CN219696910U - High-power laser module - Google Patents

Abstract

The utility model belongs to the technical field of laser, and discloses a high-power laser module, which comprises: the LD array is used for generating two parallel emergent beams, and the center-to-center spacing of the emergent beams of adjacent LDs in the same row is not more than 1.5mm; the reflecting mirror is arranged on the light path of the first list of emitted light beams and is used for carrying out primary reflection on the first list of emitted light beams; a wave plate disposed on an optical path of the reflected light beam emitted from the reflecting mirror; a polarizing plate disposed on the optical path of the second incident beam and on the optical path of the transmitted beam exiting from the wave plate; the polarizing plate reflects the second incident light beam and transmits the transmitted light beam emitted from the wave plate; the transmitted light beam emitted from the polaroid sheet is overlapped with the reflected light beam emitted from the polaroid sheet to form an overlapped light beam; and a focusing mirror provided on the optical path of the superimposed light beam emitted from the polarizing plate. The laser module can obtain high-power output and has smaller volume; and the complex debugging process is canceled, and more scenes are adapted.

Description

A high-power laser module

Technical field

The utility model belongs to the field of laser technology, and particularly relates to a high-power laser module.

Background technique

Because laser has the characteristics of good directionality, high brightness, and good monochromaticity, it is widely used in welding, engraving, drilling, etching, surgery, energy and other fields.

How to lay out the optical path in a limited space to achieve high power output while further reducing the size is a problem that currently needs to be solved in laser modules.

In order to obtain high-power laser output, existing semiconductor laser modules generally use multiple TO-packaged LDs to output through multiple lenses and reflectors through a spatial array. In particular, multiple reflections from multiple mirrors are required to change the direction of the optical path to achieve high-power output. However, existing laser modules have the following shortcomings:

(1) The complex optical path design leads to space occupation and larger volume;

(2) The structure is complex, the assembly requirements such as the installation angle of components are strict, and debugging is difficult;

(3) The overall spot size is larger and the power is lower;

(4) The heat dissipation space of the LD array is cramped.

Utility model content

In order to solve the above problems, the present invention provides a high-power laser module that can obtain high-power output while being small in size. The specific technical solutions are as follows:

A high-power laser module includes:

LD array is used to generate two parallel rows of outgoing beams. The center distance between the outgoing beams of adjacent LDs in the same row is not greater than 1.5mm;

The reflector is arranged on the optical path of the first column of emitted beams to reflect the first column of emitted beams once;

The wave plate is arranged on the optical path of the reflected beam emitted from the reflector, and is used to change the polarization state of the reflected beam;

The polarizing plate is disposed on the optical path of the second column of the emitted beam, and is located on the optical path of the transmitted beam emitted from the wave plate; the polarizing plate reflects the second column of emitted beam, and transmits the transmitted beam emitted from the wave plate. The beam is transmitted; the transmitted beam emitted from the polarizer coincides with the reflected beam emitted from the polarizer to form a coincident beam;

The focusing mirror is arranged on the optical path of the coincident light beams emitted from the polarizer.

In this solution, the LD array outputs two columns of emitted beams: the second column of emitted beams is reflected by the polarizing plate; the first column of emitted beams is reflected by the mirror, and then transmitted through the wave plate, changing the polarization state, and then After being transmitted through the polarizing plate, the emitted beam in the first column finally coincides with the emitted beam in the second column, and finally converges through the focusing mirror to emit a high-power laser beam.

Further, the reflecting mirror, wave plate, polarizing plate, and focusing mirror are arranged coaxially in sequence.

Further, the wave plate is a half-wave plate.

Further, the LD array has two columns and four rows.

Further, the center distance between two columns of the LD array is no more than 15mm, and the overall size is no more than 20×30mm.

Further, the laser module also includes a relay lens group disposed between the polarizer and the focusing lens. The relay lens group includes a first lens and a second lens; the first lens is disposed between the polarizer and the focusing lens. On the optical path of the outgoing coincident beams, the coincident beams are output as a condensed beam; the second lens outputs the condensed beams emitted through the first lens into parallel beams, and then is condensed and output through the focusing lens.

Further, the focusing lens is a convex lens.

Further, the first lens, the second lens and the focusing lens are all plano-convex lenses.

Further, the focal length of the first lens is not less than the focal length of the second lens.

