CN100587528C - Gain photon crystal fiber waveguide and its device - Google Patents
Gain photon crystal fiber waveguide and its device Download PDFInfo
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- CN100587528C CN100587528C CN200810224564A CN200810224564A CN100587528C CN 100587528 C CN100587528 C CN 100587528C CN 200810224564 A CN200810224564 A CN 200810224564A CN 200810224564 A CN200810224564 A CN 200810224564A CN 100587528 C CN100587528 C CN 100587528C
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Abstract
The invention relates to a gain photon crystal optical fiber waveguide, which is composed of a core layer and a coating layer which surrounds the core layer. The inner coating layer of the optical fiber comprises a solid microstructure point lattice which is formed by a germanium-doped silica column, and forms an outer band gap of the gain optical fiber, the function thereof is that the multimodepump light can be strictly restricted in a second fiber core region which is provided with rare earth doped ions to improve the utilizing efficiency of the pump light; the second fiber core of the optical fiber is composed of a solid microstructure point lattice which is formed by a rare earth ion silica column to form an inner band gap of the gain optical fiber, the function thereof is that through the multimode pump light, the generated laser light can be strictly restricted in a first fiber core region which is formed by high pure silica glass. Adopting the solid gain photonic crystal optical fiber can greatly improve the utilization efficiency of the pump light, improve beam quality of output laser light, enhance output power of the optical fiber laser, and reduce nonlinear effect of the high-power laser device.
Description
Technical field
The present invention relates to a kind of gain photonic crystal optical waveguides, particularly a kind of rear-earth-doped photon band gap optical waveguide of superpower laser application, and the fiber laser that adopts this gain photonic crystal optical waveguides to make.
Background technology
Along with the develop rapidly of diode-end-pumped and laser coupled homenergic photoelectron technology, high-capacity optical fiber laser obtains unprecedented technical progress.Mix ytterbium, er-doped, erbium and ytterbium codoping, mix thulium, the various novel optical fiber laser instruments of neodymium-doped have obtained widespread use.The multimode pump technology is from initial end pump technical development side pump technology till now, from single pump technical development to multi-pump combination technique; From the incoherent laser coherence technology that develops into; The power of fiber laser also develops into multikilowatt from initial milliwatt level, even the laser power of myriawatt level.The double clad gain fibre provides the otherwise effective technique approach for output power and the conversion efficiency that improves fiber laser, and having changed fiber laser is a kind of history of miniwatt photonic device.Consider factors such as conversion quantum efficiency, threshold for resisting laser damage and substrate loss, mixing the quartzy doubly clad optical fiber of rare earth is the optimal selection that realizes high-capacity optical fiber laser or amplifier.Along with the development of doubly clad optical fiber manufacture craft and high-power semiconductor laser pumping (comprising its beam shaping technology) technology, the output power of single double-clad optical fiber laser progressively improves, and continuous power output has reached multikilowatt.
Therefore, the core component of fiber laser---double clad gain fibre is also developed rapidly: bear laser power for increasing single fiber, improve constantly the mode field diameter of optical fiber, so core diameter develops into more than 50 microns from several micron, stride forward towards hundred micron-sized directions now.The fiber laser that adopts traditional double doped cladding layer ytterbium fibre-optic waveguide to make, its single fiber output laser power has reached 2.2kW.But its output laser beam quality is relatively poor, and the pump power utilization factor is low, and laser stability is poor.
For load power and the spectral characteristic that improves gain fibre, develop the double-clad photon crystal Yb dosed optical fiber of the low fibre core numerical aperture in big mould field again, reported single photonic crystal fiber continuous power output 1.53kW in 2005.The high power thulium-doped fiber laser simple optical fiber that is used for infrared sensing and military weapon has reached 188W.And domestic high-capacity optical fiber laser is at the early-stage in recent years, and speed of development is slower, and main cause is to be subject to external blockade and control to high-performance double clad rare earth doped fiber.
