CN113009618A - Method for preparing chirped fiber grating by femtosecond laser direct writing technology - Google Patents
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- CN113009618A CN113009618A CN202110307931.6A CN202110307931A CN113009618A CN 113009618 A CN113009618 A CN 113009618A CN 202110307931 A CN202110307931 A CN 202110307931A CN 113009618 A CN113009618 A CN 113009618A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/02123—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating
- G02B6/02147—Point by point fabrication, i.e. grating elements induced one step at a time along the fibre, e.g. by scanning a laser beam, arc discharge scanning
Abstract
The invention discloses a method for preparing chirped fiber grating by using femtosecond laser direct writing technology, belonging to the technical field of fiber grating manufacturing. Because the femtosecond laser point-by-point direct writing method can generate larger refractive index modulation in the fiber core of the optical fiber, the chirped fiber grating with the large half peak width and high reflectivity can be obtained on a shorter grating structure. Based on the excellent performance of the high-power photonic crystal fiber laser, the invention adopts an electric control three-dimensional precision moving platform (Aerotech ABL10050L-LN/UPPER and BOCIC MRS100Series) written by A3200Motion Composer software and a shutter switch linkage control program, and can realize the processing of the chirped fiber grating with different parameters in a single mode fiber by setting different processing parameters. The invention has the advantages of low cost, high flexibility, simple operation, high automation degree and the like, and has good application prospect.
Description
Technical Field
The invention belongs to the technical field of fiber gratings, and particularly relates to a method for preparing a chirped fiber grating by using a femtosecond laser direct writing technology, in particular to pretreatment of an optical fiber, a femtosecond laser point-by-point writing process and annealing treatment of the prepared grating, so that high-quality chirped grating can be efficiently and conveniently prepared.
Background
The chirped fiber grating is an important branch of the fiber grating, and plays an important role in the fields of fiber sensing, fiber lasers, fiber communication and the like. The conventional method of manufacturing chirped fiber gratings is the phase mask method. However, the phase mask method requires the phase mask to be manufactured in advance, and when the chirped fiber grating with different parameters needs to be manufactured, the phase mask with corresponding different parameters must be manufactured in advance to meet the requirement of manufacturing a specific grating, so the method has the disadvantages of complex processing steps, high cost, long time consumption and the like. The femtosecond laser direct writing method enables the fiber core to generate periodic refractive index modulation by focusing laser beams in the direct optical fiber without using a mask, and has the advantages of high processing efficiency, simplicity in operation, high flexibility and the like. Particularly, with the occurrence of femtosecond laser with good processing performances such as ultrashort pulse width, ultrastrong peak power and the like and the optimization of various precise optical components, the preparation of high-quality chirped fiber grating through a femtosecond laser direct writing method becomes possible.
Disclosure of Invention
Aiming at the defects in the existing technology for manufacturing the chirped fiber grating, the invention provides a method for manufacturing the chirped fiber grating on a single-mode fiber by using a femtosecond laser point-to-point direct writing technology. Aiming at the structural characteristic that the grating period of the chirped fiber grating to be processed gradually increases along the axial direction, a variable-speed scanning mode is adopted to replace constant-speed scanning in general processing, and the chirped grating structure can be directly written on the single-mode fiber. The relationship between the chirped grating period and the scanning acceleration is Λ ═ s/f, wherein Λ is the grating period of the chirped fiber grating, s is the scanning speed of the femtosecond laser, and f is the repetition frequency of the femtosecond laser. Because the femtosecond laser is focused in the fiber core of the optical fiber to enable the laser to have ultrahigh energy density, the interaction region of the femtosecond laser and the fiber core of the optical fiber generates heat effect, and the multiphoton ionization effect enables the fiber core position of the laser focused optical fiber to generate permanent refractive index change, the obtained chirped grating has high reflectivity. The invention adopts a high repetition frequency femtosecond laser as a light source, adopts A3200Motion Composer software to write a program to control the Motion of a precise three-dimensional moving platform, and leads the period of the manufactured chirped fiber grating to accord with the pre-designed program and scheme by precisely regulating and controlling the change of the distance between the focusing focuses of the femtosecond laser. In addition, the invention adopts a thermal annealing mode, releases the residual stress in the processing process of the fiber grating and optimizes the optical characteristics of the chirped fiber grating.
