CN1624504A - Neodymium ion doped single mould photon crystal optical fiber and method of regulating luminous spectrum - Google Patents
Neodymium ion doped single mould photon crystal optical fiber and method of regulating luminous spectrum Download PDFInfo
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- CN1624504A CN1624504A CN 200410093026 CN200410093026A CN1624504A CN 1624504 A CN1624504 A CN 1624504A CN 200410093026 CN200410093026 CN 200410093026 CN 200410093026 A CN200410093026 A CN 200410093026A CN 1624504 A CN1624504 A CN 1624504A
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- optical fiber
- glass
- neodymium ion
- cladding region
- ion doped
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Abstract
A neodymium ion doping single mode photon crystal optical fiber and method for adjusting luminescence spectrum are disclosed, whose basic structure comprises of fiber core area, inner and outer packaging layer. The fiber core area comprises of average glass doping with neodymium ion; the inner packaging layer is formed by periodical arrange of multiple layer of transparent average cylindrical material along the cross section of optical fiber in another transparent average glass; the outer packaging layer is formed by the third transparent average glass; refractive index n1 of the fiber core area material is equal to refractive index n2 of the glass surrounding the cylindrical material in the inner packaging layer, and refractive index n4 of the glass of outer packaging layer is only lager than refractive indexn3 of the transparent average cylindrical material in the inner packaging layer. The main point of the invention using crystaloptical fiber adjusting and controlling luminescence spectrum is to adjust the angle between axial line and optical axis of pumping light entering into the new luminescence spectrum is acquired.
Description
Technical field
The present invention relates to crystal optical fibre, the method for particularly a kind of neodymium ion doped single mould photon crystal optical fiber and adjustment luminescent spectrum.The variation (pump light is with respect to the shaft axis of optic fibre angle) with the pump light incident angle in this optical fiber of neodymium ion luminescent spectrum is adjustable.
Background technology
Modern development of fiber technology has promoted the development of fiber amplifier and fiber laser.Rear-earth-doped Active Optical Fiber is widely used in light amplification and laser field.Traditional Active Optical Fiber roughly has common step change type and double-contracting stratotype.In fiber laser and the fiber amplifier application, single-mode fiber is better than multimode optical fiber.But traditional optical fiber can support that the wave band of single mode running is narrow.Usually can make that single mode running wave band broadens by the diameter that reduces fibre core, still, can make optical fiber be easy to generate the luminous power that non-linear effect causes carrying like this and reduce significantly.In addition, emission wavelength that the traditional rare earth Active Optical Fiber can be used or luminous wave band are fewer, the groundwork medium has the erbium ion-doped optical fiber that works in optical communication window (C+L wave band), works in the neodymium ion doped optical fiber of 1064nm and the ytterbium ion doped fiber of 1046nm.Although what work in the thulium doped fiber of optical communication window S-band and O wave band in addition mixes praseodymium optical fiber, they all are based on multicomponent glass, such as fluoride glass, and chalcogenide glass, tellurate glass etc., its application prospect is restricted.
Overcome a difficult problem of utilizing traditional fiber can not keep the light signal single mode in than broadband has found solution in recent years along with the invention of big core diameter effective refractive index type photonic crystal fiber hope (Knight J C, Birks T A, Russell P St J, and Atkin D M 1996 Opt.Lett.21 1547, patent publication No. CN 1269020A).Photonic crystal fiber is made up of fibre core and the covering that includes the air column of orderly arrangement.In effective refractive index type photonic crystal fiber, airport has reduced the effective refractive index of covering, thereby light can be limited in the higher relatively fibre core of refractive index by total reflection mechanism and propagate.This photonic crystal fiber has many character that traditional fiber does not have, such as, wavelength band single mode transport ceaselessly, big die face is long-pending, anomalous dispersion etc.So-called wavelength band single mode transport ceaselessly is meant and keeps single mode when the light of any wavelength in optical wavelength range transmits in photonic crystal fiber.Ceaselessly wavelength band single mode transport and long-pending these character of big die face make active doped photon crystal optical fiber to be applied to easily in high power single mode fiber laser and the fiber amplifier and remove (J.Limpert, T.Schreiber, S.Nolte, H.Zellmer, A.T ü nnermann, etc.Opt.Exp.11 818).