Make a general survey of domestic and international research situation as can be seen, fiber laser constantly develops towards the direction of high-power and high-lighting beam quality, its core key part a pair of doped cladding layer rare earth doped fiber of inevitable requirement improves constantly its laser activity, for this reason, has carried out research work widely both at home and abroad.As seen, the gain photon crystal wave-guide is fit to the application of high-capacity optical fiber laser very much, possesses and uses widely and market outlook.
The conventional double clad gain fibre of the many employings of high-capacity optical fiber laser at present, there is following insoluble technical barrier in this fiber laser, as: enlarging its mode field diameter is one of main path that improves fiber laser carrying laser power, but increasing mode field diameter can bring some negative effects such as beam quality to descend, problems such as bending loss increase, conventional double clad gain fibre just increases the mode field diameter of optical fiber for the laser load power that improves optical fiber, in order to guarantee beam quality, have to reduce the numerical aperture of fiber core again, not only cause bigger difficulty to technology, and this technology nice and high can not to be carried in the mould field big, in addition, when increasing mode field diameter, bending loss sharply increases, and causes luminous power to be leaked even the optical fiber damage, can't operate as normal.
U.S. Pat 20050105867 and Chinese patent CN200480033979.7 have set forth a kind of active photonic band-gap optical fiber, this fiber core is an air, bigger with the splice loss, splice attenuation of other optical fiber, and this invention optical fiber utilizes surface modes to carry out the transmission of laser, the laser power loss is big, can not satisfy practical application request well.Chinese patent 200510025561.8 has been described active big core diameter single-mode double-clad photon crystal optical fibre, this optical fiber utilizes the inner air hole to realize endless unimodular property, thereby improve the beam quality of optical-fiber laser, it is bigger that but this optical fiber exists bending loss, nonlinear effect is obvious, can not effectively the multimode pump power be converted into problems such as single-mode laser power.
In order to solve the deficiency of above-mentioned gain fibre, this patent proposes a kind of all solid state biobelt crack gain fibre, the photon band gap of this optical fiber can improve the transformation efficiency of pump light widely, promote the limitation capability of laser simultaneously, reduce the nonlinear effect of optical fiber, greatly improve the beam quality of optical-fiber laser, thereby satisfy the application demand of high-capacity optical fiber laser.
Summary of the invention
The object of the invention is to provide a kind of solid-state band gap gain photon crystal fiber guide.
A kind of gain photon crystal fiber guide provided by the invention comprises sandwich layer, around covering, the coating of sandwich layer; Described sandwich layer includes two concentric layers, and first fibre core is layered as the real core zone that pure quartz glass forms, and second fibre core is layered as has rare earth ion doped quartz glass cylindrical layer; Described covering comprises two parts, and a part is formed the inner cladding of optical fiber by Ge-doped quartz glass cylindrical layer, and another part is the surrounding layer of the optical fiber that constitutes of the composite structure by airport and quartz glass; Described coating layer portion is formed by the acryl resin of ultra-violet curing.
Aforesaid photon crystal fiber guide, the Doped Rare Earth ion is any in ytterbium, thulium, neodymium, holmium, praseodymium, erbium, the lanthanum in the described rare earth ion doped quartz glass cylindrical layer.
Aforesaid photon crystal fiber guide, described inner cladding is formed by mixing the solid-state microstructure hexagonal lattice that germanite English cylinder forms, it forms the outer band gap of this fibre-optic waveguide, be used for the strictness of multimode pump light is limited in the second fibre core delamination area with rear-earth-doped ion, improve the utilization ratio of pump light; That mixes germanite English cylinder mixes germanium part refractive index contrast between 0.15%～1.1%, and the ratio of diameter of mixing the germanium section diameter and mixing germanite English cylinder is between 0.56～0.98, and promptly grating constant ratio is between 0.56～0.98.
