CN113671621B - Linear movable fiber bragg grating continuous inscription system and method - Google Patents
Linear movable fiber bragg grating continuous inscription system and method Download PDFInfo
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- CN113671621B CN113671621B CN202110973401.5A CN202110973401A CN113671621B CN 113671621 B CN113671621 B CN 113671621B CN 202110973401 A CN202110973401 A CN 202110973401A CN 113671621 B CN113671621 B CN 113671621B
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- 239000000835 fiber Substances 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000013307 optical fiber Substances 0.000 claims abstract description 95
- 230000003287 optical effect Effects 0.000 claims abstract description 42
- 238000006073 displacement reaction Methods 0.000 claims abstract description 24
- 238000003466 welding Methods 0.000 claims abstract description 5
- 230000008569 process Effects 0.000 claims description 6
- 238000000411 transmission spectrum Methods 0.000 claims description 6
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- 238000012544 monitoring process Methods 0.000 claims description 3
- 238000002310 reflectometry Methods 0.000 claims description 3
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- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
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- XKRFYHLGVUSROY-UHFFFAOYSA-N argon Substances [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 1
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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
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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
- G02B6/02152—Refractive index modulation gratings, e.g. Bragg gratings characterised by the method of manufacture of the grating involving moving the fibre or a manufacturing element, stretching of the fibre
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Abstract
The invention belongs to the technical field of fiber bragg gratings, and discloses a system and a method for continuously inscribing a linear movable fiber bragg grating, wherein the system comprises an ultraviolet laser, an optical guide rail, a first linear displacement platform, a broadband light source, a photosensitive optical fiber, a circulator, a spectrometer, a computer and a second linear displacement platform; a reflecting mirror, a first diaphragm, a second diaphragm, a beam expander, a cylindrical lens and a phase mask plate are sequentially arranged on the optical guide rail; the second linear displacement platform is provided with a first optical fiber clamp and a second optical fiber clamp in sequence, and the first optical fiber clamp and the second optical fiber clamp are used for clamping and fixing photosensitive optical fibers. The beneficial effects of the invention are as follows: the linear moving platform is combined with the fiber bragg grating inscription, so that the fiber bragg grating array without the welding spot serial connection can be inscribed continuously on the same fiber.
Description
Technical Field
The invention belongs to the technical field of fiber gratings, and particularly relates to a system and a method for continuously inscribing a linear movable fiber grating.
Background
Fiber Bragg gratings are a key device widely used in the fields of fiber communication and fiber sensing.
Since Hill et al in the Canadian communication research center in 1978 inscribe the first fiber grating, the fiber grating has been widely applied in the fields of optical communication, optical sensing, lasers and the like, has great application value, and is a core component for realizing multiple functions such as longitudinal mode, polarization, transverse mode and the like mode selection, environment sensing, filtering, dispersion management and the like. Particularly, with the rise of fiber lasers in recent years, fiber gratings have also been greatly demanded in the market as key elements necessary for realizing all-fiber lasers.
Through the development for many years, researchers develop various fiber grating inscription methods, and from the view of using a light source, the lasers mainly comprise 193nm and 248nm medium ultraviolet excimer lasers, 308nm and 334nm near ultraviolet lasers, 400nm and 800nm femtosecond lasers, 488nm argon ion lasers and 10.6 mu m CO2 lasers; from the writing technology, there are mainly internal writing, holographic interference, wave-front interference, static/scanning phase mask, in-line grating, direct writing, etc.
Research on fiber gratings, including inscription technology, grating types, characteristics, applications, and the like, has been conducted from the end of the 20 th century by Shanghai optical machine institute (hereinafter referred to as "optical machine institute") and Nanjing polymeric optical and electrical technology limited company (hereinafter referred to as "polymeric optical and electrical technology"). The optical fiber grating inscription platform with good portability, reliability and inscription performance is developed based on technology accumulation of the optical machine in the field of the optical machine in the poly department for nearly 20 years.
However, most of optical path inscription built by the fiber grating inscription platform at present can only carry out inscription once and cannot carry out automatic multi-section continuous inscription.
