CN114660705B - Method for writing optical fiber Bragg grating surface by surface based on high-refractive index matching liquid - Google Patents
Method for writing optical fiber Bragg grating surface by surface based on high-refractive index matching liquid Download PDFInfo
- Publication number
- CN114660705B CN114660705B CN202210297396.5A CN202210297396A CN114660705B CN 114660705 B CN114660705 B CN 114660705B CN 202210297396 A CN202210297396 A CN 202210297396A CN 114660705 B CN114660705 B CN 114660705B
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- grating
- inscribed
- refractive index
- index matching
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
Abstract
Setting repetition frequency and power parameters of femtosecond laser, and moving distance of a three-dimensional electric displacement table, namely length parameters and moving speed of the inscribed grating; selecting a section of area on the optical fiber as an optical fiber grating area to be inscribed, wiping the optical fiber grating area to be inscribed cleanly by alcohol, placing the optical fiber grating area to be inscribed on a glass slide, fixing two ends of the optical fiber by using an optical fiber clamp, immersing the optical fiber grating area to be inscribed on the glass slide by using an index matching liquid with the refractive index of more than 1.5, covering the glass slide, covering the index matching liquid and the optical fiber to form a plano-concave cylindrical lens, wherein the refractive index of the concave cylindrical lens is regulated by the index matching liquid; and starting the femtosecond laser, and writing the fiber grating surface by surface. The Bragg grating refractive index modulation area inscribed by the face-to-face method is more symmetrical in the distribution of the fiber cores, so that the grating loss can be reduced to a great extent, and the method has the advantages of simple structure, high working efficiency, low loss and wide applicability.
Description
Technical Field
The invention belongs to the technical field of grating manufacture, and particularly relates to a method for writing an optical fiber Bragg grating surface by surface based on a high-refractive index matching liquid 12.
Background
Femtosecond lasers have extremely narrow pulse width and extremely high peak power, and interact with materials mainly based on nonlinear effects such as multiphoton absorption, avalanche ionization and the like, and can be used for processing various materials, particularly processable transparent media. Therefore, the femtosecond laser has wide application in the field of fiber grating preparation.
The fiber bragg grating is widely applied to the fields of fiber lasers, fiber communication and fiber sensing. The fiber bragg grating has the advantages of low insertion loss, strong electromagnetic interference resistance, small volume, light weight, easiness in realizing wavelength division multiplexing and the like. The fiber bragg grating can be used as an optical fiber internal reflector to realize a laser with an all-fiber structure, has the advantages of compact structure, good stability and the like, and greatly promotes the development of the fiber laser. The advent of fiber gratings has prompted the development of fiber optic communications and fiber optic sensing.
The optical fiber grating writing method can be divided into two main types, namely an internal writing method and an external writing method. The internal writing method is to form interference standing waves in the photosensitive optical fiber by utilizing light beams to realize the periodic refractive index modulation along the axial direction of the optical fiber, and Hill et al prepare a first fiber bragg grating in the world by utilizing the internal writing method. The external writing method focuses laser from the side surface of the optical fiber to the fiber core to form a grating, wherein the grating comprises a holographic interference method, a phase mask plate method, a direct writing method and the like. The holographic interferometry has extremely high requirements on the stability of the double-beam interferometry device, thereby increasing the difficulty and cost of grating preparation. Compared with the phase mask plate method, the grating preparation technology is relatively mature, and all levels of diffraction light such as zero level and symmetrically distributed +/-1 level are generated after laser passes through the phase mask plate. The zero-order diffraction light is generally suppressed, and double-beam interference is generated by the + -1-order diffraction light with higher diffraction efficiency to form interference fringes, so that periodic refractive index modulation in the optical fiber is realized. However, the fiber grating manufactured by the phase mask method depends on the period of the phase mask, has poor flexibility and is expensive. The femtosecond laser direct writing method is to focus the femtosecond laser into the optical fiber by utilizing a micro objective lens and write the periodic structure of the grating one by precisely controlling the movement of the optical fiber.