Aforesaid photon crystal fiber guide, the second fibre core layering of this optical fiber is made up of the solid-state microstructure hexagonal lattice that rare-earth ion-doped quartz cylinder forms, the function that possesses the gain of light, it forms the interior band gap of this gain fibre, is used under the effect of multimode pump light the laser strictness that produces being limited in the first fibre core delamination area that pure quartz glass is formed; The refractive index contrast of mixing the rare earth part of rare-earth ion-doped quartz cylinder is between 0.61%～2.2%, and the ratio of the diameter of its doped portion diameter and rare-earth ion-doped quartz cylinder is between 0.08～0.52.
Aforesaid photon crystal fiber guide, the real core fibre core that the first fibre core layering of this optical fiber is made up of pure quartz glass, be used to provide the output channel of laser, improve laser power and laser damage threshold that optical fiber bears, reduce the nonlinear effect of high-capacity optical fiber laser.
Aforesaid photon crystal fiber guide, the first fibre core delamination area diameter and the second fibre core delamination area grating constant ratio are between 1.02～4.60.
Aforesaid photon crystal fiber guide, the surrounding layer zone is the composite structure of airport and quartz glass, it is the composite structure that high purity quartz kapillary and outer quartz socket tube form, the filling mark of airport is between 80%～99.6%, so that form bigger refractive index contrast, provide bigger inner cladding numerical aperture.
A kind of pulse optical fiber provided by the invention adopts aforesaid gain photon crystal fiber guide.
A kind of jointed fiber laser instrument provided by the invention adopts aforesaid gain photon crystal fiber guide.
The invention solves the technical barrier that existing high-capacity optical fiber laser exists with gain fibre: promptly solve the technical contradiction of big mode field diameter and single mode running, big mode field diameter and the technical contradiction of high bending loss and the technical barriers such as damage from laser under the high power laser light.Solid Double band gap gain photon crystal fiber guide, this optical fiber has the dual wavelength band gap properties, and band gap limits optical maser wavelength is kept unimodular property and is reduced bending loss in it, has both promoted laser beam quality, has reduced the loss of laser power again; Solid Double band gap gain photon crystal fiber guide, this optical fiber has the dual wavelength band gap properties, and its outer band gap restrictive pump pumping wavelength reduces the leakage loss of pump power, thereby has promoted the utilization ratio of pump light; The rare earth ion annular doping structure utilizes the band gap effect to realize that the pump light volitional check to the annular doping zone, greatly improves the pump absorption efficient and the light light conversion efficiency of gain fibre; The pure silicon fibre core technology that combines with interior band gap is limited in the high power laser light that produces in the pure silicon core, greatly improves the laser damage threshold of optical fiber; The air micropore that the gain biobelt crack peripheral super large of photon crystal fiber guide accounts for boring ratio greatly improves the inner cladding numerical aperture, improves the pumping coupling efficiency widely, and peripheral big airport possesses good in heat dissipation characteristics; Adopt biobelt crack photonic crystal gain optical waveguide to carry out the applied research of fiber laser, solve the welding problem of air pass gain photonic crystal fiber, can improve the reliability and stability of fiber laser device; A kind of gain photon crystal fiber guide provided by the invention and fiber laser have the important use meaning at civil areas such as Laser Processing, laser medicine and defence and military field, and favorable economic benefit and application prospect.
Description of drawings
Fig. 1 is a gain photon crystal fiber guide end face structure synoptic diagram of the present invention;
Fig. 2 is the gain band gap diagram of photonic crystal fiber of the present invention;
Fig. 3 is the absorption spectra curve of a kind of photonic crystal fiber that gains of the present invention;
Fig. 4 is the structural representation of a kind of pulse optical fiber that photonic crystal fiber constitutes that adopts the present invention to gain;
Fig. 5 is the structural representation of a kind of jointed fiber laser instrument that photonic crystal fiber constitutes that adopts the present invention to gain;
Fig. 6 is the output power curve of the jointed fiber laser instrument that photonic crystal fiber makes that adopts the present invention to gain.