Disclosure of Invention
Aiming at the problem that only single inscription can be carried out when the optical path inscribing is carried out on the optical fiber grating inscribing platform, the invention provides a system and a method for continuously inscribing a linear movable optical fiber grating.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a linear movable fiber bragg grating continuous inscription system comprises an ultraviolet laser (1), an optical guide rail (2), a first linear displacement platform (3), a broadband light source (10), a photosensitive fiber (13), a circulator (14), a spectrometer (15), a computer (17) and a second linear displacement platform (16); a reflecting mirror (4), a first diaphragm (5), a second diaphragm (6), a beam expander (7), a cylindrical lens (8) and a phase mask plate (9) are sequentially arranged on the optical guide rail; the second linear displacement platform (16) is sequentially provided with a first optical fiber clamp (11) and a second optical fiber clamp (12), and the first optical fiber clamp (11) and the second optical fiber clamp (12) are used for clamping and fixing the photosensitive optical fiber (13);
the optical guide rail (2) is arranged on the first linear moving platform (3), the first linear moving platform (3) and the second linear moving platform (16) are respectively connected with a computer (17), and the computer (17) is used for controlling the moving speed and the moving mode of the optical guide rail (2), the first optical fiber clamp (11) and the second optical fiber clamp (12);
the reflector (4), the first diaphragm (5), the second diaphragm (6), the beam expander (7), the cylindrical lens (8) and the phase mask plate (9) can synchronously move along with the optical guide rail (2) on the first linear moving platform (3) according to the speed and the mode set by the computer (17);
the reflecting mirror (4) is used for changing the track of the ultraviolet laser and ensuring that the ultraviolet laser beam emitted by the ultraviolet laser (1) is positioned at the central lines of the first diaphragm (5), the second diaphragm (6), the beam expander (7), the cylindrical lens (8) and the phase mask plate (9);
the circulator (14) is respectively connected with the broadband light source (10), the spectrometer (15) and the photosensitive optical fiber (13) and is used for changing the direction of a reflected light signal so as to facilitate signal acquisition of the spectrometer (15).
Further, the first linear moving platform (3) is arranged in parallel with the second linear moving platform (16); the optical guide rail (2) is vertically arranged on the first linear moving platform (3) and is arranged between the two platforms; the photosensitive optical fiber (13) is clamped on a second linear moving platform (16) and is arranged in a vertical direction with the optical guide rail (2).
Further, the ultraviolet laser (1) provides ultraviolet laser output, and the central wavelength of the output ultraviolet laser is 193nm, 244nm, 248nm or 308nm; the repetition frequency of the ultraviolet laser (1) is set to be 10-40 HZ, the high-voltage module is set to be 18-22KV, the single pulse energy is set to be 80-150mJ, and the pulse number is set to be 2000-10000.
Further, the first diaphragm (5) is a transverse rectangular diaphragm, and the second diaphragm (6) is a longitudinal rectangular diaphragm; the two are used for selecting and limiting the ultraviolet laser beam passing through the reflecting mirror (4) so as to realize the purpose of adjusting the position, the shape and the size of the ultraviolet laser beam, and the 8X 5mm rectangular light spot is obtained, and the unevenness of the light spot is less than 5%.
Further, the beam expander (7) is used for expanding the ultraviolet laser beam spots passing through the first diaphragm (5) and the second diaphragm (6), and can expand the beam size by 2-4 times.
Further, the cylindrical lens (8) is a plano-convex positive cylindrical lens, has the length of 70mm, the width of 15mm, the focal length of 30mm and the curvature radius of 15mm, and is used for converging the ultraviolet laser beams from the beam expander (7) to obtain beams with specific shapes.
Further, the mask area of the phase mask plate (9) can be 10mm×10mm, 15mm×10mm or 20mm×10mm, the period can be 362nm, 446nm, 528nm or 681nm, the phase mask plate is used for dividing an incident ultraviolet laser beam passing through the cylindrical lens (8) into two +1-level and-1-level diffraction beams with equal optical power, the two laser interference forms bright-dark alternate stripes, the bright-dark alternate stripes act on the photosensitive optical fiber (13) to expose to form a corresponding period fiber grating, and the distance between the photosensitive optical fiber (13) and the phase mask plate (9) is 3-10 mm.
