CN106959489B - High-power optical fiber end cap based on tapered optical fiber - Google Patents
High-power optical fiber end cap based on tapered optical fiber Download PDFInfo
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- CN106959489B CN106959489B CN201710377180.9A CN201710377180A CN106959489B CN 106959489 B CN106959489 B CN 106959489B CN 201710377180 A CN201710377180 A CN 201710377180A CN 106959489 B CN106959489 B CN 106959489B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/241—Light guide terminations
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/262—Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4439—Auxiliary devices
Abstract
A high-power optical fiber end cap based on a tapered optical fiber comprises the tapered optical fiber, a quartz block and an end cap shell; the large end of the tapered optical fiber penetrates into the end cap shell from one end of the end cap shell and is fixed on the end cap shell, the other end of the end cap shell is provided with a cavity for a quartz block to extend into, one end of the quartz block extending into the end cap shell is a cone frustum-shaped end, one end of the quartz block extending out of the end cap shell is cylindrical, and an antireflection film is plated on the end face of the cylindrical end of the quartz block extending out of the end cap shell; inside the end cap shell, the frustum of a cone shape end of quartz piece and the butt fusion of the big end of toper optic fibre, be provided with output end cap protection window on the end cap shell of the one end outside the quartz piece stretches out the end cap shell, the cylinder end that output end cap protection window stretches out the quartz piece outside the end cap shell seals inside it. The invention has simple structure, can improve the laser power bearing capacity in the optical fiber, effectively inhibits the nonlinear effect and simultaneously keeps good laser beam quality.
Description
Technical Field
The invention belongs to the field of optical fiber lasers, and relates to a high-power optical fiber end cap based on a tapered optical fiber.
Background
In the late stage of the eighties of the twentieth century, with the maturity of optical fiber manufacturing process and the development of solid laser, optical fiber lasers begin to become research hotspots, and with the gradual maturity of double-clad optical fiber and cladding pumping technology, high-power optical fiber lasers begin to make breakthrough progress. Since the fiber laser has the advantages of small volume, light weight, convenient thermal management, good beam quality and the like, in recent years, the high-power fiber laser output by the optical fiber has been widely applied in the fields of optical communication, material processing, medical diagnosis and treatment, information storage, laser printing, laser measurement and control, laser spectroscopy, nonlinear frequency conversion and the like.
Along with the continuous improvement of the output power of the optical fiber laser, the power density in the fiber core of the optical fiber is also continuously increased. In the process of cutting, grinding, polishing and other treatments, the output end face of the optical fiber inevitably leaves defects and damages on the end face of the optical fiber, so that a local electric field is strengthened to cause material damage, and therefore, in a high-power optical fiber laser system, the treatment of the output end face of the optical fiber is an important core technology. The optical fiber end cap is a high-power optical fiber passive device for realizing the protection of the optical fiber end face, and the optical power density of the output end is reduced by expanding the beam of the output optical fiber, so that the optical fiber end face is protected from being damaged.
The traditional optical fiber end cap uses common optical fibers with uniform fiber core sizes to be welded with the beam expanding quartz block to achieve the effects of expanding beams and protecting the output end face. In order to maintain the quality of the light beam, the size of the energy transmission fiber in the fiber end cap is generally consistent with that of the output fiber of the laser, and the fiber with the length of 10-20 meters or more is generally required in industrial application, which causes the nonlinear effect in the energy transmission fiber to be generated, and the use of the laser is seriously influenced. In the nonlinear effect in the optical fiber, stimulated raman scattering and stimulated brillouin scattering are dominant. The threshold values of the two nonlinear effects are closely related to the length of the optical fiber in the optical fiber system, and after the end cap is added, the interaction distance of the nonlinear effects in the optical fiber core is lengthened due to the increase of the whole optical fiber length, so that the threshold value of the nonlinear effects is greatly reduced, and the application of the traditional optical fiber end cap in a high-power optical fiber laser system, particularly a single-mode high-beam-quality optical fiber laser system is limited.
