CN105652462A - Large-power optical fiber collimator system with cladding light filtering-out function - Google Patents

Large-power optical fiber collimator system with cladding light filtering-out function Download PDF

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Publication number
CN105652462A
CN105652462A CN201610042372.XA CN201610042372A CN105652462A CN 105652462 A CN105652462 A CN 105652462A CN 201610042372 A CN201610042372 A CN 201610042372A CN 105652462 A CN105652462 A CN 105652462A
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China
Prior art keywords
optical fiber
collimating lens
end cap
fixture
cladding light
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CN201610042372.XA
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Chinese (zh)
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CN105652462B (en
Inventor
许晓军
陈子伦
周旋风
王泽锋
侯静
陈胜平
张斌
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National University of Defense Technology
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National University of Defense Technology
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/30—Collimators
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/262—Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/20218—Modifications to facilitate cooling, ventilating, or heating using a liquid coolant without phase change in electronic enclosures

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Thermal Sciences (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Lasers (AREA)

Abstract

The invention discloses a large-power optical fiber collimator system with a cladding light filtering-out function. The large-power optical fiber collimator system comprises a double-cladding optical fiber output tail fiber, a glass optical fiber end cap and a clamp thereof, a collimating lens and a packaging device, and a water cooling circulation assembly. The glass optical fiber end cap and the clamp thereof include the glass optical fiber end cap and the end cap clamp. The collimating lens and the packaging device include the collimating lens and a collimating lens packaging clamp. A fiber core of the double-cladding optical fiber output tail fiber is connected with the glass optical fiber end cap through welding. The end cap clamp and the collimating lens packaging clamp in the collimating lens and the packaging device are connected through threads. The collimating lens is utilized to filter out cladding light. The water cooling circulation assembly is connected with the collimating lens packaging clamp so as to cool the collimating lens. According to the invention, the influences of the cladding light are eliminated, the power processing capability is improved, and the optical fiber laser output efficiency is improved.

Description

The large-power optical fiber collimator system of a kind of band cladding light filtering function
Technical field
The present invention is mainly concerned with optical fiber laser field, refers in particular to the large-power optical fiber collimator system of a kind of band cladding light filtering function.
Background technology
Optical fiber laser has the advantages such as efficiency of conversion height, good beam quality, compact construction, easy heat radiation, good operating stability, has been widely used in industry and national defence. Needs according to these application, people are also more and more higher for the pursuit of optical fiber laser output rating. In the last few years, along with the maturation of doubly clad optical fiber pump technology and the improvement of optic fibre manufacture process, the output rating of optical fiber laser also constantly promotes, and the output rating of single mode fiber laser has broken through 10KW, and the power level born for related device it is also proposed higher requirement.
Fiber optic collimator device is that optical fiber laser exports necessary basic optical element. Transmission laser conversion in optical fiber can be the collimation light (approximate parallel light) propagated in space by it, thus facilitates the space coupling of optical-fiber laser and long-distance transmissions etc. In a lot of optical passive component, such as optoisolator, wave filter etc., all need to use fiber optic collimator device.
For the output optical fibre collimator of high power fiber laser, except the requirement under general application conditions, also require that fiber optic collimator device can bear very high output rating. Meanwhile, the doubly clad optical fiber pump technology generally adopted due to present high power fiber laser and amplifier also exists the situation remaining cladding light in output optical fibre, it is necessary in use get rid of the impact of cladding light.
Summary of the invention
The technical problem to be solved in the present invention is just: the technical problem existed for prior art, and the present invention provides a kind of can eliminate cladding light impact, improve power handling capability, improve the large-power optical fiber collimator system of the band cladding light filtering function of optical-fiber laser output efficiency.
For solving the problems of the technologies described above, the present invention by the following technical solutions:
A large-power optical fiber collimator system for band cladding light filtering function, comprises doubly clad optical fiber and exports tail optical fiber, glass optical fiber end cap and fixture, collimating lens and encapsulation device and Water-cooling circulating assembly; Described glass optical fiber end cap and fixture thereof comprise glass optical fiber end cap and end cap fixture, and described collimating lens and encapsulation device comprise collimating lens and collimating lens encapsulation fixture; The tail optical fiber fibre core of described double-clad output fibre tail optical fiber is connected by welding with glass optical fiber end cap, collimating lens encapsulation fixture in described end cap fixture and collimating lens and encapsulation device is connected by screw thread, utilizes described collimating lens to realize the filtering to cladding light; Described Water-cooling circulating assembly and collimating lens encapsulate fixture and are connected and cool for collimation lens.
As a further improvement on the present invention: described doubly clad optical fiber exports tail optical fiber and the glass optical fiber end cap glue package with thermal conductivity is being held inside cap fixture.
As a further improvement on the present invention: the absorbing material that the internal surface of described collimating lens encapsulation fixture 31 applies one layer of high refractive index forms high refractive index layers of absorbent material.
As a further improvement on the present invention: described Water-cooling circulating assembly comprises water-in, inner cycle channel, outer circulation passage and water outlet, described water-cooled outer circulation passage encapsulates fixture with collimating lens and is connected, water coolant enters inner cycle channel from described water-in, collimation lens packages fixture carries out water-cooled process, then enter described outer circulation passage, finally discharge from described water outlet.
As a further improvement on the present invention: described water-cooled outer circulation passage is encapsulated fixture with collimating lens and is connected by screw thread and the glue with thermal conductivity.
Compared with prior art, it is an advantage of the current invention that:
1, the large-power optical fiber collimator system of the band cladding light filtering function of the present invention, exports tail optical fiber at doubly clad optical fiber and adds glass optical fiber end cap, it is to increase optical-fiber laser output efficiency and can bear power.
2, the large-power optical fiber collimator system of the band cladding light filtering function of the present invention, adds cladding light filtering function so that this kind of fiber optic collimator device can be applicable to optical fiber laser and the amplifier of band cladding light.
3, the large-power optical fiber collimator system of the band cladding light filtering function of the present invention, adopts space filtering cladding light, increases the area of cladding light filtering, it is to increase cladding light filtering ability.
4, the large-power optical fiber collimator system of the band cladding light filtering function of the present invention, adds the water-cooled assembly of fiber optic collimator device, it is to increase the ability of collimating lens process high power laser.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention.
Fig. 2 is the present invention's doubly clad optical fiber output terminal cap structure schematic diagram in embody rule example.
Fig. 3 is the present invention's light propagation principle schematic diagram in glass optical fiber end cap in embody rule example.
Fig. 4 is the present invention's light propagation principle schematic diagram in fiber optic collimator device in embody rule example.
Fig. 5 is the present invention's Water-cooling circulating unit construction schematic diagram in embody rule example.
Marginal data:
11, tail optical fiber fibre core; 14, core signal light; 15, clad pumping optical; 21, glass optical fiber end cap; 22, outgoing face; 23, cap fixture is held; 31, collimating lens encapsulation fixture; 32, high refractive index layers of absorbent material; 33, collimating lens; 41, water-cooled outer circulation passage; 42, tie point; 43, water-in; 44, inner cycle channel; 45, outer circulation passage; 46, water outlet.
Embodiment
Below with reference to Figure of description and specific embodiment, the present invention is described in further details.
As shown in Figure 1, the large-power optical fiber collimator system of the band cladding light filtering function of the present invention, comprises doubly clad optical fiber and exports tail optical fiber, glass optical fiber end cap and fixture, collimating lens and encapsulation device and Water-cooling circulating assembly. Doubly clad optical fiber prime does not need to do special processing, it is possible to be directly connected with double-clad output fibre tail optical fiber. Glass optical fiber end cap and fixture thereof comprise glass optical fiber end cap 21 and end cap fixture 23, and collimating lens and encapsulation device comprise collimating lens 33 and collimating lens encapsulation fixture 31; The tail optical fiber fibre core 11 of double-clad output fibre tail optical fiber is connected by welding with glass optical fiber end cap 21, and doubly clad optical fiber exports tail optical fiber 1 and glass optical fiber end cap 21 is all being held inside cap fixture 23 by the glue package that heat conduction is good; End cap fixture 23 and collimating lens and encapsulation device in collimating lens encapsulation fixture 31 connected by screw thread, utilize collimating lens 33 to realize the filtering to cladding light; Water-cooled outer circulation passage 45 in Water-cooling circulating assembly and collimating lens are encapsulated fixture 31 and are connected by the glue that screw thread and heat conduction are good, are used for collimation lens 33 and cool.
As shown in Figure 2, it is the structural representation of the present invention's glass optical fiber end cap and fixture thereof in embody rule example. First, doubly clad optical fiber exporting tail optical fiber stripping except coat, after clean, cutting exports end face. Utilize end cap welding system that the glass optical fiber end cap 21 after cleaning is fused to doubly clad optical fiber to export on tail optical fiber. Finally, doubly clad optical fiber exports tail optical fiber be encapsulated in together with glass optical fiber end cap 21 in end cap fixture 23. The glue adopting heat conduction good in the process of encapsulation, must ensure that the packaging area coat of tail optical fiber does not destroy simultaneously. See Fig. 2, there is shown the travel path of core signal light 14 and clad pumping optical 15 in doubly clad optical fiber. After two kinds of light enter into glass optical fiber end cap 21 from doubly clad optical fiber, owing to the two original waveguiding structure all destroys, disperse in glass optical fiber end cap 21 by respective numerical aperture. The numerical aperture of core signal light 14 is generally NA=0.06, and the corresponding space angle of divergence is �� �� 0.06; The numerical aperture of clad pumping optical 15 is generally NA=0.46, and the corresponding space angle of divergence is �� �� 0.46. Owing to the two angle of divergence exists very big difference, it is easy in the communication process of space separately.
As shown in Figure 3, it is the principle schematic of light propagation in glass optical fiber end cap 21 in embody rule example. For core signal light 14, adopt Gaussian beam model, owing to glass optical fiber end cap 21 specific refractory power is consistent with doubly clad optical fiber inner wrap material specific refractory power, thus very little with the difference of fiber core refractive index material, this just makes flashlight enter into the process reflection loss very little (figure A point) of glass optical fiber end cap 21 from the tail optical fiber fibre core 11 of doubly clad optical fiber output tail optical fiber. After light enters into glass optical fiber end cap 21, owing to original waveguiding structure has not existed, light will be dispersed gradually along propagation direction, and as shown in curve in figure (the transmitting curve near A point), degree of divergence is determined by fibre core numerical aperture. When light propagates into outgoing face the 22 of glass optical fiber end cap 21, anti-reflection film process can significantly reduce Hui Guang. But owing to air refraction can be regarded as 1, need thus from glass optical fiber end cap 21 to the communication process of air to consider refraction. Refraction effect increases the angle of divergence of emergent light, and as shown in curve in figure (the transmitting curve away from A point), thus from space, the focus position of light has changed to B point by A point. Clad pumping optical 15 has similar propagation law, but due to numerical aperture relatively big, light communication theory can be adopted when analyzing.
As shown in Figure 4, it is the structural representation of the present invention's collimating lens and encapsulation device in embody rule example. First, the absorbing material that the internal surface at collimating lens encapsulation fixture 31 applies one layer of high refractive index forms high refractive index layers of absorbent material 32, in order to guarantee the abundant absorption to clad pumping optical 15, in addition it is also necessary to it is carried out coarse process. Then, collimating lens 33 is encapsulated in collimating lens encapsulation fixture 31, and the focus ensureing collimating lens 33 drops near above-mentioned B point. Finally, end cap fixture 23 and collimating lens are encapsulated fixture 31 to be connected by screw thread. Screw thread has enough length and precision, it is possible to realize the adjustment in certain limit, it is possible to exported by the collimation regulating screw thread to realize laser.
As shown in Figure 5, it is the structural representation of the present invention's Water-cooling circulating assembly in embody rule example. Water-cooling circulating assembly comprises water-in 43, inner cycle channel 44, outer circulation passage 45 and water outlet 46. Water-cooling circulating system encapsulates what fixture 31 linked together by screw thread and collimating lens, and utilizes glue screw thread and tie point 42 to be sealed, and forms water circulation channel. Its main operational principle is: the water coolant of low temperature enters inner cycle channel 44 from water-in 43, and collimation lens packages fixture 31 carries out water-cooled process, then enters outer circulation passage 45, finally discharges from water outlet 46.
As from the foregoing, the present invention is separated with clad pumping optical 15 implementation space by the high power fiber laser of band cladding light exports core signal light 14 in light, utilizing fiber optic collimator device to realize the filtering to cladding light, collimation lens 33 carry out water-cooled simultaneously, it is achieved high-power signal light output.
In the middle of the present invention, the output of high-power double-cladding optical-fiber laser changes welding glass optical fiber end cap 21 into by original direct output and exports. On the one hand, after welding glass optical fiber end cap 21, light field is dispersed in glass optical fiber end cap 21, it is possible to effectively increases and exports end face light field area, thus reduces optical power density; On the other hand, the output end face of glass optical fiber end cap 21 adopts anti-reflection film process, it is to increase output light transmission rate, effectively inhibits Hui Guang.
Traditional cladding light filtering is directly processed by doubly clad optical fiber, and this kind of filtering mode is limited to optical fiber inner cladding dimensions, carries out filtering in this way because adopting, and heat can accumulate at inner cladding near zone, it is very difficult to realizes high power handling ability. And the present invention adopts space cladding light filtering mode, the core signal light 14 in output optical fibre and clad pumping optical 15 are disregarded, allow the two be exported by glass optical fiber end cap 21 simultaneously. Owing to the two numerical aperture is widely different, can propagate with the different angles of divergence in space after exporting from glass optical fiber end cap 21. When core signal light 14 and clad pumping optical 15 are after certain distance is propagated in space, the two can separate in space, now again by optionally filtering clad pumping optical 15, it is possible to reach the object of cladding light filtering equally. But Comparatively speaking, this kind of processing mode completes in space, does not limit by inner cladding dimensions, thus there is stronger superpower filtering ability.
Further, collimating lens in fiber optic collimator device 33 is carried out water-cooled process by the present invention, is dispelled the heat by collimation lens 33, reduces the distortion of collimating lens 33 under high power conditions, it is to increase the superpower ability to bear of fiber optic collimator device.
Below being only the preferred embodiment of the present invention, protection scope of the present invention is also not only confined to above-described embodiment, and all technical schemes belonged under thinking of the present invention all belong to protection scope of the present invention. It is noted that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention, should be considered as protection scope of the present invention.

Claims (5)

1. the large-power optical fiber collimator system of a band cladding light filtering function, it is characterised in that, comprise doubly clad optical fiber and export tail optical fiber, glass optical fiber end cap and fixture, collimating lens and encapsulation device and Water-cooling circulating assembly; Described glass optical fiber end cap and fixture thereof comprise glass optical fiber end cap (21) and end cap fixture (23), and described collimating lens and encapsulation device comprise collimating lens (33) and collimating lens encapsulation fixture (31); The tail optical fiber fibre core (11) of described double-clad output fibre tail optical fiber is connected by welding with glass optical fiber end cap (21), collimating lens encapsulation fixture (31) in described end cap fixture (23) and collimating lens and encapsulation device is connected by screw thread, utilizes described collimating lens (33) to realize the filtering to cladding light; Described Water-cooling circulating assembly and collimating lens encapsulate fixture (31) and are connected and cool for collimation lens (33).
2. the large-power optical fiber collimator system of band cladding light filtering function according to claim 1, it is characterized in that, described doubly clad optical fiber exports tail optical fiber (1) and glass optical fiber end cap (21) glue package with thermal conductivity is holding cap fixture (23) the inside.
3. the large-power optical fiber collimator system of band cladding light filtering function according to claim 1 and 2, it is characterized in that, the absorbing material that the internal surface of described collimating lens encapsulation fixture 31 applies one layer of high refractive index forms high refractive index layers of absorbent material (32).
4. the large-power optical fiber collimator system of band cladding light filtering function according to claim 1 and 2, it is characterized in that, described Water-cooling circulating assembly comprises water-in (43), inner cycle channel (44), outer circulation passage (45) and water outlet (46), described water-cooled outer circulation passage (45) encapsulates fixture (31) with collimating lens and is connected, water coolant enters inner cycle channel (44) from described water-in (43), collimation lens packages fixture (31) carries out water-cooled process, then described outer circulation passage (45) is entered, finally discharge from described water outlet (46).
5. the large-power optical fiber collimator system of band cladding light filtering function according to claim 4, it is characterised in that, described water-cooled outer circulation passage (45) is encapsulated fixture (31) with collimating lens and is connected by screw thread and the glue with thermal conductivity.
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Cited By (9)

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Publication number Priority date Publication date Assignee Title
CN107689541A (en) * 2017-10-25 2018-02-13 中国人民解放军国防科技大学 Defocusing compensation type high-power narrow-linewidth linearly polarized optical fiber laser generation system
CN107861193A (en) * 2017-11-07 2018-03-30 大族激光科技产业集团股份有限公司 Optical-fiber bundling device and preparation method thereof, abatement optical fiber return reflective method and semiconductor laser
CN109604845A (en) * 2018-11-26 2019-04-12 苏州钋镭自动化科技有限公司 A kind of extinction cooling system of the optical entrance for laser cutting head
CN110412691A (en) * 2019-09-06 2019-11-05 珠海光库科技股份有限公司 Collimator and laser
CN110471144A (en) * 2019-08-07 2019-11-19 北京工业大学 A kind of myriawatt grade optical fiber connector of anaberration
TWI723942B (en) * 2020-09-02 2021-04-01 國家中山科學研究院 High-power all-fiber type anti-reflection device
TWI726532B (en) * 2018-12-13 2021-05-01 美商Ｅｃｉ科技股份公司 Axially adjusted, non-rotating barrel fiber collimator
US10996396B2 (en) 2018-01-01 2021-05-04 Elbit Systems Electro-Optics - Elop Ltd. Endcap, assembly and method for improving accuracy in fiber-endcap-fixture alignment
CN113050225A (en) * 2021-06-02 2021-06-29 北京凯普林光电科技股份有限公司 Optical fiber connector structure with anti-reflection function

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CN103490273A (en) * 2013-10-10 2014-01-01 武汉锐科光纤激光器技术有限责任公司 High-power optical fiber transmission system
CN103676051A (en) * 2013-11-29 2014-03-26 深圳市创鑫激光技术有限公司 Myriawatt-level high-power optical fiber end cap
CN203519869U (en) * 2013-10-09 2014-04-02 深圳朗光科技有限公司 Fiber packaging structure

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CN102902030A (en) * 2011-07-29 2013-01-30 山西飞虹激光科技有限公司 Energy transfer optical cable for high-power laser transmission
WO2013083275A1 (en) * 2011-12-07 2013-06-13 Jenoptik Laser Gmbh Light guide comprising an optical fiber and a mode stripper
CN203519869U (en) * 2013-10-09 2014-04-02 深圳朗光科技有限公司 Fiber packaging structure
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107689541A (en) * 2017-10-25 2018-02-13 中国人民解放军国防科技大学 Defocusing compensation type high-power narrow-linewidth linearly polarized optical fiber laser generation system
CN107861193A (en) * 2017-11-07 2018-03-30 大族激光科技产业集团股份有限公司 Optical-fiber bundling device and preparation method thereof, abatement optical fiber return reflective method and semiconductor laser
US10996396B2 (en) 2018-01-01 2021-05-04 Elbit Systems Electro-Optics - Elop Ltd. Endcap, assembly and method for improving accuracy in fiber-endcap-fixture alignment
CN109604845A (en) * 2018-11-26 2019-04-12 苏州钋镭自动化科技有限公司 A kind of extinction cooling system of the optical entrance for laser cutting head
TWI726532B (en) * 2018-12-13 2021-05-01 美商Ｅｃｉ科技股份公司 Axially adjusted, non-rotating barrel fiber collimator
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CN110471144A (en) * 2019-08-07 2019-11-19 北京工业大学 A kind of myriawatt grade optical fiber connector of anaberration
CN110471144B (en) * 2019-08-07 2020-11-03 北京工业大学 Aberration-eliminating myriawatt-level optical fiber connector
CN110412691A (en) * 2019-09-06 2019-11-05 珠海光库科技股份有限公司 Collimator and laser
TWI723942B (en) * 2020-09-02 2021-04-01 國家中山科學研究院 High-power all-fiber type anti-reflection device
CN113050225A (en) * 2021-06-02 2021-06-29 北京凯普林光电科技股份有限公司 Optical fiber connector structure with anti-reflection function

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