Further, the broadband light source (10) is connected with the photosensitive optical fiber (13), the broadband signal light with the wavelength range of 1000 nm-2400 nm is output, and the tail fiber joint at the output end can be SC, FC, LC or ST; the first optical fiber clamp (11) and the second optical fiber clamp (12) are used for clamping and fixing the photosensitive optical fiber (13), and the space between the first optical fiber clamp and the second optical fiber clamp is 1000mm; the spectrometer (15) has a wavelength range of 1200-2400 nm and a wavelength precision of + -0.05 nm, and is used for monitoring the reflection and transmission spectrum conditions in the grating inscription process in real time.
Further, the second linear displacement stage (16) is capable of independently controlling the first and second optical fiber clamps (11, 12) located thereon, respectively, to provide a force in a horizontal direction, the magnitude of which is regulated by the computer (17). The center wavelength of the inscribed fiber grating is changed by adjusting the force of the first fiber clamp (11) and the second fiber clamp (12) in the horizontal direction of the fiber.
Further, the second linear displacement platform (16) is a one-dimensional motor displacement platform; the linear platform travel adopted by the first linear moving platform (3) and the second linear moving platform (16) is 1000mm, the resolution of an encoder is 50nm, the maximum speed is 100mm/s, the load capacity reaches 100kg, and the advancing speed and the moving mode of the first linear moving platform (3) and the second linear moving platform (16) are set through a computer (17).
A method for continuously inscribing a linear movable fiber grating, which utilizes the inscribing system, comprises the following steps:
removing a coating layer on the surface of the photosensitive optical fiber (13), wiping the surface of the photosensitive optical fiber (13) with alcohol cotton to remove the coating layer, placing the treated photosensitive optical fiber (13) on a second linear moving platform (16) in a continuous writing system, and clamping and fixing the photosensitive optical fiber by a first optical fiber clamp (11) and a second optical fiber clamp (12);
setting the repetition frequency of the ultraviolet laser (1) to be 10-40 Hz, setting the high-voltage module to be 18-22KV, setting the single pulse energy to be 80-150mJ, and directly incidence the ultraviolet laser beam with the center wavelength of 193nm, 244nm, 248nm or 308nm emitted by the ultraviolet laser (1) on the reflector (4) on the optical guide rail (2) after the ultraviolet laser is started;
after being reflected by the reflecting mirror (4), the ultraviolet laser sequentially passes through the first diaphragm (5) and the second diaphragm (6) for selection and shaping to obtain rectangular light spots with the dimensions of 8 multiplied by 5mm and the non-uniformity of less than 5%; the rectangular light spots are further sequentially incident to a cylindrical lens (8) and a phase mask plate (9) after the beam size is enlarged by 2-4 times through a beam expander (7) to obtain +1-level and-1-level diffraction beams, and the two beams of laser interference form light-dark alternate fringes to act on a photosensitive optical fiber (13);
the reflection and transmission spectrum conditions of signal light emitted by the broadband light source (10) through the photosensitive optical fiber (13) are monitored in real time through the spectrometer (15) until the number of ultraviolet laser pulses is 2000-10000 and the time is 40-120 s, so that the fiber bragg grating with the reflectivity of 10-99% and the period of 362nm, 446nm, 528nm or 681nm is obtained;
a computer (17) is used for controlling a second optical fiber clamp (12) on a second linear displacement platform (16) to move rightwards for 5N force to the photosensitive optical fiber (1), an optical guide rail (2) on a first linear movement platform (3) moves on the first linear movement platform (3) for 1-3 s at a speed of 20-100 mm/s, a reflecting mirror (4), a first diaphragm (5), a second diaphragm (6), a beam expander (7), a cylindrical lens (8) and a phase mask plate (9) move on the first linear movement platform (3) along with the optical guide rail (2) for 60-100 mm, then the photosensitive optical fiber stays at the position for 40-120 s, and the steps are repeated to obtain a second optical fiber grating;
and repeating the steps, and finally, continuously inscribing the fiber bragg grating array without the welding spots on the same photosensitive fiber (13).