At present, a plurality of methods for preparing the fiber grating by femtosecond laser direct writing are realized. The point-by-point direct writing method generally adopts a microscope objective lens with higher numerical aperture for focusing, and can induce the refractive index modulation area of the optical fiber to be smaller than 1 mu m, but the optical fiber has asymmetry in the transverse and longitudinal directions. Such localized asymmetric index modulation regions result in a grating that is fabricated with a strong birefringence effect and a large insertion loss. The line-by-line direct writing method adopts laser scanning optical fiber cores perpendicular to the axial direction of the optical fibers to prepare periodic structures of gratings one by one, reduces the polarization-related loss of the prepared FBG to a certain extent, and has larger insertion loss. The line-by-line method needs to draw the grating structures one by one, and the process is time-consuming, which is not beneficial to the large-scale manufacture of the fiber grating. There is therefore a need for improvement and advancement in the art.
Disclosure of Invention
The invention aims to overcome the defects of the traditional preparation method of the fiber bragg grating and provides a method for writing the fiber bragg grating based on the high-refractive index matching liquid 12 surface by surface, which has the advantages of reasonable design, high working efficiency, low loss and wide applicability.
The technical scheme adopted for solving the technical problems is as follows: a method for writing optical fiber Bragg grating based on high refractive index matching liquid surface by surface includes setting femto second laser on optical platform, setting optical switch, plane mirror reflection group, diaphragm, plane mirror, microlens and three-dimensional micro-processing platform on optical platform along laser emergent direction, setting CCD camera on microlens, setting three-dimensional right angle manual adjusting frame on three-dimensional electric displacement platform, setting glass slide and optical fiber clamp and LED lamp on three-dimensional right angle manual adjusting frame, setting LED lamp under glass slide, connecting CCD camera and three-dimensional electric displacement platform with computer, connecting one end of optical fiber to be written with broadband light source and another end with spectrum analyzer; the method comprises the following steps:
s1, setting parameters
Setting repetition frequency and power parameters of femtosecond laser, and setting the moving distance of a three-dimensional electric displacement table, namely the length parameters of a inscribed grating and the moving speed to 321.4 mu m/s;
s2, selecting a section of area on the optical fiber to be inscribed, stripping off a coating layer or taking the area with the coating layer as an optical fiber to be inscribed grating area, wiping the optical fiber to be inscribed grating area clean by alcohol, placing the optical fiber to be inscribed grating area on a glass slide, fixing two ends of the optical fiber by using an optical fiber clamp, immersing the optical fiber to be inscribed area on the glass slide by using an index matching liquid with the index of refraction of more than 1.5, covering the glass slide, forming a plano-concave cylindrical lens by using the index matching liquid and the optical fiber, and regulating the index of refraction of the plano-concave cylindrical lens formed by the index matching liquid;
s3, adjusting the initial state of the optical fiber to be inscribed by adjusting the three-dimensional right-angle manual adjusting frame, namely clearly distinguishing the fiber core of the optical fiber in the microlens, so that the femtosecond laser is aligned to the fiber core in the grating inscribing process;
s4, writing fiber grating face by face
And (3) starting the femtosecond laser, controlling the three-dimensional electric displacement platform through a computer after the power of the femtosecond laser is stable, enabling the three-dimensional electric displacement platform to move along the axial direction of the optical fiber, starting light to write the optical fiber Bragg grating one by one, detecting the spectrum of the written optical fiber grating in real time through a spectrum analyzer, then closing the optical switch and the three-dimensional electric displacement platform, taking out the written optical fiber grating and wiping cleanly.
As a preferable embodiment, in the step S1, the repetition rate of the femtosecond laser is set to 200 Hz and the power is set to 0.9 to 6 μw; the moving distance of the three-dimensional electric displacement table 17, that is, the length of the written grating is set to 100 to 6000 μm.
As a preferable technical solution, the refractive index adjustment range of the plano-concave cylindrical lens in the step S2 is 1.51-1.78.
The beneficial effects of the invention are as follows:
(1) The refractive index modulation area of the Bragg grating inscribed by the face-to-face method is more symmetrical in the distribution of the fiber core than that of the Bragg grating inscribed by the point-to-point method in the prior art, so that the polarization-related loss and the insertion loss of the grating can be greatly reduced;
(2) The Bragg grating refractive index modulation area inscribed by the face-to-face method is more uniformly distributed in the fiber core, so that the Bragg grating inscribed by the point-to-point method in the prior art is prevented from forming a local chemical fiber core refractive index modulation area, and response of a cladding mode can be restrained;
(3) The method for inscribing the grating by adopting the face-to-face method can realize the control of the shape and the size of the grating refractive index modulation region by controlling the different refractive indexes of the refractive index matching liquid and the pulse energy of the femtosecond laser.