Embodiment
At first the term in the field under the present invention is defined as follows:
Laser: the light amplification that stimulated radiation produces is a kind of high-quality light source, and it possesses good monochromaticity, coherence and directivity.
Population inversion: the state that the population of the population ratio low-lying level of the high level of atom (molecule or ion) is many is called population inversion.
Gain: i.e. power amplification multiple, represent with the common logarithm of power input ratio with output power that generally unit is decibel (dB).
Fiber laser: be meant with the laser instrument of doped rare earth element glass optical fiber as gain media.Usually said fiber laser adopts the laser instrument of optical fiber as laser medium exactly, by the different rare earth ion (Yb, Er, Nd, Tm etc.) that mixes in matrix material of optic fibre.Gain fibre very easily forms high power density in the optical fiber under the effect of pump light, cause the laser levels " population inversion " of working-laser material, export when suitable adding positive feedback loop (formation resonator cavity) just can form the laser that laser generation output obtains the corresponding wave band of institute.
Continuous wave laser: export laser in continual mode, the time of exporting laser continuously was more than or equal to 0.25 second laser instrument.
Pulsed laser: the laser instrument with pulsed mode work is exactly a pulsed laser, and its single laser pulse width was less than 0.25 second.
Refractive index profile (RIP): the refractive index of optical fiber or preform (comprising fibre-optical mandrel) and the relation curve between its radius;
Absolute refraction rate variance (δ n): the refractive index of various piece and pure quartz glass refractive index is poor in the preform;
Relative index of refraction (Δ %):
N wherein
iBe
iThe refractive index of layer fiber optic materials, n
oRefractive index for pure quartz glass.
Useful area:
Wherein E is and propagates relevant electric field, and r is a fiber radius;
PCVD: PCVD;
MCVD: improved chemical vapor deposition;
DND: directly nano particle deposits
PBG: photon band gap (photonic band gap).
Describe embodiments of the invention below with reference to the accompanying drawings in detail.
Fig. 1 is a kind of gain photon crystal fiber guide end face structure synoptic diagram, wherein 1 is the first fibre core layering that is made of the pure quartz glass core, 2 for mixing the second fibre core layering that rare earth quartz glass cylinder forms, 3 for mixing the inner cladding that germanite English glass cylinder forms, 4 surrounding layers for the formation of airport quartz glass, the filling mark of airport between 80%～99.6%, 5 fibre coatings that form for the ultraviolet curing acrylic resin.
Fig. 2 is the band gap diagram of this photonic crystal fiber, wherein 1
StPBG, 2
StPBG, 3
StPBG represents single order band gap, second order band gap and the three rank band gap of optical fiber respectively; Core-line represents the effective refractive index line of pure quartz glass fiber cores.
Fig. 3 is the absorption spectra curve of this photonic crystal fiber.
Fig. 4 is a kind of pulsed light photonic crystal fiber laser instrument synoptic diagram, and what connect successively among the figure is: 6 for seed signal light laser, 7 is the multimode pump laser diode, and 8 is (6+1) * 1 bundling device, and 9 is according to gain photonic crystal fiber of the present invention.
Fig. 5 is a kind of continuous light photonic crystal fiber laser instrument synoptic diagram, what connect successively among the figure is: 11 are the multimode pump laser diode, 12 is 7 * 1 power bundling devices, 13 is the fiber grating of optical maser wavelength high reflectance, 9 is according to gain photonic crystal fiber of the present invention, 14 is the fiber grating of optical maser wavelength high-transmission rate, and 10 are the output energy optical fiber.
