Linear laser detection light source

Abstract

The utility model relates to a linear laser detection light source, including: a plurality of laser modules, a plurality of optical fibers and a linear lens, each laser module includes three kinds of lasers, the three kinds of lasers emit red, green and blue laser respectively, the laser emitted by the three kinds of lasers is mixed into white light to be emitted from the laser module, and the white light is emitted from the linear lens. The plurality of laser modules and the plurality of optical fibers are arranged in a one-to-one correspondence manner, one end of each optical fiber is connected with the corresponding laser module, the other end of each optical fiber is arranged in a line, white light emitted by the plurality of laser modules is converged into a line through the optical fibers to be emitted into the line-shaped lens, and a line-shaped light spot is formed at the output end of the line-shaped lens. According to the linear laser detection light source provided by the utility model, each laser module can work independently, and the optical fiber can be plugged, so that the failure rate of the light source can be reduced, and high-power operation and maintenance convenience is realized.

Description

Technical Field

[0001] This utility model relates to the field of semiconductor laser technology, and in particular to a linear laser detection light source. Background Technology

[0002] Semiconductors are small in size, long in life, highly integrated, and stable, and their wavelengths have covered the ultraviolet, visible, and infrared bands.

[0003] In recent years, semiconductor lasers have been shaped into various light spots, including linear, ring-shaped, and planar shapes, and are widely used in laser processing, machine vision, biomedicine, and many other fields. In machine vision, integrating lasers into lines, combined with line scanning cameras, provides advantages that LEDs and light bulbs cannot match for long-distance, high-brightness illumination. Line scanning cameras are primarily used for imaging large-format objects. When long-distance illumination requires rapid exposure and a higher-intensity light source for supplementary lighting, lasers are the preferred choice due to their small divergence angle, high brightness, high beam quality, and ease of shaping into the desired uniform light spot.

[0004] Generally, the parameter specifications for linear laser beams mainly concern requirements regarding divergence angle, optical power, and brightness uniformity. The more complex the application environment, the higher the requirements for the linear laser beam. However, conventional linear lasers often fail to meet application requirements in terms of divergence angle and beam brightness. Utility Model Content

[0005] Therefore, the technical problem to be solved by this utility model is to overcome the problem that in the prior art, when long-distance illumination is performed, if the object being measured is large, a finer line shape is required to achieve high power density per unit area. However, for lasers, the higher the power, the larger the spot size and the larger the fiber core diameter, making it difficult to achieve high-power lasers with fine line width over long distances.

[0006] To address the aforementioned technical problems, this utility model provides a linear laser detection light source, comprising: several laser modules, several optical fibers, and a line lens. Each laser module includes three types of lasers, emitting red, green, and blue laser light respectively. The laser light emitted by the three types of lasers is mixed to form white light emitted from the laser module. The several laser modules and several optical fibers are arranged in a one-to-one correspondence. One end of each optical fiber is connected to a laser module, and the other end of the optical fiber is arranged in a line. The white light emitted by the several laser modules is converged into a line through the optical fibers and strikes the line lens. The output end of the line lens forms a line light spot. This linear laser detection light source allows each laser module to operate independently, and the optical fibers are pluggable, reducing the failure rate of the light source and achieving convenient maintenance for high-power applications.

[0007] In one embodiment of this utility model, the plurality of laser modules are connected to a heat sink, which is used to dissipate heat from the laser modules.

[0008] In one embodiment of this utility model, the laser module is a semiconductor laser with three colors: RGB.

[0009] In one embodiment of this utility model, the linear lens includes a collimating lens and a microlens array group, and the light rays emitted from the plurality of optical fibers pass through the collimating lens and the microlens array group in sequence.

[0010] In one embodiment of this utility model, the microlens array group includes a plurality of cylindrical lenses, and the cross-sectional area covered by the plurality of cylindrical lenses is larger than the cross-sectional area of ​​the incident light spot of the collimating lens onto the microlens array group.

[0011] In one embodiment of this utility model, the plurality of cylindrical lenses are arranged in a rectangular array.

[0012] In one embodiment of this utility model, the core diameter of the optical fiber is 105 μm.

[0013] In one embodiment of this utility model, the power of the laser module is 5W.

[0014] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial effects:

[0015] The linear laser detection light source described in this utility model cleverly designs multiple laser modules arranged in a straight line through optical fibers to form a strip-shaped light spot. After collimation and beam expansion, it passes through a one-dimensional microlens array to achieve a uniform high-power straight line. The laser can be ultraviolet, white light, or infrared laser. This design solves the contradiction between narrow line width and high power, and can achieve a high optical power density output at a relatively low power. Attached Figure Description

[0016] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0017] Figure 1 This is a schematic diagram of the structure of the linear laser detection light source in a preferred embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the optical fibers arranged in a line in a preferred embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the line lens in a preferred embodiment of the present invention.

