CN117865454A - Preparation method of fiber core numerical aperture-adjustable integrated special optical fiber and special optical fiber - Google Patents
Preparation method of fiber core numerical aperture-adjustable integrated special optical fiber and special optical fiber Download PDFInfo
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- CN117865454A CN117865454A CN202410070653.0A CN202410070653A CN117865454A CN 117865454 A CN117865454 A CN 117865454A CN 202410070653 A CN202410070653 A CN 202410070653A CN 117865454 A CN117865454 A CN 117865454A
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- 239000000835 fiber Substances 0.000 title claims abstract description 129
- 239000013307 optical fiber Substances 0.000 title claims abstract description 71
- 238000002360 preparation method Methods 0.000 title claims abstract description 30
- 238000005253 cladding Methods 0.000 claims abstract description 86
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 82
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 68
- 238000000151 deposition Methods 0.000 claims abstract description 60
- 239000010410 layer Substances 0.000 claims abstract description 54
- 239000012792 core layer Substances 0.000 claims abstract description 50
- 238000000034 method Methods 0.000 claims abstract description 47
- 238000005229 chemical vapour deposition Methods 0.000 claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 239000012808 vapor phase Substances 0.000 claims abstract description 7
- 239000002994 raw material Substances 0.000 claims description 41
- 230000008021 deposition Effects 0.000 claims description 36
- 239000011247 coating layer Substances 0.000 claims description 13
- 239000002019 doping agent Substances 0.000 claims description 11
- 238000005530 etching Methods 0.000 claims description 11
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 8
- 229910003902 SiCl 4 Inorganic materials 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 230000007547 defect Effects 0.000 abstract description 5
- 239000012535 impurity Substances 0.000 abstract description 4
- 230000004927 fusion Effects 0.000 abstract description 2
- -1 rare earth ion Chemical class 0.000 description 11
- 230000010355 oscillation Effects 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 206010034972 Photosensitivity reaction Diseases 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 230000036211 photosensitivity Effects 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 229910003910 SiCl4 Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000007781 pre-processing Methods 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- FDNAPBUWERUEDA-UHFFFAOYSA-N silicon tetrachloride Chemical compound Cl[Si](Cl)(Cl)Cl FDNAPBUWERUEDA-UHFFFAOYSA-N 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 238000004017 vitrification Methods 0.000 description 1
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- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
The invention provides a preparation method of an integrated special optical fiber with an adjustable fiber core numerical aperture and the special optical fiber, wherein the preparation method comprises the following steps: pretreating a base pipe; depositing a preset layer number of photosensitive inner cladding layers on the inner wall of the base pipe by adopting an improved chemical vapor deposition method; depositing a preset number of rare earth doped fiber core layers on the inner side of the photosensitive inner cladding by adopting an improved chemical vapor deposition method and a rare earth ion vapor phase doping method; high-temperature fusion shrinking to form an optical fiber preform core rod; sleeving and processing the optical fiber preform core rod to form an optical fiber preform with a certain core-to-cladding ratio; and drawing the optical fiber preform rod to form the integrated special optical fiber with the adjustable fiber core numerical aperture. The preparation method provided by the invention aims to solve the problem that interface defects are easy to form or impurities are introduced in the manufacturing process of the integrated optical fiber in the traditional technology so as to influence the performance of the optical fiber, and can realize variable regulation and control of the numerical aperture of the fiber core under the condition of not changing the rare earth doping concentration of the rare earth doped fiber core layer.
Description
Technical Field
The invention relates to the technical field of optical fiber preparation, in particular to a preparation method of an integrated special optical fiber with an adjustable fiber core numerical aperture and the special optical fiber.
Background
The fiber laser has the advantages of high conversion efficiency, good beam quality, convenient thermal management, compact structure, flexible operation, simple maintenance and the like, so that the fiber laser has wide application prospect in various application fields such as laser processing, material forming, laser welding, laser cleaning and the like. In a fiber laser oscillator, a fiber bragg grating is a critical fiber optic device as a cavity mirror of an oscillation cavity. Because the traditional ultraviolet exposure method is used for writing the fiber bragg grating and has requirements on the photosensitivity of the optical fiber, the fiber bragg grating used as a cavity mirror is generally directly written on the passive optical fiber, and then the fiber bragg grating written on the passive optical fiber and the active optical fiber are welded to form an oscillation cavity, so that the fiber laser oscillator is built. The method has the advantages that the procedures from the writing of the fiber grating to the construction of the fiber laser oscillator are more, and the welding points among different fiber devices are also more, so that the welding loss of the all-fiber laser oscillator system is increased, and the production complexity is increased.
