TWM618161U - Low numerical aperture fiber output diode laser module - Google Patents

Abstract

This creation develops a new type of fiber output diode laser module, which combines several independent diode lasers through the newly designed beam collimation and spatial integration, and the coupling light enters the fiber core with a diameter of 105um and a numerical aperture of 0.12. Compared with the 0.22 NA optical fiber, the optical fiber has a light output angle of 55%. It is verified with a general blue laser diode. The optical software is first used to assist in the design and optimization of the optical lens parameters. In the experiment, 8 A blue diode laser is precisely assembled through a theoretically designed optical lens assembly. The light is coupled into a fiber with a core diameter of 105um and a numerical aperture of 0.12 to achieve a blue laser output with a power of 30W, which becomes the smallest numerical aperture blue laser. .

Description

Low numerical aperture fiber output diode laser module

This creation is related to a low numerical aperture fiber output diode laser module. The collimation of the optical lens components and spatial beam combination, couple the light into the fiber core to a low numerical aperture.

High-brightness lasers are important components for today's material processing, medical, military, and 3D film and television applications. Semiconductor lasers have become the first choice for manufacturing high-brightness lasers today and in the future because of their mass production, low cost, small size, and high electro-optical conversion efficiency. Therefore, semiconductor lasers use optical fibers to output light beams to obtain higher brightness, which has been used for a long time. However, the higher the output power of the semiconductor laser, the lower the quality of the output beam. If it is used as the output end with the existing general fiber core diameter of 105um, the beam parameter product (BPP) will be greater than 10mm*mrad, which makes it difficult to present high brightness. Therefore, the application of semiconductor lasers cannot be extended to larger uses. Therefore, in view of the above-mentioned problems, the creator conceived a high-brightness diode laser module with a low numerical aperture fiber output, which is the subject of this creation.

The reason is that the main purpose of this creation is to provide a low numerical aperture fiber output diode laser module, which uses a low numerical aperture output fiber to improve the efficiency of the beam divergence angle.

Another purpose of this creation is to provide a low numerical aperture fiber output diode laser module, which uses a high hydroxyl value, so that the fiber has a better penetration rate for lasers with a wavelength of less than 460nm.

Another purpose of this creation is to provide a low numerical aperture fiber output diode laser module. The fiber end face adopts a beam cutting method, which is different from general grinding and polishing. This method has fast cutting and is suitable for mass production. Increased efficacy.

Another purpose of this creation is to provide a low numerical aperture fiber output diode laser module whose laser chip is packaged in an airtight environment to enhance the efficiency of the long-term durability of the laser.

Another purpose of this creation is to provide a low numerical aperture fiber output diode laser module, the resonant cavity of the laser chip is coated with a reflective film, and a coating with a reflectivity of ≧20% is used to withstand higher The effect of external reflected light is improved.

To achieve the above purpose, the technical means used in this creation include: a housing; a plurality of laser diodes, which are located in the housing, and excite multiple light beams; an optical lens assembly, which is located in the housing, and After each of the beams are collimated, they are combined into a combined beam in space; and an optical fiber having a core, and the output of the optical fiber is set to a low numerical aperture, and the optical fiber is combined on the side of the housing, so that the combined beam can be Coupled to the core to the low numerical aperture.

According to the aforementioned features, the diameter of the core is 105um; the low numerical aperture is 0.12.

According to the features disclosed above, the optical fiber adopts a high hydroxyl value.

According to the features disclosed above, the optical fiber end face adopts a beam cutting method.

According to the features disclosed above, the optical fiber output end adopts a transparent window mirror, and the transparent window mirror is matched with an air-tight solder.

According to the features disclosed above, the laser diode includes a laser chip having a resonant cavity. The end surface of the resonant cavity forms a mirror surface and can be coated with a reflective film. The reflectivity of the reflective film is ≧20% .

According to the aforementioned features, there are at least 8 laser diodes.

According to the aforementioned features, the wavelength of the laser diode is 450 nm.