Embodiment 1:
Adopt improved chemical vapor deposition (MCVD) technology to produce and mix ytterbium ion (also can mix rare earth ions such as thulium, neodymium, holmium, praseodymium, erbium, lanthanum) fibre-optical mandrel, rear-earth-doped concentration is more than 6000ppm.Mix rare earth quartz glass cylinder what under the high temperature about 2200 ℃, be drawn into 400 ± 10 μ m on the wire-drawer-tower then, this refractive index contrast of mixing the rare earth part is between 0.61%～2.2%, be 0.61% in this example, rare-earth ion-doped section diameter and the diameter ratio of mixing rare earth quartz glass cylinder are 0.18 between 0.08～0.52 in this example.Using plasma chemical vapor deposition (PCVD) technology is made high-purity quartz glass bar, and on wire-drawer-tower, wire drawing becomes the pure quartz glass cylinder of 800 ± 10 μ m under 2200 ℃ high temperature then.Adopt PCVD technology to prepare the fibre core refractive index contrast and between 0.15%～1.1%, mix germanite English glass bar, be in this example 0.20% mix germanite English glass bar, on wire-drawer-tower, be drawn into the glass cylinder of 400 ± 10 μ m then, the diameter ratio of mixing germanium section diameter and whole cylinder is 0.56 between 0.56～0.98 in this example.The purity quartz glass pipe for high that adopts PCVD to prepare at high temperature is drawn into the quartz capillary of 400 ± 10 μ m, and its diameter of bore is about 366 ± 10 μ m.With 1 pure quartz glass cylinder (i.e. the first fibre core layering 1) of drawing above, 84 are arranged in the hexagon shape this mix rare earth quartz glass cylinder (i.e. the second fibre core layering 2), 180 germanite English glass cylinder (being inner cladding 3) of mixing that are arranged in hexagonal shape are arranged in dot matrix as shown in Figure 1, this optical fiber cylindrical beam of arranging is put into the high purity quartz sleeve pipe that diameter is 28mm (being the part of inner cladding).Closely arranging a loop diameter then around it is 1000 μ m, after internal diameter is the high purity quartz kapillary of 900 μ m, the diameter of packing into together is in the quartz socket tube of 35mm (high purity quartz kapillary and quartz socket tube form surrounding layer 4), forms the Yb-doped photon crystal optical fiber prefabricated rods.Being drawn into cladding diameter at 2100 ℃ at last is 125 μ m, and the optical fiber of the outer 245 μ m of coating diameter promptly becomes Yb-doped photon crystal optical fiber shown in Figure 1.The first fibre core delamination area diameter and the second fibre core delamination area grating constant ratio are between 1.02～4.60, and this optical fiber inner cladding forms has the high-order band gap shown in Fig. 2 (as 2
StPBG and 3
StPBG), multimode pump light (as the 976nm wavelength light) strictness is limited in possesses in the second fibre core delamination area that ytterbium ion mixes, so that inspire laser about the 1064nm wavelength.This optical fiber second fibre core delamination area dot matrix forms has low order band gap (1 shown in Figure 2
StPBG), the laser (as 1064nm) that produces is imported in the first fibre core delamination area of being made up of pure quartz glass.This optical fiber has absorption spectra characteristic shown in Figure 3, is respectively 6.8dB/m and 7.6dB/m at the absorption coefficient of 915nm and 976nm.Pump diode, this gain photonic crystal fiber of the 976nm of the seed light laser diode of the 1064nm of average power 100mW, 6 5W are formed pulse optical fiber according to Fig. 4, can obtain the laser about the 1064nm about 10W.915nm pump diode, this gain photonic crystal fiber, the fiber grating of 7 5W are formed fiber laser according to Fig. 5, can obtain the laser output of the 1090nm wavelength about 25W as shown in Figure 6.
