CN103616741A - Device for preparing intermediate infrared fiber bragg grating - Google Patents
Device for preparing intermediate infrared fiber bragg grating Download PDFInfo
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- CN103616741A CN103616741A CN201310668896.6A CN201310668896A CN103616741A CN 103616741 A CN103616741 A CN 103616741A CN 201310668896 A CN201310668896 A CN 201310668896A CN 103616741 A CN103616741 A CN 103616741A
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Abstract
The invention discloses a device for preparing an intermediate infrared fiber bragg grating. The device is characterized in that a femtosecond laser device emits a high-energy femtosecond laser, and is aligned by a collimating lens; the size of a laser spot is adjusted by a small aperture; laser pulse energy is adjusted by a 1/2 wave plate and a glan prism; finally, the laser enters a convex-plane cylindrical lens through a reflector, and then a diffraction light is generated through a bragg phase mask; +1 level and -1 level diffraction lights generate interference fringes in an overlapping region; an optical fiber is erected on a precision displacement platform; one end of the optical fiber is connected with a broadband light source, and the other end of the optical fiber is connected with a spectral measurement instrument. By adopting the device, a method for preparing the intermediate infrared fiber bragg grating is achieved. The optical system is simple, the method has no demand on the light sensitivity of the optical fiber except for the advantages of traditional ultraviolet (UV) excimer laser writing grating, and the prepared fiber grating has excellent temperature stability.
Description
Technical field
The present invention relates to a kind of fiber grating technology of preparing, especially a kind of based on infrared bragg grating preparation facilities in phase-mask method and femtosecond laser.
Background technology
Mid-infrared fiber laser can be widely used in the fields such as medical science, sensing, national defence.But be limited to middle infrared optical fiber grating, current mid-infrared fiber laser has all been used many such as optical lens mostly, the Free Space Optics devices (bulk optics) such as inverse mirror, cannot realize full fiberize, and this has limited the range of application of mid-infrared fiber laser greatly.Therefore, prepare high-quality middle infrared optical fiber grating and there is important value.
High-energy fly secondary laser relies on superelevation peak power and ultrafast action time, while acting on material, by multiphoton ionization, causes densification, causes the part of insulating material after light blast to be melted and rapid quenching, changes the refractive index of material.Therefore high-energy fly secondary laser can act on glass optical fiber, and the refractive index of glass optical fiber fibre core is carried out to periodic modulation, realizes grating effect.
We propose a kind of method and apparatus of preparing middle infrared optical fiber grating based on femtosecond laser and phase masks, during the middle infrared optical fiber Bragg grating of inscribing out can be applicable to, the development of infrared full-optical-fiber laser, also can be used for the development of mid-infrared light fiber grating sensor.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of based on infrared bragg grating preparation facilities in phase-mask method and femtosecond laser.
The present invention can be achieved through the following technical solutions.
Infrared bragg grating preparation facilities in a kind of, it is characterized in that by femto-second laser 1, collimation lens 2, aperture 3, 1/2 wave plate 4, Glan prism 5, catoptron 6, plano-convex post lens 7, Prague phase mask plate 8, optical fiber 9, precision displacement platform 10, wideband light source 11, optical spectrum instrumentation 12 forms, femto-second laser 1 sends high-octane femtosecond laser, through collimation lens 2 collimations, and adjust laser facula size by aperture 3, through 1/2 wave plate 4 and Glan prism 5, regulate pulsed laser energy, by catoptron 6, incide on plano-convex post lens 7, through Prague phase mask plate 8, produce again
order diffraction light, + 1 grade produces interference fringe with-1 order diffraction light in overlapping region, optical fiber 9 is erected on precision displacement platform 10, by precision displacement platform, adjust fiber position, make overlapping region that above-mentioned+1 grade and-1 order diffraction light interferes on fiber core, thereby the variation that interference fringe can induction optical fiber fiber core refractive index generating period, form optical fiber Bragg fiber grating, in online preparation process, optical fiber one end connects wideband light source 11, the other end connects optical spectrum instrumentation 12, observes the real-time growth pattern of optical grating reflection rate by transmitted spectrum.