Disclosure of Invention
The invention provides a preparation method of an integrated special optical fiber with an adjustable fiber core numerical aperture and a special optical fiber, and aims to solve the problems that interface defects are easy to form or impurities are introduced in the manufacturing process of the integrated optical fiber in the prior art so as to influence the performance of the optical fiber and the process of the optical fiber, the adjustment and the control of the fiber core numerical aperture are difficult, and meanwhile, the optical fiber has more flexibility when being used for manufacturing a laser oscillation cavity at an application end.
In order to solve the problems, the invention provides a preparation method of an integrated special optical fiber with an adjustable fiber core numerical aperture, which comprises the following steps:
pretreating a base pipe;
depositing a first preset layer number of photosensitive inner cladding on the inner wall of the base pipe by adopting an improved chemical vapor deposition method;
depositing a second preset number of rare earth doped fiber core layers on the inner side of the photosensitive inner cladding by adopting an improved chemical vapor deposition method and a rare earth ion vapor phase doping method;
high temperature collapsing the base pipe to form an optical fiber preform core rod;
sleeving the optical fiber preform core rod, and processing according to a preset core-to-cladding ratio to form an optical fiber preform with a certain core-to-cladding ratio;
and drawing the optical fiber preform rod to form the special optical fiber with the adjustable fiber core numerical aperture.
According to the preparation method of the fiber core numerical aperture-adjustable integrated special optical fiber, the method for depositing the rare earth doped fiber core layer with the second preset layer number on the inner side of the photosensitive inner cladding by adopting the improved chemical vapor deposition method and the rare earth ion vapor phase doping method comprises the following steps:
depositing a second preset number of rare earth doped fiber core layers on the inner side of the photosensitive inner cladding by using a deposition raw material and a rare earth dopant raw material;
wherein the deposition raw material comprises SiCl 4 The rare earth dopant raw material comprises Yb (thd) 3 、Er(thd) 3 、Tm(thd) 3 、Ho(thd) 3 One or more of the following.
According to the preparation method of the fiber core numerical aperture adjustable integrated special optical fiber, the flow of the deposition raw material is 100-1000sccm, the flow of the rare earth dopant raw material is 10-1000sccm, and the deposition temperature is 1600-2100 ℃.
According to the preparation method of the fiber core numerical aperture-adjustable integrated special optical fiber, the method for depositing the first preset layer number of photosensitive inner cladding on the inner wall of the base pipe by adopting the improved chemical vapor deposition method comprises the following steps:
depositing a first preset layer of photosensitive inner cladding on the inner wall of the base pipe by using a deposition raw material and a photosensitive component raw material;
wherein the deposition raw material comprises SiCl 4 The photosensitive component raw material comprises GeCl 4 、BCl 3 、C 2 F 6 One or more of the following.
According to the preparation method of the fiber core numerical aperture-adjustable integrated special optical fiber, the flow of the deposition raw material is 100-1000sccm, the flow of the photosensitive component raw material is 10-1000sccm, and the deposition temperature is 1600-2100 ℃.
According to the preparation method of the fiber core numerical aperture-adjustable integrated special optical fiber, the pretreatment of the base tube comprises the following steps:
cleaning the base pipe by using hydrofluoric acid and pure water in sequence;
etching the inner wall of the base pipe by using etching gas;
wherein the etching gas comprises SF 6 C 2 F 6 One or more of the following.
According to the preparation method of the fiber core numerical aperture-adjustable integrated special optical fiber, the first preset layer number is 2-30, and the second preset layer number is 2-10.
The invention also provides an integrated special optical fiber with the adjustable fiber core numerical aperture, and the preparation method of the integrated special optical fiber with the adjustable fiber core numerical aperture is applied to any one of the above, wherein the integrated special optical fiber with the adjustable fiber core numerical aperture is provided with a rare earth doped fiber core layer and a photosensitive inner cladding layer, and the refractive index of the rare earth doped fiber core layer is larger than that of the photosensitive inner cladding layer.
According to the special fiber with the adjustable fiber core numerical aperture, the ratio of the diameter of the photosensitive inner cladding to the diameter of the rare earth doped fiber core layer is 1-4.
