CN210577001U - Optical fiber laser - Google Patents
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- CN210577001U CN210577001U CN201921805609.0U CN201921805609U CN210577001U CN 210577001 U CN210577001 U CN 210577001U CN 201921805609 U CN201921805609 U CN 201921805609U CN 210577001 U CN210577001 U CN 210577001U
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Abstract
The embodiment of the utility model provides a fiber laser, gain fiber's length is in predetermineeing the within range, and predetermine the refracting index that the fibre core of optic fibre is greater than the refracting index of inner cladding in the fiber laser, and the refracting index of inner cladding is greater than the refracting index of surrounding layer, can make the pump light not completely absorbed by the gain medium, and the laser that unabsorbed pump light and gain fiber gain produced exports simultaneously in inner cladding and the fibre core respectively. Moreover, when the laser is used for welding the target to be welded, the pump light and the laser are output simultaneously, the pump light is used for preheating before welding, the laser is used for welding, the welding can be carried out while preheating, the pump light and the laser are fully utilized, and the welding cost can be saved.
Description
Technical Field
The utility model relates to a laser technical field, more specifically relates to fiber laser.
Background
The optical fiber laser is a system or light source formed by combining various optical fiber devices, the basic technology of the application is a doped optical fiber amplifier technology, and the working medium generally adopts optical fiber doped with certain active ions or only applies the nonlinear effect of the working medium. Therefore, compared with other common lasers, the fiber laser has the advantages of higher light-light conversion efficiency, narrower line width, lower threshold value, full-fiber structure and the like.
The fiber laser in the prior art can only output laser with one wavelength, which causes that when the fiber laser is used as a light source for laser welding, an additional light source needs to be introduced to preheat a target to be welded, and the cost of laser welding is increased.
Therefore, it is urgently needed to provide a fiber laser.
SUMMERY OF THE UTILITY MODEL
To overcome the above problems or at least partially solve the above problems, embodiments of the present invention provide a fiber laser.
In a first aspect, an embodiment of the present invention provides a fiber laser, which includes: the device comprises an optical fiber coupler, N pumping sources, a resonant cavity, a gain optical fiber and an optical fiber beam combiner;
the resonant cavity consists of a fiber grating with a first reflectivity and a fiber grating with a second reflectivity, wherein the first end of the fiber grating with the first reflectivity is welded with the first end of the gain fiber, and the first end of the fiber grating with the second reflectivity is welded with the second end of the gain fiber; wherein the first reflectivity is greater than the second reflectivity;
the first side of the optical fiber coupler comprises 1 path of optical fiber, the second side of the optical fiber coupler comprises N +1 paths of optical fibers, and the 1 path of optical fiber on the first side of the optical fiber coupler is welded with the second end of the optical fiber grating with the second reflectivity; n optical fibers in the N +1 optical fibers on the second side of the optical fiber coupler are respectively in one-to-one corresponding fusion joint with the output ends of the N pumping sources, 1 optical fiber except the N optical fibers in the N +1 optical fibers on the second side of the optical fiber coupler is used as a laser output end, wherein N is a positive integer;
the first side of the optical fiber combiner comprises 1 path of optical fibers, the second side of the optical fiber combiner comprises 2 paths of optical fibers, and the 1 path of optical fibers on the first side of the optical fiber combiner are used as the output end of the optical fiber laser; the 1 st optical fiber at the second side of the optical fiber combiner is welded with the laser output end, and the 2 nd optical fiber at the second side of the optical fiber combiner is welded with the second end of the fiber grating with the first reflectivity;
the length of the gain optical fiber is within a preset range, a preset optical fiber in the optical fiber laser comprises a fiber core, an inner cladding and an outer cladding, the refractive index of the fiber core is larger than that of the inner cladding, and the refractive index of the inner cladding is larger than that of the outer cladding; the preset optical fibers are all optical fibers except the optical fibers between the N pumping sources and the optical fiber coupler.
Preferably, the gain fiber is an ytterbium-doped fiber.
Preferably, the core is doped with germanium or doped with phosphorus and the outer cladding is doped with fluorine.
Preferably, N has a value of 6.
Preferably, the pump source is a laser diode.
Preferably, the wavelength of the pump source is 915 nm.
Preferably, the first reflectance is 99% or more and the second reflectance is 10% or less.
Preferably, the fiber grating of the first reflectivity and the fiber grating of the second reflectivity are both fiber bragg gratings.
