Optical fiber output large-power semiconductor laser module

[0034] As a specific embodiment, the welding bracket 12 , the AlN heat sink 13 and the laser chip 14 are welded and fixed by metal solder. As an embodiment, Au80Sn20 (gold-tin alloy) solder is used for welding between the laser chip 14 and the AlN heat sink 13, and PbSn (lead-tin alloy) solder is used for welding between the AlN heat sink 13 and the welding bracket 12, The welding bracket 12 and the metal tube shell 11 are welded with In (indium) solder, thereby realizing that all the components inside the metal tube shell 11 are fixed by metal solder welding, that is, the glue-free welding and fixing are realized, thereby The influence of organic matter volatilization on the reliability of the laser chip is reduced. In particular, Au80Sn20 solder is used for welding between the laser chip 14 and the AlN heat sink 13 , and the Au80Sn20 solder has relatively stable characteristics under high and low temperature cycle conditions, so effective welding between the laser chip 14 and the AlN heat sink 13 can be achieved. .

[0035] As a specific example, please refer to Figure 4 As shown, the metallized optical fiber 2 includes an output optical fiber 21 and a self-focusing lens optical fiber 22. The self-focusing lens optical fiber 22 includes a self-focusing optical fiber 221 and a lens 222 polished on one end of the self-focusing optical fiber 221. The other end face of the self-focusing optical fiber 221 is fused to the output optical fiber 21 , the aperture of the self-focusing lens optical fiber 22 is larger than that of the output optical fiber 21 , and the aperture of the self-focusing lens optical fiber 22 matches the width of the light-emitting area of ​​the laser chip 14 . Specifically, the lens 222 on one end face of the self-focusing optical fiber 221 is formed by grinding and polishing, and the aperture of the lens 222 is equal to that of the self-focusing optical fiber 221, that is, the aperture of the self-focusing optical fiber 221 is the aperture of the self-focusing lens optical fiber 22, Then, the other end face of the self-focusing optical fiber 221 is spliced ​​with the output optical fiber 21 , and finally the fused optical fiber is metallized to form the metallized optical fiber 2 . In this embodiment, the aperture of the self-focusing lens optical fiber 22 is larger than that of the output optical fiber 21, and the aperture of the self-focusing lens optical fiber 22 is matched with the width of the light-emitting area of ​​the laser chip 14, so as to maintain the laser chip The coupling efficiency is improved under the condition that the width of the light-emitting region remains unchanged.

[0036] As a preferred embodiment, the fusion point between the other end face of the self-focusing optical fiber 221 and the output optical fiber 21 is located at the focal point of the self-focusing optical fiber 221 , so that light with maximum energy can be collected from the laser chip 14 .

[0037] As a preferred embodiment, the lens 222 polished on one end face of the self-focusing optical fiber 221 is hemispherical, so that the numerical aperture of the self-focusing optical fiber can be increased.

[0038] As a preferred embodiment, the radius of the hemispherical lens 222 is 300-400 microns, so that the coupling efficiency can be improved.

[0039] As a specific example, please refer to Figure 5 As shown, the optical fiber support 3 includes an optical fiber fixing part 31 and a laser welding part 32 located on both sides of the optical fiber fixing part 31. The matching U-shaped groove 311 can prevent the self-focusing fiber 221 from being displaced in the radial direction of the groove 311 when the self-focusing fiber 221 is welded and fixed to the groove 311, so as to achieve better performance. Welding to ground. The optical fiber support 3 is welded and fixed on the welding support 12 by the laser welding part 32, and a plurality of laser welding spots 321 are also arranged on the laser welding part 32, and the laser welding spots 321 are laser welded. Forming.

[0040] As a preferred embodiment, the fiber holder 3 is made of N6 (nickel material) and is provided with a U-shaped groove, thereby improving the reliability of the fiber fixing point at high and low temperatures.

[0041] As a preferred embodiment, the self-focusing optical fiber is welded and fixed in the U-shaped groove of the optical fiber fixing part using Au80Sn20 solder, so that the long-term stability of the welding point can be improved.

[0042] As a specific embodiment, both the optical fiber support and the welding support and between the self-focusing lens optical fiber and the fiber support are welded and fixed by a laser welding process. Specifically, after all the components inside the semiconductor laser module 1 to be coupled are welded and assembled, the semiconductor laser module 1 to be coupled and the metallized fiber 2 are coupled and aligned, that is, the self-focusing lens fiber 22 The front lens 222 is coupled and aligned with the laser chip 14 (belongs to active alignment), and is detected by a power meter connected to the output fiber 21. When it is detected that the coupling efficiency reaches the maximum, laser welding is used to The welding bracket 12 and the laser welding part 32 of the optical fiber bracket 3 are welded and fixed, and then metal solder is used to weld and fix the self-focusing optical fiber 221 of the metallized optical fiber 2 and the groove 311 of the optical fiber bracket 3, and finally complete The invention provides the manufacture of the optical fiber output high-power semiconductor laser module.