CN1543023A - Large mode area double-cladding fiber single-mode laser and manufacturing method - Google Patents
Large mode area double-cladding fiber single-mode laser and manufacturing method Download PDFInfo
- Publication number
- CN1543023A CN1543023A CNA031276903A CN03127690A CN1543023A CN 1543023 A CN1543023 A CN 1543023A CN A031276903 A CNA031276903 A CN A031276903A CN 03127690 A CN03127690 A CN 03127690A CN 1543023 A CN1543023 A CN 1543023A
- Authority
- CN
- China
- Prior art keywords
- fiber
- model area
- large model
- fibre core
- optical fiber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Lasers (AREA)
Abstract
This invention relates to a large mode area double clad fiber single mode laser and its preparation method, firstly selecting a section of large mode area double clad fiber to remove the cladding to form a unified fiber of cone fiber drawn from the bare fiber and a single mode fiber and removing cladding at its both sides to get a fiber grating to package it and finish the production of a laser which includes a double cladding fiber grating, a cladding, a large diameter inner cladding, a large mode area fiber core, a cone inner cladding, a cone fiber core, a single mode cladding, a single mode fiber core and a single mode fiber grating which avoids connection loss, eliminates pump light interference and increases output stability and absorbance.
Description
Technical field: the invention belongs to the fiber laser field, relate to improvement to the high-power double cladding optical fiber laser structure.
Background technology: high-power double cladding optical fiber laser uses doubly clad optical fiber as active medium, doubly clad optical fiber is by the fiber core with single-mold of doping with rare-earth ions, the inner cladding of the outside large-size of fibre core and the surrounding layer of low-refraction are formed, pumping source adopts semiconductor laser usually, its pumping principle be with high-power wide multiple die semiconductor laser or optical fiber output module usually some optical elements high-power laser beam is coupled in the inner cladding in the doubly clad optical fiber, and laser is to be exaggerated transmission at doubly clad optical fiber in fibre core to obtain nearly diffraction limited single-mode laser output, add the front cavity mirror of double color plate as laser between doubly clad optical fiber and pumping source, Effect of Back-Cavity Mirror adopts the natural cleavage plane of doubly clad optical fiber rear end to realize the light feedback.In doubly clad optical fiber, with laser beam different propagation paths is arranged owing to pump beam, the inner cladding diameter is more near the diameter of fiber core with single-mold, the overlapping area of pump beam and laser beam is big more, the effective absorption coefficient of doubly clad optical fiber is big more, and for having the same dopant ion and the fiber core with single-mold of concentration in the doubly clad optical fiber, reducing of inner cladding diameter, adopt Lens Coupling no matter be, still adopt fusion techniques, all strengthen pump light and be coupled into difficulty in the doubly clad optical fiber inner cladding, for the overlapping area that realizes that pump beam and laser beam are higher, pump beam need be compressed, pump light is entered in the inner cladding of doubly clad optical fiber, so that in communication process, absorbed by the single mode fibre core, coupling efficiency is low, perhaps adopt the more optical fiber output pumping source of high power density, but the manufacturing technology difficulty of the pumping source of high power density is big, the cost height, adopt fiber core with single-mold absorptive pumping light simultaneously, the absorption efficiency of fiber core with single-mold is smaller, for obtaining enough gains, just need to increase the use length of doubly clad optical fiber, adopt the pumping source of high power density and the use length that increases doubly clad optical fiber can increase cost exponentially; Need to add other optical element between pumping source and doubly clad optical fiber, focus on coupled lens group and front cavity mirror etc. as collimation, can increase the cavity loss of laser, complex structure and instability also can't realize the high-capacity optical fiber laser of full fiberize structure.
Detailed content of the present invention: low for solving in the background technology in the double-clad optical fiber laser coupling efficiency of optical fiber and pumping source, it is big to make high power density pump light difficulty, the cost height, the adding optical element can increase the cavity loss of laser again, complex structure and instability, can't realize problems such as full fiberize structure, the objective of the invention is to design and prepared a kind of novel high-power large model area doubly clad optical fiber single mode output laser, improved the coupling efficiency of doubly clad optical fiber and pump light, need not to add optical element, compact conformation is simple, has realized full fiberize structure, and cost reduces.