The invention is realized by the following technical scheme:
a method for preparing chirped fiber grating by using femtosecond laser direct writing technology comprises the following specific steps:
the method comprises the following steps: pretreating an optical fiber to be processed;
firstly, intercepting a section of single mode fiber with a certain length, and removing an optical fiber coating layer at a part to be processed by using an optical fiber wire stripper to expose an optical fiber cladding in the air; wiping and washing the optical fiber without the cladding by ethanol and deionized water in sequence to ensure that no coating layer is left on the surface of the optical fiber, and finally drying the deionized water on the surface of the optical fiber to finish the pretreatment of the single-mode optical fiber to be processed;
step two: writing chirped grating in the optical fiber point by femtosecond laser;
firstly, fixing an optical fiber to be processed on a three-dimensional platform, and immersing a processing part in mirror oil to eliminate the difference of the cylindrical section of the optical fiber; the femtosecond laser amplifier emits femtosecond laser after frequency multiplication, the laser is focused in the optical fiber core after passing through a frequency multiplication crystal, a beam expanding collimation system, a dichroic mirror and an oil immersion objective, the laser focusing position can be observed through a CCD camera, and meanwhile, the laser focusing position can be changed by adjusting a three-dimensional platform; and then, inputting a preset processing program in software, controlling the three-dimensional platform to perform variable-speed motion, performing variable-speed scanning processing on the three-dimensional platform along the axial direction of the optical fiber, and changing the processing parameters to change the distance between the points of the laser focused in the fiber core with different amplitudes so as to manufacture the chirped fiber grating with different chirps.
Step three: taking out and annealing the chirped fiber grating;
firstly, taking out the chirped grating manufactured by the femtosecond laser point-by-point direct writing method in the second step, wiping mirror oil on the surface of the optical fiber by cotton soaked by ethanol, then washing the optical fiber by deionized water, and finally drying the optical fiber; and then, placing the washed fiber grating sample in a tube furnace, heating to 400-800 ℃, keeping the constant temperature for 1-3 hours, and taking out after the fiber grating sample is cooled to room temperature. The thermal annealing method can release the residual stress of the fiber grating in the processing process, and optimizes the optical characteristics of the chirped fiber grating.
Further, the length of the single-mode optical fiber intercepted in the first step is 20cm-80 cm.
Furthermore, the femtosecond laser source used in the second step is a high repetition frequency femtosecond laser system with a central wavelength of 1030nm and composed of an oscillation stage and an amplification stage.
Further, the variable speed scanning processing of the second step, the initial and final speed of which is related to the femtosecond laser pulse frequency, according to the difference of the femtosecond laser pulse frequency, the initial speed of the three-dimensional platform movement is controlled to be 0.0427mm/s-4.2681mm/s, the final speed is controlled to be 0.0431mm/s-4.3032mm/s, and the acceleration is controlled to be 0.0002mm/s2-2.1112mm/s2(ii) a The scanning mode is point-by-point scanning.
Furthermore, in the variable-speed scanning processing of the step two, the femtosecond laser repetition frequency is controlled to be 40Hz to 4000Hz, and the single-pulse energy is controlled to be 50nJ to 150 nJ.
Further, the three-dimensional platform used in the second step consists of a three-dimensional manual platform and a three-dimensional electric control platform; the moving range of the X axis and the Y axis of the three-dimensional manual platform is 0-5cm, the moving range of the Z axis is 0-1cm, and the precision is 1 mu m; the Z axis and the X axis of the three-dimensional electric control platform are piezoelectric platforms, the moving range of the Z axis is 0-25 mu m, the precision is 1-10nm, the moving range of the X axis is 0-200 mu m, the precision is 1-10nm, the position of a laser focus is controlled by the Y axis through computer A3200Motion Composer software, the moving precision is 10-100nm, and the maximum moving length is 20 mu m.