According to the aforementioned features, the optical lens assembly includes a plurality of fast-axis collimators, a plurality of slow-axis collimators, and a complex mirror, and each of the light beams passes through each of the fast-axis collimators and each of the slow-axis collimators. Straight back and after passing through each of the reflecting mirrors, they are spatially combined into a combined light beam, and the combined light beam can be coupled to the core through the focusing mirror.

According to the features of the foregoing disclosure, the housing includes a base and a cover, the base is provided with a groove, the groove has a step, and the step can hold each of the laser diodes so that each of the laser diodes The bodies can be arranged in parallel, and each of the fast-axis collimating mirrors is arranged on the step, and is close to the front of each of the laser diodes, and each of the slow-axis collimating mirrors and each of the reflecting mirrors are arranged on the concave On the groove, and each of the slow axis collimating mirrors is arranged in front of each of the fast axis collimating mirrors, each of the reflecting mirrors is arranged in front of each of the slow axis collimating mirrors, and then the focusing mirror is arranged on each of the reflecting mirrors The side edge and the focusing lens are combined on the side surface of the groove, and the position of the focusing lens is matched with the position of the fiber core.

With the help of revealing technical means, this creation has the following effects to enhance those who need to be further clarified: 1. Laser products with smaller angles and better durability can expand the application of semiconductor lasers to larger applications, such as laser welding and metal 3D printing. 2. In terms of brightness, the output fiber with high hydroxyl value and NA0.12 numerical aperture is used. Under the condition of the same core diameter of 105um, the beam parameter product (BPP) of its beam quality is only general NA0.22 55% of the optical fiber, and the optical fiber has a better penetration rate for lasers with a wavelength of <460nm. 3. The optical fiber end face adopts the beam cutting method, which is different from general grinding and polishing. This method has fast cutting and is suitable for mass production. 4. The laser chip is packaged in an airtight environment to enhance the long-term durability of the laser. In practice, in addition to sealing the upper cover by welding, the optical fiber output end adopts a transparent window mirror with air-tight solder, so that the laser can be operated in an air-tight environment and avoid environmental air pollution to the mirror surface of the resonant cavity. 5. The resonant cavity of the laser chip is coated with a reflective film, and a coating with a higher reflectivity is used to withstand higher reflected power. Generally, high-power laser diodes take into account the light output efficiency, and the coating reflectivity is mostly set below 10%. The light output efficiency of the electro-optical conversion efficiency is greater than 50%, but the disadvantage is that it is more sensitive to reflected light, especially for direct semiconductor lasers. Processing purpose. In practice, the reflectivity of the coating is increased to more than 20%, which can withstand higher reflected light, especially for laser processing purposes.

First of all, please refer to Figures 1 to 5B. This creation of a low numerical aperture fiber output diode laser module includes: a housing 10, in this embodiment, the housing 10 includes a base 11 and a package Cover 12, the seat body 11 is provided with a groove 111, the groove 111 has a step 112, the step 112 can hold each of the laser diodes 20, so that the laser diodes 20 can be parallel Arrangement, but not limited to this. In addition, the shape and size of the housing 10 are not limited to the drawings.

A complex laser diode 20 is located in the housing 10 and excites a complex light beam 21. In this embodiment, the laser diode 20 is a blue laser diode and a red laser diode , Green laser diode or UV laser diode, can also achieve high brightness requirements through this method; the laser diode 20 at least 8; the laser diode 20 The wavelength is 400nm~670nm, also from UV to red light, but not limited to this.

An optical lens assembly 30, which is located in the housing 10, and after collimating each of the light beams 21 respectively, and then merged into a combined light beam (L) in the space (S), in this embodiment, the optical lens assembly 30 includes A complex fast-axis collimator lens 31, a complex slow-axis collimator lens 32, a complex mirror 33 and a focusing mirror 34, each of the fast-axis collimator lens 31 is arranged on the step 112, and is close to each of the laser diodes 20, each of the slow-axis collimating mirrors 32 and each of the reflecting mirrors 33 are arranged on the groove 111, and each of the slow-axis collimating mirrors 32 is arranged in front of each of the fast-axis collimating mirrors 31, each The reflecting mirror 33 is arranged in front of the slow-axis collimating mirrors 32, so that the light beams 21 are collimated by the fast-axis collimating mirrors 31 and the slow-axis collimating mirrors 32 respectively, and then pass through the reflecting mirrors. After 33, it merges into a combined beam (L) in space (S), but it is not limited to this.