(4) The method for inscribing the grating by adopting the face-to-face method can also realize inscription of fiber gratings with various complex structures such as chirped gratings by regulating the depth and width covered by the fiber refractive index changing structure and the refractive index changing size and the grating period.
(5) The method for preparing the Bragg grating by the surface-by-surface method is simple and convenient, can realize surface-by-surface inscription in various different types of optical fibers, and is a universal surface-by-surface inscription method for the Bragg grating.
(6) The invention can realize the surface-to-surface writing of the Bragg grating without removing the coating layer optical fiber, and improves the mechanical property of the grating.
Drawings
FIG. 1 is a schematic diagram of a device for writing fiber Bragg gratings face by face based on a high index matching fluid according to the present invention.
Fig. 2 is a schematic structural view of the three-dimensional micro-machining platform 8 in fig. 1.
FIG. 3 is a spectral diagram of a written fiber grating in a face-by-face manner.
Fig. 4 is a schematic illustration of a surface-by-surface written grating under a different high index matching fluid 12.
Fig. 5 is a graph of a grating micrograph and a spectral contrast plot of a point-by-point inscription with a refractive index of 1.45 and a face-by-face inscription with a refractive index of 1.7.
Fig. 6 is a graph of ultra-short gratings written in a face-by-face manner.
Wherein: a femtosecond laser 1; an optical switch 2; a plane mirror reflection group 3; a diaphragm 4; a CCD camera 5; a plane mirror 6; a microlens 7; a three-dimensional micromachining platform 8; a computer 9; a broadband light source 10; a spectrometer 11; a high refractive index matching fluid 12; the optical fiber 13 to be inscribed; a fiber clamp 14; an LED lamp 15; three-dimensional right angle manual adjustment rack 16; a three-dimensional electric displacement table 17; an optical stage 18.
Description of the embodiments
The present invention will be described in further detail with reference to the drawings and examples, but the present invention is not limited to the following embodiments.
Examples
In fig. 1 and 2, the device for writing the fiber bragg grating surface by surface based on the high-refractive index matching liquid in the embodiment is that a femtosecond laser 1 is arranged on an optical platform 18, a light switch 2, a plane mirror reflection group 3, a diaphragm 4, a plane mirror 6, a micro lens 7 and a three-dimensional micro-processing platform 8 are arranged on the optical platform 18 along the laser emergent direction, a CCD camera 5 is arranged on the micro lens 7, the CCD camera 5 is used for monitoring the grating writing process in real time, a three-dimensional electric displacement platform 17 is provided with a three-dimensional right angle manual adjusting frame 16, a glass slide, a fiber clamp 14 and an LED lamp 15 are arranged on the three-dimensional right angle manual adjusting frame 16, the LED lamp 15 is positioned below the glass slide, the fiber clamp clamps hold a fiber 13 to be written, the writing area of the fiber 13 is positioned on the glass slide, the refractive index matching liquid is dripped on the glass slide, the refractive index matching liquid is enabled to be completely immersed in the writing area of the fiber 13, the CCD camera 5 and the three-dimensional electric displacement platform 17 are connected with a computer 9, an image acquired by the CCD camera 5 is simultaneously, the three-dimensional electric displacement platform 9 is connected with the optical fiber 13 through the three-dimensional electric displacement platform 10, and the optical fiber is connected with one end of the optical spectrometer 10 in a spectral analyzer through the three-dimensional electric displacement device, and the spectral analyzer is connected with one end of the optical spectrometer is used for monitoring the spectral analyzer in real time.
