CN103296566A - Method for increasing power proportion of supercontinuum long waves in fluoride fiber - Google Patents
Method for increasing power proportion of supercontinuum long waves in fluoride fiber Download PDFInfo
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- CN103296566A CN103296566A CN2013102150210A CN201310215021A CN103296566A CN 103296566 A CN103296566 A CN 103296566A CN 2013102150210 A CN2013102150210 A CN 2013102150210A CN 201310215021 A CN201310215021 A CN 201310215021A CN 103296566 A CN103296566 A CN 103296566A
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Abstract
The invention relates to the field of supercontinuum laser, in particular to a method for effectively increasing power proportion of supercontinuum generation long waves in a fluoride fiber. The method includes arranging a Raman fiber between a pump fiber laser device and the fluoride fiber, and coupling laser outputted by the pump fiber laser device into the Raman fiber to acquire cascaded Raman laser; using the cascaded Raman laser as an excitation source to pump to the fluoride fiber to generate supercontinuum laser. The method has the advantages that an all-fiber structure is adopted and is simplified integrally, and the pump laser coupling efficiency and the work stability of the laser device are improved; after spectra of the pump laser are extended to the long waves by the low-cost Raman fiber, the fluoride fiber is pumped to acquire and output the supercontinuum laser in a middle-infrared band, proportions of supercontinuum middle-infrared components can be effectively increased, and requirements on the pulse width and the peak power of a pump source are lowered.
Description
Technical field
The present invention relates to the super continuous spectrums laser field, relate in particular to the method for the long wave power proportions that super continuous spectrums produces in a kind of effective raising fluoride fiber.
Background technology
The middle-infrared band super continuum source is having the important application prospect such as fields such as environment measuring, biomedicine, free space optical communication, infrared band spectroscopy, Homeland Securities.Because silica-based optical fibers suffers very large loss in middle-infrared band, the fiber optic materials of infrared super continuum source is mainly at the low-loss soft glass optical fiber of middle-infrared band in obtaining at present, as fluoride fiber, tellurides optical fiber and sulfide optical fiber, wherein fluoride fiber is than tellurides and sulfide optical fiber, physical property (optics, calorifics and mechanical performance) is more stable, preparation technology is more ripe, and fluoride fiber commercialization at present.Pumping laser is mainly operation wavelength at the pulsed erbium doped fiber laser of 1.5 mu m wavebands, the pulse thulium doped optical fiber laser of 2 mu m wavebands and the middle-infrared band pulse laser that optical parametric oscillator produces.Comparatively speaking, it is with high costs to obtain pumping laser by thulium doped fiber and optical parametric oscillator mode, and be in the research of Er-doped fiber laser of 1.5 mu m wavebands of research wave band of optical communication because the commercialization of this band of light electronic device, research is comparatively ripe, has unrivaled low-cost advantage.So by using one section fluoride fiber of 1.5 mu m waveband pulsed optical fibre laser pumpings, be still the technological means that the infrared excess continuous spectrum produces in the most attracting acquisition at present.List of references ([1] Qin for example, G., et al., Ultrabroadband supercontinuum generation from ultraviolet to6.28 μ m in a fluoride fiber.Applied physics letters, 2009.95:p.161103.) reported that using centre wavelength is the fluoride fiber of the femto-second laser pumping one segment length 2cm of 1.45 μ m, obtained the super wide super continuous spectrums output of spectral region from ultraviolet light to 6.28 μ m.
Yet because the zero dispersion point of fluoride fiber is usually located at 1.5 mu m wavebands, like this since the wavelength of the pumping laser of 1.5 mu m wavebands near the optical fiber zero dispersion point, self phase modulation in the optical fiber, four-wave mixing effect and orphan follow the nonlinear interactions such as generation of dispersive wave to make and finally export super continuous spectrums spectrum symmetry broadening, output spectrum is when expanding to long wave, also expand to the shortwave direction, cause the middle infrared power ratio of the final super continuous spectrums laser that obtains low.List of references ([2] Liu, L., et al., Numerical investigation of mid-infrared supercontinuum generation up to 5 μ m in single mode fluoride fiber.Optics express, 2011.19 (11): p.10041-10048.) having studied pumping wavelength especially by numerical simulation is the physical mechanism that 1.56 μ m picosecond magnitude pulse pump fluoride fibers produce super continuous spectrums, point out only to be 4 psecs by optimizing long wave (greater than the 2.5 μ m) power proportions that the pumping pulse parameter can improve super continuous spectrums at the pumping pulse width, peak power is 44.9% up to obtaining the highest long wave power proportions under the 100kW condition.How under based on 1.55 μ m pumping laser pumpings cheaply, further to improve the long wave power proportions, remain an important topic of present people's research.