Compared with the existing technology, one or more of the above technical solutions can achieve at least one of the following beneficial effects:

(1) By selecting and designing the LD, ensure that the center distance between the two adjacent outgoing beams of each column of emitted beams is within the set threshold before reflection, so that each column of emitted beams only needs to be reflected once. However, it overcomes the existing technology of achieving overlapping beams through multiple mirror reflections; the first column of emitted beams that undergoes one mirror reflection, wave plate transmission, and polarizing plate transmission and the second column of emitting beams that are reflected by the polarizing plate. The overlap enables this high-power laser module to obtain high-power output while having fewer components, a simple structure, and the overall volume is greatly reduced compared with the existing technology.

(2) Through the use of relay lens groups, the lens debugging tolerance can be increased, the complex debugging process of reflectors and polarizers can be eliminated, and production efficiency can be improved; the focusing mirror can be extended outwards, allowing the laser to penetrate deep into the object, improving The flexibility of laser engraving, cutting, welding, etc. can adapt to more scenes; it can keep the overall size of the light spot smaller when it reaches the focusing mirror, thereby obtaining a smaller focused light spot; it can ensure that the LD array has enough heat dissipation space.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present utility model more clearly, the drawings needed to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. , for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without exerting creative efforts.

Figure 1 is an optical path diagram of the high-power laser module of Embodiment 1.

Figure 2 is a schematic diagram of the LD array in Embodiment 1.

Figure 3 is an optical path diagram of the high-power laser module of Embodiment 2.

In the picture: 1. LD array; 2. Reflector; 3. Wave plate; 4. Polarizer; 5. Focusing mirror; 6. First lens; 7. Second lens; L1, first outgoing beam; L2, The second beam is emitted.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all implementations. example. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present utility model.

Example 1

This embodiment provides a high-power laser module, including an LD array 1, a reflecting mirror 2, a wave plate 3, a polarizing plate 4, and a focusing mirror 5.

As shown in Figure 2, LD array 1 is a two-column multi-row LD that produces two parallel columns of outgoing beams. The center distance D1 of the outgoing beams of adjacent LDs in the same column in LD array 1 is not greater than 1.5mm. As a preferred implementation, the LD array 1 has two columns and four rows, generating a total of eight initially collimated outgoing beams. The center distance D2 between the two columns of LD array 1 is not greater than 15mm; the overall size is not greater than 20×30mm. It can be understood that those skilled in the art can select the LD array according to the technical requirements.

As shown in Figure 1, the reflector 2 is disposed on the optical path of the first column of emitted beams; the wave plate 3 is a half-wave plate, disposed on the optical path of the reflected beam emitted from the reflector 2 for converting it. The polarization state of the reflected beam; the polarizer 4 is arranged on the optical path of the second column of the emitted beam, and is located on the optical path of the transmitted beam emitted from the wave plate 3; the polarizer reflects the second column of the emitted beam (S light) , and transmits the transmitted beam (P light) with changed polarization state emitted from the wave plate; the transmitted beam emitted from the polarizing plate 4 coincides with the reflected beam emitted from the polarizing plate 4 to form a coincident beam; the focusing mirror 5 is set at The optical path of the overlapped light beams emitted from the polarizing plate 4.

As a preferred embodiment, the reflecting mirror 2, the wave plate 3, the polarizing plate 4, and the focusing mirror 5 are arranged coaxially in order to further reduce the volume.

The following takes the optical path diagram of two outgoing beams located in two columns and in the same row as an example to explain the optical path principle of this high-power laser module.

As shown in Figure 1, the second outgoing beam L2 is reflected by the polarizer 4; the first outgoing beam L1 is reflected by the mirror 2 and then transmitted through the wave plate 3. After changing the polarization state, it is transmitted through the polarizer 4. The latter transmitted beam coincides with the reflected beam of the first outgoing beam L1 after passing through the polarizer 4, and then is output through the focusing mirror 5.

It can be understood that the principles of the other six optical paths, such as the above two optical paths, are similar and will not be described again here.

The high-power laser module of this embodiment designs the LD array to ensure that the center distance between the two adjacent outgoing beams of each column of emitted beams is within the set threshold before reflection, so that the emitted beams in both columns are only Only one reflection is needed, which overcomes the existing technology's multiple reflections to achieve coincident beams. After being reflected by a mirror, transmitted through the wave plate, and transmitted through the polarizer, the first column of emitted beams coincides with the second column of emitted beams reflected by the polarizer, so that this high-power laser module can obtain high power output at the same time. , fewer components, simple structure, and the overall volume is greatly reduced compared with the existing technology.

