Miniaturized high-power multi-wavelength laser beam combining device

Abstract

The invention provides a miniaturized high-power multi-wavelength laser beam combining device, which can realize high power and miniaturization and meet the requirements of high-power and high-collimation laser. Comprising N laser units, the laser units are used for outputting light beams with fixed wavelengths, the output wavelengths of the multiple laser units are different, and each laser unit comprises a laser diode and a collimating mirror; the beam splitting unit is used for receiving at least two paths of light beams and combining the light beams with different wavelengths until the light beams output by all the laser units are combined into one beam; the beam splitting unit is provided with N-1 reflecting surfaces, a light beam output by one laser unit enters from the incident end of the beam splitting unit and then is output in a horizontal transmission mode, the rest laser units are correspondingly arranged at the positions of the reflecting surfaces, and reflecting films corresponding to the wavelengths of the light beams output by the laser units are plated on the reflecting surfaces; and the coupling transmission unit is used for carrying out coupling transmission on the combined beam output by the beam splitting unit.

Description

Technical Field

[0001] The present invention relates to the field of laser technology, and in particular to a miniaturized high-power multi-wavelength laser beam combining device. Background Art

[0002] Semiconductor lasers have the advantages of small size, high efficiency, low cost, and high reliability. They are widely used in various fields of industry and life. However, semiconductor lasers are limited by the chip manufacturing process. The output power of a single laser unit is low, which will lead to a decrease in beam quality, thereby affecting the transmission and focusing effects of the beam. With the demand for high-power and high-collimation lasers, laser beam combining technology has emerged. It is a technology that combines the output beams of multiple laser sources into a single beam to achieve high-power and high-brightness output. However, the current laser beam combining device cannot achieve both high power and miniaturization. If multi-wavelength beam combining is to be met, it is generally necessary to use several dichroic mirrors and polarizers for beam combining. For example, if six wavelengths are to be combined, the number of lenses used needs to be about 10, which is relatively large in size. Therefore, it is of great significance to increase the laser power while reducing the volume. Summary of the Invention

[0003] In response to the above problems, the present invention provides a miniaturized high-power multi-wavelength laser beam combining device, which can achieve both high power and miniaturization and meet the needs of high-power and high-collimation lasers.

[0004] The present invention adopts the following technical solution, a miniaturized high-power multi-wavelength laser beam combining device, comprising:

[0005] N laser units, each configured to output a light beam of a fixed wavelength, wherein the output wavelengths of the plurality of laser units are different, each laser unit comprising a laser diode and a collimator lens, wherein the collimator lens is disposed at an output end of the laser diode; wherein N is greater than or equal to 2;

[0006] A beam splitting unit, the beam splitting unit being configured to receive at least two light beams and combine light beams of different wavelengths until the light beams output by all the laser units are combined into one beam; the beam splitting unit having N-1 reflective surfaces, wherein the light beam output by one of the laser units enters the incident end of the beam splitting unit and is output in a horizontal transmission manner, and the remaining laser units are arranged at corresponding positions of the reflective surfaces, and the reflective surfaces are all coated with a reflective film, the wavelength of the reflective film corresponding to the wavelength of the light beam output by the corresponding laser unit;

[0007] The coupling transmission unit is configured at the output end of the beam splitting unit, and is used for coupling and transmitting the combined light beam output by the beam splitting unit.

[0008] Furthermore, the beam splitting unit includes a lens group, which is composed of a plurality of coaxially arranged dichroic beam splitters, wherein the reflective surface position of each dichroic beam splitter corresponds to one of the laser units, and the dichroic beam splitter is configured to combine light beams of different wavelengths incident on the dichroic beam splitter and output the combined beam; the reflective film is configured to reflect a light beam of a fixed wavelength from the dichroic beam splitter and output the combined beam;

[0009] Furthermore, the dichroic beam splitter is placed at the output end of the collimator, and the air gap between the collimator and the reflective surface of the dichroic beam splitter is 1 mm to 2 mm; the focal length of the collimator is less than 2 mm, and the clear aperture of the collimator is less than 2.5 mm; the optical path from the laser unit to the dichroic beam splitter is equal, and the wavelength of the reflective film on the reflective surface of the dichroic beam splitter corresponds to the wavelength of the light beam output by the corresponding laser unit;