Further, the refractive index of the mirror oil used in the second step is 1.4-1.5.
Further, the tube furnace used in the third step is an open-type tube furnace; the upper temperature limit of the tube furnace is 1600 ℃ and the precision is +/-1 ℃.
Compared with the prior art, the invention has the following advantages:
(1) the chirped fiber grating is manufactured in the single-mode fiber by adopting a femtosecond laser point-by-point direct writing method, the conventional method for manufacturing the chirped fiber grating is mainly a phase mask method, and when the chirped fiber grating is manufactured by the phase mask method, different mask plates are required to be matched with the chirped fiber grating for manufacturing different parameters; compared with a phase mask method, the method does not need a phase mask which is expensive and has a complex manufacturing process, and the parameters of the manufactured chirped fiber grating can be flexibly adjusted and are not limited by the parameters of the mask and the like;
(2) compared with the existing phase mask method, the method adopted by the invention can generate larger refractive index modulation amount in the fiber core of the fiber, the maximum refractive index modulation amount can reach about 0.005, and the chirped fiber grating with higher reflectivity can be manufactured in a structure with the same length or manufactured with larger half-peak width under the condition of keeping a certain reflectivity; the method adopted by the invention can manufacture the chirped fiber grating with the chirp rate of more than 6.897nm/cm and the reflectivity of more than 80 percent, and is superior to the prior method.
(3) The invention adopts the program written by A3200Motion Composer software to control the three-dimensional platform and the shutter switch, can write chirped gratings with different parameters on a single-mode optical fiber by setting different processing programs, and has the advantages of low cost, high flexibility, simple operation, high automation degree and the like.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic view of a femtosecond laser processing optical path of a method for fabricating a chirped fiber grating using a femtosecond laser direct writing technique according to the present invention; the laser sequentially passes through a frequency doubling crystal BBO, a first total reflector M1, a shutter, a concave lens L1, a convex lens L2, a dichroic mirror M2 and an oil immersion objective lens L3 and then is focused on an optical fiber core; then, the light emitted by the mercury lamp light source reaches the CCD camera through the optical fiber, the oil immersion objective lens and the dichroic mirror;
FIG. 2 is a schematic structural diagram of a chirped fiber grating according to a method for fabricating a chirped fiber grating by a femtosecond laser direct writing technology according to the present invention;
FIG. 3 is a microscope image of the beginning and end of a chirped fiber grating according to a method for manufacturing a chirped fiber grating using a femtosecond laser direct writing technique according to the present invention;
FIG. 4 is a graph of the transmission spectrum and reflection spectrum of a 2nm half-peak-width chirped fiber grating according to a method for fabricating a chirped fiber grating using a femtosecond laser direct writing technique according to the present invention;
FIG. 5 is a group delay curve of a 2nm half-peak width chirped fiber grating according to a method for fabricating a chirped fiber grating using a femtosecond laser direct writing technique according to the present invention;
fig. 6 is a reflection spectrum and group delay curve of a 12nm half-peak-width chirped fiber grating according to a method for preparing a chirped fiber grating by a femtosecond laser direct writing technology.
Detailed Description
The following embodiments are only used for illustrating the technical solutions of the present invention more clearly, and therefore, the following embodiments are only used as examples, and the protection scope of the present invention is not limited thereby.
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
Example 1
Example 1:
the chirped fiber grating with the half-peak width of 2nm is prepared by using a femtosecond laser direct writing technology.
The processing system diagram of embodiment 1 of the invention is as shown in fig. 1, wherein the emergent light of a laser passes through a frequency doubling crystal, the wavelength of the frequency doubled femtosecond laser with the wavelength of 1030nm is converted into 515nm, and the converted laser is focused on an optical fiber through a beam expanding collimation system, a dichroic mirror and an oil immersion objective lens; the used optical fiber is single mode optical fiber (CORNING-28e), the diameter of the fiber core of the optical fiber is 9 μm, and the diameter of the cladding of the optical fiber is 125 μm; emergent light of the mercury lamp light source reaches the CCD camera through the optical fiber, the objective lens, the aluminum reflecting mirror M2 and the dichroic mirror; the electric control shutter and the electric control three-dimensional mobile platform are connected with a computer and can be simultaneously controlled by an A3200Motion Composer program; the CCD camera is also connected with the computer, and the processing image is collected in real time to detect the processing process.
