CN111129921A - Fiber cladding light filter based on femtosecond ablation and use method thereof - Google Patents
Fiber cladding light filter based on femtosecond ablation and use method thereof Download PDFInfo
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- CN111129921A CN111129921A CN201910386938.4A CN201910386938A CN111129921A CN 111129921 A CN111129921 A CN 111129921A CN 201910386938 A CN201910386938 A CN 201910386938A CN 111129921 A CN111129921 A CN 111129921A
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- optical fiber
- capillary
- ablation
- cladding light
- quartz
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06704—Housings; Packages
Abstract
The invention discloses a femtosecond ablation-based optical fiber cladding light filter and a using method thereof, and aims to solve the problem that an existing cladding light filter causes optical fibers to generate heat. This product includes heat conduction casing, first capillary, second capillary and quartz capsule, first capillary and second capillary are fixed respectively at the both ends of quartz capsule, and the quartz capsule penetrates the inside of heat conduction casing and the quartz capsule is fixed with the heat conduction casing, and the inner wall of quartz capsule is provided with the texturing region. The product has reasonable design and simple and convenient use, can ensure that the surface of the optical fiber is not accumulated with heat, the filter area of the device is heated uniformly, more efficient cladding light filtering can be realized, and the use requirements of people are met.
Description
Technical Field
The invention relates to the field of laser, in particular to a fiber cladding light filter based on femtosecond ablation.
Background
The fiber laser has the advantages of high conversion efficiency, high energy density, good beam quality, compact structure, stable performance and the like, and is widely applied to the fields of industrial production, medical treatment, communication, national defense and military and the like. When the fiber laser works, the pump light input into the double-cladding gain fiber cannot be completely absorbed by a gain medium, the output end of the gain fiber inevitably contains residual pump light and signal light leaked due to welding eccentric error, fiber bending and other factors, and if the residual cladding light is continuously transmitted forwards, the quality of the light beam of the output laser is influenced, and other devices in the fiber laser are damaged; in the process of coupling and transmitting the high-power laser through the energy-transmitting optical fiber, part of focused light enters the cladding due to deviation from the central line direction of the optical fiber or due to the fact that the incident angle of part of light exceeds the numerical aperture angle, and the generated heat can cause the coating layer of the optical fiber to be heated, so that the energy-transmitting optical fiber is burnt; fiber lasers are particularly sensitive to reflected light from the work piece being machined, and the strong reflected light, once reflected back into the laser during cutting, welding and drilling of the laser, can cause the laser to burn out. Therefore, the cladding light filter with high stability and high stripping efficiency has important significance for improving the output power and stability of the fiber laser.
The existing cladding light filter is mainly realized by coating high-refractive-index glue outside a cladding and a method of corroding the surface of the cladding by chemical acid. The cladding light stripper prepared based on the coated high-refractive-index glue can stably work only under the cooling of a high-strength water-through heat sink, and the high-refractive-index glue has poor high-temperature tolerance and limits the power bearing capacity of the device. The stripper manufactured by the chemical corrosion method has the advantages that the process is difficult to control, and the filtered light is mainly gathered at the front end of the stripper, so that a large amount of light and heat are gathered at the front end of the device, the heat dissipation of the device is uneven, the local temperature is too high, the optical fiber is heated, the quality of the light beam is poor, and the optical fiber is burnt out when the heat is accumulated to a certain degree.
Disclosure of Invention
The invention aims to provide a fiber cladding light filter based on femtosecond ablation so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides an optic fibre covering optical filter ware based on femto second ablation, includes heat conduction casing, first capillary, second capillary and quartz capsule, first capillary and second capillary are fixed respectively at the both ends of quartz capsule, and the quartz capsule penetrates the inside of heat conduction casing and the quartz capsule is fixed with the heat conduction casing, and the inner wall of quartz capsule is provided with the texturing region.
As a further scheme of the invention: the quartz capsule adopts the pipe, and the length of quartz capsule is 60mm, and the internal diameter of quartz capsule is 5mm, and this kind of size can be applicable to most optic fibre, workable, and processing technology is mature, and the processing cost is low.