[0010] Furthermore, the coupling transmission unit includes a coupling mirror and an optical fiber, the beam splitting unit is coaxially arranged with the coupling mirror and the optical fiber in sequence, and the direction of the combined light emitted by the beam splitting unit is 0° to the normal direction of the coupling transmission unit;

[0011] Furthermore, the dichroic beam splitter is tilted so that the incident direction of the laser unit and the normal direction of the corresponding dichroic beam splitter form a 45° angle;

[0012] Furthermore, the laser units are provided at both the reflective surface and the transmissive surface of the dichroic beam splitter at the head end, and the reflective surface positions of the remaining dichroic beam splitters correspond to one laser unit;

[0013] Furthermore, a plurality of the dichroic beam splitters are arranged at intervals;

[0014] Furthermore, the beam splitting unit further comprises a reflector, the laser unit being provided at the reflective surface of the reflector; the reflector being coaxially arranged at the incident end of the lens group and tilted relative to the lens group so that the light beam emitted through the reflector is at a 45° angle to the normal direction of the light beam at the incident end of the lens group;

[0015] Furthermore, the head and tail ends of the plurality of dichroic beam splitters are glued to each other;

[0016] Furthermore, the beam splitting unit further includes a prism group, the prism group and the lens group are coaxially arranged, and the total number of reflective surfaces of the prism group and the lens group is N-1;

[0017] Furthermore, the prism group includes several spectroscopic X-prisms, each of which has an incident surface and multiple reflection surfaces. The spectroscopic X-prisms are staggered and coaxially arranged with the dichroic beam splitter, and the light beam is irradiated on the incident surface of the spectroscopic X-prism in a horizontally incident manner. The laser unit is provided at the reflection surface position of the spectroscopic X-prism, and the reflection surface of the spectroscopic X-prism is coated with the reflection film with a wavelength corresponding to the output light beam of the corresponding laser unit.

[0018] The beneficial effect of the present invention is that multiple laser units can collimate and output light beams of fixed wavelength, and light beams of different wavelengths can be combined through the beam splitting unit until the light beams output by all laser units are combined into one beam, thereby realizing multi-wavelength laser beam combining, effectively reducing the number of lenses, taking into account high power and miniaturization, meeting the needs of high-power miniaturized lasers, and having good use value. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the arrangement structure of the first embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the arrangement structure of the second embodiment of the present invention;

[0021] Figure 3 Schematic diagram of the arrangement structure of the third embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the arrangement structure of the fourth embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the arrangement structure of the fifth embodiment of the present invention;

[0024] Figure 6 Schematic diagram of the arrangement structure of the sixth embodiment of the present invention;

[0025] Figure 7 This is a schematic diagram of the simulated light path in the first embodiment of the present invention. DETAILED DESCRIPTION

[0026] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0027] The terms "first," "second," "third," and so on in the description and claims of the present invention and the accompanying drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0028] For ease of understanding, the first to sixth embodiments of the present invention are all described by taking the implementation of six-wavelength beam combining as an example, and the number of dichroic beam splitters and beam splitting X-prisms is set based on the implementation of six-wavelength beam combining:

[0029] Example 1

[0030] like Figure 1 、 Figure 2 、 Figure 3 、 Figure 7 As shown, a miniaturized high-power multi-wavelength laser beam combining device of the present invention comprises:

[0031] N laser units, each laser unit is used to output a fixed wavelength beam, and the output wavelengths of the six laser units are all different. The laser unit includes a laser diode and a collimator lens 7. The collimator lens 7 is placed at the output end of the laser diode, so that the output beam of the laser diode is collimated by the corresponding collimator lens 7 before being output; wherein N is 6;

[0032] A beam splitting unit is used to receive at least two light beams and combine light beams with different wavelengths until the light beams output by all laser units are combined into one beam; the beam splitting unit has N-1 reflecting surfaces, wherein the light beam output by one laser unit enters the incident end of the beam splitting unit and is output in a horizontal transmission manner, and the remaining laser units are arranged at the corresponding positions of the reflecting surfaces, and the reflecting surfaces are all coated with a reflective film, and the wavelength of the reflective film corresponds to the wavelength of the light beam output by the corresponding laser unit;

[0033] The coupling transmission unit is configured at the output end of the beam splitting unit and is used for coupling and transmitting the combined light beam output by the beam splitting unit.