The three-dimensional processing system used by the embodiment of the invention comprises a laser, a light path, an optical fiber clamp, a CCD camera and a computer; laser emitted by the laser sequentially passes through a frequency doubling crystal BBO, a first total reflector M1, a concave lens L1, a convex lens L2, a dichroic mirror M2 and an oil immersion objective lens L3 and then is focused on an optical fiber core; in addition, the light emitted by the mercury lamp light source passes through the oil immersion objective lens L3 and the dichroic mirror M2 and reaches the CCD camera.
A method for preparing chirped fiber grating by using femtosecond laser direct writing technology comprises the following specific steps:
(1) pretreating the optical fiber to be processed;
firstly, cutting a section of single-mode optical fiber with the length of 40cm, wherein the diameter of a fiber core of the optical fiber is 9 mu m, and the diameter of a cladding of the optical fiber is 125 mu m; removing the optical fiber coating layer at the part to be processed by using optical fiber wire stripping pliers to expose the optical fiber coating layer in the air; and wiping and washing the optical fiber without the cladding by ethanol and deionized water in sequence to ensure that no coating layer is left on the surface of the optical fiber, and finally drying the deionized water on the surface of the optical fiber to finish the pretreatment of the single-mode optical fiber to be processed.
(2) Writing chirped grating in the optical fiber point by point through femtosecond laser;
firstly, fixing an optical fiber to be processed on a clamp of a three-dimensional mobile platform, and immersing the part of the optical fiber to be processed in mirror oil to eliminate the difference of the cylindrical section of the optical fiber; the femtosecond laser amplifier emits femtosecond laser with 515nm wavelength after frequency multiplication, the laser is focused on an optical fiber after passing through a frequency multiplication crystal, a beam expansion collimation system, a dichroic mirror, a reflecting mirror and an oil immersion objective lens, and the laser is focused at the center of an optical fiber core through CCD camera observation and three-dimensional moving platform adjustment; then, inputting a preset processing program in software, and processing the fiber bragg grating by adopting a point-by-point method; the pulse width of the femtosecond laser is 290fs, the single-pulse energy is set to 70nJ, and the repetition frequency is set to 400 Hz; in the scanning process, the three-dimensional moving platform is controlled to move along the axial direction of the optical fiber, the initial moving speed of the three-dimensional moving platform is 0.4281mm/s, the moving speed of the platform is uniformly accelerated, the moving speed of the three-dimensional platform reaches 0.4287mm/s after scanning is finished, the distance between the laser focusing grating points is gradually increased from 1.0703 mu m to 1.0718 mu m, the resonant wavelength of the chirped fiber grating is enabled to be near 1550nm, and a scanned grating microscope image is obtained and shown in figure 3; the objective lens used in the processing process is a 60X oil immersion objective lens, and the numerical aperture is 1.42; the transmission spectrum and the reflection spectrum of the chirped grating with the half-peak width of 2nm obtained by measurement of a spectrum analyzer are shown in the third drawing, and the group delay curve of the chirped grating with the half-peak width of 2nm obtained by measurement of an optical dispersion and loss analyzer is shown in the fourth drawing.
(3) Taking out and annealing the chirped fiber grating;
firstly, taking out the chirped grating manufactured by the femtosecond laser point-by-point direct writing method in the second step, wiping mirror oil on the surface of the optical fiber by cotton soaked by ethanol, then washing the optical fiber by deionized water, and finally drying the optical fiber; then, placing the washed fiber grating sample in a tube furnace for annealing, setting the annealing temperature to be 800 ℃, setting the temperature rise time to be 1h, the constant temperature time to be 2h and the temperature reduction time to be 1h, and taking out the fiber grating sample after the fiber grating sample is cooled to the room temperature; the thermal annealing method can release the residual stress of the fiber grating in the processing process, and optimizes the optical characteristics of the chirped fiber grating.
