CN102385104A - Photonic bandgap fiber (PBGF) and frequency-shifted fiber laser - Google Patents
Photonic bandgap fiber (PBGF) and frequency-shifted fiber laser Download PDFInfo
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- CN102385104A CN102385104A CN2011103087018A CN201110308701A CN102385104A CN 102385104 A CN102385104 A CN 102385104A CN 2011103087018 A CN2011103087018 A CN 2011103087018A CN 201110308701 A CN201110308701 A CN 201110308701A CN 102385104 A CN102385104 A CN 102385104A
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Abstract
The invention is applicable to the technical fields of optical fiber and fiber lasers, and provides photonic bandgap fiber (PBGF). The PBGF comprises a cladding layer and a fiber core wrapped in the cladding layer, wherein, the internal cladding layer is formed by a ring composed of large air holes, and the internal cladding layer contains germanium (Ge)-doped glass wires; and the fiber core contains a fluorine (F)-doped area with low refractive index. In the invention, slight refractive index subsidence is applied to the fiber core of the all-solid-state PBGF, which effectively enhances resonance coupling between a mode field and the Ge-doped glass wires in a 'loss zone' and further reduces the number of the Ge-doped glass wires in the cladding layer and absorption of the glass wires in the cladding layer on pump light.
Description
Technical field
The invention belongs to the optical fiber technology field, relate in particular to a kind of photon band-gap optical fiber and shift frequency fiber laser.
Background technology
" shift frequency fiber laser " research based on photonic band gap effects is the forward position research topic in current fiber laser field.Usually the output wavelength of ytterbium-doping optical fiber laser is between 1000-1120nm, and people are difficult to obtain high power " shift frequency " the laser output of 976nm or 1120-1180nm.Yet the fiber laser very attractive of latter two wavelength, their frequencys multiplication are a kind of new technological approaches that produces blue light and gold-tinted laser.Even find in the research to force frequency-selecting with the optical fiber grating pair, near the also difficult parasitic laser of 1060nm of eliminating, this is by the fluorescence gain spectral decision of ytterbium ion after all.Therefore make high-power " shift frequency fiber laser ", key is to revise the fluorescence gain spectral of rare earth ion, realizes the laser excitation of weak gain band through suppressing the strong wave band of gain.
Wherein, All solid state photon band-gap optical fiber is a kind of novel optical fiber of broad research in recent years; It mixes the formed photonic band gap effects of germanite glass linear array by means of high index of refraction in the covering; (annotating: also have paper to be referred to as " antiresonance reflection Waveguide Mechanism ", be abbreviated as ARROW), the photon that will be in the band gap is limited in real in-core transmission.Between adjacent band gap, have one " loss region ", very big in its inner photon loss, be because on these wavelength in the fibre core guided modes with mix the high-order mode generation resonance coupling in the germanite glass line.Utilize photonic band gap effects can change the fluorescence gain spectral of rare earth ion, principle is: with the strong gain region of " loss region " design in fluorescence Spectra, just can effectively suppress parasitic laser, help improving the power of " shift frequency fiber laser ".
At the complete real in-core of photon band-gap optical fiber admittedly, can carry out rear-earth-doped, grating and write.Say from technological layer,, can also revise the fluorescence spectrum scope of ytterbium ion through the winding radius that changes optical fiber even the precision of optical fiber fabrication technology can not reach the frequency shift amount of ideal design fully.Because the band gap width of optical fiber reduces along with twining reduced radius, the winding radius ability " appropriateness " that changes optical fiber changes the width of band gap/" loss region ".But the optical fiber power and the conversion efficiency that are based on single cladding structure that above-mentioned principle realizes are all very low, and the optical fiber peak power of double clad structure also has only 30W.
At present, restricting the main bottleneck that this type of " shift frequency fiber laser " power further promotes is: 1) height mix ytterbium entirely admittedly photon band-gap optical fiber be difficult to realize the big mode field area design.Because to the weak gain region of fluorescence Spectra, optical fiber must height be mixed ytterbium ion just can provide laser operation required enough gains to laser by shift frequency.And the high ytterbium of mixing can also strengthen the limitation capability to the mould field by corresponding raising fiber core refractive index; Certainly will need conversely to mix the germanite glass line in the covering more near fibre core; Suppress strong gain region so that stronger resonance coupling formation " loss region " takes place, this has limited mode field area and has become big.2) high index of refraction that contains in the fibre cladding is mixed the germanite glass line can catch the part pump light, causes reducing the light light conversion efficiency, thereby people expect with few glass thread of trying one's best photonic band gap effects to be provided in actual fiber is made.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of photon band-gap optical fiber, is intended to utilize photonic band gap effects to suppress the parasitic laser of strong gain region.