[0034] There are six laser units, and accordingly there are six laser diodes and a collimating lens 7, which divide the six laser diodes into a first laser diode 1, a second laser diode 2, a third laser diode 3, a fourth laser diode 4, a fifth laser diode 5, and a sixth laser diode 6;

[0035] The five dichroic beam splitters are divided into a first dichroic beam splitter 8, a second dichroic beam splitter 9, a third dichroic beam splitter 10, a fourth dichroic beam splitter 11, and a fifth dichroic beam splitter 12;

[0036] The wavelength of the light beam output by the first laser diode 1 is 450 nm; the wavelength of the light beam output by the second laser diode 2 is 455 nm; the wavelength of the light beam output by the third laser diode 3 is 520 nm; the wavelength of the light beam output by the fourth laser diode 4 is 525 nm; the wavelength of the light beam output by the fifth laser diode 5 is 635 nm; and the wavelength of the light beam output by the sixth laser diode 6 is 640 nm.

[0037] The wavelengths of the reflective films on the first dichroic beam splitter 8 , the second dichroic beam splitter 9 , the third dichroic beam splitter 10 , the fourth dichroic beam splitter 11 , and the fifth dichroic beam splitter 12 are 455 nm, 520 nm, 525 nm, 635 nm, and 640 nm, respectively;

[0038] The beam splitting unit includes a lens group, which is composed of five coaxially arranged dichroic beam splitters. Each reflective surface position of the five dichroic beam splitters corresponds to a laser unit. The dichroic beam splitters are configured to combine light beams of different wavelengths incident on the dichroic beam splitters and output them. The reflective film is configured to reflect a light beam of a fixed wavelength from the dichroic beam splitters and output them.

[0039] The dichroic beam splitter is placed at the output end of the collimator 7, and the air gap between the collimator 7 and the reflective surface of the dichroic beam splitter is 1 mm to 2 mm; the focal length of the collimator 7 is less than 2 mm, and the clear aperture of the collimator 7 is less than 2.5 mm; the optical path from the laser unit to the dichroic beam splitter is equal, and the wavelength of the reflective film on the reflective surface of the dichroic beam splitter corresponds to the wavelength of the light beam output by the corresponding laser unit; the coupling transmission unit includes a coupling mirror 13 and an optical fiber 14, and the beam splitting unit is coaxially arranged with the coupling mirror 13 and the optical fiber 14 in sequence, and the output direction of the combined light of the beam splitting unit is 0° with the normal direction of the coupling transmission unit;

[0040] The dichroic beam splitter adopts a flat lens structure, and the dichroic beam splitter is tilted so that the incident direction of the laser unit and the normal direction of the corresponding dichroic beam splitter are 45 degrees.

[0041] Several dichroic beam splitters are arranged at intervals, and laser units are provided at the reflection surface and transmission surface positions of the dichroic beam splitter located at the head end, and one laser unit corresponds to the reflection surface position of the remaining dichroic beam splitters; specifically, in Example 1, Example 2, and Example 3, the first laser diode 1 and the second laser diode 2 are respectively located at the transmission surface and reflection surface positions of the first dichroic beam splitter 8, and the third laser diode 3, the fourth laser diode 4, the fifth laser diode 5, and the sixth laser diode 6 are respectively correspondingly arranged at the reflection surface positions of the second dichroic beam splitter 9, the third dichroic beam splitter 10, the fourth dichroic beam splitter 11, and the fifth dichroic beam splitter 12.

[0042] In summary, the structures of Example 1, Example 2, and Example 3 are the same. The difference is that the inclination angles between the dichroic beam splitters are different, so that the laser units are located at different sides of the dichroic beam splitters to ensure that the incident direction of the laser unit is 45° to the normal direction of the corresponding dichroic beam splitter, thereby forming different arrangements. However, the implementation principles are the same, so that different needs can be met according to different arrangements. Therefore, the arrangement structures of Example 2 and Example 3 will not be described in detail.