In a second aspect, an embodiment of the present invention provides a fiber laser, including: the device comprises an optical fiber coupler, M pumping sources, a resonant cavity and a gain optical fiber;
the resonant cavity consists of a fiber grating with a first reflectivity and a fiber grating with a second reflectivity, wherein the first end of the fiber grating with the first reflectivity is welded with the first end of the gain fiber, and the first end of the fiber grating with the second reflectivity is welded with the second end of the gain fiber; wherein the first reflectivity is greater than the second reflectivity;
the first side of the optical fiber coupler comprises M +1 paths of optical fibers, the second side of the optical fiber coupler comprises 1 path of optical fibers, and M paths of optical fibers in the M +1 paths of optical fibers on the first side of the optical fiber coupler are respectively in one-to-one correspondence fusion with the output ends of the M pumping sources; the 1 path of optical fiber at the second side of the optical fiber coupler is welded with the second end of the optical fiber grating with the first reflectivity; the second end of the fiber grating with the second reflectivity is used as the output end of the fiber laser, wherein M is a positive integer;
the length of the gain optical fiber is within a preset range, a preset optical fiber in the optical fiber laser comprises a fiber core, an inner cladding and an outer cladding, the refractive index of the fiber core is larger than that of the inner cladding, and the refractive index of the inner cladding is larger than that of the outer cladding; the preset optical fibers are all optical fibers except the optical fibers between the N pumping sources and the optical fiber coupler.
The embodiment of the utility model provides a fiber laser, gain fiber's length is in predetermineeing the within range, and predetermine the refracting index that the fibre core of optic fibre is greater than the refracting index of inner cladding in the fiber laser, and the refracting index of inner cladding is greater than the refracting index of surrounding layer, can make the pump light not completely absorbed by the gain medium, and the laser that unabsorbed pump light and gain fiber gain produced exports simultaneously in inner cladding and the fibre core respectively. Moreover, when the laser is used for welding the target to be welded, the pump light and the laser are output simultaneously, the pump light is used for preheating before welding, the laser is used for welding, the welding can be carried out while preheating, the pump light and the laser are fully utilized, and the welding cost can be saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical fiber laser provided in an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a preset optical fiber in an optical fiber laser according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a refractive index of a preset optical fiber in an optical fiber laser according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an optical fiber laser according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a fiber laser, including: the device comprises an optical fiber coupler 1, N pumping sources 2, a resonant cavity 3, a gain optical fiber 4 and an optical fiber combiner 5;
the resonant cavity 3 is composed of a fiber grating 31 with a first reflectivity and a fiber grating 32 with a second reflectivity, the gain fiber 4 is arranged in the resonant cavity 3, a first end of the fiber grating 31 with the first reflectivity is welded with a first end of the gain fiber 4, and a first end of the fiber grating 32 with the second reflectivity is welded with a second end of the gain fiber 4; wherein the first reflectivity is greater than the second reflectivity;
the optical fiber coupler 1 is arranged on one side of the optical fiber grating 32 with the second reflectivity outside the resonant cavity 3, the first side of the optical fiber coupler 1 comprises 1 path of optical fiber, the second side of the optical fiber coupler 1 comprises N +1 paths of optical fibers, and the 1 path of optical fiber on the first side of the optical fiber coupler 1 is welded with the second end of the optical fiber grating 32 with the second reflectivity; n optical fibers in the N +1 optical fibers on the second side of the optical fiber coupler 1 are respectively in one-to-one correspondence fusion with the output ends of the N pumping sources 2, and 1 optical fiber except the N optical fibers in the N +1 optical fibers on the second side of the optical fiber coupler 1 is taken as a laser output end, wherein N is a positive integer;
the first side of the optical fiber combiner 5 comprises 1 path of optical fiber, the second side of the optical fiber combiner 5 comprises 2 paths of optical fiber, and the 1 path of optical fiber on the first side of the optical fiber combiner 5 is used as the output end of the optical fiber laser; the 1 st optical fiber at the second side of the optical fiber combiner 5 is welded with the laser output end, and the 2 nd optical fiber at the second side of the optical fiber combiner 5 is welded with the second end of the fiber grating 31 with the first reflectivity;
the length of the gain fiber 4 is within a preset range, the preset fiber in the fiber laser comprises a fiber core, an inner cladding and an outer cladding, the refractive index of the fiber core is greater than that of the inner cladding, and the refractive index of the inner cladding is greater than that of the outer cladding; the preset optical fibers are all optical fibers except the optical fibers between the N pumping sources 2 and the optical fiber coupler 1, and the gain optical fibers are also the preset optical fibers.