The method for writing the fiber Bragg grating surface by surface based on the high-refractive index matching liquid in the embodiment comprises the following steps:
s1, setting parameters
The repetition frequency of the femtosecond laser is set to 200 Hz, the power is set to 0.9-6 mu W, the moving distance of the three-dimensional electric displacement table 17, namely the length of the inscribed grating is 100-6000 mu m, and the moving speed is 321.4 mu m/s;
s2, selecting a section of area on the optical fiber, stripping a coating layer or taking the coating layer as an optical fiber grating area to be inscribed, wiping the optical fiber grating area to be inscribed cleanly by alcohol, placing the optical fiber grating area to be inscribed on a glass slide, fixing two ends of the optical fiber by an optical fiber clamp 14, immersing the optical fiber grating area to be inscribed on the glass slide by using an index matching liquid with the refractive index of more than 1.5, covering a cover glass, and forming a plano-concave cylindrical lens by the index matching liquid and the optical fiber, thereby realizing beam shaping, enabling the focal length volume to be wider in the space of the transverse direction of the optical fiber, enabling different index matching liquids to be equivalent to plano-concave cylindrical lenses with different refractive power, enabling the focal length volume of light spots to have different beam expansion sizes in the transverse direction of the optical fiber, adjusting the refractive index of the plano-concave cylindrical lens by the index matching liquid, and adjusting the refractive index of the plano-concave cylindrical lens to be 1.51-1.78;
in the embodiment, the refractive index matching liquids with refractive indexes of 1.50, 1.60 and 1.70 are selected, and the femtosecond laser can form light spots with different sizes through the different sizes of transverse beam expansion of the optical fiber by the refractive index matching liquids, as shown in fig. 3;
s3, adjusting the initial state of the optical fiber 13 to be inscribed by adjusting the three-dimensional right-angle manual adjusting frame 16, namely clearly distinguishing the fiber core under the microlens 7, so that the femtosecond laser is aligned to the fiber core in the grating inscription process;
s4, writing fiber grating face by face
The femtosecond laser 1 is started, the three-dimensional electric displacement table 17 is controlled by the computer 9 after the power of the femtosecond laser 1 is stable, the three-dimensional electric displacement table 17 moves along the optical fiber axial direction, the optical fiber Bragg grating can be written one by opening light, the micro-morphology of the grating written one by one is recorded by utilizing the microlens 7 and the CCD camera 5, the spectrum of the written optical fiber grating is detected in real time by utilizing the spectrum analyzer, as shown in fig. 4, then the optical switch 2 and the three-dimensional electric displacement table 17 are closed, the writing is finished, the written optical fiber grating is taken out and wiped cleanly.
In order to verify the beneficial effects of the invention, the inventor writes the grating by using the refractive index matching liquid femtosecond laser point-by-point method based on the refractive index of 1.45 in the prior art and writes the grating by using the refractive index matching liquid surface-by-surface method based on the refractive index of 1.7 in the invention, wherein the repetition frequency of the femtosecond laser is 200 Hz, the power is 1 mu W, and the length of the written grating is 3mm; a grating micrograph and a spectral contrast are formed as in fig. 5.
The mode of writing the grating in the index matching liquid with the refractive index of 1.45 is point-by-point writing, so that the surface-by-surface writing cannot be realized, and the diameter D of the grating index modulation area is about 1 mu m. In contrast, surface-by-surface writing of gratings can be achieved in an index matching fluid with an index of refraction of 1.70, with the grating refractive modulation region diameter D increasing to 8 μm in the lateral direction. The method can obtain that the insertion loss and the short wave loss of the grating written by adopting the point-by-point method are respectively-0.71 dB and-3.09 dB under the same grating transmission depth (about-17.1 dB), and the insertion loss and the short wave loss of the grating written in the 1.70 refractive index matching liquid can be reduced to-0.21 dB and-0.87 dB, compared with the method for writing the fiber Bragg grating by the high refractive index matching liquid surface by surface based on the invention in the prior art, the loss is low.
Examples
The embodiment provides a method for writing ultra-short gratings and ultra-short grating pairs face by face based on high-refractive index matching liquid, wherein the repetition frequency of a laser is 200 Hz, the power is 6 mu W, a femtosecond laser 1 is started, a computer 9 is used for controlling a three-dimensional electric displacement table 17 after the power of the laser is stable, the three-dimensional electric displacement table 17 is enabled to move along the axial direction of an optical fiber, the grating length is set to be 100 mu m, after one ultra-short grating is written, the three-dimensional electric displacement table 17 is controlled to move along the optical fiber for 3000 mu m, and a second ultra-short grating with the length of 100 mu m is written; and then the optical switch 2 and the three-dimensional electric displacement table 17 are closed, the writing is finished, and the written fiber grating is taken out. Other operation steps were the same as in example 1.