Embodiment 2:
Adopt improved chemical vapor deposition (MCVD) technology to produce and mix ytterbium ion (also can mix rare earth ions such as thulium, neodymium, holmium, praseodymium, erbium, lanthanum) fibre-optical mandrel, rear-earth-doped concentration is more than 8000ppm, mix rare earth quartz glass cylinder what under the high temperature about 2200 ℃, be drawn into 400 ± 10 μ m on the wire-drawer-tower then, this mixes rare earth part refractive index contrast between 0.61%～2.2%, be 0.61% in this example, the diameter ratio of rare-earth ion-doped section diameter and whole cylinder is between 0.08～0.52, is 0.32 in this example.Using plasma chemical vapor deposition (PCVD) technology is made high-purity quartz glass bar, and on wire-drawer-tower, wire drawing becomes the pure quartz glass cylinder of 800 ± 10 μ m under 2200 ℃ high temperature then.Adopt PCVD technology to prepare the fibre core refractive index contrast between 0.15%～1.1%, mixing germanite English glass bar, be in this example 0.46% mix germanite English glass bar, on wire-drawer-tower, be drawn into the glass cylinder of 400 ± 10 μ m then, the diameter ratio of mixing germanium section diameter and whole cylinder is 0.86 between 0.56～0.98 in this example.The purity quartz glass pipe for high that adopts PCVD to prepare at high temperature is drawn into the quartz capillary of 400 ± 10 μ m, and its diameter of bore is about 326 ± 10 μ m.With 1 this pure quartz glass cylinder (i.e. the first fibre core layering 1) of drawing above, 84 are arranged in the hexagon shape this mix rare earth quartz glass cylinder (i.e. the second fibre core layering 2), 180 germanite English glass cylinder (being inner cladding 3) of mixing that are arranged in hexagonal shape are arranged in dot matrix as shown in Figure 1, this optical fiber cylindrical beam of arranging is put into the high purity quartz sleeve pipe that diameter is 28mm (being the part of inner cladding 3).Closely arranging a loop diameter then around it is 1000 μ m, after internal diameter is the high purity quartz kapillary of 900 μ m, the diameter of packing into together is in the quartz socket tube of 35mm (high purity quartz kapillary and quartz socket tube form surrounding layer 4), forms the Yb-doped photon crystal optical fiber prefabricated rods.Being drawn into cladding diameter at 2100 ℃ at last is 125 μ m, and the optical fiber of the outer 245 μ m of coating diameter promptly becomes Yb-doped photon crystal optical fiber shown in Figure 1, and the first fibre core delamination area diameter and the second fibre core delamination area grating constant ratio are between 1.02～4.60.
Embodiment 3:
Adopt improved chemical vapor deposition (MCVD) technology to produce and mix ytterbium ion (also can mix rare earth ions such as thulium, neodymium, holmium, praseodymium, erbium, lanthanum) fibre-optical mandrel, rear-earth-doped concentration is more than 8000ppm, mix rare earth quartz glass cylinder what under the high temperature about 2200 ℃, be drawn into 400 ± 10 μ m on the wire-drawer-tower then, this mixes rare earth part refractive index contrast between 0.61%～2.2%, be 0.98% in this example, the diameter ratio of rare-earth ion-doped section diameter and whole cylinder is between 0.08～0.52, is 0.39 in this example.Using plasma chemical vapor deposition (PCVD) technology is made high-purity quartz glass bar, and on wire-drawer-tower, wire drawing becomes the pure quartz glass cylinder of 410 ± 10 μ m under 2200 ℃ high temperature then.Adopt PCVD technology to prepare the fibre core refractive index contrast between 0.15%～1.1%, mixing germanite English glass bar, be in this example 0.81% mix germanite English glass bar, on wire-drawer-tower, be drawn into the glass cylinder of 400 ± 10 μ m then, the diameter ratio of mixing germanium section diameter and whole cylinder is 0.56 between 0.56～0.98 in this example.The purity quartz glass pipe for high that adopts PCVD to prepare at high temperature is drawn into the quartz capillary of 400 ± 10 μ m, and its diameter of bore is about 352 ± 10 μ m.With 1 this pure quartz glass cylinder (i.e. the first fibre core layering 1) of drawing above, 90 are arranged in hexagonal shape this mix rare earth quartz glass cylinder (i.e. the second fibre core layering 2), 180 germanite English glass cylinder (being inner cladding 3) of mixing that are arranged in hexagonal shape are arranged in dot matrix as shown in Figure 1, this optical fiber cylindrical beam of arranging is put into the high purity quartz sleeve pipe that diameter is 28mm (being the part of inner cladding 3).Closely arranging a loop diameter then around it is 1000 μ m, after internal diameter is the high purity quartz kapillary of 900 μ m, the diameter of packing into together is in the quartz socket tube of 35mm (high purity quartz kapillary and quartz socket tube form surrounding layer 4), forms the Yb-doped photon crystal optical fiber prefabricated rods.Being drawn into cladding diameter at 2100 ℃ at last is 125 μ m, and the optical fiber of the outer 245 μ m of coating diameter promptly becomes Yb-doped photon crystal optical fiber shown in Figure 1, and the first fibre core delamination area diameter and the second fibre core delamination area grating constant ratio are between 1.02～4.60.