Femto-second laser 1 of the present invention is titanium-doped sapphire femtosecond laser regenerative amplifier, and operation wavelength is 800nm, and repetition frequency is 1KHz, and maximum impulse energy is 2.2mJ;
Of the present inventionly write the middle-infrared band that the bragg grating reflectance spectrum centre wavelength of making is positioned at 2-5 μ m, determined by cycle of Prague phase mask plate, specific as follows: λ
b=2n
effΛ
g; Λ
g=Λ
pM/ 2; Wherein, λ
bfor bragg grating reflectance spectrum centre wavelength, n
efffiber core effective refractive index, Λ
gfor bragg grating index modulation cycle, Λ
pMfor the phase mask plate cycle.
Optical fiber 9 of the present invention can be silica fibre (Silicon Fiber), or fluoride fiber (Fluoride Fiber), or germanide (Germanate Fiber), or chalcogenide fiber (Chalcogenide Fiber).
Optical fiber 9 of the present invention can be passive fiber, can be also the adulterated Active Optical Fiber of rare earth ion of fibre core.
Optical fiber 9 of the present invention can be single cladded-fiber, can be also doubly clad optical fiber.
The advantages such as the present invention has simple in structure, easy operating, in preparation infrared bragg grating temperature stability good, be difficult for being wiped free of infrared full-optical-fiber laser in can be applicable to, the development of mid-infrared light fiber grating sensor.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation of the present invention.
Mark in figure: femto-second laser 1, collimation lens 2, aperture 3,1/2 wave plates 4, Glan prism 5, catoptron 6, plano-convex post lens 7, Prague phase mask plate 8, optical fiber 9, precision displacement platform 10, wideband light source 11, optical spectrum instrumentation 12.
Embodiment
The invention will be further described by reference to the accompanying drawings:
As shown in Figure 1, infrared bragg grating (FBG) preparation facilities in a kind of, comprise femto-second laser 1, collimation lens 2, aperture 3, 1/2 wave plate 4, Glan prism 5, catoptron 6, plano-convex post lens 7, Prague phase mask plate 8, optical fiber 9, precision displacement platform 10, wideband light source 11, optical spectrum instrumentation 12, it is characterized in that femto-second laser 1 sends high-octane femtosecond laser, through collimation lens 2 collimations, and adjust laser facula size by aperture 3, through 1/2 wave plate 4 and Glan prism 5, regulate pulsed laser energy, by catoptron 6, incide on plano-convex post lens 7, through Prague phase mask plate 8, produce again
order diffraction light, + 1 grade produces interference fringe with-1 order diffraction light in overlapping region, optical fiber 9 is erected on precision displacement platform 10, by precision displacement platform, adjust fiber position, make overlapping region that above-mentioned+1 grade and-1 order diffraction light interferes on fiber core, thereby the variation that interference fringe can induction optical fiber fiber core refractive index generating period, forms optical fiber Bragg fiber grating.In online preparation process, optical fiber one end connects wideband light source 11, and the other end connects optical spectrum instrumentation 12, observes the real-time growth pattern of optical grating reflection rate by transmitted spectrum.