Although the appearing as of photonic crystal fiber solves the double-barreled question of single mode and big core diameter valid approach is provided,, existing can practical wavelength and the photonic crystal fiber of wave band still can not satisfy the growing needs of laser instrument and amplifier region.Mainly contain the ytterbium-doped double-cladded-layer photonic crystal fiber, the er-doped photonic crystal fiber, and the neodymium-doped photonic crystal fiber etc., above-mentioned rare earth ion at the luminescent spectrum in these optical fiber with respect to for the luminescent spectrum in the traditional fiber, glow peak position and each luminous peak-to-peak relative intensity do not have significant change, thereby are difficult to be used for developing the laser instrument of the operation wavelength that makes new advances and the amplifier of new service band.
Summary of the invention
Purpose of the present invention will overcome above-mentioned the deficiencies in the prior art exactly, the method of a kind of neodymium ion doped single mould photon crystal optical fiber and regulation and control luminescent spectrum is provided, utilize photonic crystal fiber of the present invention, under specific pumping condition, by changing the angle that pump light is coupled into optical fiber, on the basis of broadband single mode running that keeps optical fiber and the long-pending character of big die face, realization is regulated and control the fluorescence radiation behavior of fibre core doping neodymium ion, and the intensity of each emission main peak is suppressed or strengthens.Particularly be exactly the sandwich construction that designs this optical fiber, make the optical fiber of this structure be positioned near the 1.064 μ m can restraining the trivalent neodymium ion under certain pumping condition
4F
3/2→
4I
11/2The highest peak of transition band, and with near the 0.90 μ m
4F
3/2→
4I
9/2It is highest peak that the fluorescence peak of transition band strengthens, and the angle of adjusting incident light realizes that wide region is tunable; Equally also can with
4F
3/2→
4I
15/2It is highest peak that the very weak fluorescence peak of transition strengthens; In addition can with
4F
3/2→
4I
11/2With
4F
3/2→
4I
13/2Near the peak position of (being positioned at 1330) emission band is adjusted to magnetic tape trailer; In addition can so that
4F
3/2→
4I
13/2The fluorescence bandwidth of transition broadens, and it is flat that fluorescence intensity becomes.
Technical solution of the present invention is as follows:
A kind of neodymium ion doped single mould photon crystal optical fiber, its basic structure is made up of core region and inner cladding region and outer cladding region, core region is made up of neodymium ion doped transparent uniform glass, inner cladding region is formed along cross section of optic fibre periodic arrangement in the transparent uniform glass of another kind by the even cylindric material of multi-layer transparent, outer cladding region is made up of the third transparent uniform glass, the refractive index n of described core region material
1Equal to surround in the inner cladding region refractive index n of the transparent uniform glass of cylinder material
2, the refractive index n of the transparent uniform glass of outer cladding region
4Only greater than the refractive index n of the transparent even cylindric material in the inner cladding region
3
Being shaped as of described core region is cylindric, and diameter is not less than 30 microns.
Described fibre core occupies the position of a cylindric material at least.
The arrangement mode of described cylindric material in the transparent uniform glass of inner cladding region is the hexangle type periodic arrangement.
The diameter of the cylindric material of described inner cladding region is no more than 4 microns.
The post heart of adjacent two cylindric materials is no more than 15 microns to the distance between the post heart in the described inner cladding region.
The cylindric material of described inner cladding region is a water, or liquid crystal, or the transparent uniform glass of low-refraction.
The transparent uniform glass that described inner cladding region surrounds cylindric material be the doping neodymium ion form the same glass with glass of fiber core.
The refractive index n of the transparent uniform glass of described outer cladding region
4Only greater than the refractive index n of the transparent even cylindric material (3) in the inner cladding region
3
Utilize the method for described neodymium ion doped single mould photon crystal optical fiber regulation and control luminescent spectrum, its key is to adjust optical axis and the angle of this shaft axis of optic fibre and the power of the pump light that injects this fiber end face of the pump light that injects this fiber end face, can obtain new luminescent spectrum.
Gordian technique of the present invention be to transmit optical radiation optical fiber structure and adopt special pump light coupling scheme.
The pump light coupling scheme that the present invention adopts are that pump light focuses on fiber end face with angle of inclination (pump light is with respect to the angle of shaft axis of optic fibre) and carries out pumping after micro-focusing system focuses on.
Technique effect of the present invention:
Optical fiber of the present invention both can have been realized the long-pending and single mode transport of big die face, can expand the operation wavelength and the wave band that make new advances again, developed the fiber laser of the fiber amplifier of more transmission wave band and high power, multi-wavelength, broad tuning.
Description of drawings
Fig. 1 is a cross section of optic fibre synoptic diagram of the present invention.
Fig. 2 is the pump light coupling optical path figure of optical fiber of the present invention.
