plurality of collimating lenses corresponding to the optical fiber output laser modules and a focusing lens; the output optical fiber end surfaces of the optical fiber output laser modules are located near the front foci of the collimating lens corresponding to the optical fiber output laser modules, the collimating lens at least comprises one lens; the focusing lens at least comprises one lens and is located behind the collimating lens. The use of a high-power laser beam combiner is avoided, the laser output is dispersed at a plurality of points, heat concentration is avoided, and the reliability problems caused by the beam combiner are solved; the beam quality is improved; the thermal problem in the laser optical system canbe greatly eliminated by technical means; by dispersing the thermal problem and adopting heat conduction measures, the impact of the thermal effect can be greatly reduced, and the reliability and characteristics of the system can be improved.

Description

technical field [0001] The invention relates to a laser system and a processing head, in particular to a composite spot laser system based on multiple optical fiber output laser modules and a laser processing head using the system, which belongs to the technical field of laser processing and can be widely used in the laser processing industry . Background technique [0002] In laser processing applications, laser spots with various structures are required to ensure the effect of laser processing. For example: for welding or cutting compound spot with high center power and small edge power, see Figure 1-1A ;Multi-spot spot for welding, see Figure 1-1B And Figure 1-2; for cladding, welding, quenching strip spot, rectangular spot and circular spot, etc., see Figure 1-3. [0003] currently implemented Figure 1-1A The light spot shown usually adopts a dual-wavelength light source, and the light path is as follows: diagram 2-1 As shown, the lights of different wavelengths e...

AI Technical Summary

Problems solved by technology

[0006] The first is the technical problems in the system: 1. During the laser beam combining process, the beam combiner must deal with the inevitable light leakage during the beam combining process. Thermal management is very difficult, resulting in low reliability of the device; 2. The beam combiner It is not perfect, so that the beam quality seriously deviates from its theoretically achievable level, which brings difficulties to the design of the subsequent laser optical system; 3. The laser optical system will absorb heat and cause the temperature to rise under the action of high-power laser, because glass is a bad heat conductor , the lens can only be cooled by the lens frame at the edge, which leads to a high temperature in the center of the lens, forming the so-called thermal lens effect, the greater the power, the more obvious the thermal lens effect, which will cause the drift of the light spot and affect the processing quality

[0007] The second is the cost issue: 1. High-power beam combiners are very expensive, and the unit power price of high-power lasers is usually about twice that of low-power laser modules; 2. The generation of composite spots requires lens arrays, special optical fibers, etc. Special optical components, currently only a few companies in the world can produce these components, difficult to process and expensive

[0008] Finally, the current technical solution cannot fully meet the higher characteristic requirements of laser processing for laser equipment: according to the current technical solution, once the system is designed and finalized, the spot structure is fixed in practical applications, that is, the spot distribution area is fixed and The relative energy distribution in different areas is fixed, and because different materials and applications in different scenarios have very different requirements for light spots, this makes the adaptability of traditional equipment poor, and users need to purchase a large number of equipment to meet different needs, which greatly increases the cost

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