Compared with the prior art, the invention provides a system and a method for continuously inscribing a linear movable fiber grating, which have the following beneficial effects:
(1) The system can combine the linear moving platform with the fiber grating inscription through the linear moving platform controlled by the computer program, and can inscribe the fiber grating array without welding spot serial connection on the same fiber continuously;
(2) The movable optical path inscribing system inscribes the optical fiber areas with the coating removed in different areas, so that continuous and multi-section optical fiber inscribing is realized;
(3) The system can move the second optical fiber clamp through the one-dimensional motor displacement platform controlled by the computer program, and apply corresponding axial stress so as to change the center wavelength of the optical fiber grating.
Drawings
FIG. 1 is a schematic diagram of a linear movable fiber grating writing system according to the present invention;
FIG. 2 is a graph of reflection spectra of fiber Bragg gratings (Fiber Bragg Grating abbreviated as FBGs) of different center wavelengths fabricated using a linearly movable grating inscription system of the present invention.
The meaning of the reference numerals in the figures is: the device comprises a 1-ultraviolet laser, a 2-optical guide rail, a 3-linear moving platform, a 4-reflecting mirror, a 5-first diaphragm, a 6-second diaphragm, a 7-beam expander, an 8-cylindrical lens, a 9-phase mask plate, a 10-broadband light source, a 11-first optical fiber clamp, a 12-second optical fiber clamp, a 13-photosensitive optical fiber, a 14-circulator, a 15-spectrometer, a 16-one-dimensional motor displacement platform and a 17-computer.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but 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.
As shown in fig. 1, the continuous writing system of the present invention comprises an ultraviolet laser 1, an optical guide rail 2, a first linear displacement platform 3, a broadband light source 10, a photosensitive optical fiber 13, a circulator 14, a spectrometer 15, a computer 17 and a second linear displacement platform 16; a reflector 4, a first diaphragm 5, a second diaphragm 6, a beam expander 7, a cylindrical lens 8 and a phase mask plate 9 are sequentially arranged on the optical guide rail; the second linear displacement platform 16 is provided with a first optical fiber clamp 11 and a second optical fiber clamp 12 in sequence, and the first optical fiber clamp 11 and the second optical fiber clamp 12 are used for clamping and fixing the photosensitive optical fiber 13;
the optical guide rail 2 is arranged on the first linear moving platform 3, the first linear moving platform 3 and the second linear moving platform 16 are respectively connected with a computer 17, and the computer 17 is used for controlling the moving speed and the moving mode of the optical guide rail 2, the first optical fiber clamp 11 and the second optical fiber clamp 12;
the reflector 4, the first diaphragm 5, the second diaphragm 6, the beam expander 7, the cylindrical lens 8 and the phase mask 9 can synchronously move along the optical guide rail 2 on the first linear moving platform 3 according to the speed and the mode set by the computer 17;
the reflecting mirror 4 is used for changing the track of the ultraviolet laser and ensuring that the ultraviolet laser beam emitted by the ultraviolet laser 1 is positioned at the central lines of the first diaphragm 5, the second diaphragm 6, the beam expander 7, the cylindrical lens 8 and the phase mask plate 9;
the circulator 14 is connected with the broadband light source 10, the spectrometer 15 and the photosensitive optical fiber 13 respectively, and is used for changing the direction of the reflected light signal, so that the signal acquisition of the spectrometer 15 is facilitated.
The viewing optics are also arranged on the second linear displacement stage, to which is connected the photosensitive fiber 13.
In one embodiment of the present embodiment, the ultraviolet laser 1 provides an ultraviolet laser output having a center wavelength of 193nm, 244nm, 248nm, or 308nm; the repetition frequency of the ultraviolet laser 1 is set to be 10-40 HZ, the high-voltage module is set to be 18-22KV, the single pulse energy is set to be 80-150mJ, and the pulse number is set to be 2000-10000.
In a specific implementation of this embodiment, the first diaphragm 5 is a transverse rectangular diaphragm, and the second diaphragm 6 is a longitudinal rectangular diaphragm; the two are used for selecting and limiting the ultraviolet laser beam passing through the reflecting mirror 4, so that the purpose of adjusting the position, the shape and the size of the ultraviolet laser beam is realized, and 8X 5mm rectangular light spots are obtained, and the non-uniformity of the light spots is less than 5%.
