CN117865453A - Preparation method of radial integrated special optical fiber and special optical fiber - Google Patents
Preparation method of radial integrated special optical fiber and special optical fiber Download PDFInfo
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- CN117865453A CN117865453A CN202410070562.7A CN202410070562A CN117865453A CN 117865453 A CN117865453 A CN 117865453A CN 202410070562 A CN202410070562 A CN 202410070562A CN 117865453 A CN117865453 A CN 117865453A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 78
- 238000002360 preparation method Methods 0.000 title claims abstract description 26
- 239000000835 fiber Substances 0.000 claims abstract description 147
- 239000012792 core layer Substances 0.000 claims abstract description 114
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 69
- 238000000151 deposition Methods 0.000 claims abstract description 65
- 238000000034 method Methods 0.000 claims abstract description 58
- 150000002910 rare earth metals Chemical class 0.000 claims abstract description 46
- 238000005229 chemical vapour deposition Methods 0.000 claims abstract description 26
- 238000005253 cladding Methods 0.000 claims abstract description 21
- 230000008021 deposition Effects 0.000 claims description 39
- 239000010410 layer Substances 0.000 claims description 30
- 239000002994 raw material Substances 0.000 claims description 26
- -1 rare earth ion Chemical class 0.000 claims description 22
- 239000011159 matrix material Substances 0.000 claims description 16
- 239000011247 coating layer Substances 0.000 claims description 15
- 238000005530 etching Methods 0.000 claims description 11
- 230000001590 oxidative effect Effects 0.000 claims description 9
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 8
- 229910003902 SiCl 4 Inorganic materials 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 5
- 238000005245 sintering Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 abstract description 19
- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000007547 defect Effects 0.000 abstract description 5
- 239000012535 impurity Substances 0.000 abstract description 4
- 230000004927 fusion Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 206010034972 Photosensitivity reaction Diseases 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 230000036211 photosensitivity Effects 0.000 description 5
- 230000003321 amplification Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000004017 vitrification Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002019 doping agent 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
- 238000007781 pre-processing Methods 0.000 description 1
- 229910001404 rare earth metal oxide Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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Abstract
The invention provides a preparation method of radial integrated special optical fiber and the special optical fiber, the method comprises the following steps: pretreating a base pipe; depositing a first preset number of photosensitive fiber core layers 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 fiber core layer by adopting an improved chemical vapor deposition method and a rare earth ion solution 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; drawing the optical fiber preform rod to form a radial integrated special optical fiber; the refractive index of the photosensitive fiber core layer in the fiber core is consistent with that of the rare earth doped fiber core layer. The preparation method provided by the invention 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 traditional technology so as to influence the performance of the optical fiber; and is beneficial to amplifying the fundamental mode and inhibiting the gain of the high-order mode when being applied to the laser oscillation cavity.
Description
Technical Field
The invention relates to the technical field of optical fiber preparation, in particular to a preparation method of a radial integrated special optical fiber 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 a radial integrated special optical fiber and the 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 is complex; meanwhile, when the application end is used for the laser oscillation cavity, the amplification of the fundamental mode in the laser oscillation cavity is facilitated, the gain of the high-order mode is restrained, the gain control of different modes in the laser oscillation cavity is realized, and the laser oscillation cavity is more flexible in manufacturing.
In order to solve the above problems, the present invention provides a method for preparing a radial integrated special optical fiber, comprising:
pretreating a base pipe;
depositing a first preset number of photosensitive fiber core layers 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 fiber core layer by adopting an improved chemical vapor deposition method and a rare earth ion solution 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 radial integrated special optical fiber.
According to the preparation method of the radial integrated special optical fiber, the method for depositing the second preset number of rare earth doped fiber core layers on the inner side of the photosensitive fiber core layer by adopting the improved chemical vapor deposition method and the rare earth ion solution doping method comprises the following steps:
step one, depositing a matrix fiber core loose layer on the inner side of the photosensitive fiber core layer by adopting an improved chemical vapor deposition method;
step two, soaking the base tube in a rare earth ion solution, and sequentially oxidizing and vitrifying the soaked base tube to form a rare earth doped fiber core layer on the inner side of the photosensitive fiber core layer;
repeating the first step and the second step to deposit the rare earth doped fiber core layer with a second preset layer number on the inner side of the photosensitive fiber core layer.
According to the preparation method of the radial integrated special optical fiber, the method for depositing the matrix fiber core loose layer on the inner side of the photosensitive fiber core layer by adopting the improved chemical vapor deposition method comprises the following steps:
depositing a matrix core-loosening layer on the inner side of the photosensitive core layer by using a deposition raw material;
wherein the deposition raw material comprises SiCl 4 The flow of the deposition raw material is 100-1000sccm, and the deposition temperature is 1000-1600 ℃.