Example 2
The chirped fiber grating with the half-peak width of 12nm is prepared by using a femtosecond laser direct writing technology.
The processing system is shown in FIG. 1, and is the same as that of example 1.
A three-dimensional micromachining method of a hard and brittle material comprises the following specific steps:
(1) pretreating the optical fiber to be processed;
the same as in example 1.
(2) Writing chirped grating in the optical fiber point by point through femtosecond laser;
firstly, fixing an optical fiber to be processed on a clamp of a three-dimensional mobile platform, and immersing the part of the optical fiber to be processed in mirror oil to eliminate the difference of the cylindrical section of the optical fiber; the femtosecond laser amplifier emits femtosecond laser with 515nm wavelength after frequency multiplication, the laser is focused on an optical fiber after passing through a frequency multiplication crystal, a beam expansion collimation system, a dichroic mirror, a reflecting mirror and an oil immersion objective lens, and the laser is focused at the center of an optical fiber core through CCD camera observation and three-dimensional moving platform adjustment; then, inputting a preset processing program in software, and processing the fiber bragg grating by adopting a point-by-point method; the pulse width of the femtosecond laser is 290fs, the single-pulse energy is set to be 110nJ, and the repetition frequency is set to be 400 Hz; in the scanning process, the three-dimensional moving platform is controlled to move axially along the optical fiber, the initial moving speed of the three-dimensional moving platform is 0.4268mm/s, the moving speed of the platform is uniformly accelerated to reach 0.4303mm/s after the moving speed scanning of the three-dimensional platform is finished, the distance between laser focusing grating points is gradually increased to 1.0756 mu m from 1.0670 mu m, and the scanned grating microscope image is shown in figure two; the objective lens used in the processing process is a 60X oil immersion objective lens, and the numerical aperture is 1.42; the reflection spectrum and the group delay curve of the 12nm half-peak width chirped grating measured by a spectrum analyzer and an optical dispersion and loss analyzer are shown in the figure five.
(3) Taking out and annealing the chirped fiber grating;
the same as in example 1.
The traditional method for manufacturing the chirped fiber grating is a phase mask method, the phase mask method needs to prepare corresponding phase mask plates in advance to manufacture the chirped fiber grating with corresponding parameters, if different chirped fiber gratings need to be manufactured, the phase mask plates with different parameters need to be prepared in advance, and the work is time-consuming and labor-consuming undoubtedly. By utilizing the method, the required chirped fiber grating can be directly written by a femtosecond laser point-by-point method, and the parameters of the manufactured chirped fiber grating can be flexibly regulated and controlled by changing the processing program, so that the processing of the chirped fiber grating is not limited by a phase mask, and the method has the advantages of high processing efficiency, simplicity in operation, high flexibility and the like.
As can be seen from fig. 1, compared with the conventional phase mask method, the method of the present invention has a simpler manufacturing process, and does not require a phase mask plate with a complicated manufacturing method and a high price.
As can be seen from FIG. 3, the chirped fiber grating manufactured by the method of the present invention has good morphology and uniform variation of the laser focusing point spacing.
As can be seen from fig. 4, compared to the phase mask method, the chirped fiber grating prepared by the method of the present invention has a higher reflectivity, which is caused by the larger modulation of the refractive index in the fiber core by the femtosecond laser.
As can be seen from fig. 5, the chirped fiber grating manufactured by the method of the present invention has a good group delay curve and can meet the application requirements in the field of optical communications because the method of the present invention makes the period of the manufactured fiber grating vary uniformly.
As can be seen from fig. 6, since the method of the present invention greatly modulates the refractive index in the fiber core, the method of the present invention can manufacture chirped fiber gratings with a half-peak width of 12nm in a structure with a length of 1.74cm, and the chirp rate reaches 6.897nm/cm, which is much greater than that of chirped fiber gratings manufactured by a phase mask method and having a maximum chirp rate of about 3 nm/cm; and the group delay curve of the grating is good.