The present invention is achieved in that a kind of photon band-gap optical fiber, the ring-type inner cladding that comprises surrounding layer, formed by some airports, is wrapped in the fibre core in the said inner cladding, includes in the said inner cladding and mixes the germanite glass line, mixes fluorine in the said fibre core.
The present invention also provides a kind of shift frequency fiber laser, comprises bundling device, first fiber grating, first photon band-gap optical fiber, high Yb dosed optical fiber, second photon band-gap optical fiber, second fiber grating of welding in order;
Said first photon band-gap optical fiber and said second photon band-gap optical fiber are aforesaid photon band-gap optical fiber;
The reflection wavelength of said first fiber grating and said second fiber grating is identical but reflectivity different.
The present invention also provides a kind of gold-tinted fiber laser, comprises as stated a shift frequency fiber laser, comprises that also laser that a pair of said shift frequency fiber laser produces carries out the frequency multiplier of process of frequency multiplication;
Wherein, The pumping source welding of the input end of said bundling device and a 976nm; The reflected wavelength range of said first fiber grating and said second fiber grating is 1150nm-1180nm; Said first fiber grating sees through and high anti-to the light in its reflected wavelength range the pump light of 976nm is high, and said second fiber grating can reflect the light in its reflected wavelength range.
The present invention also provides a kind of Blue-light optical fiber laser, comprises as stated a shift frequency fiber laser, comprises that also laser that a pair of said shift frequency fiber laser produces carries out the frequency multiplier of process of frequency multiplication;
Wherein, The pumping source welding of the input end of said bundling device and a 915nm; The reflection wavelength of said first fiber grating and said second fiber grating is 976nm, and said first fiber grating is high anti-to the light of 976nm, and said second fiber grating can reflect the light of 976nm.
First kind of photon band-gap optical fiber provided by the invention sink through in the fibre core of all solid state photon band-gap optical fiber, applying a slight refractive index; Effectively strengthen " loss region " internal mold field and the resonance coupling of mixing the germanite glass line; And then mix the number of germanite glass line in the minimizing covering; Reduced that glass thread is to the absorption of pump light in the covering, above-mentioned photon band-gap optical fiber can be applicable to the shift frequency fiber laser, can effectively stop to mix in the covering absorption waste of germanite glass line to pump light.Utilize the effect of right frequency-selecting effect of fiber grating and photon band-gap optical fiber " suppressing parasitic laser generation ", realize full fiberize high-power " shift frequency fiber laser ".
Description of drawings
Fig. 1 is the end section structural drawing of the photon band-gap optical fiber that provides of the embodiment of the invention;
Fig. 2 is the evolution synoptic diagram that structure photon band-gap optical fiber shown in Figure 1 adds the mould field, back of sinking;
Fig. 3 is the structural drawing that adopts the shift frequency fiber laser of photon band-gap optical fiber realization shown in Figure 1.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The present invention mixes in reducing covering under the prerequisite of germanite glass rod number from the revised theory of photonic band gap effects to ytterbium ion fluorescence gain spectral, realizes the design of big mould field photon band-gap optical fiber.
The photon band-gap optical fiber that the embodiment of the invention provides comprises surrounding layer, inner cladding and fibre core; Wherein inner cladding is formed by some airports and contains and mixes the germanite glass line; Fibre core is wrapped in inner cladding inside and mixes fluorine; Fig. 1 shows the end section structure of the photon band-gap optical fiber that the embodiment of the invention provides, and wherein regional A represents fibre core, and area B is represented the part of mixing the germanite glass line in the inner cladding.
Through in fibre core, suitably mixing fluorine, form refractive index " bogging down area ", radius and " degree sink " through optimizing bogging down area can become similar flat-top shape by gaussian-shape with mould field shape, and energy is pushed to the outside by " bogging down area ", and mould field shape is as shown in Figure 2.The photon band-gap optical fiber that this fibre core is mixed fluorine more is prone to and mixes germanite glass line resonance coupling and realize the long-pending design of big die face.This design simultaneously can significantly reduce the number of mixing the germanite glass line in the covering, reduces its absorption to pump light.Only use 6 germanite glass lines in the covering, shown in the area B among Fig. 1, for strengthening the restriction to photon in the band gap, the germanite glass line adds one deck and mixes fluorine glass simultaneously.Other roundlet in the structural drawing in the covering can be airport, also can be low-refraction and mixes fluorine glass.