In a specific implementation of this embodiment, the beam expander 7 is configured to expand the beam spot of the ultraviolet laser beam passing through the first diaphragm 5 and the second diaphragm 6, and can expand the beam size by 2 to 4 times.
In a specific implementation manner of this embodiment, the cylindrical lens 8 is a plano-convex positive cylindrical lens, and has a length of 70mm, a width of 15mm, a focal length of 30mm, and a radius of curvature of 15mm, and is used for converging the ultraviolet laser beam from the beam expander 7 to obtain a beam with a specific shape.
In a specific implementation manner of this embodiment, the mask area of the phase mask plate 9 may be 10mm×10mm, 15mm×10mm or 20mm×10mm, and the period may be 362nm, 446nm, 528nm or 681nm, so as to divide the incident ultraviolet laser beam passing through the cylindrical lens 8 into two +1-order and-1-order diffraction beams with equal optical power, where the two laser beams interfere to form light-dark alternate fringes, and the light-dark alternate fringes act on the photosensitive optical fiber 13 to expose to form a fiber grating with a corresponding period, and the space between the photosensitive optical fiber 13 and the phase mask plate 9 is 3-10 mm.
In a specific implementation manner of this embodiment, the broadband light source 10 is connected to the photosensitive optical fiber 13, and outputs broadband signal light with a wavelength range of 1000nm to 2400nm, and the output end pigtail connector can be of SC, FC, LC or ST type; the first optical fiber clamp 11 and the second optical fiber clamp 12 are used for clamping and fixing the photosensitive optical fiber 13, and the space between the two is 1000mm; the spectrometer 15 has a wavelength range of 1200-2400 nm and a wavelength precision of + -0.05 nm, and is used for monitoring the reflection and transmission spectrum conditions in the grating writing process in real time.
In one embodiment of the present embodiment, the second linear displacement stage 16 is capable of independently controlling the first optical fiber clamp 11 and the second optical fiber clamp 12, respectively, located thereon, to provide a force in a horizontal direction, the magnitude of which is regulated by the computer 17. The center wavelength of the written fiber grating is changed by adjusting the magnitudes of the forces in the horizontal direction of the optical fibers by the first and second fiber clamps 11 and 12.
In one implementation of this embodiment, the second linear displacement stage 16 is a one-dimensional motor displacement stage; the linear platform travel of the first linear moving platform 3 and the second linear moving platform 16 is 1000mm, the resolution of an encoder is 50nm, the maximum speed is 100mm/s, the load capacity is 100kg, and the travelling speed and the travelling mode of the first linear moving platform 3 and the second linear moving platform 16 are set through the computer 17.
As shown in fig. 2, the continuous writing method of the present invention, using the writing system of the present invention, comprises the steps of:
removing the coating on the surface of the photosensitive optical fiber 13, wiping the surface of the photosensitive optical fiber 13 with alcohol cotton to remove the coating, placing the treated photosensitive optical fiber 13 on a second linear moving platform 16 in a continuous writing system, and clamping and fixing the photosensitive optical fiber 13 through a first optical fiber clamp 11 and a second optical fiber clamp 12;
setting the repetition frequency of the ultraviolet laser 1 to be 10-40 Hz, setting the high-voltage module to be 18-22KV, setting the single pulse energy to be 80-150mJ, and starting the ultraviolet laser 1 to emit ultraviolet laser beams with the center wavelength of 193nm, 244nm, 248nm or 308nm to be directly incident on the reflecting mirror 4 on the optical guide rail 2;
after being reflected by the reflecting mirror 4, the ultraviolet laser sequentially passes through the first diaphragm 5 and the second diaphragm 6 for selection and shaping to obtain rectangular light spots with the dimensions of 8 multiplied by 5mm and the non-uniformity of less than 5%; the rectangular light spots are further sequentially incident to a cylindrical lens 8 and a phase mask plate 9 after the beam size is enlarged by 2-4 times through a beam expander 7 to obtain +1-level and-1-level diffraction beams, and the two beams of laser interference form light-dark alternate fringes to act on a photosensitive optical fiber 13;