Summary of the invention
The objective of the invention is to overcome above-mentioned the deficiencies in the prior art, the method of the long wave power proportions that super continuous spectrums produces in a kind of effective raising fluoride fiber is provided, this technical method has characteristics such as all optical fibre structure, cost are low, good stability, long wave power proportions height, is easy to promote the use of.
The technical solution adopted in the present invention is as follows:
A kind of method that improves super continuous spectrums long wave power proportions in the fluoride fiber, comprise pumping optical fiber laser and fluoride fiber, between described pumping optical fiber laser and fluoride fiber, introduce one section Raman fiber, the output laser coupled of pumping optical fiber laser enters described Raman fiber, obtains the cascade raman laser; Use described cascade raman laser as driving source then, thereby the described fluoride fiber of pumping produce super continuous spectrums laser.
Further, described pumping optical fiber laser is 1.5 mu m waveband pumping optical fiber lasers, and described super continuous spectrums laser is positioned at middle-infrared band.
Further, the pulse duration of described pumping optical fiber laser is greater than 1 psec, and peak power is higher than 500W.
Further, described fluoride fiber is step index type refractive index structures optical fiber, photon crystal structure optical fiber or microstructured optical fibers.
Further, the mode that is of coupled connections between the output optical fibre of described pumping optical fiber laser and the described Raman fiber, and/or the mode that is of coupled connections of described Raman fiber and described fluoride fiber are space mechanism butt joint coupling or directly welding coupling.
The present invention also provides a kind of super continuum source that improves the long wave power proportions, comprise pumping optical fiber laser and fluoride fiber, between described pumping optical fiber laser and fluoride fiber, introduce one section Raman fiber, the output laser coupled of pumping optical fiber laser enters described Raman fiber, obtains the cascade raman laser; Use described cascade raman laser as driving source then, thereby the described fluoride fiber of pumping produce super continuous spectrums laser.
Further, described pumping optical fiber laser is 1.5 mu m waveband pumping optical fiber lasers, and described super continuous spectrums laser is positioned at middle-infrared band.
Further, the pulse duration of described pumping optical fiber laser is greater than 1 psec, and the peak power scope is higher than 500W.
Further, described fluoride fiber is step index type refractive index structures optical fiber, photon crystal structure optical fiber or microstructured optical fibers.
Further, the mode that is of coupled connections between the output optical fibre of described pumping optical fiber laser and the described Raman fiber, and/or the mode that is of coupled connections of described Raman fiber and described fluoride fiber are space mechanism butt joint coupling or directly welding coupling.
The present invention adopts all optical fibre structure, because Raman fiber has normal dispersion at whole near infrared band, can guarantee that after the laser pumping, the cascade Raman effect accounts for leading, makes spectrum expand to long wave.For example for the pumping source of 1.5 mu m wavebands, utilize the Raman fiber can be with the operation wavelength of pumping source after 1.5 mu m wavebands are transferred to the multi-stage cascade Raman peaks of long wave direction, one section fluoride fiber of pumping again, the super continuous spectrums laser output that finally produces middle-infrared band.
Beneficial effect of the present invention is:
1. the present invention adopts all optical fibre structure, simplified overall structure, improved pumping laser coupling efficiency, increased laser works stability.
By Raman fiber cheaply with pumping laser spectrum after long wave is expanded, one section fluoride fiber of pumping obtains the super continuous spectrums laser output of middle-infrared band again, can effectively improve super continuous spectrums in infrared component ratio, reduced the requirement to pulse duration and the peak power of pumping source.
Description of drawings
Fig. 1 is that the structure of the embodiment of the invention is formed schematic diagram.
Fig. 2 is the dispersion curve figure of Raman fiber and fluoride fiber in the embodiment of the invention.