For achieving the above object, preparation method's step of large model area doubly clad optical fiber single-mode laser of the present invention is: at first choose one section large model area doubly clad optical fiber of being made up of large model area fibre core, major diameter inner cladding and surrounding layer; The surrounding layer of removing certain-length at an end of large model area doubly clad optical fiber forms the bare fiber that contains fibre core and inner cladding; Bare fiber is placed in the fibre-optical drawing stove, under molten condition, bare fiber is drawn out conical fiber, and make a section single-mould fiber at the front end of conical fiber, the length of conical fiber guarantees to filter all the higher order mode (LP by the large model area fibre core generation of doubly clad optical fiber
Mn, m>0 or n>1), promptly only allow lowest-order (LP
01) mode signal light enters monomode fiber again by conical fiber, guarantees that again flashlight at conical fiber leakage loss does not take place simultaneously; Draw conical fiber and monomode fiber, promptly made the optical fiber that is combined into one by large model area doubly clad optical fiber, conical fiber and monomode fiber; Remove surrounding layer at large model area doubly clad optical fiber near the appropriate location of the other end and form the bare fiber that contains fibre core and inner cladding; On large model area fibre core, produce fiber grating and encapsulation; Produce another fiber grating at monomode fiber near the appropriate location of output; The other end of large model area doubly clad optical fiber is connected with the output optical fibre of pumping source, has then finished the making of the large model area doubly clad optical fiber single-mode laser of full fiberize structure.
Be connected with an end of another monomode fiber at the monomode fiber output, also can produce fiber grating in the appropriate location of another monomode fiber;
Structure of the present invention comprises: large model area doubly clad optical fiber: be made up of surrounding layer, major diameter inner cladding, large model area fibre core; The taper doubly clad optical fiber is made up of surrounding layer, taper inner cladding, taper fibre core; Monomode fiber is made up of single mode covering, fiber core with single-mold, doubly clad optical fiber grating, monomode fiber grating, the central shaft of surrounding layer, major diameter inner cladding, large model area fibre core, taper inner cladding, taper fibre core, single mode covering, fiber core with single-mold is located along the same line; Large model area fibre core right side is connected with taper fibre core left side, and the right side of taper fibre core is connected with the left side of fiber core with single-mold, and the right side of major diameter inner cladding is connected with the left side of taper inner cladding, and the right side of taper inner cladding is connected with the left side of single mode covering; Be mounted with successively outward by the lining from the center lateral cross section direction of large model area fibre core: large model area fibre core, major diameter inner cladding, surrounding layer; Be mounted with successively outward by the lining from the center lateral cross section direction of taper fibre core: taper fibre core, taper inner cladding, surrounding layer; Be mounted with successively outward by the lining from the center lateral cross section direction of fiber core with single-mold: fiber core with single-mold, single mode covering, surrounding layer; The doubly clad optical fiber grating is positioned on the position of close large model area fibre core left side input; The monomode fiber grating is positioned on the position of close fiber core with single-mold right side output.
Operation principle of the present invention is: pump light λ
pEnter the major diameter inner cladding of large model area doubly clad optical fiber, by the doubly clad optical fiber grating on the large model area fibre core, absorb through large model area fibre core quilt rare earth ion wherein repeatedly and produce flashlight, flashlight has a large amount of patterns, flashlight is transferred to forward in the taper fibre core of taper doubly clad optical fiber, the single mode signal light that the taper fibre core only allows to be present in the lowest-order pattern passes through, arrive the fiber core with single-mold of monomode fiber and continue transmission, by the part single mode signal light of returning of the monomode fiber optical grating reflection on the single mode fibre core, part single mode signal light is again oppositely in taper fibre core and the transmission of large model area fibre core, the doubly clad optical fiber grating that arrives on the large model area fibre core is reflected fully, repeat this process repeatedly and both formed single mode signal light light feedback, also have only single mode signal light to obtain gain and amplify, thereby obtain single-mode laser λ at the output of fiber core with single-mold
s
Advantage of the present invention: because the present invention made the fiber laser that is combined into one by large model area doubly clad optical fiber, conical fiber and monomode fiber, technology is simple, avoided because of connecting the loss that causes between non-integral optical fiber; Because the afterbody at large model area doubly clad optical fiber has used conical fiber, has limited pump light and has passed through, eliminated the interference of pump light to output laser, improve the laser output stability.Owing to used the major diameter inner cladding, improved the coupling efficiency of doubly clad optical fiber and pump light, can use the pumping source of low power density, reduce technical difficulty and cost, avoided using the collimation condenser lens to carry out the pump light coupling, supplementary load loss have been avoided, use fiber grating to replace the resonator mirror of dichroic mirror simultaneously as laser, therefore need not to add other separate optical element, compact conformation is simple, utilize the large model area fibre core in the large model area doubly clad optical fiber, increased the cross-sectional area of original fibre core, make large model area fibre core that bigger absorption efficiency be arranged, reduce the use length of doubly clad optical fiber, further reduced cost, utilized the taper doubly clad optical fiber to realize mode filtering simultaneously, have only the monotype laser of lowest-order to obtain sharp the penetrating of gain amplification realization, guarantee the single mode output of fiber laser.The doubly clad optical fiber of major diameter inner cladding can directly be connected with the output optical fibre of pumping source, has realized full fiberize structure, and the monomode fiber output can connect other monomode fiber transmission laser, and optical fiber can prolong arbitrarily, brings convenience to use.