Fig. 3 be first embodiment of the invention optical fiber under 808 Nano semiconductor laser pump (ing)s, the emission spectrum under the different angles.
Fig. 4 be first embodiment of the invention optical fiber under 808 Nano semiconductor laser pump (ing)s, the fluorescence intensity at emerging three peaks is with the contrast of the situation of change of angle in the emission spectrum.
Embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is further described, but should limit protection scope of the present invention with this.
With reference to figure 1, Fig. 1 is a cross section of optic fibre synoptic diagram of the present invention.As seen from the figure, optical fiber of the present invention is made up of four parts, comprise the core region of being made up of neodymium ion doped transparent uniform glass 1, transparent even cylindric material 3 is arranged in inner cladding that forms in the another kind of transparent uniform glass 2 and the surrounding layer of being made up of the third transparent uniform glass 4 along cross section of optic fibre.The refractive index n of core region 1 material
1Greater than the refractive index n that surrounds column material 3 in the inner cladding region
3Refractive index n with transparent uniform glass 2
2, the refractive index n of the transparent uniform glass of outer cladding region 4
4Only greater than the refractive index n of the transparent even columnar material 3 in the inner cladding region
3When the ratio of the diameter of the cylindric material 3 of inner cladding region and minimum intercolumniation during less than certain constant value, optical fiber satisfies the condition of single mode running in than broadband.
With reference to figure 2, Fig. 2 is the pump light coupling optical path figure of optical fiber of the present invention.Utilize the method for described neodymium ion doped single mould photon crystal optical fiber regulation and control luminescent spectrum, its key is to adjust optical axis and the angle of this shaft axis of optic fibre and the power of the pump light that injects this fiber end face of the pump light that injects this fiber end face, to obtain new luminescent spectrum.After the 808nm wavelength laser that semiconductor laser instrument 5 sends among the figure focuses on through micro-focusing system 6, its beam axis and shaft axis of optic fibre are the end face that an inclination angle focuses on optical fiber 7, focal beam spot concentrates on the end region of fibre core 8, and the fluorescence that is sent is received detection by fluorescence spectrophotometer 9.
Embodiment 1
Selecting refractive index for use is 1.514 and 1.487 neodymium ion doped and unadulterated silicate glass.Wherein doping is 3.6wt%, and these glass are through machine cuts, and polishing obtains the long 200mm that is after the polishing, and diameter is the silicate glass rod of 20mm.Then, the method with machine drilling in the middle of these glass bars gets out the through hole that diameter is 8mm, forms glass tube.Utilize common fiber-pulling machine that these glass tubes are drawn into external diameter and be 1mm, internal diameter is the kapillary of 0.4mm.Be the porous structure of 12mm with neodymium ion doped kapillary 3 manual diameters of being piled into the hexangle type arrangement wherein then, wherein Zhong Jian 7 capillaries are the alternative fibre core 1 of doing of solid neodymium ion doped glass bar of 3mm with a diameter.Putting an internal diameter again in the outside of this porous structure then is 12mm, and external diameter is the undoped silicate glass tube 4 of 21mm.This outer casing glass tube 4 has the temperature close with doped-glass-viscosity to be changed, thermal expansivity and glass transformation temperature, thereby very mate.Utilize common fiber drawing tower, the external diameter that finally can obtain hundreds of rice length is 250 μ m, and core diameter is 36 μ m, and bore dia is 4 μ m, and pitch of holes is the optical fiber of 10.6 μ m.
Measure showing that with the pattern analysis instrument this optical fiber is the support single mode transport at 660nm to the 1400nm wave band at least, is Gaussian distribution in the intensity distributions of end face.
On device shown in Figure 2, under the exciting of the semiconductor laser of 808nm, measure by regulating the angle that pump light is coupled into optical fiber.Its result as shown in Figure 3 and Figure 4.
Fig. 3 be present embodiment optical fiber under 808 nanometer laser pumpings, the emission spectrum under the different angles.When pump light increases with respect to the angle of shaft axis of optic fibre, the emission peak of 1136nm appears at the tail end of 1062nm emission band, and simultaneously, be that wavelength also to have occurred be the emission peak of 1294nm and 1384nm for the front-end and back-end of the emission band at center at 1330nm.
Fig. 4 is the contrast of the intensity at these three peaks with the situation of change of angle, find, at the peak at 1384nm place along with the variation peak change of angle is very big, when 18 ° of angles, intensity has surpassed 1.3 times of the intensity of the main peak at 1062nm place, and the amplitude of variation at other two new peaks is little.