[0043] Example 4

[0044] like Figure 4 As shown, the difference between the fourth embodiment of the present invention and the first, second and third embodiments is that: the beam splitting unit further includes a reflector 15, and a laser unit is provided at the reflective surface of the reflector 15; the reflector 15 is coaxially arranged at the incident end of the lens group and is tilted relative to the lens group so that the light beam emitted through the reflector 15 is at a 45° angle to the normal direction of the light beam at the incident end of the lens group; the wavelength of the reflector 15 is 450 nm;

[0045] Specifically, the first laser diode 1 is located at the reflecting surface position of the reflector 15, and the second laser diode 2, the third laser diode 3, the fourth laser diode 4, the fifth laser diode 5, and the sixth laser diode 6 are respectively arranged at the reflecting surface positions of the first dichroic beam splitter 8, the second dichroic beam splitter 9, the third dichroic beam splitter 10, the fourth dichroic beam splitter 11, and the fifth dichroic beam splitter 12.

[0046] Example 5

[0047] like Figure 5 As shown, the difference between the fifth embodiment of the present invention and the first, second and third embodiments is that the head and tail ends of the plurality of dichroic beam splitters are glued together, so that the lens group forms an integral structure, which can further reduce the volume and improve the efficiency.

[0048] Specifically, the first laser diode 1 and the second laser diode 2 are respectively located at the transmission surface and reflection surface positions of the first dichroic beam splitter 8, and the third laser diode 3, the fourth laser diode 4, the fifth laser diode 5, and the sixth laser diode 6 are respectively correspondingly arranged at the reflection surface positions of the second dichroic beam splitter 9, the third dichroic beam splitter 10, the fourth dichroic beam splitter 11, and the fifth dichroic beam splitter 12.

[0049] according to Figure 1 and Figure 5 As shown, the structural arrangement of the first embodiment is the same as that of the fifth embodiment, and the light paths of the two embodiments are also the same.

[0050] The optical path combining principle of the first to fifth embodiments is:

[0051] The output beams of the first laser diode 1 and the second laser diode 2 are collimated and incident on the corresponding dichroic beam splitter or reflector 15. The output beams of the first laser diode 1 and the second laser diode 2 in Examples 1, 2, 3 and 5 are all incident on the first dichroic beam splitter 8. The output beams of the first laser diode 1 and the second laser diode 2 are all 45° to the normal direction of the first dichroic beam splitter 8. The wavelength of the reflective film on the first dichroic beam splitter 8 is 455nm, so the first dichroic beam splitter 8 only reflects the beam with a wavelength of 455nm, and the other wavelengths are transmitted. The first dichroic beam splitter 8 combines the two laser beams of 450nm and 455nm and outputs them. out and serve as the first combined light beam; similarly, in Example 4, the output light beam of the first laser diode 1 is incident at 45° to the normal direction of the reflector 15 and is reflected onto the first dichroic beam splitter 8, and the output light beam of the second laser diode 2 is incident at 45° to the normal direction of the first dichroic beam splitter 8 and is reflected. The wavelength of the reflective film on the first dichroic beam splitter 8 is 455nm, so the first dichroic beam splitter 8 only reflects the light beam with a wavelength of 455nm, and transmits the remaining wavelengths. The first dichroic beam splitter 8 combines the two laser beams of 450nm and 455nm and outputs them as the first combined light beam, that is, the first combined light beam combines the two laser beams of 450nm and 455nm;

[0052] The first combined light beam is incident at 45° to the normal direction of the second dichroic beam splitter 9, and the output light beam of the third laser diode 3 is incident at 45° to the normal direction of the second dichroic beam splitter 9 and then reflected. The wavelength of the reflective film on the second dichroic beam splitter 9 is 520nm, so the second dichroic beam splitter 9 only reflects the light beam with a wavelength of 520nm, and transmits the remaining wavelengths. The second dichroic beam splitter 9 combines the first combined light beam with the light beam with a wavelength of 520nm and outputs it as the second combined light beam, that is, the second combined light beam combines three laser beams of 450nm, 455nm, and 520nm;