Specifically, the embodiment of the present invention provides a fiber laser, which is a reverse cladding pumped fiber laser. A fiber grating 31 of a first reflectivity and a fiber grating 32 of a second reflectivity constituting the resonant cavity 3, both the first reflectivity and the second reflectivity being for laser light generated through gain of the gain fiber, not for pump light.
It should be noted that, in the embodiment of the present invention, an optical fiber coupler of (N +1) × 1 is adopted, and in fig. 1, the value of N is 6 as an example for explanation, and the optical fiber coupler 1 is an optical fiber coupler of (6+1) × 1. Correspondingly, the optical fiber laser comprises 6 pump sources 2 which are respectively welded with the non-output ends on the second side of the optical fiber coupler in a one-to-one correspondence mode. The pump source can be selected according to the wavelength of the pump light, which is not limited in the embodiments of the present invention.
After being combined by the optical fiber coupler 1, the pumping light generated by the 6 pumping sources 2 is output to the resonant cavity, is gained by the gain medium in the resonant cavity to generate laser, and is output to the optical fiber combiner 5 through the laser output end at the second side of the optical fiber coupler 1.
The embodiment of the utility model provides an in, the length of gain optic fibre 4 is in presetting the within range, and the length range that the gain optic fibre that the predetermined scope indicates that the absorption coefficient to the pump light through the gain optic fibre calculates the gain optic fibre that obtains makes the pump absorption of gain optic fibre be 3dB to 10dB, and the pump light that is not absorbed by the gain optic fibre at this moment jets out from the fiber grating 31 of first reflectivity to input to in the 2 nd way optic fibre of the second side of optical fiber beam combiner 5. In the optical fiber combiner 5, laser light generated by gain of the gain fiber is combined with pump light not absorbed by the gain fiber, and is output from 1 optical fiber on the first side of the optical fiber combiner 5. That is, not only the gain-fiber-gain-generated laser light but also the unabsorbed pump light are output from the output end of the fiber laser.
As shown in fig. 2 and fig. 3, fig. 2 is a schematic cross-sectional view of a preset optical fiber in an optical fiber laser according to an embodiment of the present invention; fig. 3 is a schematic diagram illustrating a refractive index of a predetermined optical fiber in an optical fiber laser according to an embodiment of the present invention. The predetermined optical fiber 0 includes a core 03, an inner cladding 02 and an outer cladding 01, the refractive index n1 of the core 03 is greater than the refractive index n2 of the inner cladding 02, and the refractive index n2 of the inner cladding 02 is greater than the refractive index n3 of the outer cladding 01. The principle that the fiber laser generates laser is cladding pumping, the refractive index of the fiber core of the gain fiber is larger than that of the inner cladding, the refractive index of the inner cladding is larger than that of the outer cladding, and therefore total reflection transmission of pump light which is not absorbed in the inner cladding of the gain fiber can be achieved, and total reflection transmission in the inner cladding of the preset fiber except the gain fiber can be achieved. The laser generated by gain of the gain medium realizes total reflection transmission in the fiber core of the gain optical fiber, and realizes total reflection transmission in the fiber core of the preset optical fiber except the gain optical fiber, and finally realizes separation and simultaneous output of the pump light and the laser.
The embodiment of the utility model provides an in the fiber laser that provides, the length of gain optic fibre is in predetermineeing the within range, and predetermines the refracting index that the fibre core of optic fibre is greater than the refracting index of inner cladding in the fiber laser, and the refracting index of inner cladding is greater than the refracting index of surrounding layer, can make the pump light not completely absorbed by the gain optic fibre, and the laser that unabsorbed pump light and gain optic fibre gain produced exports simultaneously in inner cladding and fibre core respectively. Moreover, when the laser is used for welding the target to be welded, the pump light and the laser are output simultaneously, the pump light is used for preheating before welding, the laser is used for welding, the welding can be carried out while preheating, the pump light and the laser are fully utilized, and the welding cost can be saved.
On the basis of the above embodiment, the embodiment of the present invention provides an optical fiber laser, wherein the gain fiber is an ytterbium-doped fiber.