On the other hand, in the high-power fiber laser system, the cladding light inevitably remains due to incomplete absorption of the pump light, bending of the fiber, and the like. Outputting cladding light along with the signal light reduces the overall quality of the output beam and therefore the cladding light also needs to be stripped in the output system.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the high-power optical fiber end cap based on the tapered optical fiber, which has a simple structure, can improve the bearing capacity of the fiber core laser output, effectively inhibits the nonlinear effect and effectively keeps the quality of a laser beam.
The technical scheme of the invention is as follows:
a high-power optical fiber end cap based on a tapered optical fiber comprises the tapered optical fiber, a quartz block and an end cap shell; the large end of the tapered optical fiber penetrates into the end cap shell from one end of the end cap shell and is fixed on the end cap shell, the other end of the end cap shell is provided with a cavity for a quartz block to extend into, one end of the quartz block extending into the end cap shell is a cone frustum-shaped end, one end of the quartz block extending out of the end cap shell is cylindrical, and an antireflection film is plated on the end face of the cylindrical end of the quartz block extending out of the end cap shell; inside the end cap shell, the frustum of a cone shape end of quartz piece and the butt fusion of the big end of toper optic fibre, be provided with output end cap protection window on the end cap shell of the one end outside the quartz piece stretches out the end cap shell, the cylinder end that output end cap protection window stretches out the quartz piece outside the end cap shell seals inside it.
The tapered fiber is characterized in that the diameter of the fiber core of the fiber is gradually increased along with the change of the length of the fiber, and can be a rare earth particle doped gain fiber and a common undoped energy transmission fiber. According to the diameter of the fiber core, two ends of the tapered optical fiber can be divided into a large end and a small end, wherein the large end of the tapered optical fiber is the large end, and the small end of the tapered optical fiber is the small end. The small end is welded with the output optical fiber of the optical fiber laser system outside the shell of the end cap, and the big end is welded with the quartz block inside the shell of the end cap. The tapered optical fiber can be a single-cladding tapered optical fiber, a double-cladding tapered optical fiber, or a multi-cladding tapered optical fiber, i.e., the cladding has three or more layers. The single-cladding tapered optical fiber is composed of a fiber core, an inner cladding and a coating layer, the inner cladding and the coating layer are sequentially arranged on the outer surface of the fiber core from inside to outside, the diameters of the fiber core and the inner cladding are linearly increased along with the increase of the length of the optical fiber, and the thickness of the coating layer is fixed and does not change along with the length of the optical fiber. The double-cladding tapered optical fiber is composed of a fiber core, an inner cladding, an outer cladding and a coating layer, the inner cladding, the outer cladding and the coating layer are sequentially arranged on the outer surface of the fiber core, the diameters of the fiber core and the inner cladding are linearly increased along with the increase of the length of the optical fiber, and the thicknesses of the outer cladding and the coating layer are fixed and do not change along with the length of the optical fiber.
For the double-clad tapered fiber, the coating of one end of the double-clad tapered fiber extending into the end cap shell needs to be removed before the end of the double-clad tapered fiber extends into the end cap shell, namely, the double-clad tapered fiber extending into the end cap shell is a section of fiber with the coating removed. And coating and curing the surface of the optical fiber with the coating layer removed by using ultraviolet curing glue to form a cladding light stripper.
The end cap housing of the present invention is used to secure the tapered fiber, quartz block, and output end cap protective window. A flowing coolant may be provided within the end cap housing to assist in heat dissipation. The inner part of the end cap shell is a cavity, the big end of the tapered optical fiber extends into the cavity in the end cap shell from one end of the end cap shell, the cone-frustum-shaped end of the quartz block extends into the cavity in the end cap shell from the other end of the end cap shell, and the cone-frustum-shaped end of the quartz block is welded with the big end of the tapered optical fiber in the cavity in the end cap shell; and a cooling liquid input interface and a cooling liquid output interface are arranged on the side wall of the end cap shell, cooling liquid enters the cavity in the end cap shell from the cooling liquid input interface and flows out from the cooling liquid output interface, and flowing cooling liquid is formed in the end cap shell.
