CN219581927U - Optical fiber output mixed-light type laser system - Google Patents

Abstract

An optical fiber output mixed-light type laser system comprises at least one group of blue light laser module and infrared light optical fiber laser module for respectively emitting blue light laser beam and infrared light laser beam; the optical fiber beam combiner combines the two laser beams and outputs an optical component, so that the beams are collimated and two-wavelength focusing points are generated; wherein, the output blue laser beam and the infrared laser beam are coaxial and emit light in a superposition way, and the BPP is smaller than 10mm x mrad; the power of the blue light is 20-100W, the power of the infrared light is 500-5000W, the focus of the blue light is formed on the surface of the workpiece to be processed, and the focus of the infrared light is 1-3 mm away from the focus and goes deep into the workpiece to be processed, so that the optimal welding and lamination fusion effect can be obtained.

Description

Optical fiber output mixed-light type laser system

Technical Field

The present utility model relates to a laser processing, and more particularly to a fiber output mixed-light laser system which uses two wavelength laser sources, and uses optical fiber to combine the beams to make the output beams coaxial and emit light, and uses optical components to generate two wavelength focusing points to improve the stability of the laser processing process.

Background

Laser beam has excellent directivity and concentration, and laser processing has no problems of tool wear and environmental pollution, so that metal welding with laser beam is an important issue in industrial production today. However, when the absolute temperature of the high-reflection metal such as copper, gold, silver, aluminum is 295K, the high-reflection metal has different surface absorptivity for laser light with various wavelengths, and the change state is shown in figure 1; wherein the copper material (Cu) has a surface absorption of 5% for Near infrared (Near-IR) lasers having a wavelength of about 1060nm, and the copper material (Cu) has a surface absorption of 65% for Blue (Blue) lasers having a wavelength of about 450 nm. Next, fig. 2 shows bistable phenomenon of material temperature with respect to laser power by heating copper material using Infrared (IR) laser; wherein, when the copper material reaches the melting point, the melting temperature (absorptivity) will increase by 5 times, and the power of the Infrared (IR) laser must be reduced rapidly to avoid the surface temperature entering the boiling region; at this time, although the surface has a melting pool (liquid metal), the melting pool may be interrupted due to the power variation of the laser, thereby affecting the stability of the welding process. Obviously, when copper material is welded by Infrared (IR) laser, problems such as pool interruption and splashing are liable to occur.

In recent years, the trend of copper sheet welding by replacing infrared lasers with blue lasers is gradually increasing internationally; however, the blue laser is composed of a plurality of blue semiconductor lasers, the higher the power, the more the semiconductor lasers need to be combined, and the beam quality is also reduced; for example, 500W class blue lasers, which have Beam Parameter Product (BPP) as high as 40mm x mrad, cannot weld copper plates with a thickness greater than 1mm due to too small a depth of field; the quality of a typical laser beam can be measured by a Beam Parameter Product (BPP), as shown in fig. 3, wherein the value of BPP is obtained by multiplying the laser beam divergence angle α by the laser beam narrowest point radius R; therefore, the value of the BPP not only can quantify the quality of the laser beam, but also can measure the degree to which the laser beam is focused to a small point; since the BPP value of a semiconductor laser in a high power state is as high as 10 or more, the propagation characteristics and conversion characteristics of the beam are limited.

Based on the above problems, the industry also uses hundreds of watt blue lasers and kilowatt fiber lasers for spatial beam combination, but the cost is high, and the spatial beam combination needs to precisely adjust the optical lenses, so that the stability is poor, and the practicability is questioned by the industry.

Accordingly, the inventors have recognized that if two laser sources of different wavelengths, namely a blue laser and a fiber laser, can be used, the laser beam can be focused on the welding region while reducing the laser output power and the BPP value, so that the stability of the copper welding process can be further improved; however, how to achieve the benefits of this scheme is a subject to be actively considered by the inventors.

Disclosure of Invention

The main technical problem to be solved by the present utility model is to overcome the above-mentioned drawbacks of the prior art, and provide an optical fiber output mixed-light type laser system, which can mix a high-brightness blue light module with an infrared optical fiber laser and output the mixed light by one optical fiber; the output light beam can effectively improve the absorption of copper metal, and has the problems of relatively higher light beam quality, lower processing cost and improved stability of a copper welding process.