Specifically, in the embodiment of the present invention, the gain fiber adopted by the fiber laser may specifically be a ytterbium-doped fiber, that is, the fiber core of the gain fiber is doped with ytterbium ions. When the wavelength of the pumping light generated by the pumping source is 915nm, laser with the wavelength of 1080nm can be generated after the ytterbium-doped optical fiber gains, at the moment, the laser with the wavelength of 1080nm can be used for welding a target to be welded, and the laser with the wavelength of 915nm can be used for preheating the target to be welded during welding.
On the basis of the above embodiments, in the embodiment of the present invention, the core diameter of the predetermined optical fiber may be 20 μm, the inner cladding diameter may be 400 μm, and the outer cladding diameter may be 440 μm.
On the basis of the above embodiments, the fiber laser provided in the embodiments of the present invention is configured such that the fiber core of the predetermined optical fiber is doped with germanium or phosphorus, and the outer cladding is doped with fluorine.
Specifically, since the refractive index can be increased by doping germanium or phosphorus in the quartz, and the refractive index can be decreased by doping fluorine in the quartz, in order to achieve that the refractive index of the core of the predetermined optical fiber is greater than the refractive index of the inner cladding, and the refractive index of the inner cladding is greater than the refractive index of the outer cladding, the core of the predetermined optical fiber is doped with germanium or phosphorus, the inner cladding is not doped, and the outer cladding is doped with fluorine.
It should be noted that the same is also applicable if the gain fiber is an ytterbium-doped fiber, i.e., the core of the ytterbium-doped fiber is doped with germanium or phosphorus, the inner cladding is undoped, and the outer cladding is doped with fluorine. At this time, the core of the ytterbium-doped fiber is doped with ytterbium ions and germanium or with ytterbium ions and phosphorus.
On the basis of the above embodiments, in the fiber Laser provided in the embodiments of the present invention, the pump source is a Laser Diode (LD).
On the basis of the above embodiment, the embodiment of the present invention provides an optical fiber laser, where the first reflectivity is greater than or equal to 99%, and the second reflectivity is less than or equal to 10%, so as to fully realize the function of the resonant cavity. For example, the first reflectance may be set to 99% and the second reflectance may be set to 10%.
On the basis of the above-mentioned embodiment, the embodiment of the utility model provides an in the fiber laser that provides, the fiber grating of first reflectivity and the fiber grating of second reflectivity are the optic fibre bragg grating. The fiber grating 31 of the first reflectivity and the fiber grating 32 of the second reflectivity may be a broadband fiber bragg grating or a narrowband fiber bragg grating.
As shown in fig. 4, on the basis of the above embodiment, the optical fiber laser provided in the embodiment of the present invention includes: the device comprises an optical fiber coupler 7, M pumping sources 6, a resonant cavity 8 and a gain optical fiber 9;
the resonant cavity 8 is composed of a fiber grating 81 with a first reflectivity and a fiber grating 82 with a second reflectivity, a first end of the fiber grating 81 with the first reflectivity is welded with a first end of the gain fiber 9, and a first end of the fiber grating 82 with the second reflectivity is welded with a second end of the gain fiber 9; wherein the first reflectivity is greater than the second reflectivity;
the first side of the optical fiber coupler 7 comprises M +1 paths of optical fibers, the second side of the optical fiber coupler 7 comprises 1 path of optical fibers, and M paths of optical fibers in the M +1 paths of optical fibers on the first side of the optical fiber coupler 7 are respectively in one-to-one corresponding fusion with the output ends of the M pumping sources 6; the 1 path of optical fiber at the second side of the optical fiber coupler 7 is welded with the second end of the optical fiber grating 81 with the first reflectivity; a second end of the fiber grating 82 with the second reflectivity is used as an output end of the fiber laser, wherein M is a positive integer;
the length of the gain fiber 9 is within a preset range, the preset fiber in the fiber laser comprises a fiber core, an inner cladding and an outer cladding, the refractive index of the fiber core is greater than that of the inner cladding, and the refractive index of the inner cladding is greater than that of the outer cladding; the preset optical fibers are all optical fibers except the optical fibers between the N pumping sources 6 and the optical fiber coupler 7.
