CN112649914A - Method for preparing tilted sapphire fiber grating based on femtosecond laser phase mask method - Google Patents
Method for preparing tilted sapphire fiber grating based on femtosecond laser phase mask method Download PDFInfo
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- CN112649914A CN112649914A CN201910954612.7A CN201910954612A CN112649914A CN 112649914 A CN112649914 A CN 112649914A CN 201910954612 A CN201910954612 A CN 201910954612A CN 112649914 A CN112649914 A CN 112649914A
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- sapphire
- optical fiber
- phase mask
- femtosecond laser
- fiber
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- 229910052594 sapphire Inorganic materials 0.000 title claims abstract description 67
- 239000010980 sapphire Substances 0.000 title claims abstract description 67
- 239000000835 fiber Substances 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000013307 optical fiber Substances 0.000 claims abstract description 44
- 238000006073 displacement reaction Methods 0.000 claims abstract description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 7
- 239000010936 titanium Substances 0.000 claims abstract description 7
- 238000001228 spectrum Methods 0.000 claims abstract description 5
- 238000000411 transmission spectrum Methods 0.000 claims abstract description 5
- 230000001427 coherent effect Effects 0.000 claims abstract description 4
- 239000013078 crystal Substances 0.000 claims description 4
- 238000010329 laser etching Methods 0.000 claims description 2
- 238000009529 body temperature measurement Methods 0.000 abstract description 9
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000010437 gem Substances 0.000 description 1
- 229910001751 gemstone Inorganic materials 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000005459 micromachining Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
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Classifications
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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
- G02B6/02133—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating using beam interference
- G02B6/02138—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating using beam interference based on illuminating a phase mask
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/02—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of crystals, e.g. rock-salt, semi-conductors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Laser Beam Processing (AREA)
- Diffracting Gratings Or Hologram Optical Elements (AREA)
Abstract
The invention discloses a method for preparing an inclined sapphire fiber grating based on a femtosecond laser phase mask method, which consists of a bracket (1), a titanium sapphire femtosecond laser (2), a beam expander (3), a phase mask plate (4), a three-dimensional six-axis displacement platform (5), a fiber clamp (6), a sapphire fiber (7), a broadband light source (8), a coupler (9) and a spectrometer (10); after passing through the beam expander (3), laser emitted by the titanium sapphire femtosecond laser (2) obliquely enters and passes through the phase mask plate (3), the range of the inclination angle is 2-25 degrees, the laser is coherent after passing through the phase mask plate (3), interference fringes with periodically distributed light intensity are generated in the sapphire optical fiber (7), and an inclined sapphire optical fiber grating is formed on the fiber core of the sapphire optical fiber; the sapphire optical fiber (7) is connected with one end of a coupler (9), a broadband light source (8) and a spectrometer (10) are connected with the other end of the coupler (9), and a transmission spectrum and a reflection spectrum are measured by the spectrometer (10). The invention can prepare the inclined sapphire fiber grating and increase the temperature measurement range and the high-temperature sensitivity in the field of high-temperature measurement.
Description
Technical Field
The invention belongs to the field of high-temperature measurement of sapphire optical fibers, and particularly relates to a method for preparing an inclined sapphire optical fiber grating based on a femtosecond laser phase mask method.
Background
With the research of femtosecond laser in the field of glass material micromachining, researchers begin to apply the femtosecond laser to the development of fiber gratings, and the working principle of the femtosecond laser is that femtosecond laser pulses are induced in optical fibers to obtain larger refractive index modulation by virtue of extremely short pulse width and extremely high peak power so as to form the fiber gratings. By utilizing the femtosecond laser phase mask method, hydrogen-carrying pretreatment of the optical fiber is not needed, and the coating layer of the optical fiber is not needed to be stripped, so that the prepared optical fiber grating has better processing flexibility and excellent high-temperature stability.
The common optical fiber temperature sensor has the characteristics of large dynamic range, high sensitivity, high response speed, strong anti-electromagnetic interference capability and the like, and the sapphire optical fiber sensor can realize temperature measurement with high temperature, high precision, high signal-to-noise ratio and high bandwidth on the basis of the advantages. Therefore, the sapphire becomes an important novel material in the field of optical fiber high-temperature measurement, the sapphire and the optical fiber are fused, on the basis of the phase mask technology, the femtosecond titanium sapphire laser is utilized to write the Bragg grating into the sapphire optical fiber, the sapphire optical fiber high-temperature sensor can be manufactured, and the temperature can be accurately measured in a high-temperature environment.