The technical scheme adopted for solving the technical problems is as follows:

a fiber optic output hybrid laser system, comprising: at least one blue laser module for emitting blue laser beam by blue optical fiber; an infrared optical fiber laser module for emitting an infrared laser beam by an infrared optical fiber; the optical fiber combiner is used for embedding the blue optical fiber and the infrared optical fiber and generating an output light beam by virtue of the output optical fiber; an output optical assembly having a collimating lens and a focusing lens arranged in a front-to-back configuration, wherein the collimating lens is configured to collimate the output light beam into a collimated parallel light beam; the focusing lens enables the parallel light beams to generate focusing points of two wavelengths, namely a first focus and a second focus; and the output light beam generated by the output optical fiber comprises the blue light laser beam and the infrared light laser beam which are coaxial and emit light in a superposition way, and the beam parameter product BPP of the blue light laser beam and the infrared light laser beam is smaller than 10mm x mrad; the first focus of the blue laser beam is formed on the surface of the material to be processed by adjusting the focusing lens, the second focus of the infrared laser beam is made to penetrate into the material to be processed, and the distance between the first focus and the second focus is 1-3 mm, so that the best welding and lamination fusion effect can be obtained.

According to the features disclosed above, the blue laser module of the present utility model has at least 7 blue laser diodes to excite at least 7 blue light beams with a wavelength of 400nm to 670nm, and the optical lens assembly includes at least 7 fast axis collimating mirrors, slow axis collimating mirrors, reflecting mirrors, and focusing mirrors, so that the respective blue light beams are collimated by the fast axis collimating mirrors and the slow axis collimating mirrors, and are spatially combined into a blue laser beam by the reflecting mirrors, and the blue laser beam is coupled into the core of the blue optical fiber by the focusing mirrors.

According to the features disclosed above, the infrared optical fiber laser module of the present utility model has a seed light source device that uses an infrared laser diode to emit a seed laser beam with a wavelength of 1064nm, an excitation light source device that uses a high-power semiconductor laser to emit an excitation laser beam with a wavelength of 800-980 nm, a beam combiner that couples the seed laser beam and the excitation laser beam into the core of the infrared optical fiber to form the infrared laser beam, and an optical fiber amplifier that amplifies the energy of the infrared laser beam.

According to a previously disclosed feature, the output fiber of the present utility model has a core with a diameter of 100 μm and a cladding with a diameter of 300. Mu.m.

According to the features disclosed above, the wavelength of the blue laser beam in the output beam is 400-480 nm, the power is 20-100W, and the wavelength of the infrared laser beam in the output beam is 900-1100 nm, the power is 500-5000W.

By means of the aforementioned features, the present utility model relates to a fiber output mixed-light type laser system, which employs at least one group of blue laser module and infrared fiber laser module to respectively emit blue laser beam with total power less than 1 hectowatt and infrared laser beam with total power reaching kilowatts; the optical fiber beam combiner combines the blue laser beam and the infrared laser beam, and outputs an optical component, so that the light beams are collimated and two-wavelength focusing points are generated; wherein, the output blue laser beam and the infrared laser beam are coaxial and emit light in a superposition way, and the BPP of the beam parameter product is smaller than 10mm < x > mrad; the power of the blue light is 20-100W, the power of the infrared light is 500-5000W, the focus of the blue light is formed on the surface of the workpiece to be processed, and the focus of the infrared light is 1-3 mm away from the focus and goes deep into the workpiece to be processed, so that the optimal welding and lamination fusion effect is obtained; compared with the traditional space beam combination, the optical fiber beam combination applied by the utility model has the benefit of lower cost; in addition, the output blue laser beam and infrared laser beam have beam parameters with the product BPP smaller than 10mm x mrad, so that the combined laser beam is focused on the welding area, the beam quality is good, and the process stability of the copper welding can be further improved.

The utility model has the beneficial effects that the high-brightness blue light module and the infrared optical fiber laser can be mixed and output by one optical fiber; the output light beam can effectively improve the absorption of copper metal, and has the problems of relatively higher light beam quality, lower processing cost and improved stability of a copper welding process.

Drawings

The utility model will be further described with reference to the drawings and examples.

FIG. 1 is a graph of the absorptivity of a conventional laser of different wavelengths at various metal surfaces.

FIG. 2 is a schematic diagram of bistable state of the art of infrared heating copper material, material temperature v.s. laser power.

FIG. 3 is a schematic diagram of the parametric product structure of a conventional laser beam.

FIG. 4 is a schematic diagram of an embodiment of a fiber output hybrid laser system according to the present utility model.

Fig. 5 is a schematic view of a section plane structure of the optical fiber combiner in the present utility model.

Fig. 6 is a schematic structural diagram of an output collimator in the present utility model.

Fig. 7 is a schematic view showing the state of the dual-wavelength focusing point in the present utility model.