In addition, in this embodiment, as shown in FIG. 2C, the laser diode 20 includes a laser chip 22. The laser chip 22 has a resonant cavity 221. The end surface of the resonant cavity 221 forms a mirror surface 222. A reflective film 223 can be coated, and the reflectivity of the reflective film 223 is ≧20%, but it is not limited to this.

An optical fiber 40 has a core (Core Optical Fiber) 41, and the output of the optical fiber 40 is set to a low numerical aperture 42, and is coupled to the side 101 of the housing 10, so that the combined light beam (L) can be coupled to the core 41 to the low numerical aperture (Numerical Aperture, NA) 42, in this embodiment, the focusing lens 34 is arranged on the side of each of the reflecting mirrors 33 and the focusing lens 34 is combined with the side surface 1111 of the groove 111, and Cooperating with the position of the focusing lens 34 corresponding to the position of the core 41, the combined light beam (L) can be coupled to the core 41 via the focusing lens 34, but it is not limited thereto.

On the other hand, in this embodiment, as shown in Figure 3C, the diameter (d) of the core 41 is 105um, and the low numerical aperture 42 is 0.12, and the numerical aperture is defined as NA=sinα, where α is the output light The taper angle, the optical fiber 40 adopts a high hydroxyl (OH) value and the end face 43 of the optical fiber 40 adopts beam cutting, but it is not limited to this. In addition, in another embodiment, as shown in FIG. 3D, the output end 44 of the optical fiber 40 adopts a transparent window lens 45, and the transparent window lens 45 is matched with an airtight solder 46, but it is not limited thereto.

An optical software 50, which verifies the laser diode 20, facilitates the design and optimization of the parameters of the optical lens assembly 30, and achieves a theoretical coupling efficiency of more than 90%, but it is not limited to this.

Based on such a configuration, the output fiber with a numerical aperture≦NA0.12 is used, the beam divergence angle is small, and the high hydroxyl value is used, so that the fiber 40 has a better transmittance for lasers with a wavelength of <460nm, and the fiber The end face 43 of 40 adopts the beam cutting method, which is different from general grinding and polishing. This method has fast cutting, is suitable for mass production and reduces the mirror damage caused by grinding. In addition, the laser chip 22 is packaged in an airtight environment to improve the mine Long-term durability of the laser, and the resonant cavity 221 of the laser chip 22 is coated with the reflective film 223, which adopts a coating with a reflectivity of ≧20% to withstand higher external reflected light, especially for laser processing purposes, And in conjunction with Figure 4, the schematic diagram of the spatial beam merging of the 8 blue lasers; Figure 5A shows the output optical power versus current of the optical fiber output blue laser, and the wavelength is 450nm, the diameter of the core 41 ( d) is 105um and numerical aperture≦NA0.12 as conditions to form a Fibre Coupled (FC) module (Module); as shown in Figure 5B, it is the output optical power conversion efficiency of the optical fiber output blue laser (power conversion efficiency, PCE), and the wavelength is 450nm, the diameter (d) of the core 41 is 105um, and the numerical aperture≦NA0.12 is the condition to form a Fibre Coupled (FC) module (Module), but it is not limited to this .

In summary, the technical means disclosed in this creation do have new patent requirements such as "novelty", "progressiveness" and "available for industrial use". I pray that the Jun Bureau will grant patents to encourage creation without any responsibility. Sense of virtue.

However, the above-mentioned diagrams and descriptions are only the preferred embodiments of this creation. Anyone familiar with the art, modifications or equivalent changes made in accordance with the spirit of this case should still be included in the scope of the patent application in this case.