Description of drawings:
Fig. 1 is the laser cutaway view of the embodiment of the invention 1
Fig. 2 a and Fig. 2 b are fiber grating encapsulation cutaway views of the present invention
Fig. 3 is the structure cutaway view of the embodiment of the invention 2
Embodiment:
Describe the present invention in detail below in conjunction with the drawings and specific embodiments, Fig. 1,2,3 is high power large model area doubly clad optical fiber single-mode laser cutaway view.The inventive system comprises: large model area doubly clad optical fiber: form by surrounding layer 2, major diameter inner cladding 3, large model area fibre core 4; The taper doubly clad optical fiber is made up of surrounding layer 2, taper inner cladding 5, taper fibre core 6; Monomode fiber is made up of single mode covering 7, fiber core with single-mold 8, doubly clad optical fiber grating 1, monomode fiber grating 9, pumping source output optical fibre 10, monomode fiber 11, encapsulation sleeve pipe 12, refractive index match coating 13, fiber grating 14.
The preparation method of this device is as follows:
1) chooses one section large model area doubly clad optical fiber, wherein the diameter of large model area fibre core 4 is 45 μ m, large model area fibre core 4 is chosen quartz glass as matrix, be doped with rare earth ion simultaneously, as: neodymium ion or ytterbium ion, doping content is 0.5wt%, or multiple other rare earth ion of codope, the diameter of major diameter inner cladding 3 is 800 μ m, the material of major diameter inner cladding 3 is a quartz glass, mix germanium ion in the large model area fibre core 4, realize that the refringence between large model area fibre core 4 and the major diameter inner cladding 3 is 0.005, promptly numerical aperture is 0.1, the thickness of surrounding layer 2 is 100 μ m, it is 0.45 that major diameter inner cladding 3 forms numerical aperture with surrounding layer 2, and the material of surrounding layer 2 is selected the polymeric material of low-refraction (as n=1.377), the length L of large model area doubly clad optical fiber
LMAFDetermine by following formula: L
LMAF=1/ α
Eff, α
Eff(cm
-1) be the effective absorption coefficient of large model area doubly clad optical fiber, by formula α
Eff=α
cΓ decision, wherein α
c(cm
-1) be the absorption coefficient of large model area fibre core 4, by the dopant ion concentration decision of fibre core, the α in the present embodiment
c=1.1cm
-1Γ=S wherein
c/ S
i, S
c, S
iBe respectively the cross-sectional area of large model area fibre core 4 and major diameter inner cladding 3, then L
LMAF=17.5m, our length of choosing large model area doubly clad optical fiber is 20m here.
2) surrounding layer 2 with two meters long optical fibers of large model area doubly clad optical fiber one end soaks in the acid solution of dilution until all being removed, be put into then in the fibre-optical drawing tower, under high temperature (2200 ℃), major diameter inner cladding 3 and large model area fibre core 4 are in molten condition, the diameter of stretching major diameter inner cladding 3 is from 800m to 125m, and drawing out length is L
TaperThe taper doubly clad optical fiber, keeping the constant length that draws out again of diameter 125m of major diameter inner cladding 3 is L
SMFMonomode fiber, on taper doubly clad optical fiber that drawing is finished and monomode fiber, apply the low refractive index polymer material identical again with surrounding layer 2, thickness is 100m.