The shift frequency fiber laser of Fig. 3 for adopting photon band-gap optical fiber shown in Figure 1 to realize, the length of the reflectivity of output terminal fiber grating, photon band-gap optical fiber and common Yb dosed optical fiber realizes optimization through Design Theory and experiment.Output spectrum, beam quality and power characteristic are measured with OSA, beam quality analyser and power meter respectively.
Shift frequency fiber laser shown in Figure 3 comprises bundling device 41, first fiber grating 42, first photon band-gap optical fiber 43 of welding in order, high Yb dosed optical fiber 44, second photon band-gap optical fiber 45, second fiber grating 46; Wherein, Bundling device 41 and pumping source welding; As adopt the pumping source of LD (semiconductor laser) type, and first photon band-gap optical fiber 43 and second photon band-gap optical fiber 45 are photon band-gap optical fiber mentioned above.
Above-mentioned shift frequency fiber laser can be used for the light of different colours, specifically can be through selecting each device suitable parameters realization among Fig. 3 for use.
For the gold-tinted fiber laser of realizing through above-mentioned fiber laser; Device frequently needs on the basis of Fig. 3, to double; This frequency multiplier is used for the laser that the shift frequency fiber laser produces is carried out process of frequency multiplication; This frequency multiplier of the direct welding in second fiber grating, 46 places that specifically can be in Fig. 3, and the pump light of the pumping source of the input end welding of requirement and bundling device 41 is 976nm, and the reflected wavelength range of first fiber grating 42 and said second fiber grating 46 is 1150nm-1180nm; The pump light height of 42 couples of 976nm of first fiber grating sees through and is high anti-to the light in its reflected wavelength range; Second fiber grating 46 can reflect the light in its reflected wavelength range, and for example the light with 1180nm is example, high the seeing through of the pump light of 42 couples of 976nm of first fiber grating and be high anti-to 1180nm; 46 of second fiber gratings can reflect 1180nm, are 20% such as reflectivity, can realize the fiber laser of 1180nm like this.Wherein, The effect of photon band-gap optical fiber is the fluorescent radiation that is used for being suppressed between the 1.03um-1.15um; It is high loss to the optical wavelength of this scope, and is that height sees through for the wavelength after the 1.15um, thereby can realize the frequency of fiber laser is moved on to long wavelength's one end.Further utilize frequency multiplier (like frequency-doubling crystal LBO) then optical sccond-harmonic generation is realized the gold-tinted output of 590nm again.
For the Blue-light optical fiber laser of realizing through above-mentioned fiber laser; Need increase by on the basis of Fig. 3 is used for the laser that the shift frequency fiber laser produces is carried out the frequency multiplier of process of frequency multiplication equally; This frequency multiplier also can with second fiber grating, the 46 direct weldings among Fig. 3; Require light 915nm this moment with the pumping source of the input end welding of bundling device; The reflection wavelength of first fiber grating 42 and second fiber grating 46 is 976nm, and the light of 42 couples of 976nm of first fiber grating is high anti-, and the light of 46 couples of 976nm of second fiber grating can reflect.This moment first fiber grating 42 couples of 976nm the high reflection of light, 46 of second fiber gratings only can reflect 976nm's, are 20% such as reflectivity.Can utilize the effect of photon band-gap optical fiber equally, make emitted laser at 976nm.And the fiber laser of 976nm finally can arrive 488nm with optical sccond-harmonic generation through frequency-doubling crystal such as LBO, realizes blue light output.
To " bottleneck " problem that present shift frequency fiber laser power is difficult to promote, the scheme of laser instrument provided by the invention can stop to mix the covering absorption of germanite glass line to pump light from principle.And this shift frequency fiber laser is with photon band-gap optical fiber and ytterbium optic fibre separation; Mix the germanite glass line and in covering, be not communicated with, in the band gap fiber before ytterbium optical fiber, mix the germanite glass line and pump light is absorbed in any case all it doesn't matter; Because finally also be injected in the inner cladding of ytterbium optical fiber; And at the photon band-gap optical fiber of rear end, absorbed by the fibre core of Yb dosed optical fiber because pump light is most of, its absorption is by reduction greatly.In sum; The present invention utilizes the photonic band gap effects of said photon band-gap optical fiber; Realization is to the correction of the spontaneous radiation fluorescence gain spectral of common Yb dosed optical fiber; And make up the shift frequency fiber laser with said photon band-gap optical fiber and common Yb dosed optical fiber, and can change excitation wavelength with the fiber laser of this scheme made, have advantage cheaply.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. a photon band-gap optical fiber is characterized in that, the ring-type inner cladding that comprises surrounding layer, formed by some airports, is wrapped in the fibre core in the said inner cladding, includes in the said inner cladding and mixes the germanite glass line, mixes fluorine in the said fibre core.