According to the preparation method of the radial integrated special optical fiber provided by the invention, 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.
According to the preparation method of the radial integrated special optical fiber provided by the invention, the sequentially oxidizing and vitrifying the immersed base tube comprises the following steps:
oxidizing the adulterants in the loose layer deposited on the inner wall of the base pipe in an oxygen atmosphere;
and (3) carrying out high-temperature sintering on the oxidized loose layer deposited on the inner wall of the base pipe.
According to the preparation method of the radial integrated special optical fiber provided by the invention, the deposition of the first preset number of photosensitive fiber core layers on the inner wall of the base pipe by adopting the improved chemical vapor deposition method comprises the following steps: depositing a first preset number of photosensitive fiber core layers 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 radial 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 radial integrated special optical fiber provided by the invention, the pretreatment of the base pipe 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.
The invention also provides a radial integrated special optical fiber, and the radial integrated special optical fiber comprises a rare earth doped fiber core layer and a photosensitive fiber core layer, wherein the refractive index of the rare earth doped fiber core layer is equal to that of the photosensitive fiber core layer.
According to the radial integrated special optical fiber provided by the invention, the radial integrated special optical fiber is provided with a fiber core layer, a cladding layer, a first coating layer and a second coating layer, wherein the refractive index of the fiber core layer is n 1 The refractive index of the cladding is n 2 The numerical aperture of the core layer is na= (n) 1 2 -n 2 2 ) 1/2 The refractive index of the first coating layer is n 3 The refractive index of the second coating layer is n 4 The numerical aperture of the cladding is na= (n) 2 2 -n 3 2)1/2 And n is 4 ＞n 1 ＞n 2 ＞n 3 。
According to the preparation method of the radial integrated special optical fiber, the photosensitive fiber core layer and the rare earth doped fiber core layer are sequentially deposited in the radial direction in the fiber core 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 fiber core and the rare earth doped fiber core is realized in the base tube; the refractive indexes of the photosensitive fiber core layer and the rare earth doped fiber core layer are kept consistent, and the photosensitive fiber core layer and the rare earth doped fiber core layer form the fiber core of the special optical fiber, so that the amplification of a fundamental mode in a laser oscillation cavity is facilitated, the gain of a higher-order mode is restrained, and the gain control of different modes in the laser oscillation cavity is realized; in addition, because the rare earth doped fiber core layer and the photosensitive fiber core 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, and the manufacturing of the laser oscillation cavity is more flexible.
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 a radial integrated special optical fiber;
FIG. 2 is a schematic view of a radial cross-sectional structure of a radial integrated optical fiber 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 radial integrated special optical fiber and the special optical fiber according to the present invention are described below with reference to fig. 1 to 3.
As shown in fig. 1, the present invention provides a method for preparing a radial integrated special optical fiber, comprising:
s100, preprocessing a base pipe;
s200, depositing a first preset number of photosensitive fiber core layers on the inner wall of the base pipe by adopting an improved chemical vapor deposition method;
s300, depositing a second preset number of rare earth doped fiber core layers on the inner side of the photosensitive fiber core layer by adopting an improved chemical vapor deposition method and a rare earth ion solution 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 radial integrated special optical fiber.
In the technical scheme provided by the invention, a base pipe is firstly selected and is pretreated, after pretreatment, a first preset number of photosensitive fiber core layers are 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 number of rare earth doped fiber core layers are deposited on the inner side of the photosensitive fiber core layers by adopting the improved chemical vapor deposition method and a rare earth ion solution doping method. In order to ensure the quality of the fiber core, the first preset layer number and the second preset layer number are generally set to be 2-10 layers. And after the deposition is finished, carrying out high-temperature fusion shrinkage and processing on the base tube, and thus obtaining the radial integrated special optical fiber. The rare earth doped fiber core layer mainly absorbs pump light and converts the pump light into laser, the photosensitive fiber core layer can be used for writing fiber gratings by utilizing the photosensitivity of the fiber core layer, and meanwhile, light transmission is realized by utilizing an optical waveguide formed between the fiber core layer and the cladding layer.
According to the preparation method of the radial integrated special optical fiber, the photosensitive fiber core layer and the rare earth doped fiber core layer are sequentially deposited in the radial direction in the fiber core 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 fiber core and the rare earth doped fiber core is realized in the base tube; the refractive indexes of the photosensitive fiber core layer and the rare earth doped fiber core layer are kept consistent, and the photosensitive fiber core layer and the rare earth doped fiber core layer form the fiber core of the special optical fiber, so that the amplification of a fundamental mode in a laser oscillation cavity is facilitated, the gain of a higher-order mode is restrained, and the gain control of different modes in the laser oscillation cavity is realized; in addition, because the rare earth doped fiber core layer and the photosensitive fiber core 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 fiber core layer by adopting a modified chemical vapor deposition method and a rare earth ion solution doping method comprises the following steps:
step one, depositing a matrix fiber core loose layer on the inner side of the photosensitive fiber core layer by adopting an improved chemical vapor deposition method;
step two, soaking the base tube in a rare earth ion solution, and sequentially oxidizing and vitrifying the soaked base tube to form a rare earth doped fiber core layer on the inner side of the photosensitive fiber core layer;
repeating the first step and the second step to deposit the rare earth doped fiber core layer with a second preset layer number on the inner side of the photosensitive fiber core layer.