As shown in Figure 1, for the length L of taper doubly clad optical fiber
TaperThe angle theta that is become with taper fibre core 6 central shafts by the hypotenuse of taper fibre core 6
TaperDecision, angle theta
TaperBe subjected to guaranteeing that the taper doubly clad optical fiber only allows the restriction of single mode transport condition and no coupling loss condition, require angle theta
TaperClosely may be little, just can avoid lowest-order pattern LP
01With inferior low step mode LP
02Coupling loss, can be by formula:
Derive β in the formula
011And β
02Be lowest price pattern LP
01With inferior low step mode LP
02Propagation constant, a is the radius of taper fibre core 6, then taper doubly clad optical fiber length L
Taper>L
Taper, min=a
1-a
2/ tan (θ
Taper, max), a in the formula
1And a
2Therefore be respectively the radius of large model area fibre core 4 and fiber core with single-mold 8, when the length of taper doubly clad optical fiber during greater than 5cm, the Mode Coupling loss reduces to negligible degree, the length L of the taper doubly clad optical fiber of our making
TaperBe 3m, satisfy condition fully, the diameter of single mode covering 7 is 125 μ m, the diameter of fiber core with single-mold 8 is 7 μ m, the length of the monomode fiber that forms is 2 meters, this moment, the length of overall optical fibre laser was made up of the long large model area doubly clad optical fiber of 18m, the taper doubly clad optical fiber of 3m length and the monomode fiber of 2m, and the border of taper doubly clad optical fiber is an oblique line, and the taper doubly clad optical fiber also can be with parabolical change of shape.
3) with large model area doubly clad optical fiber apart from input end face 0.5m place, peel the long surrounding layer 2 of 10cm off, after under high pressure mixing the hydrogen enhanced sensitivity, under ultraviolet light (wavelength is 248nm) irradiation, on large model area fibre core 4, produce doubly clad optical fiber grating 1 with mask method, 1 couple of pump light λ of doubly clad optical fiber grating
pHigh permeability (greater than 85%) is to laser λ
sBe all-trans (greater than 99%), apply refractive index match coating 13, encapsulate (a) as Fig. 2 with encapsulation sleeve pipe 12.
4) with monomode fiber apart from output end face 0.5m place, peel the long surrounding layer 2 of 10cm off, under ultraviolet light (248nm) irradiation, on fiber core with single-mold 8, produce monomode fiber grating 9 with mask method, 9 couples of laser λ of monomode fiber grating after under high pressure mixing the hydrogen enhanced sensitivity
sReflectivity is 3-4%, applies refractive index match coating 13 and encapsulates (as Fig. 2 b) with encapsulation sleeve pipe 12,
When 5) using high power large model area doubly clad optical fiber single-mode laser, as shown in Figure 3, the pumping source output optical fibre 10 of same diameter is connected pump light λ with large model area doubly clad optical fiber
pBe coupled into 3 li of major diameter inner claddings, thereby realize full fiberize structure, the output connection monomode fiber 11 at monomode fiber is used for laser transmission.
The inventor provides second embodiment of the present invention, in Fig. 3, with the monomode fiber grating 9 on the 14 replacement fiber core with single-mold 8 of the fiber grating on monomode fiber 11 fibre cores, it is identical with the method for the 4th step making monomode fiber grating 9 to make fiber grating 14, and the connecting relation of other assembly is identical with first embodiment.
Selected parameter can require to select according to actual design in the foregoing description.