[0053] The second combined light beam is incident at 45° to the normal direction of the third dichroic beam splitter 10, and the output light beam of the fourth laser diode 4 is incident at 45° to the normal direction of the third dichroic beam splitter 10 and then reflected. The wavelength of the reflective film on the third dichroic beam splitter 10 is 525nm, so the third dichroic beam splitter 10 only reflects the light beam with a wavelength of 525nm, and transmits the remaining wavelengths. The third dichroic beam splitter 10 combines the second combined light beam with the light beam with a wavelength of 525nm and outputs it as the third combined light beam, that is, the third combined light beam combines four laser beams of 450nm, 455nm, 520nm, and 525nm;

[0054] The third combined light beam is incident at 45° to the normal direction of the fourth dichroic beam splitter 11, and the output light beam of the fifth laser diode 5 is incident at 45° to the normal direction of the fourth dichroic beam splitter 11 and then reflected. The wavelength of the reflective film on the fourth dichroic beam splitter 11 is 635nm, so the fourth dichroic beam splitter 11 only reflects the light beam with a wavelength of 635nm, and transmits the remaining wavelengths. The fourth dichroic beam splitter 11 combines the third combined light beam with the light beam with a wavelength of 635nm and outputs it as the fourth combined light beam, that is, the fourth combined light beam combines five laser beams of 450nm, 455nm, 520nm, 525nm, and 635nm;

[0055] The fourth combined light beam is incident at 45° to the normal direction of the fifth dichroic beam splitter 12. The output light beam of the sixth laser diode 6 is incident at 45° to the normal direction of the fifth dichroic beam splitter 12 and is reflected. The wavelength of the reflective film on the fifth dichroic beam splitter 12 is 640 nm. The fifth dichroic beam splitter 12 only reflects the light beam with a wavelength of 640 nm, and transmits the remaining wavelengths. The fifth dichroic beam splitter 12 combines the fourth combined light beam with the light beam with a wavelength of 640 nm and outputs the combined light beam as the fifth combined light beam. That is, the fifth combined light beam combines six laser beams of 450 nm, 455 nm, 520 nm, 525 nm, 635 nm, and 640 nm.

[0056] The fifth combined light beam is incident into the coupling mirror 13 at 0° to the normal direction of the coupling mirror 13 and then coupled into the optical fiber 14, thereby taking into account both high power and miniaturization, realizing high-power six-wavelength beam combining, and only using 5 dichroic mirrors, which greatly reduces the volume.

[0057] Example 6

[0058] like Figure 6 As shown, the difference between Example 6 of the present invention and Example 1, Example 2, and Example 3 is that: the beam splitting unit further includes a prism group, the prism group and the lens group are coaxially arranged, and the total number of reflective surfaces of the prism group and the lens group is N-1; the prism group includes a plurality of beam splitting X prisms, the beam splitting X prism has one incident surface and multiple reflective surfaces, the number of reflective surfaces on the beam splitting X prism needs to be set according to the situation, the beam splitting X prism and the dichroic beam splitter are staggered and coaxially arranged, the light beam is irradiated on the incident surface of the beam splitting X prism in a horizontally incident manner, a laser unit is provided at the reflective surface position of the beam splitting X prism, and the reflective surface of the beam splitting X prism is coated with a reflective film with a wavelength corresponding to the output light beam of the corresponding laser unit.

[0059] It should be noted that the incident angles between the second laser diode 2, the third laser diode 3 and the reflecting surface of the first beam splitting X-prism 16, as well as the incident angles between the fifth laser diode 5, the sixth laser diode 6 and the reflecting surface of the second beam splitting X-prism 17 are all set accordingly according to actual conditions, so that the multiple wavelength light beams entering the first beam splitting X-prism 16 or the second beam splitting X-prism 17 can be combined and output.