The ultra-short grating pair inscription is completed, the two gratings can form an intrinsic F-P interference cavity, the ultra-short grating pair inscribed by the method has excellent coherence property, and the extinction ratio can reach more than 15 dB, as shown in figure 6.
Claims (3)
1. A method for writing an optical fiber Bragg grating surface by surface based on a high-refractive index matching liquid is characterized by comprising the following steps: the device applied by the method is that a femtosecond laser (1) is arranged on an optical platform (18), an optical switch (2), a plane mirror reflection group (3), a diaphragm (4), a plane mirror (6), a micro lens (7) and a three-dimensional micro processing platform (8) are arranged on the optical platform (18) along the laser emergent direction, a CCD camera (5) is arranged on the micro lens (7), a three-dimensional right angle manual adjusting frame (16) is arranged on the three-dimensional micro processing platform (8) which is a three-dimensional electric displacement platform (17), a glass slide, an optical fiber clamp (14) and an LED lamp (15) are arranged on the three-dimensional right angle manual adjusting frame (16), the LED lamp (15) is positioned below the glass slide, the CCD camera (5) and the three-dimensional electric displacement platform (17) are connected with a computer (9), one end of an optical fiber (13) to be inscribed is connected with a broadband light source (10), and the other end of the optical fiber is connected with a spectrum analyzer (11); the method comprises the following steps:
s1, setting parameters
Setting repetition frequency and power parameters of femto-second laser, and setting the moving distance of a three-dimensional electric displacement table (17), namely the length parameters and moving speed of a inscribed grating, wherein the moving speed is 321.4 mu m/s;
s2, selecting a section of area on the optical fiber (13) to be inscribed, stripping off a coating layer or taking the coating layer as an optical fiber grating area to be inscribed, wiping the optical fiber grating area to be inscribed with alcohol, placing the optical fiber grating area to be inscribed on a glass slide, fixing two ends of the optical fiber by an optical fiber clamp (14), immersing the optical fiber grating area to be inscribed on the glass slide by using an index matching liquid with the index of refraction being more than 1.5, covering the glass slide, covering the index matching liquid and the optical fiber to form a plano-concave cylindrical lens, and regulating the index of refraction of the plano-concave cylindrical lens formed by the index matching liquid;
s3, adjusting an initial state of the optical fiber (13) to be inscribed by adjusting the three-dimensional right-angle manual adjusting frame (16), namely clearly distinguishing an optical fiber core under the microlens (7), so that femtosecond laser is aligned to the optical fiber core in the grating inscription process;
s4, writing fiber grating face by face
The method comprises the steps of starting a femtosecond laser (1), controlling a three-dimensional electric displacement table (17) through a computer (9) after the power of the femtosecond laser (1) is stable, enabling the three-dimensional electric displacement table (17) to move along the axial direction of an optical fiber, starting a light beam (2) to write an optical fiber Bragg grating one by one, detecting the spectrum of the written optical fiber grating in real time through a spectrum analyzer (11), then closing the light switch (2) and the three-dimensional electric displacement table (17), taking out the written optical fiber grating and wiping the same.
2. The method for writing the fiber bragg grating surface by surface based on the high-refractive index matching liquid as claimed in claim 1, wherein the method comprises the following steps: in the step S1, the repetition frequency of the femtosecond laser is set to be 200 Hz, and the power is set to be 0.9-6 mu W; the moving distance of the three-dimensional electric displacement table (17), namely the length of the inscribed grating, is set to be 100-6000 mu m.