Fig. 3 is Raman fiber output spectrum figure among the expression embodiment.
Fig. 4 represents the output spectrum figure of fluoride fiber among the embodiment.
Fig. 5 is that 1.55 μ m optical-fiber laser pump-coupling fluoride fibers produce the super continuous spectrums spectrogram.
Fig. 6 exports the long wave power proportions of super continuous spectrums with wavelength change figure in the embodiment of the invention.
Embodiment
The present invention is further described below in conjunction with drawings and Examples, but should not limit protection scope of the present invention with this.
See also Fig. 1 earlier, Fig. 1 has provided an embodiment of the super continuum source of raising long wave power proportions of the present invention.Specifically by 1.5 mu m waveband pumping optical fiber lasers 1, Raman fiber 2 and fluoride fiber 3 are formed.Wherein the output optical fibre 4 of 1.5 mu m waveband pumping optical fiber lasers 1 links to each other with Raman fiber 2, and Raman fiber 2 links to each other with fluoride fiber 3.1.5 mu m waveband pumping optical fiber lasers, 1 output laser coupled is entered one section Raman fiber 2, obtain the output spectrum scope greater than the multi-stage cascade raman laser of 1.5 μ m; Further, use this cascade raman laser as driving source, one section fluoride fiber of pumping 3 produces output spectrum at the super continuous spectrums of 1.5-4.5 μ m.
1.5 mu m waveband fiber lasers 1 are the mode locking pulse fiber laser of 60ps, peak power 10kW for amplifying the back output pulse width in the present embodiment, and the output laser center wavelength is 1.55 μ m.
Raman fiber described in the present invention has normal dispersion at whole near infrared band, and it is leading that its length can guarantee that after the 1.5 mu m waveband laser pumpings output spectrum cascade Raman effect accounts for, and makes spectrum effectively expand to long wave.Raman fiber 2 is for mixing germanium silicon-base Raman optical fiber in the present embodiment, and length is 8m.
The fluoride glass optical fiber that infrared soft glass optical fiber 3 is the step index type in the present embodiment, its fibre core cladding diameter size ratio be 9/125 μ m, fibre core numerical aperture NA is 0.27, fiber lengths is 9m, the zero-dispersion wavelength of this optical fiber is 1.495 μ m, less than the wave-length coverage of 1.495 μ m all in the normal dispersion district of this optical fiber.
Pumping optical fiber laser output optical fibre and Raman fiber among the present invention, and the coupling between Raman fiber and the fluoride fiber can adopt dual mode: one, be coupled by the space mechanism docking mode, this mode can reduce the welding difficulty, and technology is simple, is easy to realize; Its two, directly welding coupling, this mode can obtain higher coupling efficiency.
Coupling described in the present embodiment between 1.5 mu m waveband pumping optical fiber laser 1 and the Raman fiber 2, and the coupling 5 between Raman fiber 2 and the fluoride fiber 3 all adopt direct welding coupled modes, and this mode can obtain higher coupling efficiency.
Fig. 2 has provided the dispersion curve figure of Raman fiber 2 and fluoride fiber 3 in the present embodiment.Dotted line represents Raman fiber 2 dispersion curves among the figure, solid line represent fluoride optical fiber 3 dispersion curves.The Raman fiber zero dispersion point is near 2.8 μ m as can be seen, and whole near infrared band all is normal dispersion, and the fluoride fiber zero dispersion point is anomalous dispersion zones greater than 1.5 mu m wavebands near 1.5 μ m.
Fig. 3 and Fig. 4 are the laser light spectrograms of diverse location output in the embodiment of the invention.As can be seen from Figure 3,1.5 mu m waveband pumping optical fiber laser 1 is by after the long Raman fiber 2 of 8m, output spectrum mainly is that spectral region is formed in the cascade Raman peaks of the separation of 1.5-2.4 μ m, fluoride fiber 3 by 9m carries out after frequency spectrum develops again, and output super continuous spectrums spectral region has effectively covered the wavelength band (see figure 4) of from 1.5 to 4.5 μ m.