Specifically, the embodiment of the present invention provides a parameter and a structure of each part in the fiber laser provided in the embodiment of the present invention are the same as those of each part in the fiber laser provided in the embodiment of the present invention, the realized effect is also the same, and the difference is only in the embodiment of the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (9)
1. A fiber laser, comprising: the device comprises an optical fiber coupler, N pumping sources, a resonant cavity, a gain optical fiber and an optical fiber beam combiner;
the resonant cavity consists of a fiber grating with a first reflectivity and a fiber grating with a second reflectivity, wherein the first end of the fiber grating with the first reflectivity is welded with the first end of the gain fiber, and the first end of the fiber grating with the second reflectivity is welded with the second end of the gain fiber; wherein the first reflectivity is greater than the second reflectivity;
the first side of the optical fiber coupler comprises 1 path of optical fiber, the second side of the optical fiber coupler comprises N +1 paths of optical fibers, and the 1 path of optical fiber on the first side of the optical fiber coupler is welded with the second end of the optical fiber grating with the second reflectivity; n optical fibers in the N +1 optical fibers on the second side of the optical fiber coupler are respectively in one-to-one corresponding fusion joint with the output ends of the N pumping sources, 1 optical fiber except the N optical fibers in the N +1 optical fibers on the second side of the optical fiber coupler is used as a laser output end, wherein N is a positive integer;
the first side of the optical fiber combiner comprises 1 path of optical fibers, the second side of the optical fiber combiner comprises 2 paths of optical fibers, and the 1 path of optical fibers on the first side of the optical fiber combiner are used as the output end of the optical fiber laser; the 1 st optical fiber at the second side of the optical fiber combiner is welded with the laser output end, and the 2 nd optical fiber at the second side of the optical fiber combiner is welded with the second end of the fiber grating with the first reflectivity;
the length of the gain optical fiber is within a preset range, the preset optical fiber in the optical fiber laser comprises a fiber core, an inner cladding and an outer cladding, the refractive index of the fiber core is greater than that of the inner cladding, and the refractive index of the inner cladding is greater than that of the outer cladding; the preset optical fibers are all optical fibers except the optical fibers between the N pumping sources and the optical fiber coupler.
2. The fiber laser of claim 1, wherein the gain fiber is an ytterbium-doped fiber.
3. The fiber laser of claim 1, wherein the core is doped with germanium or doped with phosphorus and the outer cladding is doped with fluorine.
4. The fiber laser of claim 1, wherein N has a value of 6.
5. The fiber laser of claim 1, wherein the pump source is a laser diode.
6. The fiber laser of claim 1, wherein the pump source has a wavelength of 915 nm.
7. The fiber laser of claim 1, wherein the first reflectivity is 99% or greater and the second reflectivity is 10% or less.
8. The fiber laser of claim 1, wherein the first and second reflectivity fiber gratings are fiber bragg gratings.
9. A fiber laser, comprising: the device comprises an optical fiber coupler, M pumping sources, a resonant cavity and a gain optical fiber;
the resonant cavity consists of a fiber grating with a first reflectivity and a fiber grating with a second reflectivity, wherein the first end of the fiber grating with the first reflectivity is welded with the first end of the gain fiber, and the first end of the fiber grating with the second reflectivity is welded with the second end of the gain fiber; wherein the first reflectivity is greater than the second reflectivity;
the first side of the optical fiber coupler comprises M +1 paths of optical fibers, the second side of the optical fiber coupler comprises 1 path of optical fibers, and M paths of optical fibers in the M +1 paths of optical fibers on the first side of the optical fiber coupler are respectively in one-to-one correspondence fusion with the output ends of the M pumping sources; the 1 path of optical fiber at the second side of the optical fiber coupler is welded with the second end of the optical fiber grating with the first reflectivity; the second end of the fiber grating with the second reflectivity is used as the output end of the fiber laser, wherein M is a positive integer;
the length of the gain optical fiber is within a preset range, the preset optical fiber in the optical fiber laser comprises a fiber core, an inner cladding and an outer cladding, the refractive index of the fiber core is greater than that of the inner cladding, and the refractive index of the inner cladding is greater than that of the outer cladding; the preset optical fibers are all optical fibers except the optical fibers between the N pumping sources and the optical fiber coupler.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113714634A (en) * | 2020-05-25 | 2021-11-30 | 深圳市创鑫激光股份有限公司 | Laser processing system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113714634A (en) * | 2020-05-25 | 2021-11-30 | 深圳市创鑫激光股份有限公司 | Laser processing system and method |
| CN113714634B (en) * | 2020-05-25 | 2023-10-31 | 深圳市创鑫激光股份有限公司 | Laser processing system and method |
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