[0060] Since the sixth embodiment realizes six-wavelength beam combining, two beam splitting X-prisms and one dichroic beam splitter are provided in the sixth embodiment, and the beam splitting X-prisms all have one incident surface and two reflecting surfaces. Therefore, the sixth embodiment and the previous five embodiments all have five reflecting surfaces, and a laser unit is provided at the position of each reflecting surface; and the two beam splitting X-prisms and one dichroic beam splitter can be arranged in a staggered manner front to back as needed, as long as the six-wavelength beam combining can be realized. The sixth embodiment of the present invention is a staggered arrangement of two beam splitting X-prisms and one dichroic beam splitter. The front and back placement order of the beam splitting X-prisms and the dichroic beam splitter can also be changed according to the situation, and the two beam splitting X-prisms can be distinguished. The first beam splitter X-prism 16 and the second beam splitter X-prism 17 are respectively placed at the reflection surface position of the first beam splitter X-prism 16, the fourth laser diode 4 is placed at the reflection surface position of the sixth dichroic beam splitter 18, and the fifth laser diode 5 and the sixth laser diode 6 are respectively arranged at the reflection surface position of the second beam splitter X-prism 17.

[0061] The principle of optical path combining in Example 6 is:

[0062] The first laser diode 1 emits a wavelength of 450nm, which forms collimated light after passing through the collimator 7, is horizontally incident on the first beam-splitting X-prism 16, and then is transmitted horizontally out. The second laser diode 2 and the third laser diode 3 emit wavelengths of 455nm and 520nm respectively. The first beam-splitting X-prism 16 is respectively coated with 455nm and 520nm wavelength reflective films. The output beam of the second laser diode 2 is reflected by the 455nm reflective film, and the output beam of the third laser diode 3 is reflected by the 520nm reflective film. Then, the three wavelength beams of 450nm, 455nm, and 520nm pass through the first beam-splitting X-prism 16, are combined and output as the first combined light, that is, the first combined light combines the three laser beams of 450nm, 455nm, and 520nm.

[0063] Subsequently, the first combined light beam is incident on the sixth dichroic beam splitter 18 at an angle of 45° to the normal direction of the sixth dichroic beam splitter 18 and then transmitted out. The fourth laser diode 4 emits a 525nm wavelength laser. The sixth dichroic beam splitter 18 is coated with a 525nm reflective film. The output light beam of the fourth laser diode 4 is incident on the sixth dichroic beam splitter 18 at an angle of 45° to the normal direction of the sixth dichroic beam splitter 18 and then reflected. The sixth dichroic beam splitter 18 only reflects the light beam with a wavelength of 525nm, and transmits the remaining wavelengths. The sixth dichroic beam splitter 18 combines the first combined light beam with the light beam with a wavelength of 525nm and outputs the combined light beam as the second combined light beam, that is, the second combined light beam combines the four laser beams of 450nm, 455nm, 520nm, and 525nm.

[0064] The second combined light is horizontally incident on the second beam splitting X-prism 17 and then transmitted out horizontally. The fifth laser diode 5 and the sixth laser diode 6 emit wavelengths of 635nm and 640nm respectively. The second beam splitting X-prism 17 is respectively coated with 635nm and 640nm wavelength reflective films. The output beam of the fifth laser diode 5 is reflected by the 635nm reflective film and the output beam of the sixth laser diode 6 is reflected by the 640nm reflective film. The second beam splitting X-prism 17 combines the second combined light with the 635nm and 640nm wavelength light beams and outputs them as the third combined light. That is, the third combined light combines six laser beams of 450nm, 455nm, 520nm, 525nm, 635nm and 640nm.

[0065] The third combined light beam is incident into the coupling mirror 13 at 0° to the normal direction of the coupling mirror 13 and then coupled into the optical fiber 14, thereby taking into account both high power and miniaturization, realizing high-power six-wavelength beam combining, and only using one dichroic beam splitter and two beam splitting X-prisms, which greatly reduces the volume.

[0066] The embodiment of the present invention is described based on the realization of six-wavelength beam combining. For the realization of other multi-wavelength beam combining lasers, it is only necessary to increase or decrease the number of reflective surfaces of the laser units and beam splitting units accordingly.