Rare earth doped fiber in the inventionThe core layer is prepared by combining a modified chemical vapor deposition method with a rare earth ion solution doping method, a matrix fiber core loose layer is firstly deposited on the inner side of a photosensitive fiber core layer by using the modified chemical vapor deposition method, then a deposited base pipe is soaked in the rare earth ion solution, rare earth ions are doped in the matrix fiber core loose layer through soaking, the rare earth ions are oxidized into rare earth oxides through an oxidation process, and then the matrix fiber core loose layer is tightly vitrified through vitrification to form the rare earth doped fiber core layer. The vitrified rare earth doped fiber core layer can be used as a basal plane to further deposit a matrix fiber core loose layer. Therefore, by repeating the first and second steps, a second preset number of rare earth doped core layers can be deposited on the inner side of the photosensitive core layer. It should be noted that, in other alternative embodiments, the rare earth doped core layer may also be prepared by a modified chemical vapor deposition method in combination with a rare earth ion vapor doping method, specifically, the material may be controlled to be matrix SiCl 4 Vapor deposition with a rare earth dopant, yb (thd) 3 、Er(thd) 3 、Tm(thd) 3 、Ho(thd) 3 One or more of these components, and thus may not require oxidation and vitrification.
Specifically, depositing a matrix core loose layer on the inner side of the photosensitive core layer by adopting a modified chemical vapor deposition method comprises: depositing a matrix core-loosening layer on the inner side of the photosensitive core layer by using a deposition raw material; wherein the deposition raw material comprises SiCl 4 The flow rate of the deposition raw material is 100-1000sccm, and the deposition temperature is 1000-1600 ℃. Further, 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. In practical application, an improved chemical vapor deposition device can be used for deposition, taking the preparation of rare earth doped fiber core layer as an example, firstly, the material is controlled to be matrix SiCl 4 The deposition temperature is set to 1000-1600 ℃, when the deposition is completed, the base pipe is taken down to be soaked in rare earth ion solution, and oxidation and vitrification are carried out after the soaking is completed, and then the next deposition is continued.
Further, oxidizing and vitrifying the immersed base pipe in sequence includes:
oxidizing the adulterants in the loose layer on the inner wall of the base pipe in an oxygen atmosphere;
and sintering the loose layer on the inner wall of the base pipe after oxidation at a high temperature.
Specifically, the temperature in the oxidation process is 1200-1800 ℃, and the temperature of high-temperature sintering is 1800-2100 ℃.
Further, depositing a first preset number of photosensitive fiber core layers on the inner wall of the base pipe by adopting a modified chemical vapor deposition method comprises the following steps: depositing a first preset number of photosensitive fiber core layers 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 ℃. Wherein GeO is 2 Can increase the photosensitivity and refractive index of the fiber core, B 2 O 3 The photosensitivity of the fiber core can be increased and the refractive index can be reduced, and the deposition of the photosensitive fiber core layer on the matrix fiber core layer is similar, so that the invention is not repeated.
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 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.
The invention also provides a radial integrated special optical fiber, which is prepared by the preparation method, wherein the refractive index of the rare earth doped fiber core layer and the refractive index of the photosensitive fiber core layer of the optical fiberThe rates are equal. The rare earth doped fiber core layer mainly realizes the absorption of pump light and converts the pump light into laser, the photosensitive fiber core layer can be used for writing fiber gratings by utilizing the photosensitivity of the fiber core layer, and meanwhile, the light transmission is realized by utilizing the optical waveguide formed by the fiber core layer and the cladding. Further, the radial integrated special optical fiber is provided with a fiber core layer, a cladding layer, a first coating layer and a second coating layer, wherein the refractive index of the fiber core layer is n 1 Namely, the refractive indexes of the rare earth doped fiber core layer and the photosensitive fiber core layer are n 1 . The refractive index of the cladding is n 2 The numerical aperture of the core layer is na= (n) 1 2 -n 2 2 ) 1/2 The optical waveguide structure formed between the fiber core and the cladding can realize the transmission of laser in the fiber core. The refractive index of the first coating layer is n 3 The refractive index of the second coating layer is n 4 The numerical aperture of the cladding is na= (n) 2 2 -n 3 2 ) 1/2 And n is 4 ＞n 1 ＞n 2 ＞n 3 . The optical waveguide structure formed by the refractive index difference between the cladding layer and the first coating layer can realize the transmission of pump light in the cladding layer, and the second coating layer can protect the first coating layer and ensure the strength of the special optical fiber.