The inclined fiber Bragg grating (TFBG) is a special type of fiber grating with the wave vector direction of the grating deviated from the axial direction of the fiber, namely the grating plane inclined relative to the axial direction of the fiber, and has the dual sensing characteristics of FBG and LPFG. The inclined grating plane is realized by obliquely placing the optical fiber relative to the mask plate and adopting a light beam scanning exposure technology, and the formed grating structure has the typical high-temperature stability of femtosecond laser induced refractive index change.
Disclosure of Invention
Aiming at the application limitation of the prior art, the invention aims to provide a method for preparing an inclined sapphire fiber grating by taking a femtosecond laser phase mask method as a core, which can be applied to a sapphire fiber grating sensor to increase the temperature measurement range and high temperature sensitivity in the field of high temperature measurement.
The device is realized by the following technical scheme that the device consists of a support (1), a titanium-sapphire femtosecond laser (2), a beam expander (3), a phase mask plate (4), a three-dimensional six-axis displacement platform (5), an optical fiber clamp (6), a sapphire optical fiber (7), a broadband light source (8), a coupler (9) and a spectrometer (10); the support (1) is used for adjusting the positions of the titanium-sapphire femtosecond laser (2), the beam expander (3) and the phase mask plate (4) so that light beams can be transmitted along the same axis; the three-dimensional six-axis displacement platform (5) and the optical fiber clamp (6) are used for adjusting the three-dimensional space position of the sapphire optical fiber (7); laser emitted by the titanium sapphire femtosecond laser (2) is obliquely incident and passes through the phase mask plate (3) after the beam diameter is increased and the beam divergence angle is reduced by the beam expander (3), the range of the inclination angle is 2-25 degrees, and +/-1-level diffraction beams are coherent after the phase mask plate (3) to generate interference fringes with periodically distributed light intensity in the sapphire optical fiber (7) and form an inclined sapphire optical fiber grating on the core of the sapphire optical fiber; the sapphire fiber (7) is connected with one end of a coupler (9), a broadband light source (8) and a spectrometer (10) are connected with the other end of the coupler (9), and the transmission spectrum and the reflection spectrum of the inclined sapphire fiber grating are measured by the spectrometer (10).
The titanium gem femtosecond laser (2) is a supercontinuum light source, has multiple wavelength choices, can provide a large range of pulse lengths from femtosecond to picosecond, and has the average output power of 5W.
The three-dimensional six-axis displacement platform (5) is an XYZ-direction high-precision moving platform in a three-dimensional space.
The period of the phase mask plate (4) is Λ, the phase mask plate is used for performing phase modulation on incident beams to form diffraction, and energy is distributed to all levels of diffracted beams; the phase mask plate (3) is used for generating interference fringes with light intensity periodically distributed, and the fiber core of the sapphire optical fiber is exposed to etch the periodic refractive index modulation, so that the inclined sapphire optical fiber grating is formed; in the experiment, inclined sapphire fiber gratings with different angles can be prepared by adjusting the inclination angle theta.
The sapphire optical fiber (7) is a sapphire single crystal with uniform refraction, and a grating structure formed in the sapphire single crystal has typical high-temperature stability of femtosecond laser etching refractive index change.
The spectrometer (10) is used for measuring the intensity of spectral lines at different wavelength positions, Bragg resonance and cladding mode resonance formed in the sapphire optical fiber (7) can be simultaneously appeared in a transmission spectrum, and a reflection spectrum only contains the Bragg resonance.
The invention has the beneficial effects that: the design of the invention takes a femtosecond laser phase mask method as a core, provides a method for preparing the inclined sapphire fiber grating, increases the temperature measurement range and the high-temperature sensitivity in the field of sapphire fiber high-temperature measurement, has strong innovation and accuracy, can be applied to the preparation of sapphire high-temperature sensors, and has good application prospect.
Drawings
FIG. 1 is a front view of a system for fabricating a tilted sapphire fiber grating device.
FIG. 2 is a top view of a system for fabricating a tilted sapphire fiber grating device.