As a further scheme of the invention: the quartz tube is cleaned by 10% hydrofluoric acid for 10-20 minutes before use, so that the influence on light transmission is reduced.
As a further scheme of the invention: the length of the roughened region is 40mm, and the roughened region is located in the central region of the inner wall of the quartz tube.
As a further scheme of the invention: the first capillary and the second capillary are both sapphire capillaries and quartz capillaries, and the two capillaries can be directly purchased in the market and are convenient to replace.
As a further scheme of the invention: the heat conducting shell is made of metal materials, so that the heat conducting shell is low in cost, easy to process and good in heat conducting effect.
As a further scheme of the invention: first capillary and second capillary all adopt thermosetting glue to fix at the quartz capsule both ends, and the junction of quartz capsule and heat conduction casing adopts thermosetting glue solidification, and firm in connection nature is good, guarantees the stability of operation in the use.
The use method of the fiber cladding light filter based on femtosecond ablation comprises the following specific steps:
firstly, stripping a coating layer of an optical fiber, and cleaning the surface of the stripped optical fiber to obtain a processed optical fiber;
fixing the processed optical fiber in a femtosecond laser processing area, forming a smooth concave ablation array with the diameter of less than 30 microns and the depth of less than 5 microns on the optical fiber cladding by using the optical fiber cladding of the optical fiber subjected to femtosecond laser ablation processing to obtain the ablated optical fiber, wherein the concave ablation array is gradually and densely changed from sparse to gradual, and the ablation length is 40mm along the light transmission direction;
thirdly, penetrating the ablated optical fiber into the quartz tube, wherein the ablation array is positioned in the central area of the quartz tube, and the contact positions of the ablated optical fiber and the first capillary tube and the ablated optical fiber and the second capillary tube are cured by ultraviolet glue;
and fourthly, after the cladding light enters the ablation array of the optical fiber, because the original waveguide structure of the optical fiber is damaged, the light no longer meets the law of total reflection in the transmission process, the light is scattered to the inner wall of the quartz tube, secondary scattering is carried out through a roughened area on the inner wall of the quartz tube, the light stripped out of the cladding can be led out more uniformly and taken away by the heat-conducting shell, the first capillary tube and the second capillary tube are both tightly combined with the optical fiber coating layer, the light scattered to the optical fiber coating layer can be led out to the heat-conducting shell, and the optical fiber coating layer is prevented from being burnt by heat.
Compared with the prior art, the invention has the beneficial effects that:
the product has reasonable design and simple and convenient use, can ensure that the surface of the optical fiber is not accumulated with heat, the filter area of the device is heated uniformly, more efficient cladding light filtering can be realized, and the use requirements of people are met.
Drawings
FIG. 1 is a schematic structural diagram of a fiber cladding light filter based on femtosecond ablation.
FIG. 2 is a schematic diagram of a fiber structure after femtosecond ablation-based fiber cladding light filter processing.
Wherein: 1-optical fiber, 2-heat conducting shell, 3-first capillary, 4-second capillary, 5-quartz tube, 6-cladding light stripping area, 7-optical fiber cladding and 8-optical fiber core.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
Example 1
The utility model provides an optic fibre cladding light filter ware based on femto second ablation, includes heat conduction casing 2, first capillary 3, second capillary 4 and quartz capsule 5, first capillary 3 and second capillary 4 are fixed respectively at the both ends of quartz capsule 5 and the internal diameter of first capillary 3 and second capillary 4 all slightly is greater than the diameter of optic fibre coating, and quartz capsule 5 penetrates the inside of heat conduction casing 2 and quartz capsule 5 is fixed with heat conduction casing 2, and the inner wall of quartz capsule 5 is provided with the texturing region who adopts glass frosting powder preparation.
The quartz tube 5 adopts a round tube, the length of the quartz tube 5 is 60mm, the inner diameter of the quartz tube 5 is 5mm, the size can be suitable for most optical fibers, the processing is easy, the processing technology is mature, and the processing cost is low.