The basic principle of the invention is as follows:
in a high-power fiber laser system, stimulated inelastic scattering, i.e., stimulated raman scattering (SRS for short) and stimulated brillouin scattering (SBS for short), is an important factor that limits power enhancement. The threshold equations for SRS and SBS are summarized in the book "nonlinear fiber optics principles and applications" by g.p. agrawal, published by the electronics industry press, as follows:
wherein, g R And g B Respectively a raman gain coefficient and a brillouin gain coefficient. A. The eff Is the effective cross-sectional area, L, of the optical fiber eff Is the effective length of the optical fiber. Under a certain condition of optical fiber material, the gain coefficients of Raman and Brillouin scattering are constant, and the threshold values of the two nonlinear effects are proportional to the effective sectional area of the optical fiber and inversely proportional to the effective length of the optical fiber. The optical fiber commonly used in the optical fiber end cap (commonly referred to as pigtail) is an energy-transmitting fiber that matches the size of the optical fiber of the fiber optic system, and the addition of pigtail increases the effective length of the system fiber and lowers the threshold for nonlinear effects. In the tapered optical fiber, the size of the small end of the tapered optical fiber can be kept consistent with that of an optical fiber laser system, and then the size of the fiber core of the optical fiber is continuously increased along with the change of the length. Therefore, the effective sectional area of the optical fiber is increased along with the increase of the length of the optical fiber, so that the threshold value of the nonlinear effect is improved, and the harmful nonlinear effect in the optical fiber laser system can be effectively inhibited. Referring to fig. 4 of the drawings, fig. 4 shows the raman signal intensity comparison between the gain fiber with 20 μm core diameter (fig. 4 (a)) and the long tapered gain fiber with core diameter gradually increasing from 20 μm to 45 μm (fig. 4 (b)) calculated theoretically. As can be seen from fig. 4, the long tapered fiber has a raman intensity much lower than the conventional 20 μm core diameter. Meanwhile, the tapered optical fiber is arranged along the positive directionThe core diameter is gradually increased, so for backward returning light, the core diameter is gradually reduced, and the loss of the backward returning light caused by the reduction of the core diameter can not only effectively prevent the damage of harmful feedback to the fiber laser system, but also inhibit the stimulated Brillouin scattering from the angle of inhibiting the backward light to a certain extent. On the other hand, according to Theoretical analysis (see Shi Cheng, et al, thermal study of mode evaluation in active long multimode fiber. Optics Express,2016.24 (17): p.19473-19490), the tapered fiber itself has the characteristic of maintaining the quality of the injected laser beam. Referring to the attached drawing 5 of the specification, fig. 5 shows the simulation results of the quality evolution of the long tapered fiber beam and the output light spot, and the quality of the output light beam is basically consistent with that of the input light beam, that is, the long tapered fiber does not cause the serious degradation of the beam quality in the process of gradually increasing the diameter of the fiber core, so that the original excellent beam quality of the laser system can be maintained.
The quartz block is positioned on the laser output end face outside the end cap shell and is plated with an antireflection film. The antireflection film can effectively reduce the loss of laser power, reduce backward light feedback and protect an optical fiber laser system from being damaged.
In the invention, one end of the quartz block, which is welded with the tapered optical fiber, is in a cone frustum shape, namely, the two ends of the quartz block are in a cone shape with circular end faces. One end of the quartz block extending out of the end cap shell is cylindrical. The cone frustum-shaped structure positioned in the end cap shell can prevent reverse return light from being coupled into the tail fiber, possible feedback of the reverse return light is reduced, and the safety and the working stability of the optical fiber laser are effectively improved.
Furthermore, the invention can arrange a cooling cavity and a cooling medium circulation channel inside the end cap shell to deal with the application scene of high-power laser. The inlet and outlet of the cooling medium are communicated with the cooling cavity, and the circulation of the cooling medium can be realized through external circulating equipment, so that the cooling effect of the end cap is improved.
The invention can achieve the following technical effects:
(1) The tapered optical fiber is used as the tail fiber of the end cap, so that the nonlinear effect (such as SRS and SBS) possibly existing in a high-power optical fiber laser system and harmful backward return light can be effectively inhibited while the protective effect is provided for the optical fiber output end face of the optical fiber laser system;
(2) The optical fiber laser system can keep good beam quality while protecting the optical fiber output end face of the optical fiber laser system, and is particularly suitable for power transmission of single-mode high-beam-quality laser;
(3) The shell structure of the optical fiber end cap can be designed to meet various application scenes, such as a high-power optical fiber laser and the like.
Drawings
FIG. 1 is a schematic diagram of a high power optical fiber end cap structure based on a single cladding tapered optical fiber
FIG. 2 is a schematic diagram of a double-clad tapered fiber structure
FIG. 3 is a schematic view of a single-clad tapered optical fiber
FIG. 4 is a graph of laser output Raman power versus pump shape for different pumping configurations without and with the present invention; where FIG. 4 (a) is a graph of laser output Raman power at different pumping formats without the use of the present invention; wherein FIG. 4 (b) is a graph of the Raman power output of the laser under different pumping regimes when employing the present invention
FIG. 5 is a graph of the calculated beam quality maintained for a tapered fiber provided by the present invention; wherein FIG. 5 (a) is a graph of the power variation of the fundamental and higher-order modes in a tapered fiber; FIG. 5 (b) shows the beam quality M of a tapered fiber 2 A change curve; FIGS. 5 (c) and (d) are diagrams of input and output spot shapes of tapered fibers, respectively.
FIG. 6 is a schematic diagram of a high power optical fiber end cap structure based on a double-clad tapered fiber.
In the figure: 1. a single-clad tapered fiber; 2. an end cap housing; 3. a quartz block; 4. an anti-reflection film; 5. an output end cap protection window; 6. a double-clad tapered optical fiber; 7. removing the optical fiber of the coating layer; 8. ultraviolet curing glue; 9. a coolant input interface; 10. a coolant output interface; 11. a cavity; 2-1, a fiber core; 2-2, inner cladding; 2-3, an outer cladding; 2-4, coating layer;
the implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The tapered optical fiber provided by the invention means that the diameter of the fiber core of the optical fiber is gradually increased along with the change of the length of the optical fiber, and can be a rare earth particle doped gain optical fiber and a common undoped energy transmission optical fiber. The two ends of the tapered fiber can be divided into a large end and a small end according to the diameter of the fiber core. See fig. 2 and 3. Fig. 2 shows a schematic diagram of a double-clad tapered optical fiber, which is composed of a fiber core 2-1, an inner cladding 2-2, an outer cladding 2-3 and a coating 2-4, wherein the outer surface of the fiber core 2-1 is sequentially provided with the inner cladding 2-2, the outer cladding 2-3 and the coating 2-4, the diameters of the fiber core 2-1 and the inner cladding 2-2 are linearly increased along with the increase of the length of the optical fiber, and the thicknesses of the outer cladding 2-3 and the coating 2-4 are fixed and do not change along with the length of the optical fiber. In FIG. 3, a single-clad tapered fiber is shown, consisting of a core 2-1, an inner cladding 2-2, and a coating 2-4; the outer surface of the fiber core 2-1 is sequentially provided with an inner cladding 2-2 and a coating layer 2-4, the diameters of the fiber core 2-1 and the inner cladding 2-2 are linearly increased along with the increase of the length of the optical fiber, and the thickness of the coating layer 2-4 is fixed and does not change along with the length of the optical fiber. Tapered fibers differ from conventional fibers in that the inner cladding and core geometries become increasingly large as the length of the fiber increases, and typically this core diameter change is achieved by varying the draw speed during fiber fabrication. The ports with larger and smaller core diameters in the tapered fiber are referred to as the large end and the small end, respectively. The typical size of the diameter of the small-end fiber core of the double-cladding tapered fiber is 10-50 mu m, and the typical size of the diameter of the large-end fiber core is 50-200 mu m. The typical size of the small-end core diameter of the single-cladding tapered fiber is 6-10 mu m, and the typical size of the large-end core diameter is 20-50 mu m.