3. The method for writing the fiber bragg grating surface by surface based on the high-refractive index matching liquid as claimed in claim 1, wherein the method comprises the following steps: the refractive index adjusting range of the plano-concave cylindrical lens in the step S2 is 1.51-1.78.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210297396.5A CN114660705B (en) | 2022-03-24 | 2022-03-24 | Method for writing optical fiber Bragg grating surface by surface based on high-refractive index matching liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210297396.5A CN114660705B (en) | 2022-03-24 | 2022-03-24 | Method for writing optical fiber Bragg grating surface by surface based on high-refractive index matching liquid |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114660705A CN114660705A (en) | 2022-06-24 |
| CN114660705B true CN114660705B (en) | 2023-05-23 |
Family
ID=82030720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210297396.5A Active CN114660705B (en) | 2022-03-24 | 2022-03-24 | Method for writing optical fiber Bragg grating surface by surface based on high-refractive index matching liquid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114660705B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110883433A (en) * | 2019-11-20 | 2020-03-17 | 清华大学 | Micro-channel processing system based on liquid-assisted femtosecond laser on-line etching |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100334799B1 (en) * | 1999-07-07 | 2002-05-02 | 윤종용 | Apparatus and method for fabricating fiber grating |
| CN109000693A (en) * | 2018-08-06 | 2018-12-14 | 上海大学 | A kind of Intrinsical Fabry-Perot device preparation method of index-matching fluid and glass slide package |
| CN111175885A (en) * | 2020-02-25 | 2020-05-19 | 江苏师范大学 | Femtosecond laser direct-writing fiber grating preparation device and preparation method based on machine learning image recognition |
| CN111552022B (en) * | 2020-03-29 | 2022-04-19 | 桂林电子科技大学 | Grating inscription technology suitable for optical fiber core in any shape and distribution |
| CN112068238A (en) * | 2020-09-07 | 2020-12-11 | 桂林电子科技大学 | Single stress element optical fiber chirped fiber Bragg grating and preparation method thereof |
| CN113311525A (en) * | 2021-05-17 | 2021-08-27 | 华侨大学 | Phase-shift fiber Bragg grating preparation method based on femtosecond laser direct writing system |
| CN113900176B (en) * | 2021-12-10 | 2022-05-24 | 之江实验室 | Immersed multi-core fiber grating inscribing device |
-
2022
- 2022-03-24 CN CN202210297396.5A patent/CN114660705B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110883433A (en) * | 2019-11-20 | 2020-03-17 | 清华大学 | Micro-channel processing system based on liquid-assisted femtosecond laser on-line etching |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114660705A (en) | 2022-06-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Thomas et al. | Femtosecond pulse written fiber gratings: a new avenue to integrated fiber technology | |
| Lindenmann et al. | Connecting silicon photonic circuits to multicore fibers by photonic wire bonding | |
| CA2652823C (en) | Optical devices and digital laser method for writing waveguides, gratings, and integrated optical circuits | |
| CN111552022B (en) | Grating inscription technology suitable for optical fiber core in any shape and distribution | |
| AU2017319799A1 (en) | Femtosecond laser inscription | |
| KR20020038707A (en) | Direct writing of optical devices in silica-based glass using femtosecond pulse lasers | |
| CN102053301A (en) | Method for manufacturing sampling fiber grating | |
| US10845533B2 (en) | Writing of high mechanical strength fiber bragg gratings using ultrafast pulses and a phase mask | |
| CN203275699U (en) | Bandwidth-controllable fiber grating inscription device | |
| CN104765099A (en) | Device and method for inscribing fiber period adjustable fiber grating | |
| CN208172292U (en) | Long-period fiber grating preparation facilities | |
| CN103308977A (en) | Bandwidth-controllable fiber grating inscription method and device | |
| AU2020100905A4 (en) | A FBG writing system and method for any shaped and distribution of optical fiber cores | |
| CN103543490A (en) | Long-period fiber grating manufacturing method based on ink-jet printing technology | |
| CN111552023B (en) | System and method for preparing special-shaped core fiber grating based on semi-circle phase compensation plate | |
| CN212872967U (en) | Apodization long period optical fiber grating inscribing device | |
| CN102830464A (en) | Double-filtering microstructure beam splitter based on single mode-multimode fiber bragg grating | |
| CN116184559A (en) | Femtosecond laser core selection grating engraving device and method for multi-core fiber Bragg grating | |
| CN107247310A (en) | A kind of optical fiber F P wave filters and preparation method thereof | |
| CN102620679B (en) | Optical fiber Bragg grating vector bending sensor and preparation method thereof | |
| CN114660705B (en) | Method for writing optical fiber Bragg grating surface by surface based on high-refractive index matching liquid | |
| CN108318963B (en) | Parallel multi-angle inclined fiber Bragg grating and preparation method thereof | |
| CN107855644A (en) | A kind of laser processing device and system | |
| Grenier et al. | Optical circuits in fiber cladding: Femtosecond laser-written bragg grating waveguides | |
| CN112925056B (en) | II type long period optical fiber grating for inhibiting high order resonance and scattering loss |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |