CN102183813B - Optical fiber structure with spotlighting layer - Google Patents
Optical fiber structure with spotlighting layer Download PDFInfo
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- CN102183813B CN102183813B CN2011101185800A CN201110118580A CN102183813B CN 102183813 B CN102183813 B CN 102183813B CN 2011101185800 A CN2011101185800 A CN 2011101185800A CN 201110118580 A CN201110118580 A CN 201110118580A CN 102183813 B CN102183813 B CN 102183813B
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- optical fiber
- refractive index
- light collecting
- collecting layer
- covering
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Abstract
The invention discloses an optical fiber structure with a spotlighting layer and relates to the fields of optical fiber amplifiers and optical fiber lasers. The optical fiber structure comprises a fiber core (1), a cladding (2) and the spotlighting layer (3), wherein the section of the spotlighting layer (3) is that side length of an inscribed regular N-gon of an excircle of the cladding of the optical fiber or a regular N-gon concentric to the optical fiber inside the cladding (2) is an ellipse of a long axis or half of the ellipse, and N is an integer from 4 to 8; the refractive index of the fiber core (1) ranges from 1.4 to 1.8; the refractive index of the cladding (2) ranges from 1.3 to 1.7; the refractive index of the spotlighting layer (3) ranges from 1.5 to 1.9; the fiber core (1) has a diameter of 5 to 8mu m; and the fiber core (1) has an outer radius of 62.5 to 100mu m. The problems of mechanical damage brought by machining and light damage brought by high optical power density in a point access method for optical fiber side pump in a high-power optical fiber laser and a high-power optical fiber amplifier are solved.
Description
Technical field
The present invention relates to have the optical fiber structure of light collecting layer.Be applied to the fiber laser and the amplifier region of profile pump especially.
Background technology
No matter fiber laser still is the modes of the most employing of fiber amplifier end pumping at present, and this depends primarily on the structural factor of optical fiber.At first, the constraint of the light signal of optical fiber is very capable, and the coupling efficiency of profile pump is difficult to effective raising; Secondly, because the maturation of optical fiber fusion welding technology is used, make end pumping can promote the coupling efficiency of laser greatly.But some field that is applied in of end pumping mode also is restricted; For example; Powerful pump light very likely causes irreversible damage to end face when end face is imported; And mostly current fiber laser profile pump technology is an access type also, can face the problem of optical fiber damage equally at access point.
The optical fiber side-pumping that adopts at present is technological as follows:
Multimode optical fiber pyrometric cone profile pump coupling scheme.Multimode optical fiber fused biconical taper directional couple is that many bare fibres and the doubly clad optical fiber that removes surrounding layer are intertwined; Heating makes it fusing in thermal-flame; While is stretching optical fiber at the optical fiber two ends; Make the fiber fuse district become the tapering transition section, can pump light be imported inner cladding by multimode optical fiber through the doubly clad optical fiber side, thereby realize coupling pump Pu, directed side.
The laser instrument that this method realizes, because the manufacturing process of fused biconical taper makes the coupling place optical fiber structure at pumping optical fiber and multimode Active Optical Fiber that variation take place, this raising for laser power and quality is unfavorable.
The coupling of V groove profile pump.This technology is removed the doubly clad optical fiber surrounding layer a bit of earlier, etches a V groove at exposed inner cladding then, and an inclined-plane of groove also can all be used for reflection with two faces as reflecting surface.Pump light is coupled through lenticule by semiconductor laser, and pump light is converged in the side of V groove, gets into the doubly clad optical fiber inner cladding through changing direction after the offside reflection, thereby along the axial transmission of optical fiber.In order to improve coupling efficiency, this method requires the V-type reflection groove to the pump light total reflection.
The fiber laser that this pump mode makes, the V-type groove makes the physical strength of optical fiber descend greatly to the wound of optical fiber, and also since too high to the manufacturing process requirement of V-type groove, all be unfavorable for popularizing and using of superpower laser.
Embed mirrored pumping coupling.Similar with V-type groove method, embed mirrored pumping coupling and also need slot at optical fiber side, this is improving one's methods of V-type groove in fact.
The fiber laser that this method realizes is the same with V groove side coupling pump technology; Embedding mirrored pumping coupling technique also has than lossy for the transmission of inner cladding inside-pumping light; Be unfavorable for the expansion that the multiple spot coupling injects pump power equally, and physical strength descends equally greatly.
The coupling of angle grinding and polishing profile pump.Its ultimate principle is to go a bit ofly at doubly clad optical fiber, peels off overlay and surrounding layer, and inner cladding is longitudinally carried out grinding and polishing, obtains the plane of segment in order to the coupling pump light.Then with end face by the fibre core of the good pumping optical fiber of certain angle grinding and polishing relatively this plane closely paste with and fix two fine relative positions.Pump light can be coupled into the inner cladding of doubly clad optical fiber by the pumping optical fiber side.
What fiber laser that this method realizes and fiber angle grinding and polishing side coupling pump technology were similar is that microprism carries out the side coupling, but the microprism width can not bring technical difficulty therefore for the processing of microprism greater than the diameter of inner cladding.
Summary of the invention
Technical matters to be solved by this invention is:
The profile pump technology of fiber laser and amplifier is too complicated and optical fiber had mechanical damage to technological requirement, makes the physical strength of optical fiber reduce greatly; The optical power density at Coupling point place is too high, very easily causes the optical fiber damage.
Technical scheme of the present invention:
The optical fiber structure that has light collecting layer, this optical fiber structure comprises fibre core, covering and light collecting layer.
The cross section of described light collecting layer is to be the oval or oval half the of major axis to connect in n-shaped or the covering the length of side with the concentric n-shaped of optical fiber in the covering cylindrical of optical fiber; N is 4～8 integer.
The refractive index of described fibre core is 1.4～1.8, and the refractive index of covering is 1.3～1.7, and the refractive index of light collecting layer is 1.5～1.9.
The diameter of described fibre core is 5 μ m～8 μ m, and the optical fiber external radius is 62.5 μ m～100 μ m.
Described light collecting layer is located in the half the cross section of covering, the outside plating total reflective mirror of second half of covering.
Said matrix material of optic fibre is plastics, pure silicon or quartz.
The present invention compares the beneficial effect that is had with prior art:
The profile pump technical operation of at present existing fiber laser and amplifier is too complicated; And optical fiber there is mechanical damage; The optical fiber structure that employing has light collecting layer need not the optical fiber that draws is done any extra machining, when simplifying technology, also makes the physical strength of optical fiber unaffected.The projecting cladding index of the refractive index of light collecting layer wherein; Form the structure of convex lens; Can the light that optical fiber side receives be focused on fibre core, make luminous energy more concentrated, help increasing the coupling efficiency and the output power of fiber laser or amplifier.
Description of drawings
Fig. 1 is the oval optical fiber structure that has light collecting layer for the cross section of the light collecting layer of N=4.
Fig. 2 is the semielliptical optical fiber structure that has light collecting layer for the cross section of the light collecting layer of N=4.
Fig. 3 is the semielliptical optical fiber structure that has light collecting layer for the cross section of the light collecting layer of N=6.
Fig. 4 is the oval optical fiber structure that has light collecting layer for the cross section of the light collecting layer of N=8 in covering inside.
Fig. 5 is located at second half the optical fiber structure that has light collecting layer of outside plating total reflective mirror of the half the cross section inner cladding of covering for light collecting layer.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
Embodiment one
The optical fiber structure that has light collecting layer, like Fig. 1, this optical fiber structure comprises fibre core 1, covering 2 and light collecting layer 3.
The cross section of described light collecting layer 3 is to be the ellipse of major axis with the length of side that connects square in the covering cylindrical of optical fiber.
The refractive index of described fibre core 1 is 1.4, and the refractive index of covering 2 is 1.3, and the refractive index of light collecting layer 3 is 1.5.
The diameter of described fibre core 1 is 5 μ m, and the optical fiber external radius is 62.5 μ m.
Said matrix material of optic fibre is quartzy.
Embodiment two
The optical fiber structure that has light collecting layer, like Fig. 2, this optical fiber structure comprises fibre core 1, covering 2 and light collecting layer 3.
The cross section of described light collecting layer 3 is to be ellipse half the of major axis with the length of side that connects square in the covering cylindrical of optical fiber.
The refractive index of described fibre core 1 is 1.8, and the refractive index of covering 2 is 1.7, and the refractive index of light collecting layer 3 is 1.9.
The diameter of described fibre core 1 is 8 μ m, and the optical fiber external radius is 100 μ m.
Said matrix material of optic fibre is plastics.
Embodiment three
The optical fiber structure that has light collecting layer, like Fig. 3, this optical fiber structure comprises fibre core 1, covering 2 and light collecting layer 3.
The cross section of described light collecting layer 3 is to connect ellipse half that the orthohexagonal length of side is a major axis in the covering cylindrical of optical fiber.
The refractive index of described fibre core 1 is 1.6, and the refractive index of covering 2 is 1.5, and the refractive index of light collecting layer 3 is 1.7.
The diameter of described fibre core 1 is 7 μ m, and the optical fiber external radius is 80 μ m.
Said matrix material of optic fibre is a pure silicon.
Embodiment four
The optical fiber structure that has light collecting layer, like Fig. 4, this optical fiber structure comprises fibre core 1, covering 2 and light collecting layer 3.
The cross section of described light collecting layer 3 is in covering 2, to be the ellipse of major axis with the length of side of the concentric octagon of optical fiber.
The refractive index of described fibre core 1 is 1.6, and the refractive index of covering 2 is 1.5, and the refractive index of light collecting layer 3 is 1.7.
The diameter of described fibre core 1 is 5 μ m, and the optical fiber external radius is 90 μ m.
Said matrix material of optic fibre is quartzy.
Embodiment five
The optical fiber structure that has light collecting layer, this optical fiber structure comprise fibre core 1, covering 2 and light collecting layer 3.
The cross section of described light collecting layer 3 is connecing orthohexagonal three adjacent ellipses that the length of side is a major axis in the covering cylindrical of optical fiber, at second half outside plating total reflective mirror 4 of optical fiber.
The refractive index of described fibre core 1 is 1.7, and the refractive index of covering 2 is 1.6, and the refractive index of light collecting layer 3 is 1.8.
The diameter of described fibre core 1 is 6 μ m, and the optical fiber external radius is 70 μ m.
Described light collecting layer 3 is located in the half the cross section of covering 2, the outside plating of second half of covering 2 total reflective mirror 4.
Said matrix material of optic fibre is plastics.
Claims (4)
1. have the optical fiber structure of light collecting layer, it is characterized in that: this optical fiber structure comprises fibre core (1), covering (2) and light collecting layer (3);
The cross section of described light collecting layer (3) is to be the ellipse of major axis with the covering cylindrical of optical fiber and by the length of side that connects in the covering cylindrical of optical fiber in that n-shaped surrounds or the covering (2) with the concentric n-shaped of optical fiber; N is 4～8 integer;
The refractive index of described fibre core (1) is 1.6, and the refractive index of covering (2) is 1.5, and the refractive index of light collecting layer (3) is 1.7; Or
The refractive index of described fibre core (1) is 1.4, and the refractive index of covering (2) is 1.3, and the refractive index of light collecting layer (3) is 1.5; Or
The refractive index of described fibre core (1) is 1.8, and the refractive index of covering (2) is 1.7, and the refractive index of light collecting layer (3) is 1.9; Or
The refractive index of described fibre core (1) is 1.7, and the refractive index of covering (2) is 1.6, and the refractive index of light collecting layer (3) is 1.8.
2. the optical fiber structure that has light collecting layer according to claim 1 is characterized in that:
The diameter of described fibre core (1) is 5 μ m～8 μ m, and the optical fiber external radius is 62.5 μ m～100 μ m.
3. the optical fiber structure that has light collecting layer according to claim 1 is characterized in that:
Described light collecting layer (3) is located in the half the cross section of covering (2), the outside plating total reflective mirror (4) of second half of covering (2).
4. the optical fiber structure that has light collecting layer according to claim 1 is characterized in that:
The host material of said optical fiber is plastics, pure silicon or quartz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101185800A CN102183813B (en) | 2011-05-09 | 2011-05-09 | Optical fiber structure with spotlighting layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101185800A CN102183813B (en) | 2011-05-09 | 2011-05-09 | Optical fiber structure with spotlighting layer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102183813A CN102183813A (en) | 2011-09-14 |
| CN102183813B true CN102183813B (en) | 2012-05-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011101185800A Expired - Fee Related CN102183813B (en) | 2011-05-09 | 2011-05-09 | Optical fiber structure with spotlighting layer |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102331600B (en) * | 2011-10-17 | 2016-01-20 | 深圳朗光科技有限公司 | A kind of optical fiber and large-power optical fiber device |
| CN106841169B (en) * | 2017-04-20 | 2020-02-07 | 重庆师范大学 | Ultra-trace detection optode based on surface enhanced Raman effect |
| WO2020004238A1 (en) * | 2018-06-25 | 2020-01-02 | 株式会社フジクラ | Multi-clad optical fiber and method for manufacturing same |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5121460A (en) * | 1991-01-31 | 1992-06-09 | The Charles Stark Draper Lab., Inc. | High-power mode-selective optical fiber laser |
| US5412745A (en) * | 1994-05-05 | 1995-05-02 | Corning Incorporated | Fiber optic coupler exhibiting low nonadiabatic loss |
| US5715346A (en) * | 1995-12-15 | 1998-02-03 | Corning Incorporated | Large effective area single mode optical waveguide |
| CN1845402A (en) * | 2006-03-03 | 2006-10-11 | 清华大学 | Solid laser gain module using batten-shaped sectional doped gain medium |
| CN101042514A (en) * | 2006-12-29 | 2007-09-26 | 北京交通大学 | Double covered optical fiber side-pumping coupler grating and realization method thereof |
| CN201314957Y (en) * | 2008-11-13 | 2009-09-23 | 富通集团有限公司 | Improved non-zero dispersion shifted single-mode fiber with large mode field distribution |
-
2011
- 2011-05-09 CN CN2011101185800A patent/CN102183813B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5121460A (en) * | 1991-01-31 | 1992-06-09 | The Charles Stark Draper Lab., Inc. | High-power mode-selective optical fiber laser |
| US5412745A (en) * | 1994-05-05 | 1995-05-02 | Corning Incorporated | Fiber optic coupler exhibiting low nonadiabatic loss |
| US5715346A (en) * | 1995-12-15 | 1998-02-03 | Corning Incorporated | Large effective area single mode optical waveguide |
| CN1845402A (en) * | 2006-03-03 | 2006-10-11 | 清华大学 | Solid laser gain module using batten-shaped sectional doped gain medium |
| CN101042514A (en) * | 2006-12-29 | 2007-09-26 | 北京交通大学 | Double covered optical fiber side-pumping coupler grating and realization method thereof |
| CN201314957Y (en) * | 2008-11-13 | 2009-09-23 | 富通集团有限公司 | Improved non-zero dispersion shifted single-mode fiber with large mode field distribution |
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| CN102183813A (en) | 2011-09-14 |
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Granted publication date: 20120530 Termination date: 20130509 |