[0067] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0068] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A miniaturized high-power multi-wavelength laser beam combining device, characterized by: include: N laser units, each configured to output a light beam of a fixed wavelength, wherein the output wavelengths of the plurality of laser units are different, each laser unit comprising a laser diode and a collimator lens, wherein the collimator lens is disposed at an output end of the laser diode; wherein N is greater than or equal to 2; A beam splitting unit, the beam splitting unit being configured to receive at least two light beams and combine light beams of different wavelengths until the light beams output by all the laser units are combined into one beam; the beam splitting unit having N-1 reflective surfaces, wherein the light beam output by one of the laser units enters the incident end of the beam splitting unit and is output in a horizontal transmission manner, and the remaining laser units are arranged at corresponding positions of the reflective surfaces, and the reflective surfaces are all coated with a reflective film, the wavelength of the reflective film corresponding to the wavelength of the light beam output by the corresponding laser unit; The coupling transmission unit is configured at the output end of the beam splitting unit, and is used for coupling and transmitting the combined light beam output by the beam splitting unit.

2. The miniaturized high-power multi-wavelength laser beam combining device according to claim 1, characterized in that: The beam splitting unit includes a lens group, which is composed of several coaxially arranged dichroic beam splitters. The reflective surface position of each dichroic beam splitter corresponds to one of the laser units. The dichroic beam splitter is configured to combine and output light beams of different wavelengths incident on the dichroic beam splitter; the reflective film is configured to reflect and output a light beam of a fixed wavelength from the dichroic beam splitter.

3. The miniaturized high-power multi-wavelength laser beam combining device according to claim 2, characterized in that: The dichroic beam splitter is placed at the output end of the collimator, and the air gap between the collimator and the reflective surface of the dichroic beam splitter is 1mm to 2mm; the focal length of the collimator is less than 2mm, and the clear aperture of the collimator is less than 2.5mm; the optical path of the laser unit to the dichroic beam splitter is equal, and the wavelength of the reflective film on the reflective surface of the dichroic beam splitter corresponds to the wavelength of the light beam output by the corresponding laser unit.

4. The miniaturized high-power multi-wavelength laser beam combining device according to claim 2, characterized in that: The coupling transmission unit includes a coupling mirror and an optical fiber. The beam splitting unit, the coupling mirror, and the optical fiber are coaxially arranged in sequence. The emission direction of the combined light of the beam splitting unit is 0° to the normal direction of the coupling transmission unit. The dichroic beam splitter is tilted so that the incident direction of the laser unit is 45° to the normal direction of the corresponding dichroic beam splitter.

5. The miniaturized high-power multi-wavelength laser beam combining device according to claim 2, characterized in that: The laser units are arranged at the reflective surface and the transmissive surface of the dichroic beam splitter at the head end, and each of the other reflective surfaces of the dichroic beam splitter corresponds to one laser unit.

6. A miniaturized high-power multi-wavelength laser beam combining device according to claim 3, 4 or 5, characterized in that: The dichroic beam splitters are arranged at intervals.

7. A miniaturized high-power multi-wavelength laser beam combining device according to claim 3, 4 or 5, characterized in that: The beam splitting unit also includes a reflector, and the laser unit is arranged at the reflecting surface of the reflector; the reflector is coaxially arranged at the incident end of the lens group and is tilted relative to the lens group so that the light beam emitted through the reflector is at a 45° angle to the normal direction of the light beam at the incident end of the lens group.

8. A miniaturized high-power multi-wavelength laser beam combining device according to claim 3, 4 or 5, characterized in that: The head and tail ends of the plurality of dichroic beam splitters are glued and connected to each other.

9. A miniaturized high-power multi-wavelength laser beam combining device according to claim 3 or 4, characterized in that: The beam splitting unit further includes a prism group, which is coaxially arranged with the lens group. The total number of reflective surfaces of the prism group and the lens group is N-1.

10. The miniaturized high-power multi-wavelength laser beam combining device according to claim 9, characterized in that: The prism group includes several beam splitting X-prisms, each of which has an incident surface and multiple reflecting surfaces. The beam splitting X-prisms are staggered and coaxially arranged with the dichroic beam splitter, and the light beam is irradiated on the incident surface of the beam splitting X-prism in a horizontally incident manner. The laser unit is provided at the reflecting surface position of the beam splitting X-prism, and the reflecting surface of the beam splitting X-prism is coated with the reflecting film with a wavelength corresponding to the output light beam of the corresponding laser unit.

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