Claims (3)
1, the preparation method of large model area doubly clad optical fiber single-mode laser, it is characterized in that: preparation process is as follows: at first choose one section large model area doubly clad optical fiber of being made up of large model area fibre core, major diameter inner cladding and surrounding layer; The surrounding layer of removing certain-length at an end of large model area doubly clad optical fiber forms the bare fiber that contains fibre core and inner cladding; Bare fiber is placed in the fibre-optical drawing stove, under molten condition, bare fiber is drawn out conical fiber, and make a section single-mould fiber at the front end of conical fiber, the length of conical fiber guarantees to filter all the higher order mode (LP by the large model area fibre core generation of doubly clad optical fiber
Mn, m>0 or n>1), promptly only allow lowest-order (LP
01) mode signal light enters monomode fiber again by conical fiber, guarantees that again flashlight at conical fiber leakage loss does not take place simultaneously; Draw conical fiber and monomode fiber, promptly made the optical fiber that is combined into one by large model area doubly clad optical fiber, conical fiber and monomode fiber; Remove surrounding layer at large model area doubly clad optical fiber near the appropriate location of the other end and form the bare fiber that contains fibre core and inner cladding; On large model area fibre core, produce fiber grating and encapsulation; Produce another fiber grating at monomode fiber near the appropriate location of output; The other end of large model area doubly clad optical fiber is connected with the output optical fibre of pumping source, has then finished the making of the large model area doubly clad optical fiber single-mode laser of full fiberize structure.
2, according to claim 1 large model area doubly clad optical fiber single-mode laser, it is characterized in that: be connected with an end of another monomode fiber at the monomode fiber output, also can produce fiber grating in the appropriate location of another monomode fiber.
3, large model area doubly clad optical fiber single-mode laser, it comprises: surrounding layer (2), major diameter inner cladding (3), large model area fibre core (4), single mode covering (7), fiber core with single-mold (8), monomode fiber grating (9), it is characterized in that: also comprise doubly clad optical fiber grating (1), taper inner cladding (5), taper fibre core (6), the central shaft of surrounding layer (2), major diameter inner cladding (3), large model area fibre core (4), taper inner cladding (5), taper fibre core (6), single mode covering (7), fiber core with single-mold (8) is located along the same line; Large model area fibre core (4) right side is connected with taper fibre core (6) left side, the right side of taper fibre core (6) is connected with the left side of fiber core with single-mold (8), the right side of major diameter inner cladding (3) is connected with the left side of taper inner cladding (5), and the right side of taper inner cladding (5) is connected with the left side of single mode covering (7); Be mounted with successively outward by the lining from the center lateral cross section direction of large model area fibre core (4): large model area fibre core (4), major diameter inner cladding (3), surrounding layer (2); Be mounted with successively outward by the lining from the center lateral cross section direction of taper fibre core (6): taper fibre core (6), taper inner cladding (5), surrounding layer (2); Be mounted with successively outward by the lining from the center lateral cross section direction of fiber core with single-mold (8): fiber core with single-mold (8), single mode covering (7), surrounding layer (2); Doubly clad optical fiber grating (1) is positioned on the position of close large model area fibre core (4) left side input; Monomode fiber grating (9) is positioned on the position of close fiber core with single-mold (8) right side output.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 03127690 CN1251366C (en) | 2003-08-14 | 2003-08-14 | Large mode area double-cladding fiber single-mode laser and manufacturing method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN 03127690 CN1251366C (en) | 2003-08-14 | 2003-08-14 | Large mode area double-cladding fiber single-mode laser and manufacturing method |
Publications (2)
Publication Number | Publication Date |
---|---|
CN1543023A true CN1543023A (en) | 2004-11-03 |
CN1251366C CN1251366C (en) | 2006-04-12 |
Family
ID=34322075
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CN 03127690 Expired - Fee Related CN1251366C (en) | 2003-08-14 | 2003-08-14 | Large mode area double-cladding fiber single-mode laser and manufacturing method |
Country Status (1)