Example 1: referring to fig. 1, a high-power optical fiber end cap based on a single-clad tapered optical fiber comprises a single-clad tapered optical fiber 1, a quartz block 3 and an end cap shell 2, wherein a large end of the single-clad tapered optical fiber 1 penetrates into the end cap shell 2 from one end of the end cap shell 2 and is fixed on the end cap shell 2, a cavity for the quartz block 3 to extend into is formed at the other end of the end cap shell 2, one end of the quartz block 3 extending into the end cap shell is a cone frustum-shaped end, one end of the quartz block 3 extending out of the end cap shell 2 is cylindrical, and an antireflection film 4 is plated on the cylindrical end face of the quartz block 3 extending out of the end cap shell 2; inside end cap shell 2, the butt fusion is held with the big end of toper optic fibre 1 to the circular truncated cone shape end of quartz block 3, is provided with output end cap protection window 5 on the end cap shell 2 of the one end that quartz block 3 stretches out outside end cap shell 2, and output end cap protection window 5 stretches out the cylinder end of quartz block outside the end cap shell inside it, prevents that the output terminal surface from polluting.
Fig. 4 is a comparison of the raman power output of a laser at different pumping regimes when not and when using the present invention. Wherein FIG. 4 (a) shows the Raman power of the laser without the present invention, the core diameter of the gain fiber in FIG. 4 (a) is 20 μm, the length thereof is 11m, and the Raman power is greater than 110W when pumping in the forward direction; FIG. 4 (b) shows that the output Raman power of the laser is below 2.3W after the long tapered gain fiber provided by the invention, the size of the fiber core of which is gradually changed from 20 μm to 45 μm, and the length of which is 11m, is adopted. Comparing fig. 4 (a) and fig. 4 (b), it can be known that the nonlinear effect of the laser can be greatly reduced by adopting the technical scheme provided by the present invention.
FIG. 5 is a calculation of the beam quality maintained by the tapered fiber provided by the present invention. Wherein FIG. 5 (a) is a graph of the power variation of the fundamental and higher-order modes in a tapered fiber; FIG. 5 (b) Cone fiber Beam quality M 2 A variation curve; FIGS. 5 (c), (d) show the tapered fiber input and output spot configurations, respectively. The results show that better beam quality and spot morphology at the input can be maintained when using tapered fibers.
Example 2: referring to fig. 6, a schematic diagram of a high power optical fiber end cap based on a double-clad tapered optical fiber. For the double-clad tapered fiber 6, one end of the double-clad tapered fiber 6 extending into the end cap housing 2 needs to be removed from its coating layer 2-4 before extending into the end cap housing 2, i.e. the double-clad tapered fiber 6 extending into the end cap housing 2 is a section of fiber 7 with the coating layer removed. And coating and curing the surface of the optical fiber 7 with the coating removed by using ultraviolet curing glue 8 to form a cladding light stripper.
A flowing coolant is provided inside the end cap housing 2 to assist in heat dissipation. In this embodiment, the end cap housing 2 has a cavity 11 therein. The large end of the processed double-clad tapered optical fiber 6 is inserted into the inner cavity of the end cap housing 2 from one end of the end cap housing 2 and fixed to the end cap housing 2. The other end of the end cap shell 2 is provided with a cavity for the quartz block 3 to extend into, one end of the quartz block 3 extending into the end cap shell is a cone-frustum-shaped end, one end of the quartz block 3 extending out of the end cap shell 2 is cylindrical, and an antireflection film 4 is plated on the end face of the cylindrical end of the quartz block 3 extending out of the end cap shell 2; in the cavity 11 of the inner part of the end cap shell 2, the truncated cone-shaped end of the quartz block 3 is welded with the large end of the tapered optical fiber 1, an output end cap protection window 5 is arranged on the end cap shell 2 at one end of the quartz block 3 extending out of the end cap shell 2, and the cylindrical end of the quartz block extending out of the end cap shell is sealed inside the output end cap protection window 5 to prevent the pollution of the output end face. A cooling liquid input interface 9 and a cooling liquid output interface 10 are arranged on the side wall of the end cap shell 2, cooling liquid enters the cavity 11 in the end cap shell 2 from the cooling liquid input interface 9 and flows out from the cooling liquid output interface 10, and flowing cooling liquid is formed in the cavity 11 in the end cap shell 2.