Embodiment 2
Selecting refractive index for use is 1.543 and 1.513 neodymium ion doped (doping is 3.6wt%) and the block glass of doping phosphoric acid salt not.200mm is grown in these glass processings, and diameter is the phosphate glass rod of 20mm.Method with machine drilling in the middle of glass bar gets out the through hole that diameter is 6mm, forms glass tube.Utilize common fiber-pulling machine that these glass tubes are drawn into external diameter and be 1mm, internal diameter is the kapillary of 0.3mm.Neodymium ion doped glass capillary that then will be wherein is manual, and to be piled into the external diameter that hexangle type arranges be the porous structure of 12mm, and wherein Zhong Jian 7 capillaries are that the solid doped glass rod of 3mm is alternative with a diameter.Putting an internal diameter again in the outside of this porous structure then is 12mm, and external diameter is the not Doping Phosphorus hydrochlorate glass tube 4 of 18mm.This outer casing glass tube 4 has the temperature close with doped-glass-viscosity and changes thermal expansivity and glass transformation temperature.Utilize common fiber drawing tower, the external diameter that finally can obtain hundreds of rice length is 180 μ m, and core diameter is 30 μ m, and bore dia is 2.5 μ m, and pitch of holes is the optical fiber of 9.5 μ m.
Use pattern analysis instrument (BeamView Analyzer
EM(Coherent Inc.)) pattern of measuring this optical fiber learns that this optical fiber is to support single mode transport at 408nm to the 1400nm wave band at least, is distributed as Gaussian distribution in the mode intensity of end face.
Adopt 808nm laser, from end face one section 1 meter long optical fiber is carried out pumping, the light signal of other end outgoing is received by spectrometer.When 808nm laser during with the angle incident of tilting (with respect to shaft axis of optic fibre), find, since 5 degree angles, be that the long wavelength of the emission band at center brings out that to have showed wavelength be the emission peak of 1396nm with 1330nm.Especially, when incident angle continues to increase to 22 when spending, the intensity of new emission peak also increases, and finally in the intensity of the emission peak at 1396nm place even surpassed the intensity at 1055nm place, is 1.3 times of this peak.In the process that the emission peak at this external 1396nm place strengthens, the intensity that is positioned near the fluorescence peak the 900nm also constantly strengthens, and finally reaches 2.4 times of fluorescence peak of 1055nm place and becomes highest peak.
Embodiment 3
Adopting refractive index is 1.453 and 1.448 the quartzy block glass (doping is 1000ppm) of doping and the quartzy block glass that do not mix.200mm is grown in these quartz glass processing, and diameter is the glass bar of 20mm.Method with machine drilling in the middle of some doped glass rods gets out the through hole that diameter is 4mm, forms glass tube.Utilize common fiber-pulling machine that these glass tubes are drawn into external diameter and be 1mm, internal diameter is the kapillary of 0.2mm.Be piled into the porous structure that hexangle type is arranged with these kapillaries are manual then, wherein Zhong Jian 7 capillaries are that the solid doped glass rod of 3mm is alternative with a diameter.Putting an internal diameter again in the outside of this porous structure then is 12mm, and external diameter is the not doped silica glass pipe 4 of 23mm.This outer casing glass tube 4 has the temperature close with doped-glass-viscosity and changes thermal expansivity and glass transformation temperature.Utilize common fiber drawing tower, the precessional evlocity of balance prefabricated rods and wire-drawing temperature, the external diameter that finally can obtain hundreds of rice length are 250 μ m, and core diameter is 38 μ m, and bore dia is 1.9 μ m, and pitch of holes is the optical fiber of 15 μ m.
Use pattern analysis instrument (BeamView Analyzer
EM(Coherent Inc.)) pattern of measuring this optical fiber learns that this optical fiber is to support single mode transport at 408nm to the 1400nm wave band at least, is distributed as Gaussian distribution in the mode intensity of end face.
Adopt 808nm laser, from end face one section 1 meter long optical fiber is carried out pumping, the light signal of other end outgoing is received by spectrometer.When 808nm laser during with the angle incident of tilting (with respect to shaft axis of optic fibre), find, since 7 degree angles, with 1330nm be the center emission band become flat, the fluorescence bandwidth broadens, when incident angle continues to increase to 17 degree during angles, the bandwidth of this emission band can reach 150nm, from 1280nm up to 1435nm.In addition, corresponding to
4F
3/2→
4I
15/2The peak strength of the 1830nm emission band of transition has surpassed
4F
3/2→
4I
11/2The intensity at transition 1064nm place, for the 1064nm peak intensity 1.8 times become highest peak.