Embodiment 4:
Adopt improved chemical vapor deposition (MCVD) technology to produce and mix ytterbium ion (also can mix rare earth ions such as thulium, neodymium, holmium, praseodymium, erbium, lanthanum) fibre-optical mandrel, rear-earth-doped concentration is more than 6000ppm, mix rare earth quartz glass cylinder what under the high temperature about 2200 ℃, be drawn into 400 ± 10 μ m on the wire-drawer-tower then, this mixes rare earth part refractive index contrast between 0.61%～2.2%, be 0.98% in this example, the diameter ratio of rare-earth ion-doped section diameter and whole cylinder is between 0.08～0.52, is 0.18 in this example.Using plasma chemical vapor deposition (PCVD) technology is made high-purity quartz glass bar, and on wire-drawer-tower, wire drawing becomes the pure quartz glass cylinder of 2000 ± 20 μ m under 2200 ℃ high temperature then.Adopt PCVD technology to prepare the fibre core refractive index contrast between 0.15%～1.1%, mixing germanite English glass bar, be in this example 0.20% mix germanite English glass bar, on wire-drawer-tower, be drawn into the glass cylinder of 400 ± 10 μ m then, the diameter ratio of mixing germanium section diameter and whole cylinder is 0.56 between 0.56～0.98 in this example.The purity quartz glass pipe for high that adopts PCVD to prepare at high temperature is drawn into the quartz capillary of 400 ± 10 μ m, and its diameter of bore is about 366 ± 10 μ m.With 1 this pure quartz glass cylinder (i.e. the first fibre core layering 1) of drawing above, 72 are arranged in the hexagon shape this mix rare earth quartz glass cylinder (i.e. the second fibre core layering 2), 180 germanite English glass cylinder (being inner cladding 3) of mixing that are arranged in the hexagon shape are arranged in hexagonal lattice as shown in Figure 1, this optical fiber cylindrical beam of arranging is put into the high purity quartz sleeve pipe that diameter is 28mm (being the part of inner cladding 3).Closely arranging a loop diameter then around it is 1000 μ m, after internal diameter is the high purity quartz kapillary of 900 μ m, the diameter of packing into together is in the quartz socket tube of 35mm (high purity quartz kapillary and quartz socket tube form surrounding layer 4), forms the Yb-doped photon crystal optical fiber prefabricated rods.Being drawn into cladding diameter at 2100 ℃ at last is 125 μ m, and the optical fiber of the outer 245 μ m of coating diameter promptly becomes Yb-doped photon crystal optical fiber shown in Figure 1, and the first fibre core delamination area diameter and the second fibre core delamination area grating constant ratio are between 1.02～4.60.
Above-mentioned accompanying drawing and embodiment are only described for illustrative, protection scope of the present invention are not formed restriction, and protection domain of the present invention is limited by claims.