In the use process, cooling water can enter and exit from the cooling liquid input interface and the cooling liquid output interface on the end cap shell 2 through the external circulating water cooling machine, so that circulating refrigeration is realized to achieve a good refrigeration effect. And removing the coating layer from one section of the long-tapered double-cladding energy transmission optical fiber in the cooling cavity, and coating ultraviolet curing glue on the coating layer. The refractive index of the ultraviolet curing glue can be matched with that of the inner cladding material of the double-clad optical fiber, so that pump light which is not completely absorbed in the inner cladding of the optical fiber and high-order mode signal light can be stripped. The cooling cavity is filled with a cooling medium, and the cooling medium can transfer the light stripped from the ultraviolet curing glue into heat to absorb and carry away the heat.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (9)
1. A high-power optical fiber end cap based on a tapered optical fiber is characterized by comprising the tapered optical fiber, a quartz block and an end cap shell; the large end of the tapered optical fiber penetrates into the end cap shell from one end of the end cap shell and is fixed on the end cap shell, the other end of the end cap shell is provided with a cavity for a quartz block to extend into, one end of the quartz block extending into the end cap shell is a cone frustum-shaped end, one end of the quartz block extending out of the end cap shell is cylindrical, and an antireflection film is plated on the end face of the cylindrical end of the quartz block extending out of the end cap shell; in the end cap shell, the cone frustum-shaped end of the quartz block is welded with the large end of the tapered optical fiber, an output end cap protection window is arranged on the end cap shell at one end of the quartz block extending out of the end cap shell, and the cylindrical end of the quartz block extending out of the end cap shell is sealed inside the output end cap protection window; the diameter of the fiber core of the tapered optical fiber is gradually increased along with the change of the length of the optical fiber, and the two ends with larger and smaller diameters of the fiber core of the tapered optical fiber are respectively a large end and a small end.
2. The tapered fiber-based high power optical fiber end cap of claim 1, wherein the tapered fiber is a rare earth particle doped gain fiber or an undoped energy transfer fiber.
3. The tapered fiber-based high power optical fiber end cap according to claim 2, wherein the tapered fiber is a single-clad tapered fiber, or a double-clad tapered fiber, or a multi-clad tapered fiber with more than three claddings.
4. The high power tapered fiber-based optical end cap according to claim 3, wherein the diameter of the small-end core of the single-clad tapered fiber is 6 μm to 10 μm, and the diameter of the large-end core is 20 μm to 50 μm; the diameter of the small-end fiber core of the double-clad tapered optical fiber is 10-50 mu m, and the diameter of the large-end fiber core of the double-clad tapered optical fiber is 50-200 mu m.
5. The high-power optical fiber end cap based on the tapered optical fiber according to claim 3, wherein the single-clad tapered optical fiber consists of a fiber core, an inner cladding and a coating layer, the outer surface of the fiber core is sequentially provided with the inner cladding and the coating layer, the diameters of the fiber core and the inner cladding become larger linearly with the increase of the length of the optical fiber, and the thickness of the coating layer is fixed.
6. The high power optical fiber end cap based on tapered optical fiber according to claim 3, wherein the double-clad tapered optical fiber is composed of a core, an inner cladding, an outer cladding and a coating layer, the outer surface of the core is sequentially provided with the inner cladding, the outer cladding and the coating layer, the diameters of the core and the inner cladding become larger linearly with the increase of the length of the optical fiber, and the thicknesses of the outer cladding and the coating layer are fixed.