Country | Link |
---|---|
CN (1) | CN1251366C (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100428585C (en) * | 2006-05-08 | 2008-10-22 | 中国科学院上海光学精密机械研究所 | Dual-wavelength pulse fiber laser system |
WO2010009605A1 (en) * | 2008-07-25 | 2010-01-28 | Li Geng | Radiation transmitter |
CN102508336A (en) * | 2011-11-15 | 2012-06-20 | 中国科学院西安光学精密机械研究所 | Pump optical fiber combiner and preparation method thereof |
CN101884146B (en) * | 2007-10-03 | 2012-06-27 | 坦佩雷科技大学光电子研究中心 | Active optical fiber and method for fabricating an active optical fiber |
CN107290822A (en) * | 2016-04-01 | 2017-10-24 | 中国兵器装备研究院 | The manufacture method of cladding light stripper |
CN110690639A (en) * | 2018-07-05 | 2020-01-14 | 北京交通大学 | High efficiency injection locked fiber taper laser |
CN111740313A (en) * | 2020-07-09 | 2020-10-02 | 江苏师范大学 | Mid-infrared all-fiber laser oscillator based on tapered double-clad Raman gain fiber and method for generating mid-infrared laser |
-
2003
- 2003-08-14 CN CN 03127690 patent/CN1251366C/en not_active Expired - Fee Related
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN100428585C (en) * | 2006-05-08 | 2008-10-22 | 中国科学院上海光学精密机械研究所 | Dual-wavelength pulse fiber laser system |
CN101884146B (en) * | 2007-10-03 | 2012-06-27 | 坦佩雷科技大学光电子研究中心 | Active optical fiber and method for fabricating an active optical fiber |
WO2010009605A1 (en) * | 2008-07-25 | 2010-01-28 | Li Geng | Radiation transmitter |
CN102508336A (en) * | 2011-11-15 | 2012-06-20 | 中国科学院西安光学精密机械研究所 | Pump optical fiber combiner and preparation method thereof |
CN107290822A (en) * | 2016-04-01 | 2017-10-24 | 中国兵器装备研究院 | The manufacture method of cladding light stripper |
CN110690639A (en) * | 2018-07-05 | 2020-01-14 | 北京交通大学 | High efficiency injection locked fiber taper laser |
CN110690639B (en) * | 2018-07-05 | 2020-12-01 | 北京交通大学 | High efficiency injection locked fiber taper laser |
CN111740313A (en) * | 2020-07-09 | 2020-10-02 | 江苏师范大学 | Mid-infrared all-fiber laser oscillator based on tapered double-clad Raman gain fiber and method for generating mid-infrared laser |
Also Published As
Publication number | Publication date |
---|---|
CN1251366C (en) | 2006-04-12 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN100427979C (en) | Laser power integrated device and its implement method | |
CN101884146B (en) | Active optical fiber and method for fabricating an active optical fiber | |
CN100373193C (en) | S shaped erbium ytterbium codoped phosphate high gain optical waveguide, waveguide laser and optical waveguide amplifier | |
CN102967981A (en) | Super-continuous spectrum light source based on multicore photonic crystal fiber | |
CN103412369A (en) | Optical fiber beam combiner and preparation method thereof | |
CN102436065B (en) | Method and device for simultaneously generating and amplifying hollow beams through liquid core optical fiber | |
CN100587528C (en) | Gain photon crystal fiber waveguide and its device | |
CN202995205U (en) | Multicore photonic crystal fiber based supercontinuum source | |
CN101122653A (en) | Strongly coupled multi-core optical fiber | |
AU2020101195A4 (en) | An ultra-wideband high gain multi-core fiber light source | |
CN1251366C (en) | Large mode area double-cladding fiber single-mode laser and manufacturing method | |
CN100555010C (en) | The multi-core fiber and the preparation method that comprise the single core of photosensitivity | |
CN205427234U (en) | Mould field adapter and fiber laser | |
CN212230771U (en) | High-power optical fiber laser | |
CN2645299Y (en) | Large mode area double cladding optical fiber single-mode laser | |
CN213717242U (en) | Novel fiber laser | |
CN101620295A (en) | Large mode area multi-core fiber | |
CN203480073U (en) | Fiber combiner | |
CN213636601U (en) | All-fiber 980nm waveband high-power optical fiber oscillator | |
CN112290364B (en) | 980 Nm-band high-power optical fiber oscillator with all-fiber structure | |
CN111999806B (en) | Method and functional device for coupling single mode and multimode optical fiber modes | |
CN101237110B (en) | High power fiber laser of active lock phase multi-core interference coat pump and its making method | |
CN201107425Y (en) | Strongly coupled multi-core optical fiber | |
CN201083847Y (en) | Refractive index reverse guiding multi-core optical fiber | |
CN2685900Y (en) | Non-Circular double-clad laser optical fiber with pumping optical wave guide external cladding |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
C06 | Publication | ||
PB01 | Publication | ||
C10 | Entry into substantive examination | ||
SE01 | Entry into force of request for substantive examination | ||
C14 | Grant of patent or utility model | ||
GR01 | Patent grant | ||
C19 | Lapse of patent right due to non-payment of the annual fee | ||
CF01 | Termination of patent right due to non-payment of annual fee |