Fig. 5 is the spectrogram that adopts 1.5 mu m waveband pumping optical fiber lasers, 1 pump-coupling fluoride fiber, 3 generation super continuous spectrums in the present embodiment, and output spectrum has covered the scope of from 0.7 to 3.8 μ m as can be seen.Comparison diagram 4 as can be seen, because the effect of Raman fiber 2 in the embodiment of the invention, the spectrum long wave of final fluoride fiber 3 output super continuous spectrums further has been extended to 4.5 μ m, and the shortwave direction is cut off, the output super continuous spectrums mainly concentrates on the long wave direction on spectral region, be conducive to improve super continuous in infrared component ratio.
Fig. 6 exports the long wave power proportions of super continuous spectrums with wavelength change figure (shown in solid line among the figure) in the embodiment of the invention, the initial wavelength X of super continuous spectrums long wave power proportions is calculated in the representative of its abscissa, for example λ be 2.5 μ m represent the super continuous spectrums wave-length coverage more than 2.5 μ m the long wave power proportions.Be directly to use the long wave power proportions of 1.5 mu m waveband pumping optical fiber lasers, 1 pumping fluoride fiber, 3 super continuous spectrums with the wavelength change curve shown in the dotted line among the figure.As can be seen from Figure 6, producing the power proportions of super continuous spectrums more than 2.5 μ m in the embodiment of the invention is 54.4%, and the pump-coupling mode to produce the power proportions of super continuous spectrums more than 2.5 μ m only be 19.8%, prove absolutely that the present invention can be effectively improves the long wave power proportions of super continuous spectrums.
Claims (10)
1. method that improves super continuous spectrums long wave power proportions in the fluoride fiber, comprise pumping optical fiber laser and fluoride fiber, it is characterized in that: between described pumping optical fiber laser and fluoride fiber, introduce one section Raman fiber, the output laser coupled of pumping optical fiber laser enters described Raman fiber, obtains the cascade raman laser; Use described cascade raman laser as driving source then, thereby the described fluoride fiber of pumping produce super continuous spectrums laser.
2. the method for super continuous spectrums long wave power proportions in the raising fluoride fiber according to claim 1, it is characterized in that: described pumping optical fiber laser is 1.5 mu m waveband pumping optical fiber lasers, and described super continuous spectrums laser is positioned at middle-infrared band.
3. the method for super continuous spectrums long wave power proportions in the raising fluoride fiber according to claim 2, it is characterized in that: the pulse duration of described pumping optical fiber laser is greater than 1 psec, and the peak power scope is higher than 500W.
4. according to the method for super continuous spectrums long wave power proportions in claim 1 or the 2 or 3 described raising fluoride fibers, it is characterized in that: described fluoride fiber is step index type refractive index structures optical fiber, photon crystal structure optical fiber or microstructured optical fibers.
5. the method for super continuous spectrums long wave power proportions in the raising fluoride fiber according to claim 1, it is characterized in that: the mode that is of coupled connections between the output optical fibre of described pumping optical fiber laser and the described Raman fiber, and/or the mode that is of coupled connections of described Raman fiber and described fluoride fiber, be space mechanism butt joint coupling or directly welding coupling.
6. super continuum source that improves the long wave power proportions, comprise pumping optical fiber laser and fluoride fiber, it is characterized in that: between described pumping optical fiber laser and fluoride fiber, introduce one section Raman fiber, the output laser coupled of pumping optical fiber laser enters described Raman fiber, obtains the cascade raman laser; Use described cascade raman laser as driving source then, thereby the described fluoride fiber of pumping produce super continuous spectrums laser.
7. the super continuum source of raising long wave power proportions according to claim 6, it is characterized in that: described pumping optical fiber laser is 1.5 mu m waveband pumping optical fiber lasers, and described super continuous spectrums laser is positioned at middle-infrared band.
8. the super continuum source of raising long wave power proportions according to claim 7, it is characterized in that: the pulse width range of described pumping optical fiber laser is greater than 1 psec, and the peak power scope is higher than 500W.
9. the super continuum source of raising long wave power proportions according to claim 6, it is characterized in that: described fluoride fiber is step index type refractive index structures optical fiber, photon crystal structure optical fiber or microstructured optical fibers.
10. the super continuum source of raising long wave power proportions according to claim 6, it is characterized in that: the mode that is of coupled connections between the output optical fibre of described pumping optical fiber laser and the described Raman fiber, and/or the mode that is of coupled connections of described Raman fiber and described fluoride fiber, be space mechanism butt joint coupling or directly welding coupling.