The quartz tube 5 is cleaned by 10% hydrofluoric acid for 10-20 minutes before use, so that the influence on light transmission is reduced.
The first capillary 3 and the second capillary 4 are both sapphire capillaries, and the capillaries can be directly purchased in the market and are convenient to replace.
The use method of the fiber cladding light filter based on femtosecond ablation comprises the following specific steps:
firstly, stripping a coating layer of an optical fiber 1, and cleaning the surface of the stripped optical fiber 1 to obtain a processed optical fiber 1;
fixing the processed optical fiber 1 in a femtosecond laser processing area, forming a smooth concave ablation array with the diameter of less than 30 microns and the depth of less than 5 microns on the optical fiber cladding 7 by using the optical fiber cladding 7 of the optical fiber subjected to femtosecond laser ablation processing to obtain the ablated optical fiber 1, wherein the concave ablation array is gradually and densely concentrated from sparse to gradual along the light transmission direction, and the ablation length is 40 mm;
step three, cleaning the quartz tube 5 for 15 minutes by adopting hydrofluoric acid with the mass fraction of 10%, penetrating the ablated optical fiber 1 into the quartz tube 5, positioning the ablation array in the central area of the quartz tube 5, and curing the contact positions of the ablated optical fiber 1 and the first capillary 3 and the ablated optical fiber 1 and the second capillary 4 by adopting ultraviolet glue;
and step four, after the cladding light enters the ablation array of the optical fiber 1, because the original waveguide structure of the optical fiber 1 is damaged, the light no longer meets the law of total reflection in the transmission process, the light is scattered to the inner wall of the quartz tube 5, secondary scattering is carried out through the roughened area of the inner wall of the quartz tube 5, the light stripped out of the cladding can be led out more uniformly and taken away by the heat-conducting shell 2, the first capillary tube 3 and the second capillary tube 4 are both tightly combined with the coating layer of the optical fiber 1, the light scattered to the coating layer of the optical fiber 1 can be led out to the heat-conducting shell 2, the coating layer of the optical fiber 1 is prevented from being burnt by heat, and the optical fiber core 8 and the cladding light stripping area 6 which meet the.
Example 2
The utility model provides an optical fiber cladding light filter ware based on femto second ablation, includes heat conduction casing 2, first capillary 3, second capillary 4 and quartz capsule 5, first capillary 3 and second capillary 4 are fixed respectively at the both ends of quartz capsule 5, and quartz capsule 5 penetrates the inside of heat conduction casing 2 and quartz capsule 5 is fixed with heat conduction casing 2, and the inner wall of quartz capsule 5 is provided with the texturing region.
The length of the roughened region was 40mm, and the roughened region was located in the central region of the inner wall of the quartz tube 5.
The first capillary 3 adopts sapphire capillary, and the second capillary 4 adopts quartz capillary, and these two kinds of capillary markets can directly purchase, are convenient for change.
The heat conducting shell 2 is made of metal materials, and is low in cost, easy to process and good in heat conducting effect.
First capillary 3 and second capillary 4 all adopt thermosetting glue to fix at quartz capsule 5 both ends, and the junction of quartz capsule 5 and heat conduction casing 2 adopts thermosetting glue solidification, and firm in connection nature is good, guarantees the stability of operation in the use.