Described femto-second laser 1 is titanium-doped sapphire femtosecond laser regenerative amplifier, and operation wavelength is 800nm, and repetition frequency is 1KHz, and maximum impulse energy is 2.2mJ;
Described write the middle-infrared band that the bragg grating reflectance spectrum centre wavelength of making is positioned at 2-5 μ m, determined by cycle of Prague phase mask plate.Specific as follows: λ
b=2n
effΛ
g; Λ
g=Λ
pM/ 2; Wherein, λ
bfor bragg grating reflectance spectrum centre wavelength, n
efffiber core effective refractive index, Λ
gfor bragg grating index modulation cycle, Λ
pMfor the phase mask plate cycle;
Described optical fiber 9 can be silica fibre (Silicon Fiber), or fluoride fiber (Fluoride Fiber), or germanide (Germanate Fiber), or chalcogenide fiber (Chalcogenide Fiber); Can be passive fiber, can be also the adulterated Active Optical Fiber of rare earth ion of fibre core; Can be single cladded-fiber, can be also doubly clad optical fiber;
Described wideband light source 11 can be based on spontaneous radiation, to amplify the wideband light source of (ASE), can be also the wideband light source based on super continuous (Supercontinuum Generation) effect.Wideband light source has covered the centre wavelength of the Fiber Bragg Grating FBG of the system of writing.
Claims (8)
1. infrared bragg grating preparation facilities in a kind, comprise femto-second laser, collimation lens, aperture, 1/2 wave plate, Glan prism, catoptron, plano-convex post lens, Prague phase mask plate, optical fiber, precision displacement platform, wideband light source, optical spectrum instrumentation, it is characterized in that femto-second laser sends high-octane femtosecond laser, through collimation lens collimation, and adjust laser facula size by aperture, through 1/2 wave plate and Glan prism, regulate pulsed laser energy, by catoptron, incide on plano-convex post lens, through Prague phase mask plate, produce again
order diffraction light, + 1 grade produces interference fringe with-1 order diffraction light in overlapping region, optical fibre frame is located on precision displacement platform, by precision displacement platform, adjust fiber position, make overlapping region that above-mentioned+1 grade and-1 order diffraction light interferes on fiber core, the variation of interference fringe induction optical fiber fiber core refractive index generating period, form optical fiber Bragg fiber grating, in online preparation process, optical fiber one end connects wideband light source, the other end connects optical spectrum instrumentation, observes the real-time growth pattern of optical grating reflection rate by transmitted spectrum.
According to claim 1 a kind of in infrared bragg grating preparation facilities, it is characterized in that femto-second laser 1 is for titanium-doped sapphire femtosecond laser regenerative amplifier, operation wavelength is 800nm, repetition frequency is 1KHz, maximum impulse energy is 2.2mJ.
According to claim 1 a kind of in infrared bragg grating preparation facilities, it is characterized in that writing the middle-infrared band that the bragg grating reflectance spectrum centre wavelength of making is positioned at 2-5 μ m.
According to claim 1 a kind of in infrared bragg grating preparation facilities, it is characterized in that writing the bragg grating reflectance spectrum centre wavelength of making and determined by cycle of Prague phase mask plate: λ
b=2n
effΛ
g; Λ
g=Λ
pM/ 2; Wherein, λ
bfor bragg grating reflectance spectrum centre wavelength, n
efffiber core effective refractive index, Λ
gfor bragg grating index modulation cycle, Λ
pMfor the phase mask plate cycle.
According to claim 1 a kind of in infrared bragg grating preparation facilities, it is characterized in that optical fiber is silica fibre (Silicon Fiber) or fluoride fiber (Fluoride Fiber) or germanide (Germanate Fiber) or chalcogenide fiber (Chalcogenide Fiber).
According to claim 1 a kind of in infrared bragg grating preparation facilities, it is characterized in that optical fiber is the adulterated Active Optical Fiber of rare earth ion of passive fiber or fibre core.
7. infrared bragg grating preparation facilities in a kind of according to claim 1, is characterized in that optical fiber is single cladded-fiber or doubly clad optical fiber.