2. a shift frequency fiber laser is characterized in that, comprises bundling device, first fiber grating, first photon band-gap optical fiber, high Yb dosed optical fiber, second photon band-gap optical fiber, second fiber grating of welding in order;
Said first photon band-gap optical fiber and said second photon band-gap optical fiber are the described photon band-gap optical fiber of claim 1;
The reflection wavelength of said first fiber grating and said second fiber grating is identical but reflectivity different.
3. a gold-tinted fiber laser is characterized in that, comprises a shift frequency fiber laser as claimed in claim 2, comprises that also the laser of a pair of said shift frequency fiber laser generation carries out the frequency multiplier of process of frequency multiplication;
Wherein, The pumping source welding of the input end of said bundling device and a 976nm; The reflected wavelength range of said first fiber grating and said second fiber grating is 1150nm-1180nm; Said first fiber grating sees through and high anti-to the light in its reflected wavelength range the pump light of 976nm is high, and said second fiber grating can reflect the light in its reflected wavelength range.
4. a Blue-light optical fiber laser is characterized in that, comprises a shift frequency fiber laser as claimed in claim 2, comprises that also the laser of a pair of said shift frequency fiber laser generation carries out the frequency multiplier of process of frequency multiplication;
Wherein, The pumping source welding of the input end of said bundling device and a 915nm; The reflection wavelength of said first fiber grating and said second fiber grating is 976nm, and said first fiber grating is high anti-to the light of 976nm, and said second fiber grating can reflect the light of 976nm.
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Cited By (7)
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| CN102684049A (en) * | 2012-05-10 | 2012-09-19 | 清华大学 | Optical fiber laser device |
| CN103439763A (en) * | 2013-09-13 | 2013-12-11 | 长飞光纤光缆有限公司 | Total solid optical fiber with large-mode field area and manufacturing method thereof |
| CN107621670A (en) * | 2017-10-13 | 2018-01-23 | 北京工业大学 | All solid state antiresonance optical fiber |
| CN111175886A (en) * | 2019-12-31 | 2020-05-19 | 武汉安扬激光技术有限责任公司 | Optical fiber device capable of filtering long wavelength |
| CN111948752A (en) * | 2020-08-04 | 2020-11-17 | 河北工业大学 | Large-mode-field-area dual-mode optical fiber with low bending loss and application thereof |
| DE102020209309A1 (en) | 2020-07-23 | 2022-01-27 | Leibniz-Institut für Photonische Technologien e.V. (Engl.Leibniz Institute of Photonic Technology) | waveguides and fiber lasers |
| CN114740566A (en) * | 2022-03-11 | 2022-07-12 | 中国科学院西安光学精密机械研究所 | Polymer microstructure optical fiber for terahertz wave high-performance imaging and optical fiber image transmission bundle |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684049A (en) * | 2012-05-10 | 2012-09-19 | 清华大学 | Optical fiber laser device |
| CN103439763A (en) * | 2013-09-13 | 2013-12-11 | 长飞光纤光缆有限公司 | Total solid optical fiber with large-mode field area and manufacturing method thereof |
| CN103439763B (en) * | 2013-09-13 | 2015-09-23 | 长飞光纤光缆股份有限公司 | A kind of total solid optical fiber with large-mode field area and manufacture method thereof |
| CN107621670A (en) * | 2017-10-13 | 2018-01-23 | 北京工业大学 | All solid state antiresonance optical fiber |
| CN111175886A (en) * | 2019-12-31 | 2020-05-19 | 武汉安扬激光技术有限责任公司 | Optical fiber device capable of filtering long wavelength |
| DE102020209309A1 (en) | 2020-07-23 | 2022-01-27 | Leibniz-Institut für Photonische Technologien e.V. (Engl.Leibniz Institute of Photonic Technology) | waveguides and fiber lasers |
| CN111948752A (en) * | 2020-08-04 | 2020-11-17 | 河北工业大学 | Large-mode-field-area dual-mode optical fiber with low bending loss and application thereof |
| CN114740566A (en) * | 2022-03-11 | 2022-07-12 | 中国科学院西安光学精密机械研究所 | Polymer microstructure optical fiber for terahertz wave high-performance imaging and optical fiber image transmission bundle |
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Application publication date: 20120321 |