Claims (10)
1, a kind of neodymium ion doped single mould photon crystal optical fiber, the basic structure that it is characterized in that it is by core region (1) and inner cladding region (2,3) and outer cladding region (4) form, core region (1) is made up of neodymium ion doped transparent uniform glass, inner cladding region is formed along cross section of optic fibre periodic arrangement in the transparent uniform glass of another kind (2) by the even cylindric material of multi-layer transparent (3), outer cladding region (4) is made up of the third transparent uniform glass, the refractive index n of core region (1) material
1Equal to surround in the inner cladding region refractive index n of the transparent uniform glass (2) of cylinder material (3)
2, the refractive index n of the transparent uniform glass of outer cladding region (4)
4Only greater than the refractive index n of the transparent even cylindric material (3) in the inner cladding region
3
2, neodymium ion doped single mould photon crystal optical fiber according to claim 1 is characterized in that being shaped as of described core region (1) is cylindric, and diameter is not less than 30 microns.
3, neodymium ion doped single mould photon crystal optical fiber according to claim 1 is characterized in that described fibre core (1) occupies the position of a cylindric material (3) at least.
4, neodymium ion doped single mould photon crystal optical fiber according to claim 1 is characterized in that the arrangement mode of described cylindric material (3) in the transparent uniform glass of inner cladding region is the hexangle type periodic arrangement.
5, neodymium ion doped single mould photon crystal optical fiber according to claim 1 is characterized in that the diameter of the cylindric material of described inner cladding region (3) is no more than 4 microns.
6, neodymium ion doped single mould photon crystal optical fiber according to claim 1 is characterized in that the post heart of described inner cladding region (2,3) adjacent two cylindric materials (3) is no more than 15 microns to the distance between the post heart.
7, neodymium ion doped single mould photon crystal optical fiber according to claim 1 is characterized in that the cylindric material (3) of described inner cladding region is a water, or liquid crystal, or the transparent uniform glass of low-refraction.
8, neodymium ion doped single mould photon crystal optical fiber according to claim 1 is characterized in that transparent uniform glass (2) that described inner cladding region surrounds cylindric material (3) forms the same glass for the doping neodymium ion with glass of fiber core (1).
9, neodymium ion doped single mould photon crystal optical fiber according to claim 1 is characterized in that the refractive index n of the transparent uniform glass of described outer cladding region (4)
1Only greater than the refractive index n of the transparent even cylindric material (3) in the inner cladding region
3
10, utilize the method for the described neodymium ion doped single mould photon crystal optical fiber regulation and control of claim 1 luminescent spectrum, its key is to adjust optical axis and the angle of this shaft axis of optic fibre and the power of the pump light that injects this fiber end face of the pump light that injects this fiber end face, to obtain new luminescent spectrum.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107533192A (en) * | 2015-04-14 | 2018-01-02 | 日本电信电话株式会社 | Photonic crystal fiber |
| CN110989071A (en) * | 2014-03-25 | 2020-04-10 | Nkt光子学有限公司 | Microstructured optical fiber and supercontinuum light source |
| CN114180835A (en) * | 2021-11-08 | 2022-03-15 | 宁波大学 | Rare earth doped glass with ultra-wideband near-infrared fluorescence emission and preparation method and application thereof |
| CN114675368A (en) * | 2022-03-10 | 2022-06-28 | 闽江学院 | Photonic crystal fiber and preparation method thereof |
-
2004
- 2004-12-15 CN CN 200410093026 patent/CN1624504A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110989071A (en) * | 2014-03-25 | 2020-04-10 | Nkt光子学有限公司 | Microstructured optical fiber and supercontinuum light source |
| CN110989071B (en) * | 2014-03-25 | 2022-04-08 | Nkt光子学有限公司 | Microstructured optical fiber and supercontinuum light source |
| US11619778B2 (en) | 2014-03-25 | 2023-04-04 | Nkt Photonics A/S | Source of supercontinuum radiation and microstructured fiber |
| CN107533192A (en) * | 2015-04-14 | 2018-01-02 | 日本电信电话株式会社 | Photonic crystal fiber |
| CN107533192B (en) * | 2015-04-14 | 2020-10-23 | 日本电信电话株式会社 | Photonic crystal fiber |
| CN114180835A (en) * | 2021-11-08 | 2022-03-15 | 宁波大学 | Rare earth doped glass with ultra-wideband near-infrared fluorescence emission and preparation method and application thereof |
| CN114675368A (en) * | 2022-03-10 | 2022-06-28 | 闽江学院 | Photonic crystal fiber and preparation method thereof |
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