According to claim 1 a kind of in infrared bragg grating preparation facilities, it is characterized in that wideband light source is based on spontaneous radiation, to amplify wideband light source or the wideband light source based on super continuous (Supercontinuum Generation) effect of (ASE), wideband light source has covered the centre wavelength of the Fiber Bragg Grating FBG of the system of writing.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105137532A (en) * | 2015-09-25 | 2015-12-09 | 西北工业大学 | Method of simultaneously manufacturing high-temperature-resistance fiber bragg gratings and apparatus thereof |
| CN107765361A (en) * | 2017-11-17 | 2018-03-06 | 深圳大学 | Phase shift optical fiber Bragg grating preparation method, device and phase shift optical fiber Bragg grating |
| CN109655962A (en) * | 2019-02-28 | 2019-04-19 | 武汉理工大学 | The method that femtosecond laser inscribes grating array and the measurement of quasi-distributed many reference amounts online |
| CN110646878A (en) * | 2019-01-08 | 2020-01-03 | 北京信息科技大学 | Rapid preparation method of phase-shift Bragg fiber grating |
| CN111256739A (en) * | 2020-03-18 | 2020-06-09 | 华中科技大学 | Optical fiber sensor based on combination of full-fiber-core MZI and FBG and manufacturing method thereof |
| CN112964181A (en) * | 2021-03-29 | 2021-06-15 | 中南大学 | Optical fiber Bragg grating position detection device and measurement method thereof |
| CN113029333A (en) * | 2021-03-29 | 2021-06-25 | 中南大学 | Laser power detection device and measurement method thereof |
| CN113671621A (en) * | 2021-08-24 | 2021-11-19 | 南京邮电大学 | Linear movable fiber grating continuous writing system and method |
| CN115343796A (en) * | 2022-08-16 | 2022-11-15 | 常州莱特康光电科技有限公司 | Fiber grating apodization device and fiber grating apodization method |
| CN116088090A (en) * | 2023-03-29 | 2023-05-09 | 北京工业大学 | System for writing 2-micrometer large-mode-field fiber bragg grating based on mask method and working method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105137532A (en) * | 2015-09-25 | 2015-12-09 | 西北工业大学 | Method of simultaneously manufacturing high-temperature-resistance fiber bragg gratings and apparatus thereof |
| CN107765361A (en) * | 2017-11-17 | 2018-03-06 | 深圳大学 | Phase shift optical fiber Bragg grating preparation method, device and phase shift optical fiber Bragg grating |
| CN107765361B (en) * | 2017-11-17 | 2023-09-22 | 深圳大学 | Phase-shift fiber Bragg grating preparation method and device and phase-shift fiber Bragg grating |
| CN110646878A (en) * | 2019-01-08 | 2020-01-03 | 北京信息科技大学 | Rapid preparation method of phase-shift Bragg fiber grating |
| CN109655962A (en) * | 2019-02-28 | 2019-04-19 | 武汉理工大学 | The method that femtosecond laser inscribes grating array and the measurement of quasi-distributed many reference amounts online |
| CN111256739A (en) * | 2020-03-18 | 2020-06-09 | 华中科技大学 | Optical fiber sensor based on combination of full-fiber-core MZI and FBG and manufacturing method thereof |
| CN112964181A (en) * | 2021-03-29 | 2021-06-15 | 中南大学 | Optical fiber Bragg grating position detection device and measurement method thereof |
| CN113029333A (en) * | 2021-03-29 | 2021-06-25 | 中南大学 | Laser power detection device and measurement method thereof |
| CN113671621A (en) * | 2021-08-24 | 2021-11-19 | 南京邮电大学 | Linear movable fiber grating continuous writing system and method |
| CN115343796A (en) * | 2022-08-16 | 2022-11-15 | 常州莱特康光电科技有限公司 | Fiber grating apodization device and fiber grating apodization method |
| CN115343796B (en) * | 2022-08-16 | 2024-03-22 | 常州莱特康光电科技有限公司 | Fiber grating apodization device and fiber grating apodization method |
| CN116088090A (en) * | 2023-03-29 | 2023-05-09 | 北京工业大学 | System for writing 2-micrometer large-mode-field fiber bragg grating based on mask method and working method |
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