As can be seen from fig. 4 and 6, the chirped fiber grating with a half-peak width of 2nm to 12nm can be manufactured by the method of the present invention, and in the process of manufacturing the fiber grating, a phase mask with complicated manufacture and high price is not required, and the chirped fiber grating meeting the requirements can be manufactured by a design procedure, thereby embodying the advantages of flexibility and adjustability.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (8)
1. A method for preparing chirped fiber grating by using femtosecond laser direct writing technology is characterized by comprising the following specific steps:
the method comprises the following steps: pretreating an optical fiber to be processed;
firstly, intercepting a section of single mode fiber with a certain length, and removing an optical fiber coating layer at a part to be processed by using an optical fiber wire stripper to expose an optical fiber cladding in the air; wiping and washing the optical fiber without the cladding by ethanol and deionized water in sequence to ensure that no coating layer is left on the surface of the optical fiber, and finally drying the deionized water on the surface of the optical fiber to finish the pretreatment of the single-mode optical fiber to be processed;
step two: writing chirped grating in the optical fiber point by femtosecond laser;
firstly, fixing an optical fiber to be processed on a three-dimensional platform, and immersing a processing part in mirror oil to eliminate the difference of the cylindrical section of the optical fiber; the femtosecond laser amplifier emits femtosecond laser after frequency multiplication, the laser is focused in the optical fiber core after passing through a frequency multiplication crystal, a beam expanding collimation system, a dichroic mirror and an oil immersion objective, the laser focusing position can be observed through a CCD camera, and meanwhile, the laser focusing position can be changed by adjusting a three-dimensional platform; and then, inputting a preset processing program in software, controlling the three-dimensional platform to perform variable-speed motion, performing variable-speed scanning processing on the three-dimensional platform along the axial direction of the optical fiber, and changing the processing parameters to change the distance between the points of the laser focused in the fiber core with different amplitudes so as to manufacture the chirped fiber grating with different chirps.
Step three: taking out and annealing the chirped fiber grating;
firstly, taking out the chirped grating manufactured by the femtosecond laser point-by-point direct writing method in the second step, wiping mirror oil on the surface of the optical fiber by cotton soaked by ethanol, then washing the optical fiber by deionized water, and finally drying the optical fiber; and then, placing the washed fiber grating sample in a tube furnace, heating to 400-800 ℃, keeping the constant temperature for 1-3 hours, and taking out after the fiber grating sample is cooled to room temperature. The thermal annealing method can release the residual stress of the fiber grating in the processing process, and optimizes the optical characteristics of the chirped fiber grating.
2. The method for fabricating a chirped fiber grating according to claim 1, wherein the length of the single mode fiber cut in the step one is 20cm to 80 cm.
3. The method for fabricating a chirped fiber grating using a femtosecond laser direct writing technology according to claim 1, wherein the femtosecond laser source used in the second step is a high repetition frequency femtosecond laser system with a central wavelength of 1030nm composed of an oscillation stage and an amplification stage.
4. The method of claim 1, wherein the variable scanning process of step two has a start-end speed related to femtosecond laser pulse frequency, and the three-dimensional stage moving start speed is controlled to be 0.0427mm/s-4.2681mm/s, the end speed is controlled to be 0.0431mm/s-4.3032mm/s, and the acceleration is controlled to be 0.0002mm/s according to the difference of femtosecond laser pulse frequency2-2.1112mm/s2(ii) a The scanning mode is point-by-point scanning.
5. The method for preparing chirped fiber grating according to claim 1, wherein the variable speed scanning process is performed in the second step, the femtosecond laser repetition frequency is controlled to be 40Hz-4000Hz, and the single pulse energy is controlled to be 50nJ-150 nJ.