[0020] The diagram in the instruction manual is labeled as follows: Laser module 1, optical fiber 2, linear lens 3, collimating lens 31, microlens array group 32, heat sink 4. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments are not intended to limit the present invention.

[0022] Reference Figure 1-3 As shown, the linear laser detection light source of this utility model can be widely used in many fields such as railway inspection, coal sorting, and photovoltaic cell inspection. Specifically, it includes: several laser modules 1, several optical fibers 2, and a line lens 3. The laser module 1 is an RGB semiconductor laser. Each laser module 1 includes three types of lasers, which emit red, green, and blue lasers, respectively. The lasers emitted by the three types of lasers are mixed to form white light emitted from the laser module 1. The several laser modules 1 and several optical fibers 2 are arranged in a one-to-one correspondence. The core diameter of the optical fiber 2 is 105um. One end of the optical fiber 2 is connected to the laser module 1, and the other end of the optical fiber 2 is arranged in a line. The white light emitted by the several laser modules 1 is converged into a line through the optical fibers 2 and hits the line lens 3. The output end of the line lens 3 forms a line light spot.

[0023] Several laser modules 1 are connected to heat sinks 4, which are used to dissipate heat from the laser modules 1.

[0024] The linear lens 3 includes a collimating lens 31 and a microlens array 32. Light rays emitted from the plurality of optical fibers 2 pass sequentially through the collimating lens 31 and the microlens array 32. The microlens array 32 includes a plurality of cylindrical lenses, the cross-sectional area of ​​which is larger than the cross-sectional area of ​​the incident light spot from the collimating lens 31 to the microlens array 32. The cylindrical lenses are arranged in a rectangular array. Specifically, red (637nm), green (520nm), and blue (450nm) lasers are mixed in a certain ratio to form white light, and multiple white light modules are superimposed, such as... Figure 1 , 2 The diagram shows eight laser modules 1 focused onto a line-shaped lens 3 via eight dispersed optical fibers 2. The light exiting the fibers 2 is collimated and further expanded before passing through a one-dimensional microlens array 32, ultimately forming a line. The optical fibers are arranged in a line (i.e.,...). Figure 3 At point A in the middle, the linewidth is always maintained at 105µm. As the optical power increases, laser modules can be stacked, thus achieving power stacking while maintaining a constant linewidth.

[0025] Preferably, the above-mentioned laser modules are mixed to form 5W white light, of which 2W of red light, 2.5W of green light, and 1.5W of blue light are mixed to form white light. The white light is then transmitted through 105um, NA0.22 optical fiber 2, and the eight laser modules are superimposed to form 40W, which is then transmitted to the line lens 3, thereby forming a uniform line spot with a fan angle of 75°, a working distance of 1000mm, and a line width of 7mm.

[0026] Fiber 2 (the fiber filaments in the ferrule are multiple closely packed in a straight line to achieve...) Figure 2 The light emitted (as shown) has an NA of 0.22 and a divergence angle of 12 degrees. After being collimated into parallel light, it illuminates the microlens array and spreads out into a line. The microlens array group 32 can be designed with different cylindrical mirror sizes to control the spreading angle of the line, which can be 20 to 120 degrees by adjusting the curvature and number of cylindrical mirrors.

[0027] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A linear laser detection light source, characterized in that, include: The system comprises several laser modules, several optical fibers, and a line lens. Each laser module includes three types of lasers, emitting red, green, and blue lasers respectively. The lasers emitted by the three types of lasers are mixed to form white light emitted from the laser module. The laser modules and optical fibers are arranged in a one-to-one correspondence. One end of each optical fiber is connected to a laser module, and the other end of the optical fiber is arranged in a line. The white light emitted by the laser modules is converged into a line through the optical fibers and shines into the line lens. The output end of the line lens forms a line light spot.

2. The linear laser detection light source according to claim 1, characterized in that: The laser modules are connected to a heat sink, which is used to quickly reduce the heat dissipated by the laser modules.

3. The linear laser detection light source according to claim 1, characterized in that: The laser module is a semiconductor laser with three colors: RGB.

4. The linear laser detection light source according to claim 1, characterized in that: The linear lens includes a collimating lens and a microlens array, and the light rays emitted from the plurality of optical fibers pass through the collimating lens and the microlens array in sequence.

5. The linear laser detection light source according to claim 4, characterized in that: The microlens array group includes several cylindrical lenses, and the cross-sectional area covered by the several cylindrical lenses is larger than the cross-sectional area of ​​the incident light spot of the collimating lens onto the microlens array group.

6. The linear laser detection light source according to claim 5, characterized in that: The cylindrical lenses are arranged in a rectangular array.

7. The linear laser detection light source according to claim 1, characterized in that: The core diameter of the optical fiber is 105 μm.

8. The linear laser detection light source according to claim 4, characterized in that: The power of the laser module is 5W.

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