the condition that signal light emitted by the broadband light source 10 passes through the reflection spectrum and the transmission spectrum of the photosensitive optical fiber 13 is monitored in real time through the spectrometer 15 until the number of ultraviolet laser pulses is 2000-10000 and the time is 40-120 s, so that the fiber grating with the reflectivity of 10-99% and the period of 362nm, 446nm, 528nm or 681nm is obtained;
the computer 17 is used for controlling the second optical fiber clamp 12 on the second linear displacement platform 16 to move rightwards for 5N force to the photosensitive optical fiber 1, the optical guide rail 2 on the first linear displacement platform 3 moves on the first linear displacement platform 3 for 1-3 s at the speed of 20-100 mm/s, the reflector 4, the first diaphragm 5, the second diaphragm 6, the beam expander 7, the cylindrical lens 8 and the phase mask plate 9 move on the first linear displacement platform 3 along with the optical guide rail 2 for 60-100 mm, then the photosensitive optical fiber 1 stays at the position for 40-120 s, and the steps are repeated to obtain a second optical fiber grating;
the steps are repeated, and finally, the fiber grating array without the welding spot serial connection can be continuously inscribed on the same photosensitive fiber 13.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (9)
1. A linear movable fiber bragg grating continuous inscription system is characterized in that: the device comprises an ultraviolet laser (1), an optical guide rail (2), a first linear moving platform (3), a broadband light source (10), a photosensitive optical fiber (13), a circulator (14), a spectrometer (15), a computer (17) and a second linear moving platform (16); a reflecting mirror (4), a first diaphragm (5), a second diaphragm (6), a beam expander (7), a cylindrical lens (8) and a phase mask plate (9) are sequentially arranged on the optical guide rail; the second linear moving platform (16) is sequentially provided with a first optical fiber clamp (11) and a second optical fiber clamp (12), and the first optical fiber clamp (11) and the second optical fiber clamp (12) are used for clamping and fixing the photosensitive optical fiber (13);
the optical guide rail (2) is arranged on the first linear moving platform (3), the first linear moving platform (3) and the second linear moving platform (16) are respectively connected with a computer (17), and the computer (17) is used for controlling the moving speed and the moving mode of the optical guide rail (2), the first optical fiber clamp (11) and the second optical fiber clamp (12); the second linear moving platform (16) can independently control the first optical fiber clamp (11) and the second optical fiber clamp (12) which are positioned on the second linear moving platform;
the reflector (4), the first diaphragm (5), the second diaphragm (6), the beam expander (7), the cylindrical lens (8) and the phase mask plate (9) can synchronously move along with the optical guide rail (2) on the first linear moving platform (3) according to the speed and the mode set by the computer (17);
the reflecting mirror (4) is used for changing the track of the ultraviolet laser and ensuring that the ultraviolet laser beam emitted by the ultraviolet laser (1) is positioned at the central lines of the first diaphragm (5), the second diaphragm (6), the beam expander (7), the cylindrical lens (8) and the phase mask plate (9);
the circulator (14) is respectively connected with the broadband light source (10), the spectrometer (15) and the photosensitive optical fiber (13) and is used for changing the direction of a reflected light signal so as to facilitate signal acquisition of the spectrometer (15).
2. The system for continuously inscribing a linearly movable fiber grating of claim 1, wherein: the ultraviolet laser (1) provides ultraviolet laser output, and the central wavelength of the output ultraviolet laser is 193nm, 244nm, 248nm or 308nm.
3. The system for continuously inscribing a linearly movable fiber grating of claim 1, wherein: the first diaphragm (5) is a transverse rectangular diaphragm, and the second diaphragm (6) is a longitudinal rectangular diaphragm.
4. The system for continuously inscribing a linearly movable fiber grating of claim 1, wherein: the beam expander (7) is used for expanding the ultraviolet laser beam spots passing through the first diaphragm (5) and the second diaphragm (6).
5. The system for continuously inscribing a linearly movable fiber grating of claim 1, wherein: the cylindrical lens (8) is a plano-convex positive cylindrical lens and is used for converging the ultraviolet laser beams from the beam expander (7) to obtain beams with specific shapes.