The use method of the fiber cladding light filter based on femtosecond ablation comprises the following specific steps:
firstly, stripping a coating layer of an optical fiber 1, and cleaning the surface of the stripped optical fiber 1 to obtain a processed optical fiber 1;
fixing the processed optical fiber 1 in a femtosecond laser processing area, forming a smooth concave ablation array with the diameter less than 30 microns and the depth less than 5 microns on the optical fiber cladding 7 by using the optical fiber cladding 7 of the optical fiber 1 ablated by the femtosecond laser, and obtaining the ablated optical fiber 1, wherein the concave ablation array is gradually and densely concentrated from sparse to gradual along the light transmission direction, and the ablation length is 40 mm;
thirdly, penetrating the ablated optical fiber 1 into a quartz tube 5, wherein an ablation array is positioned in the central area of the quartz tube 5, and ultraviolet glue is adopted for curing the contact positions of the ablated optical fiber 1 and the first capillary tube 3 and the ablated optical fiber 1 and the second capillary tube 4;
and step four, after the cladding light enters the ablation array of the optical fiber 1, because the original waveguide structure of the optical fiber 1 is damaged, the light no longer meets the law of total reflection in the transmission process, the light is scattered to the inner wall of the quartz tube 5, secondary scattering is carried out through a roughened area of the inner wall of the quartz tube 5, the light stripped out of the cladding can be led out more uniformly and taken away by the heat-conducting shell 2, the first capillary tube 3 and the second capillary tube 4 are both tightly combined with the coating layer of the optical fiber 1, the light scattered to the coating layer of the optical fiber 1 can be led out to the heat-conducting shell 2, and the coating layer of the optical fiber 1 is prevented from being burnt out by heat.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. The utility model provides an optic fibre cladding light filter ware based on femto second ablation, includes heat conduction casing (2), first capillary (3), second capillary (4) and quartz capsule (5), first capillary (3) and second capillary (4) are fixed respectively at the both ends of quartz capsule (5), and quartz capsule (5) penetrate the inside of heat conduction casing (2) and quartz capsule (5) are fixed with heat conduction casing (2), its characterized in that, the inner wall of quartz capsule (5) is provided with the texturing zone.
2. The femtosecond ablation-based optical fiber cladding light filter according to claim 1, wherein the quartz tube (5) is a circular tube.
3. The femtosecond ablation-based optical fiber cladding light filter according to claim 1, wherein the quartz tube (5) is cleaned with 10% by mass hydrofluoric acid for 10-20 minutes before use.
4. The femtosecond ablation-based optical fiber cladding light filter according to claim 1 or 3, wherein the length of the roughened region is 40mm, and the roughened region is located in the central region of the inner wall of the quartz tube (5).
5. The femtosecond ablation-based fiber cladding light filter according to claim 1, wherein the first capillary (3) and the second capillary (4) are both made of any one of sapphire capillary and quartz capillary.
6. The femtosecond ablation-based fiber cladding light filter according to claim 1 or 5, characterized in that the heat-conducting shell (2) is made of a metal material.
7. The femtosecond ablation-based optical fiber cladding light filter according to claim 1, wherein the first capillary (3) and the second capillary (4) are fixed at two ends of the quartz tube (5) by using thermosetting glue, and the joint of the quartz tube (5) and the heat-conducting shell (2) is cured by using thermosetting glue.
8. A method for using the femtosecond ablation-based optical fiber cladding light filter according to any one of claims 1 to 7, which is characterized by comprising the following specific steps:
step one, stripping a coating layer of an optical fiber (1), and cleaning the surface of the stripped optical fiber (1) to obtain a processed optical fiber (1);
fixing the processed optical fiber (1) in a femtosecond laser processing area, and forming an ablation array on an optical fiber cladding (7) by using the optical fiber cladding (7) of the optical fiber (1) ablated by the femtosecond laser to obtain the ablated optical fiber (1);
thirdly, penetrating the ablated optical fiber (1) into a quartz tube (5), wherein an ablation array is positioned in the central area of the quartz tube (5), and ultraviolet glue is adopted to cure the contact positions of the ablated optical fiber (1) and the first capillary tube (3) and the ablated optical fiber (1) and the second capillary tube (4);
and step four, enabling the cladding light to enter the ablation array of the optical fiber (1), scattering the cladding light to the inner wall of the quartz tube (5), and performing secondary scattering through a roughened area of the inner wall of the quartz tube (5).
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Cited By (2)
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| CN113681151A (en) * | 2021-08-31 | 2021-11-23 | 山东师范大学 | Method for processing optical fiber end face based on femtosecond laser |
| CN114204389A (en) * | 2021-11-24 | 2022-03-18 | 四川橙科通信技术研究院有限责任公司 | Fiber grating string structure and preparation method thereof |
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