Example 2

As shown in Figure 3, the difference between this embodiment and Embodiment 1 is that the laser module also includes a relay lens group disposed between the polarizer 4 and the focusing lens 5. The relay lens group includes a first lens 6 and the second lens 7; the first lens 6 is arranged on the optical path of the coincident beam emitted from the polarizer 4, and outputs the coincident beam as a converged beam; the second lens 7 outputs the converged beam emitted through the first lens 6 as a parallel beam. Finally, the output is concentrated through the focusing lens 5.

As a specific implementation, the focusing mirror 5, the first lens 6, and the second lens 7 are all plano-convex lenses.

As a preferred embodiment, the focal length of the first lens 6 is not less than the focal length of the second lens 7 to further reduce the volume of the lens.

The following takes the optical path diagram of two outgoing beams located in two columns and in the same row as an example to explain the optical path principle of this high-power laser module.

The second outgoing beam L2 is reflected by the polarizer 4; the first outgoing beam L1 is reflected by the mirror 2 and transmitted through the wave plate 3. After the polarization state is changed, the transmitted beam emitted from the polarizer 4 is the same as the first outgoing beam. The reflected beams of L1 reflected by the polarizer 4 overlap, and the resulting overlapped beams are converged by the first lens 6 and output as parallel beams by the second lens 7, and are finally condensed and output by the focusing mirror 5.

The high-power laser module of this embodiment can output a high-power laser beam while ensuring a small size. By using a relay lens group to lengthen the optical path, the debugging tolerance of the reflector and polarizer is increased. The structural parts alone can The output effect can be guaranteed, and the light spot can maintain a small overall size when it reaches the focusing mirror without repeated debugging, thereby obtaining a smaller focused light spot, overcoming the shortcomings of difficult debugging in the existing technology; at the same time, the focus point can be easily penetrated Inside the object, the processability of the object is improved; in addition, the relay lens group provides enough space for the LD array to dissipate heat.

Obviously, the above embodiments are only examples to clearly illustrate the technical solution of the present invention, but are not intended to limit the implementation of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model shall be included in the protection of the claims of the present utility model.

Claims (9)

1. A high-power laser module, characterized in that the laser module includes: LD array is used to generate two parallel rows of outgoing beams. The center distance between the outgoing beams of adjacent LDs in the same row is not greater than 1.5mm; The reflector is arranged on the optical path of the first column of emitted beams to reflect the first column of emitted beams once; The wave plate is arranged on the optical path of the reflected beam emitted from the reflector, and is used to change the polarization state of the reflected beam; The polarizing plate is disposed on the optical path of the second column of the emitted beam, and is located on the optical path of the transmitted beam emitted from the wave plate; the polarizing plate reflects the second column of emitted beam, and transmits the transmitted beam emitted from the wave plate. The beam is transmitted; the transmitted beam emitted from the polarizer coincides with the reflected beam emitted from the polarizer to form a coincident beam; The focusing mirror is arranged on the optical path of the coincident light beams emitted from the polarizer. 2. The high-power laser module according to claim 1, characterized in that the reflecting mirror, wave plate, polarizing plate and focusing mirror are arranged coaxially in sequence. 3. The high-power laser module according to claim 1, wherein the wave plate is a half-wave plate. 4. The high-power laser module according to claim 1, wherein the LD array has two columns and four rows. 5. The high-power laser module according to claim 4, characterized in that the center distance between two columns of the LD array is no more than 15 mm, and the overall size is no more than 20×30 mm. 6. The high-power laser module according to any one of claims 1 to 5, characterized in that the laser module further includes a relay lens group arranged between the polarizer and the focusing lens, the relay lens group The lens group includes a first lens and a second lens; the first lens is arranged on the optical path of the coincident beams emitted from the polarizer, and outputs the coincident beams as a converged beam; the second lens condenses the coincident beams emitted through the first lens. After the beam is output into a parallel beam, it is condensed and output through the focusing mirror. 7. The high-power laser module according to claim 6, wherein the focusing lens is a convex lens. 8. The high-power laser module according to claim 6, wherein the first lens, the second lens and the focusing lens are all plano-convex lenses. 9. The high-power laser module according to claim 6, wherein the focal length of the first lens is not less than the focal length of the second lens.