Claims (6)
1, a kind of gain photon crystal fiber guide is characterized in that:
Comprise sandwich layer, covering, the acryl resin coating of ultraviolet light polymerization around sandwich layer;
Described sandwich layer includes two concentric layers, and first fibre core is layered as the real core zone that pure quartz glass forms, and second fibre core is layered as has rare earth ion doped quartz glass cylindrical layer;
Described covering comprises two parts, and a part is formed the inner cladding of optical fiber by Ge-doped quartz glass cylindrical layer, and another part is the surrounding layer of the optical fiber that constitutes of the composite structure by airport and quartz glass;
Described coating layer portion is formed by the acryl resin of ultraviolet light polymerization;
Described inner cladding is formed by mixing the solid-state microstructure hexagonal lattice that germanite English glass cylinder forms, it forms the outer band gap of this fibre-optic waveguide, be used for the strictness of multimode pump light is limited in the second fibre core delamination area with rear-earth-doped ion, improve the utilization ratio of pump light;
The refractive index contrast of mixing the germanium part of mixing germanite English glass cylinder in the inner cladding is between 0.15%～1.1%, the ratio of diameter of mixing the diameter of germanium part and mixing germanite English glass cylinder is between 0.56～0.98, and promptly grating constant ratio is between 0.56～0.98;
The second fibre core layering of this optical fiber is made up of the solid-state microstructure hexagonal lattice that rare-earth ion-doped quartz cylinder forms, the function that possesses the gain of light, it forms the interior band gap of this gain fibre, is used under the effect of multimode pump light the laser strictness that produces being limited in the first fibre core delamination area that pure quartz glass is formed;
The refractive index contrast of mixing rare earth part of rare-earth ion-doped quartz cylinder is between 0.61%～2.2% in the second fibre core layering, and the ratio of diameter of mixing the diameter of rare earth part and rare-earth ion-doped quartz cylinder is between 0.08～0.52;
The first fibre core delamination area diameter and the second fibre core delamination area grating constant ratio are between 1.02～4.60.
2, photon crystal fiber guide according to claim 1 is characterized in that:
The Doped Rare Earth ion is any in ytterbium, thulium, neodymium, holmium, praseodymium, erbium, the lanthanum in the second fibre core layering.
3, photon crystal fiber guide according to claim 1 is characterized in that:
The real core fibre core that the first fibre core layering of this optical fiber is made up of pure quartz glass is used to provide the output channel of laser, improves laser power and laser damage threshold that optical fiber bears, reduces the nonlinear effect of high-capacity optical fiber laser.
4, photon crystal fiber guide according to claim 1 is characterized in that:
The surrounding layer zone is the composite structure of airport and quartz glass, it is the composite structure that high purity quartz kapillary and outer quartz socket tube form, the filling mark of airport so that form bigger refractive index contrast, provides bigger inner cladding numerical aperture between 80%～99.6%.
5, a kind of pulsed light photonic crystal fiber laser instrument is characterized in that:
Connect seed signal light laser, multimode pump laser diode successively, (6+1) * 1 bundling device, gain photonic crystal fiber as claimed in claim 1.
6, a kind of continuous light photonic crystal fiber laser instrument is characterized in that:
The fiber grating, the output energy optical fiber that connect the fiber grating of multimode pump laser diode, 7 * 1 power bundling devices, optical maser wavelength high reflectance, gain photonic crystal fiber as claimed in claim 1, optical maser wavelength high-transmission rate successively.
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Assignee: FiberHome Fujikura Optical Fiber Technology Co., Ltd. Assignor: Fenghuo Communication Science &. Technology Co., Ltd. Contract record no.: 2011420000043 Denomination of invention: Gain photon crystal fiber guide and its device Granted publication date: 20100203 License type: Exclusive License Open date: 20090218 Record date: 20110411 |