6. The method for preparing the chirped fiber grating by using the femtosecond laser direct writing technology according to the claim 1, wherein the three-dimensional platform used in the second step is composed of a three-dimensional manual platform and a three-dimensional electric control platform; the moving range of the X axis and the Y axis of the three-dimensional manual platform is 0-5cm, the moving range of the Z axis is 0-1cm, and the precision is 1 mu m; the Z axis and the X axis of the three-dimensional electric control platform are piezoelectric platforms, the moving range of the Z axis is 0-25 mu m, the precision is 1-10nm, the moving range of the X axis is 0-200 mu m, the precision is 1-10nm, the position of a laser focus is controlled by the Y axis through computer A3200Motion Composer software, the moving precision is 10-100nm, and the maximum moving length is 20 mu m.
7. The method for preparing a chirped fiber grating using the femtosecond laser direct writing technology according to claim 1, wherein the refractive index of the mirror oil used in the second step is 1.4-1.5.
8. The method for preparing the chirped fiber grating by using the femtosecond laser direct writing technology according to claim 1, wherein the tube furnace used in the step three is an open-type tube furnace; the upper temperature limit of the tube furnace is 1600 ℃ and the precision is +/-1 ℃.
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| CN113296185A (en) * | 2021-06-28 | 2021-08-24 | 中国工程物理研究院激光聚变研究中心 | Optical fiber with cascade structure grating and preparation method thereof |
| CN113427135A (en) * | 2021-06-25 | 2021-09-24 | 西安交通大学 | Device and method for processing optical fiber microstructure by femtosecond laser rotation |
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| CN114204389A (en) * | 2021-11-24 | 2022-03-18 | 四川橙科通信技术研究院有限责任公司 | Fiber grating string structure and preparation method thereof |
| CN114518620A (en) * | 2022-01-24 | 2022-05-20 | 江苏睿赛光电科技有限公司 | High-power fiber grating laser annealing system and method |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6072926A (en) * | 1995-05-16 | 2000-06-06 | Cole; Martin | Optical waveguide grating |
| CN106918866A (en) * | 2017-05-10 | 2017-07-04 | 深圳大学 | A kind of optical fiber Bragg chirped phase-shifted gratings and preparation method thereof and equipment |
| CN109683231A (en) * | 2019-01-07 | 2019-04-26 | 浙江工业大学 | Mechanical chirp long period optic fiber grating |
| CN211603608U (en) * | 2020-02-25 | 2020-09-29 | 江苏师范大学 | Femtosecond laser direct-writing fiber grating preparation device based on machine learning image recognition |
-
2021
- 2021-03-23 CN CN202110307931.6A patent/CN113009618A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6072926A (en) * | 1995-05-16 | 2000-06-06 | Cole; Martin | Optical waveguide grating |
| CN106918866A (en) * | 2017-05-10 | 2017-07-04 | 深圳大学 | A kind of optical fiber Bragg chirped phase-shifted gratings and preparation method thereof and equipment |
| CN109683231A (en) * | 2019-01-07 | 2019-04-26 | 浙江工业大学 | Mechanical chirp long period optic fiber grating |
| CN211603608U (en) * | 2020-02-25 | 2020-09-29 | 江苏师范大学 | Femtosecond laser direct-writing fiber grating preparation device based on machine learning image recognition |
Non-Patent Citations (2)
| Title |
|---|
| 明昕宇 等: ""飞秒激光刻写低温度灵敏度的细芯长周期光栅"", 《中国光学》 * |
| 郑钟铭 等: ""基于波片棱镜组合能量调节的切趾光纤光栅"", 《吉林大学学报（信息科学版）》 * |
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| CN113296185A (en) * | 2021-06-28 | 2021-08-24 | 中国工程物理研究院激光聚变研究中心 | Optical fiber with cascade structure grating and preparation method thereof |
| CN113655562A (en) * | 2021-08-11 | 2021-11-16 | 深圳市畅格光电有限公司 | Automatic feeding device for femtosecond laser writing fiber bragg grating and writing processing steps |
| CN114204389A (en) * | 2021-11-24 | 2022-03-18 | 四川橙科通信技术研究院有限责任公司 | Fiber grating string structure and preparation method thereof |
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