FIG. 8 is a schematic diagram of a blue laser module according to the present utility model.

FIG. 9 is a schematic diagram of the structure of the infrared fiber laser module of the present utility model.

The reference numerals in the figures illustrate:

10: blue light laser module

10a: first blue-ray laser module

10b: second blue light laser module

11: blue light optical fiber

11a: first blue light optical fiber

11b: second blue light optical fiber

12: blue laser diode

13: optical lens assembly

131: quick axis collimating mirror

132: slow axis collimating lens

133: reflecting mirror

134: focusing mirror

20: infrared optical fiber laser module

21: infrared optical fiber

22: seed light source device

23: excitation light source device

24: beam combiner

25: optical fiber amplifier

30: optical fiber beam combiner

31: output optical fiber

40: output optical assembly

41: collimating lens

42: focusing lens

90: material to be processed

100: optical fiber output hybrid laser system embodiments

F: focusing point

F1: first focal point

F2: second focus

L1: blue laser beam

L11: blue light beam

L1a: first blue laser beam

L1b: a second blue laser beam

L2: infrared laser beam

L21: seed laser beam

L22: exciting a laser beam

L3: output light beam

L31: parallel light beam

Δz: distance position

Detailed Description

The following embodiments of the present utility model are described in terms of specific examples, and other advantages and effects of the present utility model will be readily apparent to those skilled in the art from the disclosure herein. The utility model may be practiced or carried out in other embodiments and details that depart from the spirit and scope of the present utility model.

First, the structure of the embodiment 100 of the present utility model, which is shown in FIG. 4, comprises: at least one blue laser module 10 for emitting a blue laser beam L1 through a blue optical fiber 11; in this embodiment, the blue laser modules 10 have two groups, so the present embodiment includes a first blue laser module 10a connected to the first blue optical fiber 11a to emit a first blue laser beam L1a, and a second blue laser module 10b connected to the second blue optical fiber 11b to emit a second blue laser beam L1b; an infrared optical fiber laser module 20 for emitting an infrared laser beam L2 through an infrared optical fiber 21; the optical fiber combiner 30 is used for embedding the blue optical fiber 11 and the infrared optical fiber 21, and generating an output light beam L3 by an output optical fiber 31, which has a fiber core with a diameter of 100 μm and a cladding with a diameter of 300 μm; in this embodiment, the first blue optical fiber 11a, the second blue optical fiber 11b and the infrared optical fiber 21 are embedded in the optical fiber combiner 30, as shown in fig. 5; an output optical assembly 40, as shown in fig. 6, has a collimating lens 41 and a focusing lens 42 disposed in front-back, wherein the collimating lens 41 is used for forming the output light beam L3 into a collimated parallel light beam L31; the focusing lens 42 makes the parallel light beam L31 passing through generate a focusing point F with two wavelengths, namely a first focus F1 and a second focus F2; and the output beam L3 generated by the output optical fiber 31 comprises the blue laser beam L1, the wavelength of which is 400 nm-480 nm, and the power of which is 20-100W; the wavelength of the infrared laser beam L2 is 900 nm-1100 nm, and the power is 500-5000W; the two beams are coaxial and emit light in a superposition way, and the beam parameter product BPP of the blue laser beam L1 and the infrared laser beam L2 is smaller than 10mm x mrad; the first focal point F1 of the blue laser beam L1 is formed on the surface of the material to be processed 90 by adjusting the focusing lens 42, the second focal point F2 of the infrared laser beam L2 is made to penetrate into the material to be processed 90, and the distance Δz between the first focal point F1 and the second focal point F2 is 1-3 mm, as shown in fig. 7, so as to obtain the best welding and lamination effect.

In the present utility model, as shown in fig. 8, the blue laser module 10 has at least more than 7 blue laser diodes, in this application 9 blue laser diodes 12, and the exciting 9 blue laser beams L11 with wavelengths of 400 nm-670 nm, the optical lens assembly 13 includes at least 7 fast axis collimating mirrors 131, slow axis collimating mirrors 132, and reflecting mirrors 133, in this application 9 blue laser beams L11 are respectively collimated by the fast axis collimating mirrors 131 and the slow axis collimating mirrors 132, and are spatially combined into a blue laser beam L1 after being reflected by the reflecting mirrors 133, and the blue laser beam L1 is coupled into the core of the blue optical fiber 11 after being focused by the focusing mirrors 134.