According to the preparation method of the fiber core numerical aperture-adjustable integrated special optical fiber and the special optical fiber, the fiber core numerical aperture-adjustable integrated special optical fiber is provided with the rare earth doped fiber core layer, the cladding layer, the first coating layer and the second coating layer, the cladding layer comprises the photosensitive inner cladding layer and the photosensitive outer cladding layer, and the refractive index of the rare earth doped fiber core layer is n 1 The refractive index of the photosensitive inner cladding is n 2 The numerical aperture of the core is na= (n) 1 2 -n 2 2 ) 1/2 The refractive index of the outer cladding is n 3 The refractive index of the first coating layer is n 4 The refractive index of the second coating layer is n 5 The numerical aperture of the cladding is na= (n) 3 2 -n 4 2 ) 1/2 And n is 5 ＞n 1 ＞n 2 ＞n 3 ＞n 4 。
According to the preparation method of the fiber core numerical aperture-adjustable integrated special optical fiber and the special optical fiber, provided by the invention, the photosensitive inner cladding and the rare earth doped fiber core layer are sequentially deposited in the radial direction in the deposition stage, so that defects caused by machining, assembling and other processes of the fiber core can be effectively avoided, and the radial integrated preparation of the photosensitive inner cladding and the rare earth doped fiber core layer is realized in the base tube; because the rare earth doped fiber core layer and the photosensitive inner cladding layer are continuous in the axial direction, the distance between the inscribing fiber gratings can be determined according to the actual use length requirement in the laser oscillation cavity, and the manufacturing of the laser oscillation cavity is more flexible; in addition, the refractive index of the photosensitive inner cladding can be regulated and controlled, and the controllable regulation of the numerical aperture of the fiber core can be realized under the condition of not changing the rare earth doping of the rare earth doped fiber core layer.
Drawings
In order to more clearly illustrate the invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a preparation method of an integrated special fiber with an adjustable fiber core numerical aperture;
FIG. 2 is a schematic view of a radial cross-section of an integrated special fiber with an adjustable core numerical aperture prepared by the method of FIG. 1;
fig. 3 is an axial structural schematic diagram of fig. 2.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In describing embodiments of the present invention, it should be noted that, unless explicitly stated and limited otherwise, the terms "coupled," "coupled," and "connected" should be construed broadly, and may be either a fixed connection, a removable connection, or an integral connection, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in embodiments of the present invention will be understood in detail by those of ordinary skill in the art.
In the description of the embodiments of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "top", "bottom", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the embodiments of the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The method for preparing the fiber core numerical aperture adjustable integrated special optical fiber of the invention is described below with reference to fig. 1 to 3.
As shown in fig. 1, the invention provides a preparation method of an integrated special optical fiber with an adjustable fiber core numerical aperture, which comprises the following steps:
s100, preprocessing a base pipe;
s200, depositing a first preset layer number of photosensitive inner cladding on the inner wall of the base pipe by adopting an improved chemical vapor deposition method;
depositing a second preset number of rare earth doped fiber core layers on the inner side of the photosensitive inner cladding by adopting an improved chemical vapor deposition method and a rare earth ion vapor phase doping method;
s400, fusing and shrinking the base pipe at high temperature to form an optical fiber preform core rod;
s500, sleeving the optical fiber preform core rod, and processing according to a preset core-to-cladding ratio to form an optical fiber preform with a certain core-to-cladding ratio;
and S600, drawing the optical fiber preform rod to form the special optical fiber with the adjustable fiber core numerical aperture.
In the technical scheme provided by the invention, a base pipe is firstly selected and is pretreated, after pretreatment, a first preset layer of photosensitive inner cladding is deposited on the inner wall of the base pipe by adopting an improved chemical vapor deposition method, and after the deposition is finished, a second preset layer of rare earth doped fiber core layer is deposited on the inner side of the photosensitive inner cladding by adopting the improved chemical vapor deposition method and a rare earth ion vapor doping method. In order to ensure the quality of the fiber core, the first preset layer number is generally set to 2-30 layers, and the second preset layer number is set to 2-10 layers. And after the deposition is finished, carrying out high-temperature fusion shrinkage on the base tube, and carrying out subsequent processing to obtain the fiber core numerical aperture-adjustable integrated special optical fiber. The rare earth doped fiber core layer mainly absorbs pump light and converts the pump light into laser, and the photosensitive inner cladding layer can be used for writing fiber gratings by utilizing the photosensitivity of the rare earth doped fiber core layer and simultaneously realizes light transmission.