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Cited By (9)
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| CN103825164A (en) * | 2013-12-03 | 2014-05-28 | 上海交通大学 | High average power full optical fiber intermediate infrared supercontinuum light source |
| CN105849986A (en) * | 2013-10-30 | 2016-08-10 | 马克斯·普朗克科学促进学会 | Supercontinuum system with microstructured photonic crystal fibers based on fluoride glass |
| CN106253042A (en) * | 2016-10-21 | 2016-12-21 | 陕西师范大学 | Broadband based on super continuum source is tunable pulse optical fiber |
| CN106842762A (en) * | 2017-04-20 | 2017-06-13 | 陕西师范大学 | It is a kind of to cascade the device that super continuous spectrums are produced |
| CN106848809A (en) * | 2017-03-06 | 2017-06-13 | 李志远 | A kind of generation is visible to infrared band pole broadband, the device of super continuous laser |
| CN110277725A (en) * | 2019-07-15 | 2019-09-24 | 中国人民解放军国防科技大学 | Supercontinuum generation method and device with spectral distribution not changing with power |
| CN112997113A (en) * | 2018-11-01 | 2021-06-18 | Ofs菲特尔有限责任公司 | Optical fiber-based super-continuum spectrum light source |
| CN115313130A (en) * | 2022-07-22 | 2022-11-08 | 北京工业大学 | 2-5 mu m wide spectrum optical fiber light source based on holmium-doped indium fluoride optical fiber |
| CN117543319A (en) * | 2024-01-09 | 2024-02-09 | 北京工业大学 | Mid-infrared rear spectrum enhancement broadband laser system |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105849986A (en) * | 2013-10-30 | 2016-08-10 | 马克斯·普朗克科学促进学会 | Supercontinuum system with microstructured photonic crystal fibers based on fluoride glass |
| CN103825164A (en) * | 2013-12-03 | 2014-05-28 | 上海交通大学 | High average power full optical fiber intermediate infrared supercontinuum light source |
| CN106253042B (en) * | 2016-10-21 | 2023-04-25 | 陕西师范大学 | Broadband tunable pulse fiber laser based on supercontinuum light source |
| CN106253042A (en) * | 2016-10-21 | 2016-12-21 | 陕西师范大学 | Broadband based on super continuum source is tunable pulse optical fiber |
| CN106848809A (en) * | 2017-03-06 | 2017-06-13 | 李志远 | A kind of generation is visible to infrared band pole broadband, the device of super continuous laser |
| CN106842762A (en) * | 2017-04-20 | 2017-06-13 | 陕西师范大学 | It is a kind of to cascade the device that super continuous spectrums are produced |
| CN106842762B (en) * | 2017-04-20 | 2022-12-06 | 陕西师范大学 | Device for generating cascade supercontinuum |
| CN112997113A (en) * | 2018-11-01 | 2021-06-18 | Ofs菲特尔有限责任公司 | Optical fiber-based super-continuum spectrum light source |
| CN110277725A (en) * | 2019-07-15 | 2019-09-24 | 中国人民解放军国防科技大学 | Supercontinuum generation method and device with spectral distribution not changing with power |
| CN110277725B (en) * | 2019-07-15 | 2024-02-02 | 中国人民解放军国防科技大学 | Supercontinuum generation method and device with spectral distribution unchanged with power |
| CN115313130A (en) * | 2022-07-22 | 2022-11-08 | 北京工业大学 | 2-5 mu m wide spectrum optical fiber light source based on holmium-doped indium fluoride optical fiber |
| CN115313130B (en) * | 2022-07-22 | 2024-04-23 | 北京工业大学 | 2-5 Mu m wide spectrum optical fiber light source based on holmium-doped indium fluoride optical fiber |
| CN117543319A (en) * | 2024-01-09 | 2024-02-09 | 北京工业大学 | Mid-infrared rear spectrum enhancement broadband laser system |
| CN117543319B (en) * | 2024-01-09 | 2024-03-15 | 北京工业大学 | Mid-infrared rear spectrum enhancement broadband laser system |
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Application publication date: 20130911 |