The preparation method of the radial integrated special optical fiber and the special optical fiber provided by the invention have the following advantages:
1. by sequentially depositing the photosensitive fiber core layer and the rare earth doped fiber core layer in the radial direction in the fiber core deposition stage, defects caused by machining, assembling and other processes of the fiber core can be effectively avoided, and radial integrated preparation of the photosensitive fiber core and the rare earth doped fiber core is realized in the base pipe;
2. the refractive indexes of the photosensitive fiber core layer and the rare earth doped fiber core layer are kept consistent, and the photosensitive fiber core layer and the rare earth doped fiber core layer form the fiber core of the special optical fiber, so that amplification of a fundamental mode in a laser oscillation cavity is facilitated, gain of a high-order mode is restrained, gain control of different modes in the laser oscillation cavity is realized, and further output power of the optical fiber laser is further improved;
3. because the rare earth doped fiber core layer and the photosensitive fiber core 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 radial integrated special optical fiber is characterized by comprising the following steps of:
pretreating a base pipe;
depositing a first preset number of photosensitive fiber core layers 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 fiber core layer by adopting an improved chemical vapor deposition method and a rare earth ion solution 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 radial integrated special optical fiber.
2. The method for preparing a radial integrated special optical fiber according to claim 1, wherein depositing a second preset number of rare earth doped core layers on the inner side of the photosensitive core layer by adopting a modified chemical vapor deposition method in combination with a rare earth ion solution doping method comprises:
step one, depositing a matrix fiber core loose layer on the inner side of the photosensitive fiber core layer by adopting an improved chemical vapor deposition method;
step two, soaking the base tube in a rare earth ion solution, and sequentially oxidizing and vitrifying the soaked base tube to form a rare earth doped fiber core layer on the inner side of the photosensitive fiber core layer;
repeating the first step and the second step to deposit the rare earth doped fiber core layer with a second preset layer number on the inner side of the photosensitive fiber core layer.
3. The method of claim 2, wherein depositing a matrix core layer on the inside of the photosensitive core layer using a modified chemical vapor deposition process comprises:
depositing a matrix core-loosening layer on the inner side of the photosensitive core layer by using a deposition raw material;
wherein the deposition raw material comprises SiCl 4 The flow of the deposition raw material is 100-1000sccm, and the deposition temperature is 1000-1600 ℃.
4. The method for preparing the radial integrated special optical fiber according to claim 3, wherein 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.
5. The method for preparing a radial integrated special optical fiber according to claim 2, wherein sequentially oxidizing and vitrifying the immersed base tube comprises:
oxidizing the adulterants in the loose layer on the inner wall of the base pipe in an oxygen atmosphere;
and sintering the oxidized loose layer on the inner wall of the base pipe at a high temperature.
6. The method of claim 1, wherein depositing a first predetermined number of photosensitive core layers on the inner wall of the base pipe by modified chemical vapor deposition comprises: depositing a first preset number of photosensitive fiber core layers 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.
7. The method for preparing a radial integrated optical fiber according to claim 6, 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 ℃.
8. The method of preparing a radial integrated optical fiber according to claim 1, wherein the pre-treating the base pipe 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.
9. A radial integrated special optical fiber, and a preparation method thereof according to any one of claims 1-8, wherein the fiber core layer of the radial integrated special optical fiber comprises a rare earth doped fiber core layer and a photosensitive fiber core layer, and the refractive index of the rare earth doped fiber core layer is equal to that of the photosensitive fiber core layer.
10. The radially integrated optical fiber according to claim 9, wherein the radially integrated optical fiber has the core layer, the cladding layer, the first coating layer, and the second coating layer, the core layerRefractive index n 1 The refractive index of the cladding is n 2 The numerical aperture of the core layer is na= (n) 1 2 -n 2 2 ) 1/2 The refractive index of the first coating layer is n 3 The refractive index of the second coating layer is n 4 The numerical aperture of the cladding is na= (n) 2 2 -n 3 2 ) 1/2 And n is 4 ＞n 1 ＞n 2 ＞n 3 。
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| CN202410070562.7A CN117865453A (en) | 2024-01-17 | 2024-01-17 | Preparation method of radial integrated special optical fiber and special optical fiber |
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| CN202410070562.7A CN117865453A (en) | 2024-01-17 | 2024-01-17 | Preparation method of radial integrated special optical fiber and special optical fiber |
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