10: Shell 101: The side of the shell 11: Seat 111: Groove 1111: The side of the groove 112: steps 12: capping 20: Laser diode 21: Complex beam 22: Laser chip 221: Resonant Cavity 222: Mirror 223: reflective film 30: Optical lens assembly 31: fast axis collimator 32: Slow axis collimator 33: mirror 34: Focusing lens 40: Optical fiber 41: Fiber Nucleus 42: Low numerical aperture 43: fiber end face 44: Fiber output 45: Transparent window mirror 46: hermetic solder 50: optical software S: Space L: combined beam d: diameter α: Output light cone angle

Figure 1 is an uncovered three-dimensional view of this creation. Figure 2A is an uncovered view of this creation. Fig. 2B is an enlarged view of 2B shown in Fig. 2A. Figure 2C is a schematic diagram of the creative laser chip. Figure 3A is a three-dimensional view of this creation with its cover. Fig. 3B is a cross-sectional view of 3B-3B in Fig. 3A. Figure 3C is a schematic diagram of the creative optical fiber. Figure 3D is a schematic diagram of this creative transparent window mirror with air-tight solder. Figure 4 is a schematic diagram of the spatial beam combining of 8 blue lasers in this creation. Figure 5A is a graph of the output optical power versus current of the optical fiber output blue laser of this invention. Figure 5B is a graph of the output optical power conversion efficiency of the original optical fiber output blue laser.

40: Optical fiber

41: Fiber Nucleus

42: Low numerical aperture

43: end face

d: diameter

α: Output light cone angle

Claims (10)

A low numerical aperture fiber output diode laser module, including: A shell A complex laser diode, which is located in the housing and excites a complex light beam; An optical lens assembly, which is located in the housing, and after collimating the light beams separately, they are combined into a combined light beam in space; and An optical fiber has a core, and the output of the optical fiber is set to a low numerical aperture, and the optical fiber is combined on the side of the housing, so that the combined light beam can be coupled to the core to the low numerical aperture. The low numerical aperture fiber output diode laser module of claim 1, wherein the core diameter is 105um; the low numerical aperture is 0.12. The low numerical aperture fiber output diode laser module according to claim 1, wherein the fiber uses a high hydroxyl value. The low numerical aperture optical fiber output diode laser module according to claim 1, wherein the end face of the optical fiber adopts a beam cutting method. The low numerical aperture optical fiber output diode laser module of claim 1, wherein the optical fiber output end adopts a transparent window mirror, and the transparent window mirror is matched with an air-tight solder. The low numerical aperture fiber output diode laser module of claim 1, wherein the laser diode includes a laser chip, the laser chip has a resonant cavity, and the end surface of the resonant cavity forms a mirror surface It can be coated with a reflective film, and the reflectivity of the reflective film is ≧20%. The low numerical aperture fiber output diode laser module according to claim 1, wherein there are at least 8 laser diodes. The low numerical aperture fiber output diode laser module according to claim 1, wherein the wavelength of the laser diode is 450 nm. The low-numerical aperture fiber output diode laser module described in any one of claims 1 to 8, wherein the optical lens assembly includes a plurality of fast-axis collimators, a plurality of slow-axis collimators, and a complex mirror , And each of the light beams is collimated by each of the fast-axis collimator lens and each of the slow-axis collimator lens respectively, and after passing through each of the reflecting mirrors, they are combined into a combined light beam in space, and the combined light beam can be coupled through the focusing lens To the nucleus. The low numerical aperture fiber output diode laser module of claim 9, wherein the housing includes a base and a cover, the base is provided with a groove, the groove has a step, and the step can be To support each of the laser diodes so that the laser diodes can be arranged in parallel, and each of the fast-axis collimating mirrors is arranged on the step, and is close to the front of each of the laser diodes, Each of the slow axis collimating mirrors and each of the reflecting mirrors are arranged on the groove, and each of the slow axis collimating mirrors is arranged in front of each of the fast axis collimating mirrors, and each of the reflecting mirrors is arranged on each of the slow axis. In front of the collimating lens, the focusing lens is arranged on the side of each reflecting mirror and the focusing lens is combined with the side surface of the groove, and the position of the focusing lens corresponds to the position of the fiber core.

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