6. The system for continuously inscribing a linearly movable fiber grating of claim 1, wherein: the phase mask plate (9) is used for dividing an incident ultraviolet laser beam passing through the cylindrical lens (8) into two +1-level and-1-level diffraction beams with equal optical power, and the two beams of laser interference form light-dark alternate stripes which act on the photosensitive optical fiber (13) to expose to form a fiber grating with a corresponding period.
7. The system for continuously inscribing a linearly movable fiber grating of claim 1, wherein: the broadband light source (10) is connected with the photosensitive optical fiber (13) and outputs broadband signal light with the wavelength range of 1000 nm-2400 nm, and the spectrometer (15) is used for monitoring the reflection and transmission spectrum conditions in the grating writing process in real time.
8. The system for continuously inscribing a linearly movable fiber grating of claim 1, wherein: the second linear moving platform (16) is a one-dimensional motor displacement platform; the linear platform travel adopted by the first linear moving platform (3) and the second linear moving platform (16) is 1000mm, the resolution of an encoder is 50nm, the maximum speed is 100mm/s, the load capacity reaches 100kg, and the advancing speed and the moving mode of the first linear moving platform (3) and the second linear moving platform (16) are set through a computer (17).
9. A method for continuously inscribing a linear movable fiber grating is characterized in that: use of a inscription system according to any of claims 1 to 8, comprising the steps of:
setting the repetition frequency of the ultraviolet laser (1) to be 10-40 Hz, setting the high-voltage module to be 18-22KV, setting the single pulse energy to be 80-150mJ, and directly incidence the ultraviolet laser beam with the center wavelength of 193nm, 244nm, 248nm or 308nm emitted by the ultraviolet laser (1) on the reflector (4) on the optical guide rail (2) after the ultraviolet laser is started;
after being reflected by the reflecting mirror (4), the ultraviolet laser sequentially passes through the first diaphragm (5) and the second diaphragm (6) for selection and shaping to obtain rectangular light spots with the dimensions of 8 multiplied by 5mm and the non-uniformity of less than 5%; the rectangular light spots are further sequentially incident to a cylindrical lens (8) and a phase mask plate (9) after the beam size is enlarged by 2-4 times through a beam expander (7) to obtain +1-level and-1-level diffraction beams, and the two beams of laser interference form light-dark alternate fringes to act on a photosensitive optical fiber (13);
the reflection and transmission spectrum conditions of signal light emitted by the broadband light source (10) through the photosensitive optical fiber (13) are monitored in real time through the spectrometer (15) until the number of ultraviolet laser pulses is 2000-10000 and the time is 40-120 s, so that the fiber bragg grating with the reflectivity of 10-99% and the period of 362nm, 446nm, 528nm or 681nm is obtained;
a computer (17) is used for controlling a second optical fiber clamp (12) on a second linear moving platform (16) to move rightwards for 5N force to a photosensitive optical fiber (13), an optical guide rail (2) on a first linear moving platform (3) moves on the first linear moving platform (3) for 1-3 s at a speed of 20-100 mm/s, a reflecting mirror (4), a first diaphragm (5), a second diaphragm (6), a beam expander (7), a cylindrical lens (8) and a phase mask plate (9) move on the first linear moving platform (3) along with the optical guide rail (2) for 60-100 mm, then the photosensitive optical fiber stays at the position for 40-120 s, and the steps are repeated to obtain a second optical fiber grating;
and repeating the steps, and finally, continuously inscribing the fiber bragg grating array without the welding spots on the same photosensitive fiber (13).
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| CN203838364U (en) * | 2014-05-11 | 2014-09-17 | 中国科学技术大学 | Inscribing device of sampling fiber Bragg grating |
| CN109991699A (en) * | 2017-12-29 | 2019-07-09 | 北京交通大学 | 2 mu m waveband phase shift sampling optical-fiber gratings and manufacturing system and method |
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| AU2017319799A1 (en) * | 2016-09-02 | 2019-03-14 | Cyprus University Of Technology | Femtosecond laser inscription |
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| CN109991699A (en) * | 2017-12-29 | 2019-07-09 | 北京交通大学 | 2 mu m waveband phase shift sampling optical-fiber gratings and manufacturing system and method |
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