In the present utility model, as shown in fig. 9, the infrared fiber laser module 20 has a seed light source device 22 using an infrared laser diode to emit a seed laser beam L21 having a wavelength of 1064nm, an excitation light source device 23 using a high-power semiconductor laser to emit an excitation laser beam L22 having a wavelength of 800-980 nm, and a beam combiner 24 to couple the seed laser beam L21 and the excitation laser beam L22 into the core of the infrared fiber 21 to form the infrared laser beam L2, and a fiber amplifier 25 to amplify the energy of the infrared laser beam L2.

The present utility model relates to a fiber output mixed-light type laser system, which employs at least one group of blue laser module 10 and fiber laser module 20 to respectively emit blue laser beam L1 with total power less than 1 hundred watts and infrared laser beam L2 with total power up to kilowatts; the optical fiber combiner 30 combines the blue laser beam L1 and the infrared laser beam L2, and outputs an optical component 40, which collimates the beams and generates a focusing point F of two wavelengths; wherein, the output blue laser beam L1 and the infrared laser beam L2 are coaxial and overlap to emit light, and the beam parameter product BPP is smaller than 10mm x mrad; the power of the blue light is 20-100W, the power of the infrared light is 500-5000W, the first focus F1 of the blue light is formed on the surface of the workpiece 90, and the second focus F2 of the infrared light is 1-3 mm away from the first focus F2 and extends into the workpiece 90, so that the best welding and lamination fusion effect is obtained; compared with the traditional space beam combination, the optical fiber beam combination applied by the utility model has the benefit of lower cost; furthermore, the output blue laser beam L1 and the infrared laser beam L2 have the beam parameter product BPP smaller than 10mm x mrad, so that the combined laser beams are focused on the welding area, the beam quality is good, and the process stability of the copper welding can be further improved.

The above description is only of the preferred embodiments of the present utility model, and is not intended to limit the present utility model in any way, and any simple modification, equivalent variation and modification made to the above embodiments according to the technical principles of the present utility model still fall within the scope of the technical solutions of the present utility model.

Claims (5)

1. A fiber optic output hybrid laser system, comprising:

at least one blue laser module for emitting blue laser beam by blue optical fiber;

an infrared optical fiber laser module for emitting an infrared laser beam by an infrared optical fiber;

the optical fiber combiner is used for embedding the blue optical fiber and the infrared optical fiber and generating an output light beam by virtue of the output optical fiber;

an output optical assembly having a collimating lens and a focusing lens arranged in a front-to-back configuration, wherein the collimating lens is configured to collimate the output light beam into a collimated parallel light beam; the focusing lens enables the parallel light beams to generate focusing points of two wavelengths, namely a first focus and a second focus; and

the output light beam generated by the output optical fiber comprises the blue light laser beam and the infrared light laser beam which are coaxial and emit light in a superposition way, and the BPP of the blue light laser beam and the infrared light laser beam is less than 10mm x mrad; the first focus of the blue laser beam is formed on the surface of the material to be processed through the adjustment of the focusing lens, the second focus of the infrared laser beam is made to penetrate into the material to be processed, and the positions of the first focus and the second focus are separated by 1-3 mm, so that the best welding and lamination fusion effect can be obtained.

2. The system of claim 1, wherein the blue laser module has at least 7 blue laser diodes to excite at least 7 blue light beams with wavelengths of 400 nm-670 nm, the optical lens assembly includes at least 7 fast axis collimating mirrors, slow axis collimating mirrors, reflecting mirrors, and focusing mirrors, so that the individual blue light beams are collimated by the fast axis collimating mirrors and the slow axis collimating mirrors, respectively, and are spatially combined into blue laser beams by the reflecting mirrors, and the blue laser beams are coupled into the cores of the blue optical fibers by the focusing mirrors.

3. The optical fiber output hybrid laser system according to claim 1, wherein the infrared optical fiber laser module has a seed light source device which uses an infrared light laser diode to emit a seed laser beam having a wavelength of 1064nm, an excitation light source device which uses a high power semiconductor laser to emit an excitation laser beam having a wavelength of 800 to 980nm, a beam combiner to couple the seed laser beam and the excitation laser beam into a core of the infrared light optical fiber to form the infrared light laser beam, and an optical fiber amplifier to amplify energy of the infrared light laser beam.

4. The fiber output hybrid laser system of claim 1, wherein the output fiber has a core with a diameter of 100 μm and a cladding with a diameter of 300 μm.

5. The optical fiber output hybrid laser system of claim 1, wherein the blue laser beam in the output beam has a wavelength of 400nm to 480nm, a power of 20 to 100W, and the infrared laser beam in the output beam has a wavelength of 900nm to 1100nm, and a power of 500 to 5000W.