Detailed Description
As shown in fig. 1, the device comprises a support (1), a titanium-sapphire femtosecond laser (2), a beam expander (3), a phase mask plate (4), a three-dimensional six-axis displacement platform (5), an optical fiber clamp (6), a sapphire optical fiber (7), a broadband light source (8), a coupler (9) and a spectrometer (10); the support (1) is used for adjusting the positions of the titanium-sapphire femtosecond laser (2), the beam expander (3) and the phase mask plate (4) so that light beams can be transmitted along the same axis; the three-dimensional six-axis displacement platform (5) and the optical fiber clamp (6) are used for adjusting the three-dimensional space position of the sapphire optical fiber (7); the titanium sapphire femtosecond laser (2) emits laser with the pulse width of 30fs and the average power of 5W, the diameter of a light beam is increased through the beam expander (3), the divergence angle of the light beam is reduced, the laser is incident at an inclination angle of 10 degrees and penetrates through the phase mask plate (3), a +/-1-level diffraction light beam is used for being coherent after the phase mask plate (3), interference fringes with light intensity periodically distributed are generated in the sapphire optical fiber (7), and the fiber core of the sapphire optical fiber is exposed to be modulated by etching the periodic refractive index, so that the inclined sapphire optical fiber grating with the grating period of 750nm and the inclination angle of 10 degrees is formed; the sapphire optical fiber (7) is connected with one end of a coupler (9), a broadband light source (8) and a spectrometer (10) are connected with the other end, and the transmission spectrum and the reflection spectrum of the inclined sapphire optical fiber grating are measured by the spectrometer (10).
Claims (2)
1. The inclined sapphire fiber grating is prepared based on a femtosecond laser phase mask method, and is characterized in that: the device comprises a support (1), a titanium-sapphire femtosecond laser (2), a beam expander (3), a phase mask plate (4), a three-dimensional six-axis displacement platform (5), an optical fiber clamp (6), a sapphire optical fiber (7), a broadband light source (8), a coupler (9) and a spectrometer (10); the support (1) is used for adjusting the positions of the titanium-sapphire femtosecond laser (2), the beam expander (3) and the phase mask plate (4) so that light beams can be transmitted along the same axis; the three-dimensional six-axis displacement platform (5) and the optical fiber clamp (6) are used for adjusting the three-dimensional space position of the sapphire optical fiber (7); laser emitted by the titanium sapphire femtosecond laser (2) is obliquely incident and passes through the phase mask plate (3) after the beam diameter is increased and the beam divergence angle is reduced by the beam expander (3), the range of the inclination angle is 2-25 degrees, and +/-1-level diffraction beams are coherent after the phase mask plate (3) to generate interference fringes with periodically distributed light intensity in the sapphire optical fiber (7) and form an inclined sapphire optical fiber grating on the core of the sapphire optical fiber; the sapphire fiber (7) is connected with one end of a coupler (9), a broadband light source (8) and a spectrometer (10) are connected with the other end of the coupler (9), and the transmission spectrum and the reflection spectrum of the inclined sapphire fiber grating are measured by the spectrometer (10).
2. The femtosecond laser phase mask method-based inclined sapphire fiber grating prepared according to the claim 1 is characterized in that the sapphire fiber (7) is a sapphire single crystal with uniform refraction, and a grating structure formed in the sapphire single crystal has the typical high-temperature stability of femtosecond laser etching refractive index change.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910954612.7A CN112649914A (en) | 2019-10-09 | 2019-10-09 | Method for preparing tilted sapphire fiber grating based on femtosecond laser phase mask method |
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| CN201910954612.7A CN112649914A (en) | 2019-10-09 | 2019-10-09 | Method for preparing tilted sapphire fiber grating based on femtosecond laser phase mask method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113340854A (en) * | 2021-06-07 | 2021-09-03 | 西安石油大学 | Biochemical sensor based on reflection type inclined fiber grating probe and manufacturing method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108318963A (en) * | 2018-02-11 | 2018-07-24 | 西安交通大学 | A kind of parallel multi-angle oblique fiber bragg grating and preparation method thereof |
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2019
- 2019-10-09 CN CN201910954612.7A patent/CN112649914A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108318963A (en) * | 2018-02-11 | 2018-07-24 | 西安交通大学 | A kind of parallel multi-angle oblique fiber bragg grating and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 赵勇: "光纤光栅及其传感技术", 31 January 2007, 国防工业出版社, pages: 10 * |
| 马宏等: "《精密刻划与超精密特种加工技术》", 31 August 2008, 兵器工业出版社, pages: 210 - 211 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113340854A (en) * | 2021-06-07 | 2021-09-03 | 西安石油大学 | Biochemical sensor based on reflection type inclined fiber grating probe and manufacturing method |
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