According to the preparation method of the fiber core numerical aperture-adjustable integrated special optical fiber, provided by the invention, the photosensitive inner cladding and the rare earth doped fiber core layer are sequentially deposited in the radial direction in the deposition stage, so that defects caused by machining, assembling and other processes of the fiber core can be effectively avoided, and the radial integrated preparation of the photosensitive inner cladding and the rare earth doped fiber core layer is realized in the base tube; in addition, the refractive index of the photosensitive inner cladding can be regulated and controlled, so that the controllable adjustment of the numerical aperture of the fiber core can be realized under the condition of not changing the rare earth doping of the rare earth doped fiber core layer; in addition, because the rare earth doped fiber core layer and the photosensitive inner cladding layer are continuous in the axial direction, the distance between the inscribed fiber gratings can be determined according to the practical use length requirement in the laser oscillation cavity, and the manufacturing of the laser oscillation cavity is more flexible.
Specifically, depositing a second preset number of rare earth doped fiber core layers on the inner side of the photosensitive inner cladding by adopting a modified chemical vapor deposition method and a rare earth ion vapor phase doping method comprises the following steps: depositing a second preset number of rare earth doped fiber core layers on the inner side of the photosensitive inner cladding by using a deposition raw material and a rare earth dopant raw material; the deposition material comprises SiCl 4 The rare earth dopant raw material comprises Yb (thd) 3 、Er(thd) 3 、Tm(thd) 3 、Ho(thd) 3 One or more of the following. Specifically, the flow rate of the deposition raw material is 100-1000sccm, the flow rate of the rare earth dopant raw material is 10-1000sccm, and the deposition temperature is 1600-2100 ℃.
In the technical scheme provided by the invention, the rare earth doped fiber core layer is prepared by adopting a common vapor deposition raw material and a rare earth dopant raw material, and in other alternative embodiments, the rare earth doped fiber core layer can also be prepared by adopting a modified chemical vapor deposition method in combination with a rare earth ion solution doping method. Specifically, a modified chemical vapor deposition method may be first used, using SiCl as a deposition raw material 4 Depositing a matrix fiber core loose layer on the inner side of the photosensitive inner cladding, and then soaking the deposited base pipe in rare earth ion solutionIn the liquid, rare earth ions are doped in the loose layer of the matrix fiber core through soaking, then the rare earth ions are oxidized into rare earth oxides through an oxidation process, and then the loose layer of the matrix fiber core is tightly vitrified through vitrification, so that a rare earth doped fiber core layer is formed. The vitrified rare earth doped fiber core layer can be used as a basal plane to further deposit a matrix fiber core loose layer. Thus, by repeating the above steps, a second predetermined number of rare earth doped core layers may be deposited on the inner side of the photosensitive inner cladding. The rare earth ion solution is prepared from rare earth chloride YbCl 3 、ErCl 3 、TmCl 3 、HoCl 3 One or more of the following.
Correspondingly, depositing a first preset layer number of photosensitive inner cladding layer on the inner wall of the base pipe by adopting an improved chemical vapor deposition method comprises the following steps: depositing a first preset layer of photosensitive inner cladding on the inner wall of the base pipe by using a deposition raw material and a photosensitive component raw material; wherein the deposition raw material comprises SiCl 4 The photosensitive component comprises GeCl 4 、BCl 3 、C 2 F 6 One or more of the following. The flow rate of the deposition raw material is 100-1000sccm, the flow rate of the photosensitive component raw material is 10-1000sccm, and the deposition temperature is 1600-2100 ℃.
In the preparation of the optical fiber by using the improved chemical vapor deposition method, the deposition of the photosensitive inner cladding is started, and the raw materials of the photosensitive component and the SiCl4 are fed into the optical fiber, wherein the raw materials of the photosensitive component comprise GeCl 4 、BCl 3 、C 2 F 6 Setting the deposition temperature to 1600-2100 ℃, adjusting the temperature to 1600-2100 ℃ when depositing the first preset layer number, closing photosensitive component raw material feeding, starting rare earth dopant raw material feeding, depositing the rare earth doped fiber core layer, and continuing depositing the second preset layer number of rare earth doped fiber core layer.
It should also be noted that the pretreatment of the base pipe includes:
cleaning the base pipe by using hydrofluoric acid and pure water in sequence;
etching the inner wall of the base pipe by using etching gas;
wherein the engravingThe etching gas comprises SF 6 C 2 F 6 One or more of the following.
The hydrofluoric acid and the pure water are used for cleaning the base pipe, so that impurities can be removed, the cleaning of the base pipe is ensured, and the deposition quality is ensured; and then etching the inner wall of the base pipe by etching gas, so that a clean deposition surface can be formed on the inner wall of the base pipe, and the interference of impurities is avoided.
Furthermore, the invention also provides an integrated special optical fiber with the adjustable fiber core numerical aperture, and the preparation method is applied. Specifically, the refractive index of the rare earth doped fiber core layer is larger than that of the photosensitive inner cladding layer, and the ratio of the diameter of the photosensitive inner cladding layer to the diameter of the rare earth doped fiber core layer is 1-4. It should be noted that, referring to fig. 2 and 3, the special fiber with an adjustable core numerical aperture includes a rare earth doped core layer, a cladding layer, a first coating layer and a second coating layer, the refractive index of the rare earth doped core layer is n 1 The cladding comprises a photosensitive inner cladding and an outer cladding, and the refractive index of the photosensitive inner cladding is n 2 The photosensitive inner cladding corresponds to a portion of the cladding, and the numerical aperture of the core is na= (n) 1 2 -n 2 2 ) 1/2 The refractive index of the outer cladding is n 3 The refractive index of the first coating layer is n 4 The refractive index of the second coating layer is n 5 The numerical aperture of the cladding is na= (n) 3 2 -n 4 2 ) 1/2 And n is 5 ＞n 1 ＞n 2 ＞n 3 ＞n 4 . The photosensitive inner cladding can be used for writing the fiber bragg grating by utilizing the photosensitivity of the photosensitive inner cladding, and meanwhile, an optical waveguide structure is formed by utilizing the refractive index difference between the photosensitive inner cladding and the rare earth doped fiber core layer, so that the transmission of laser in the rare earth doped fiber core layer is realized, and the transmission of pump light in the photosensitive inner cladding can be realized by utilizing the optical waveguide structure formed by utilizing the refractive index difference between the photosensitive inner cladding and the outer cladding; the optical waveguide structure formed by the refractive index difference between the outer cladding layer and the coating layer can realize the transmission of pump light in the outer cladding layer. By adjusting the refractive index n of the photosensitive inner cladding 2 The variable adjustment of the numerical aperture of the fiber core is realized on the premise of not changing the rare earth doping concentration of the rare earth doped fiber core layer.
The preparation method of the fiber core numerical aperture adjustable integrated special optical fiber provided by the invention has the following advantages:
1. the photosensitive inner cladding and the rare earth doped fiber core layer are sequentially deposited in the radial direction in the in-tube deposition stage, so that defects caused by machining, assembling and other processes of the fiber core can be effectively avoided, and radial integrated preparation of the photosensitive inner cladding and the rare earth doped fiber core layer is realized in the base tube;
2. the refractive index of the photosensitive inner cladding can be changed by controlling the doping amount, and an optical waveguide structure is formed between the photosensitive inner cladding and the rare earth doped fiber core layer, so that the variable regulation and control of the fiber core numerical aperture can be realized under the condition of not changing the rare earth doping concentration of the rare earth doped fiber core layer;
3. because the rare earth doped fiber core layer and the photosensitive inner cladding layer are continuous in the axial direction, the distance between the inscribed fiber gratings can be determined according to the actual use length requirement in the laser oscillation cavity, so that the method has flexibility and is more flexible for manufacturing the laser oscillation cavity;
4. the sequential deposition of the photosensitive fiber core and the rare earth doped fiber core is realized in the preparation stage of the core rod, in addition, the reaction temperature and the gas feeding can be automatically controlled by adopting deposition equipment, the operation is simple, the artificial influence is small, and the stability is good.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The preparation method of the special fiber with the adjustable fiber core numerical aperture is characterized by comprising the following steps of:
pretreating a base pipe;
depositing a first preset layer number of photosensitive inner cladding on the inner wall of the base pipe by adopting an improved chemical vapor deposition method;
depositing a second preset number of rare earth doped fiber core layers on the inner side of the photosensitive inner cladding by adopting an improved chemical vapor deposition method and a rare earth ion vapor phase doping method;
high temperature collapsing the base pipe to form an optical fiber preform core rod;
sleeving the optical fiber preform core rod, and processing according to a preset core-to-cladding ratio to form an optical fiber preform with a certain core-to-cladding ratio;
and drawing the optical fiber preform rod to form the special optical fiber with the adjustable fiber core numerical aperture.
2. The method for preparing the fiber core numerical aperture adjustable integrated special optical fiber according to claim 1, wherein the depositing the second preset number of rare earth doped fiber core layers on the inner side of the photosensitive inner cladding layer by adopting a modified chemical vapor deposition method and a rare earth ion vapor phase doping method comprises:
depositing a second preset number of rare earth doped fiber core layers on the inner side of the photosensitive inner cladding by using a deposition raw material and a rare earth dopant raw material;
wherein the deposition raw material comprises SiCl 4 The rare earth dopant raw material comprises Yb (thd) 3 、Er(thd) 3 、Tm(thd) 3 、Ho(thd) 3 One or more of the following.
3. The method for preparing the fiber core numerical aperture adjustable integrated special optical fiber according to claim 2, wherein the flow rate of the deposition raw material is 100-1000sccm, the flow rate of the rare earth dopant raw material is 10-1000sccm, and the deposition temperature is 1600-2100 ℃.
4. The method for preparing the fiber core numerical aperture adjustable integrated special optical fiber according to claim 1, wherein the depositing the first preset layer number of photosensitive inner cladding layer on the inner wall of the base pipe by adopting the improved chemical vapor deposition method comprises the following steps:
depositing a first preset layer of photosensitive inner cladding on the inner wall of the base pipe by using a deposition raw material and a photosensitive component raw material;
wherein the deposition raw material comprises SiCl 4 The photosensitive component raw material comprises GeCl 4 、BCl 3 、C 2 F 6 One or more of the following.
5. The method for manufacturing an integrated special optical fiber with an adjustable core numerical aperture according to claim 4, wherein the flow rate of the deposition raw material is 100-1000sccm, the flow rate of the photosensitive component raw material is 10-1000sccm, and the deposition temperature is 1600-2100 ℃.
6. The method for manufacturing an integrated special optical fiber with an adjustable fiber core numerical aperture according to claim 1, wherein the pretreatment of the base tube comprises:
cleaning the base pipe by using hydrofluoric acid and pure water in sequence;
etching the inner wall of the base pipe by using etching gas;
wherein the etching gas comprises SF 6 C 2 F 6 One or more of the following.
7. The method for preparing the fiber core numerical aperture adjustable integrated special optical fiber according to claim 1, wherein the first preset layer number is 2-30 layers, and the second preset layer number is 2-10 layers.
8. The special fiber with the adjustable fiber core numerical aperture, which is applied to the preparation method of the special fiber with the adjustable fiber core numerical aperture according to any one of claims 1 to 7, is characterized by comprising a rare earth doped fiber core layer and a photosensitive inner cladding layer, wherein the refractive index of the rare earth doped fiber core layer is larger than that of the photosensitive inner cladding layer.
9. The fiber core numerical aperture adjustable integrated special optical fiber according to claim 8, wherein the ratio of the diameter of the photosensitive inner cladding to the diameter of the rare earth doped core layer is 1-4.
10. The fiber core numerical aperture adjustable integral special fiber of claim 8, wherein the fiber core numerical aperture adjustable integral special fiber has the rare earth doped core layer, a cladding layer, a first coating layer and a second coating layer, the cladding layer comprises the photosensitive inner cladding layer and an outer cladding layer, the refractive index of the rare earth doped core is n 1 The refractive index of the photosensitive inner cladding is n 2 The numerical aperture of the core is na= (n) 1 2 -n 2 2 ) 1/2 The refractive index of the outer cladding is n 3 The refractive index of the first coating layer is n 4 The refractive index of the second coating layer is n 5 The numerical aperture of the cladding is na= (n) 3 2 -n 4 2 ) 1/2 And n is 5 ＞n 1 ＞n 2 ＞n 3 ＞n 4 。
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410070653.0A CN117865454A (en) | 2024-01-17 | 2024-01-17 | Preparation method of fiber core numerical aperture-adjustable integrated special optical fiber and special optical fiber |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410070653.0A CN117865454A (en) | 2024-01-17 | 2024-01-17 | Preparation method of fiber core numerical aperture-adjustable integrated special optical fiber and special optical fiber |
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| CN117865454A true CN117865454A (en) | 2024-04-12 |
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| CN202410070653.0A Pending CN117865454A (en) | 2024-01-17 | 2024-01-17 | Preparation method of fiber core numerical aperture-adjustable integrated special optical fiber and special optical fiber |
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