CN216312319U - Optical fiber cladding light stripper - Google Patents
Optical fiber cladding light stripper Download PDFInfo
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- CN216312319U CN216312319U CN202122926073.1U CN202122926073U CN216312319U CN 216312319 U CN216312319 U CN 216312319U CN 202122926073 U CN202122926073 U CN 202122926073U CN 216312319 U CN216312319 U CN 216312319U
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Abstract
The utility model discloses an optical fiber cladding light stripper, which comprises a double-cladding optical fiber, wherein a coating layer and an outer cladding layer of a preset section of the double-cladding optical fiber are stripped and expose an inner cladding layer, and the surface of the inner cladding layer of the preset section is sequentially plated with an energy extraction layer and an energy absorption layer from inside to outside; the utility model is based on the principle of light interference, controls the transmissivity of cladding light at the interface of an inner cladding and a film stack in the form of an optical film, and further extracts and redistributes the cladding light energy.
Description
Technical Field
The utility model is applied to the field of optical fiber laser devices, and particularly relates to an optical fiber cladding light stripper.
Background
With the development of semiconductor lasers, high-power fiber lasers are widely applied to the fields of industry, medical treatment, military and the like because of the advantages of good beam quality, high conversion efficiency, compact structure and the like. The double-clad optical fiber can effectively improve the output power of the optical fiber laser and mainly comprises a fiber core, an inner cladding, an outer cladding and a coating layer. The refractive index of the fiber core is higher than that of the inner cladding, and the refractive index of the inner cladding is higher than that of the outer cladding. The pump light is transmitted in the inner cladding layer, and total reflection occurs at the interface of the inner cladding layer and the outer cladding layer. The fiber core is doped with gain rare earth elements, when the pump light of the inner cladding is coupled into the fiber core, the rare earth elements of the fiber core can generate stimulated radiation laser, the laser is used as signal light and only propagates in the fiber core, and total reflection occurs at the interface of the fiber core and the inner cladding.
Cladding pump light plays an important role in double-clad optical fibers, but compared with signal light, cladding light is useless light and needs to be stripped in time after the pumping function is achieved. With the continuous increase of the cladding light power, if the cladding light is not timely and effectively stripped, the cladding light can not only interfere with the output signal light, but also cause the optical fiber to generate heat in serious cases, so that the optical fiber laser faces the danger of burning. Therefore, it is important to develop a fiber cladding light stripper with high efficiency, safety and simple structure.
Patent CN205333909U proposes to coat the inner cladding of the optical fiber with one or more films with refractive index higher than that of the inner cladding to break the total reflection condition, thereby refracting the cladding out of the inner cladding. The manufacturing mode of the stripper in the patent is similar to that of the utility model and is a coating, but the coating in the patent is only a simple single-layer coating or a simple stack of multiple coatings with sequentially increased refractive indexes, and cannot realize the control of the light energy of the cladding.
Patent CN210517314U proposes to strip the cladding light by using several strippers simultaneously, each stripper strips a part of the cladding light to avoid the sharp temperature rise of the front section of the stripper. The idea of the patent for stripping the cladding light in sections is similar to the second and third embodiments of the utility model, but the stripper used in the patent is a high-refraction glue-coated cladding stripper, and the stripping principle is different from the utility model. The method of coating the high refractive index material outside the inner cladding has drawbacks: the commonly used high refractive index material is usually glue, and due to poor heat resistance of the glue, when the cladding light is transmitted to the glue in a large amount in the initial stage, local high temperature is caused, which causes non-uniform temperature of the stripper, degradation of the optical fiber characteristics, and even burning of the optical fiber in severe cases.
Patent CN212366412U also proposes a method of cascading multiple cladding light strippers to derive the cladding light in stages, but the type of stripper in this patent is an etching type stripper, which is different from the principle and manufacturing method of the present invention. The method for destroying the surface flatness of the inner cladding by utilizing chemical corrosion or laser etching has higher process difficulty and difficult control of production cost and yield, so the method has certain limitation on production.
In short, the existing patents either coat the high refractive index material outside the inner cladding to destroy the total reflection condition and refract the cladding light out of the inner cladding, or use chemical corrosion or laser etching to destroy the surface flatness of the inner cladding and scatter the cladding light out of the inner cladding.
Disclosure of Invention
The utility model aims to solve the technical problem of the prior art and provides an optical fiber cladding light stripper.
In order to solve the technical problem, the optical fiber cladding light stripper comprises a double-cladding optical fiber, wherein a coating layer and an outer cladding layer of a preset section of the double-cladding optical fiber are stripped and expose the inner cladding layer, and an energy extraction layer and an energy absorption layer are sequentially plated on the surface of the inner cladding layer of the preset section from inside to outside;
the cladding light entering the inner cladding keeps a part of the cladding light reflected back to the inner cladding through the energy extraction layer to continue to be transmitted in the transmission process, and the other part of the cladding light is transmitted to the energy absorption layer through the energy extraction layer to be absorbed and stripped.
As a possible embodiment, further, the energy extraction layer is a high-reflection film.
As a possible embodiment, further, the energy extraction layer is composed of a high-reflection film and a light splitting film which are connected end to end in a segmented manner.
As a possible embodiment, further, the high-reflectivity film and the light splitting film in the energy extraction layer are sequentially arranged along the incident direction of the cladding light.
As a possible embodiment, further, the number of the light splitting films is two or more.
As a possible embodiment, further, the high-reflection film and the light-splitting film are each composed of a plurality of single-layer films.
As a possible implementation mode, further, the end of the energy absorption layer is thickened and wrapped at the end of the energy extraction layer.
As a possible embodiment, further, the single-layer film includes at least Ta2O5、HfO2、TiO2、ZrO2、Al2O3One kind of (1).
As a possible embodiment, further, the energy absorbing layer consists of a single layer or multiple layers of absorbing material.
As a possible implementation, further, the absorption material includes at least one of amorphous silicon, carbon, indium, tin, aluminum, and gold.
A method for manufacturing an optical fiber cladding light stripper comprises the following steps:
stripping the coating layer and the outer cladding layer of the preset section of the double-clad optical fiber by chemical corrosion or mechanical stripping, exposing the inner cladding layer of the section of the optical fiber and cleaning;
exposing the cleaned optical fiber outside, and performing energy extraction layer coating operation;
after all the film layers of the energy extraction layer are plated, exposing the energy extraction layer outside, and performing film plating operation on the energy absorption layer outside the energy extraction layer;
wherein the coating operation of the energy extraction layer and the energy absorption layer at least comprises one of electron beam evaporation, ion beam assisted deposition and magnetron sputtering.
By adopting the technical scheme, the utility model has the following beneficial effects: the utility model is based on the principle of light interference, controls the transmissivity of cladding light at the interface of an inner cladding and a film stack in the form of an optical film, and further extracts and redistributes the cladding light energy. In order to solve the problem of serious temperature rise when the stripper uses glue, the utility model can realize the extraction and redistribution of the cladding light energy by utilizing the film layers with different structures, and avoid the cladding light from being led out in a large amount locally, thereby ensuring that the heat is more uniformly dispersed. Meanwhile, in order to avoid the method with high process difficulty of chemical corrosion or laser etching, the utility model adopts a film coating mode to manufacture the cladding light stripper. The preparation technology of the optical film is mature at the present stage, is more environment-friendly compared with a chemical corrosion method, has a simpler production flow compared with a laser etching method, and can reduce the production difficulty.
Drawings
The utility model is described in further detail below with reference to the following figures and embodiments:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of embodiment 1 of the present invention;
FIG. 3 is a schematic diagram of the structure of the high-reflectivity film system and the light reflectivity of the cladding layer in example 1 of the present invention;
FIG. 4 is a schematic structural view of embodiment 2 of the present invention;
FIG. 5 is a schematic diagram of the structure of the high-reflectivity film system and the light reflectivity of the cladding layer in example 2 of the present invention;
FIG. 6 is a schematic diagram of the film structure and cladding light reflectivity of the spectroscopic film 1 according to example 2 of the present invention;
FIG. 7 is a schematic diagram of the structure of the spectroscopic film 2 and the light reflectivity of the cladding layer in example 2 of the present invention;
FIG. 8 is a schematic structural view of example 3 of the present invention;
FIG. 9 is a schematic diagram of the high reflectivity structure and cladding light reflectivity of example 3 of the present invention;
FIG. 10 is a schematic diagram of the film structure and cladding light reflectivity of the spectroscopic film 1 according to example 3 of the present invention;
FIG. 11 is a schematic diagram of the structure of the spectroscopic film 2 and the light reflectivity of the cladding layer according to example 3 of the present invention;
FIG. 12 is a schematic diagram of the structure of the light splitting film 3 and the light reflectivity of the cladding layer according to example 3 of the present invention;
FIG. 13 is a schematic diagram of the structure of the spectroscopic film 4 and the light reflectivity of the cladding layer according to example 3 of the present invention;
fig. 14 is a schematic structural diagram of embodiment 4 of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described in detail and completely with reference to the accompanying drawings.
As shown in fig. 1, in the present invention, the energy extraction layer 200 is a high-reflection film 201 or a combination of the high-reflection film 201 and a spectroscopic film 202. When the cladding light is transmitted to the high reflection film covering section, a large amount of cladding light is reflected back to the inner cladding of the optical fiber, and only a small part of the cladding light can be transmitted to the energy absorption layer to be absorbed. With the transmission of light, the cladding light can be reflected for multiple times at the interface of the inner cladding, and the energy is uniformly guided out, so that the severe temperature rise cannot be caused. If the uniformity of the cladding light stripping is further improved, a sectional coating mode can be used: the front section is plated with a high reflection film, and the rear section is plated with a light splitting film. The total energy of the cladding light gradually decreases as the cladding light is reflected and partially absorbed multiple times at the high-reflection film covered section. When the light is transmitted to the light splitting film covering section, the transmittance of the cladding light is improved, and the residual cladding light can be guided out to the energy absorption layer and absorbed as completely as possible.
Example 1
As shown in FIG. 2, in which 101-core 102-inner cladding 103-outer cladding 104-coating 200-energy extraction layer 201-high reflection film 300-energy absorption layer, the present invention provides a method for manufacturing a fiber coreThe optical fiber cladding light stripper comprises a double-clad optical fiber, wherein a coating layer 104 and an outer cladding layer 103 of a preset section of the double-clad optical fiber are stripped and expose an inner cladding layer 102 containing a fiber core 101, and the surface of the inner cladding layer 102 of the preset section is sequentially plated with an energy extraction layer 200 and an energy absorption layer 300 from inside to outside; the cladding light entering the inner cladding 102 keeps a part of the cladding light reflected back to the inner cladding 102 through the energy extraction layer 200 to continue to be transmitted during the transmission process, and another part of the cladding light is transmitted to the energy absorption layer 300 through the energy extraction layer 200 to be absorbed and stripped. The energy extraction layer 200 is a highly reflective film 201. The high-reflection film 201 is composed of a plurality of single-layer films. The energy absorbing layer 300 is comprised of a single layer or multiple layers of absorbing material. The optical fiber used in this example had an inner cladding diameter of 250 μm, NA>0.46, pump light wavelength 976 nm. The energy extraction layer is a single-section high-reflection film with the length of 6 cm. The single-layer film used is HfO2And SiO2. The energy absorption layer is made of metal aluminum. The high-reflection film 201 is composed of 5 single-layer films, and has a reflection rate of about 90% for pumping light. FIG. 3 shows the reflectivity of the film system structure and the cladding light at incidence angles of 72 °, 80 °, and 85 °, and it can be seen that the film system can ensure that the reflectivity of 976nm cladding light at different transmission angles is about 90%.
Example 2
As shown in fig. 4, wherein 101-the core 102-the inner cladding 103-the outer cladding 104-the coating layer 200-the energy extraction layer 201-the high reflective film 202-the beam splitting film 1203-the beam splitting film 2300-the energy absorption layer;
an optical fiber cladding light stripper comprises a double-clad optical fiber, wherein a coating layer 104 and an outer cladding layer 103 of a preset section of the double-clad optical fiber are stripped and expose an inner cladding layer 102 containing a fiber core 101, and the surface of the inner cladding layer 102 of the preset section is sequentially plated with an energy extraction layer 200 and an energy absorption layer 300 from inside to outside; the cladding light entering the inner cladding 102 keeps a part of the cladding light reflected back to the inner cladding 102 through the energy extraction layer 200 to continue to be transmitted during the transmission process, and another part of the cladding light is transmitted to the energy absorption layer 300 through the energy extraction layer 200 to be absorbed and stripped. The energy extraction layer 200 is composed of a high-reflection film 201 and light splitting films 202 and 203 which are connected end to end in a segmented mode. The highly reflective film 201 and the spectroscopic films 202 and 203 in the energy extraction layer 200 are arranged in this order along the incident direction of the cladding light. The number of the light splitting films is more than or equal to two. The high-reflection film 201 and the light splitting films 202 and 203 are both composed of multiple single-layer films.
On the basis of the first embodiment, in order to improve the uniformity of the cladding light stripping, the energy extraction layer of the first embodiment is divided into three segments, and each segment is 2cm in length. The first section of the energy extraction layer is a high-reflection film, the second section of the energy extraction layer is a light splitting film, and the reflectivity of cladding light is reduced in sequence. The high-refractive-index material used for the high-reflection film and the light splitting film is TiO2, and the low-refractive-index material is SiO 2. The material used for the energy absorbing layer is carbon.
The high-reflection film is composed of 11 single-layer films, the reflectivity of the high-reflection film to pump light is about 90%, and fig. 5 shows the reflectivity of the film system structure and the reflectivity of the cladding light at incidence angles of 72 degrees, 80 degrees and 85 degrees, so that the film system can ensure that the reflectivity of 976nm cladding light at different transmission angles is about 90%.
The light splitting film 1 is composed of 5 single-layer film layers, the reflectivity of the light splitting film to pump light is about 70%, and fig. 6 shows the reflectivity of the pump light under the structure of a film system and different angles.
The light splitting film 2 is composed of 3 single-layer films, and the reflectivity of the light splitting film to pump light is about 50%. FIG. 7 shows the reflectivity of the pump light at different angles and the film structure. The embodiment strips the cladding light into three segments, and compared with the embodiment that the cladding light is stripped uniformly in the first segment.
Example 3
As shown in fig. 8, 101-the core 102-the inner cladding 103-the outer cladding 104-the coating 200-the energy extraction layer 201-the high reflective film 202-the splitting film 1203-the splitting film 2204-the splitting film 3205-the splitting film 4300-the energy absorption layer;
an optical fiber cladding light stripper comprises a double-clad optical fiber, wherein a coating layer 104 and an outer cladding layer 103 of a preset section of the double-clad optical fiber are stripped and expose an inner cladding layer 102 containing a fiber core 101, and the surface of the inner cladding layer 102 of the preset section is sequentially plated with an energy extraction layer 200 and an energy absorption layer 300 from inside to outside; the cladding light entering the inner cladding 102 keeps a part of the cladding light reflected back to the inner cladding 102 through the energy extraction layer 200 to continue to be transmitted during the transmission process, and another part of the cladding light is transmitted to the energy absorption layer 300 through the energy extraction layer 200 to be absorbed and stripped. The energy extraction layer 200 is composed of a high-reflection film 201 and light splitting films 202, 203, 204 and 205 which are connected end to end in a segmented mode. The highly reflective film 201 and the spectroscopic films 202, 203, 204, 205 in the energy extraction layer 200 are arranged in this order along the incident direction of the cladding light. The number of the light splitting films is more than or equal to two. The high-reflection film 201 and the light splitting films 202, 203, 204 and 205 are composed of a plurality of single-layer films. The energy absorbing layer 300 is comprised of a single layer or multiple layers of absorbing material.
On the basis of the first embodiment and the second embodiment, in order to further improve the uniformity of the cladding light stripping, the energy extraction layer is divided into five sections, and the length of each section is 1 cm. The first section of the energy extraction layer is a high-reflection film, the last four sections are light splitting films, and the reflectivity of cladding light is reduced in sequence. The high-refractive-index material used for the high-reflection film and the light splitting film is Ta2O5The low refractive index material is SiO2. The material used for the energy absorbing layer is alpha-Si.
Wherein, the high reflective film is composed of 7 single-layer films, the reflectivity to the pump light is about 90%, and fig. 9 is the reflectivity of the pump light under the structure of the film system and different angles.
The light splitting film 1 is composed of 7 single-layer films, the reflectivity of the light splitting film to pump light is about 80%, and fig. 10 shows the reflectivity of the pump light under different angles and a film system structure.
The light splitting film 2 is composed of 7 single-layer films, the reflectivity of the film to the pump light is about 70%, and fig. 11 shows the reflectivity of the pump light under different angles and the film system structure.
The light splitting film 3 is composed of 7 single-layer films, the reflectivity of the film to the pump light is about 60%, and fig. 12 shows the reflectivity of the pump light under different angles and the film system structure.
The light splitting film 4 is composed of 5 single-layer films, the reflectivity of the film to the pump light is about 50%, and fig. 13 shows the reflectivity of the pump light under different angles and the film system structure.
This embodiment strips the cladding light into five segments more uniformly than in the first and second embodiments.