7. The tapered-fiber-based high-power optical fiber end cap according to claim 5, wherein for the double-clad tapered fiber, the coating of one end of the double-clad tapered fiber extending into the end cap housing needs to be removed before the end of the double-clad tapered fiber extends into the end cap housing, that is, the double-clad tapered fiber extending into the end cap housing is a section of fiber with the coating removed; coating and curing the surface of the optical fiber with the coating layer removed by using ultraviolet curing adhesive to form a cladding light stripper; and penetrating the large end of the processed double-clad tapered optical fiber into the inner cavity of the end cap shell from one end of the end cap shell and fixing the large end on the end cap shell.
8. The tapered fiber-based high power optical fiber end cap according to any one of claims 1 to 7, wherein a flowing cooling fluid is provided inside the end cap housing to aid in heat dissipation.
9. The high power optical fiber end cap based on tapered optical fiber according to claim 8, wherein the inside of the end cap housing is a cavity, the large end of the tapered optical fiber extends into the cavity inside the end cap housing from one end of the end cap housing, the truncated cone-shaped end of the quartz block extends into the cavity inside the end cap housing from the other end of the end cap housing, and the truncated cone-shaped end of the quartz block is welded with the large end of the tapered optical fiber in the cavity inside the end cap housing; and a cooling liquid input interface and a cooling liquid output interface are arranged on the side wall of the end cap shell, cooling liquid enters the cavity in the end cap shell from the cooling liquid input interface and flows out from the cooling liquid output interface, and flowing cooling liquid is formed in the end cap shell.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09286640A (en) * | 1996-04-23 | 1997-11-04 | Mitsubishi Cable Ind Ltd | Die for coating optical fiber with resin |
| JPH11271564A (en) * | 1998-03-20 | 1999-10-08 | Jiyu Denshi Laser Kenkyusho:Kk | Optical connector |
| CN103280688A (en) * | 2013-05-23 | 2013-09-04 | 纽敦光电科技（上海）有限公司 | End face protection structure of high-power laser optical fiber |
| CN103676051A (en) * | 2013-11-29 | 2014-03-26 | 深圳市创鑫激光技术有限公司 | Myriawatt-level high-power optical fiber end cap |
| CN103777271A (en) * | 2013-11-27 | 2014-05-07 | 清华大学 | Fiber, fiber oscillator and fiber amplifier |
| CN105490141A (en) * | 2016-01-22 | 2016-04-13 | 中国人民解放军国防科学技术大学 | Integrated high-power optical fiber laser output system with cladding light filtering function |
| CN207081848U (en) * | 2017-05-25 | 2018-03-09 | 中国人民解放军国防科学技术大学 | A kind of high-power fiber end cap based on conical fiber |
-
2017
- 2017-05-25 CN CN201710377180.9A patent/CN106959489B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09286640A (en) * | 1996-04-23 | 1997-11-04 | Mitsubishi Cable Ind Ltd | Die for coating optical fiber with resin |
| JPH11271564A (en) * | 1998-03-20 | 1999-10-08 | Jiyu Denshi Laser Kenkyusho:Kk | Optical connector |
| CN103280688A (en) * | 2013-05-23 | 2013-09-04 | 纽敦光电科技（上海）有限公司 | End face protection structure of high-power laser optical fiber |
| CN103777271A (en) * | 2013-11-27 | 2014-05-07 | 清华大学 | Fiber, fiber oscillator and fiber amplifier |
| CN103676051A (en) * | 2013-11-29 | 2014-03-26 | 深圳市创鑫激光技术有限公司 | Myriawatt-level high-power optical fiber end cap |
| CN105490141A (en) * | 2016-01-22 | 2016-04-13 | 中国人民解放军国防科学技术大学 | Integrated high-power optical fiber laser output system with cladding light filtering function |
| CN207081848U (en) * | 2017-05-25 | 2018-03-09 | 中国人民解放军国防科学技术大学 | A kind of high-power fiber end cap based on conical fiber |
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