Example 4
As shown in fig. 14, 101-the core 102-the inner cladding 103-the outer cladding 104-the coating 200-the energy extraction layer 201-the high reflective film 202-the splitting film 1203-the splitting film 2204-the splitting film 3205-the splitting film 4300-the energy absorption layer;
an optical fiber cladding light stripper comprises a double-clad optical fiber, wherein a coating layer 104 and an outer cladding layer 103 of a preset section of the double-clad optical fiber are stripped and expose an inner cladding layer 102 containing a fiber core 101, and the surface of the inner cladding layer 102 of the preset section is sequentially plated with an energy extraction layer 200 and an energy absorption layer 300 from inside to outside; the cladding light entering the inner cladding 102 keeps a part of the cladding light reflected back to the inner cladding 102 through the energy extraction layer 200 to continue to be transmitted during the transmission process, and another part of the cladding light is transmitted to the energy absorption layer 300 through the energy extraction layer 200 to be absorbed and stripped. The energy extraction layer 200 is composed of a high-reflection film 201 and light splitting films 202, 203, 204 and 205 which are connected end to end in a segmented mode. The highly reflective film 201 and the spectroscopic films 202, 203, 204, 205 in the energy extraction layer 200 are arranged in this order along the incident direction of the cladding light. The number of the light splitting films is more than or equal to two. The high-reflection film 201 and the light splitting films 202, 203, 204 and 205 are composed of a plurality of single-layer films. The end of the energy absorption layer 300 is thickened and covered at the end of the energy extraction layer 200.
On the basis of the above embodiment, the end of the energy absorption layer 300 may be thickened and wrapped at the end of the energy extraction layer 200, and the cladding light still remaining after passing through the previous several film layers is further stripped, so as to ensure that all the cladding light is stripped as far as possible.
Taking the third embodiment as an example, most of the cladding light is stripped after the combination of the five sections of energy extraction layers and the energy absorption layers, but there may be a very small amount of residual cladding light, and the last section of energy absorption layer with a thicker thickness can absorb the residual cladding light, so that the stripper can ensure that the cladding light is uniformly stripped and simultaneously has higher stripping efficiency.
A method for manufacturing an optical fiber cladding light stripper comprises the following steps:
(1) stripping off a section of coating layer and outer cladding layer of the double-clad optical fiber by using a chemical corrosion or mechanical stripping method to expose the inner cladding layer of the section of optical fiber, and cleaning the section of optical fiber.
(2) The cleaned fiber is exposed and the length of fiber is coated using a coating process including, but not limited to, electron beam evaporation, ion beam assisted deposition, magnetron sputtering. If the energy extraction layer has a plurality of different film layers, the rear section of the optical fiber is covered, only the first section of the optical fiber is exposed outside, the position of the exposed optical fiber is changed after the film coating is finished, and the second section, the third section and the like of the energy extraction layer are sequentially coated by the same method.
(3) After all the film layers of the energy extraction layer are plated, the energy extraction layer is completely exposed, and then an absorption film layer with a certain thickness is plated outside the energy extraction layer.
The foregoing is directed to embodiments of the present invention, and equivalents, modifications, substitutions and variations such as will occur to those skilled in the art, which fall within the scope and spirit of the appended claims.
Claims (9)
1. The utility model provides an optical fiber cladding light stripper, includes double-clad fiber, the preset section coating layer and the outer cladding of double-clad fiber are peeled off and expose the inner cladding, its characterized in that: an energy extraction layer and an energy absorption layer are sequentially plated on the surface of the inner cladding layer of the preset section from inside to outside;
the cladding light entering the inner cladding keeps a part of the cladding light reflected back to the inner cladding through the energy extraction layer to continue to be transmitted in the transmission process, and the other part of the cladding light is transmitted to the energy absorption layer through the energy extraction layer to be absorbed and stripped.
2. The optical fiber cladding light stripper according to claim 1, wherein: the energy extraction layer is a high-reflection film.
3. The optical fiber cladding light stripper according to claim 1, wherein: the energy extraction layer is composed of a high-reflection film and a light splitting film which are connected end to end in a segmented mode.
4. The optical fiber cladding light stripper according to claim 3, wherein: the high-reflection film and the light splitting film in the energy extraction layer are sequentially arranged along the incident direction of the cladding light.
5. The optical fiber cladding light stripper according to claim 4, wherein: the number of the light splitting films is more than or equal to two.
6. The optical fiber cladding light stripper according to claim 2 or 3, wherein: the high-reflection film and the light splitting film are both composed of multiple single-layer films.
7. The optical fiber cladding light stripper according to claim 1, wherein: the tail end of the energy absorption layer is thickened and wrapped at the tail end of the energy extraction layer.
8. The optical fiber cladding light stripper according to claim 1, wherein: the energy absorbing layer is composed of a single layer or multiple layers of absorbing material.
9. The optical fiber cladding light stripper according to claim 8, wherein: the absorbing material at least comprises one of amorphous silicon, carbon, indium, tin, aluminum and gold.
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