CN103487901A - Optical fiber laser bundle combining device - Google Patents
Optical fiber laser bundle combining device Download PDFInfo
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- CN103487901A CN103487901A CN201310446965.9A CN201310446965A CN103487901A CN 103487901 A CN103487901 A CN 103487901A CN 201310446965 A CN201310446965 A CN 201310446965A CN 103487901 A CN103487901 A CN 103487901A
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Abstract
The invention relates to an optical fiber laser bundle combining device. The optical fiber laser bundle combining device comprises a plurality of laser input optical fibers, an end cap, a mechanical piece and an optical cable. The optical fiber laser bundle combining device is characterized in that one ends of the laser input optical fibers are combined to be an optical fiber bundle through fused biconical taper, the optical fiber bundle is connected with the end cap in a welding mode, the optical fiber bundle and the end cap are fixed into the mechanical piece, and the laser input optical fibers are fixed into the optical cable to be combined into a whole. Due to the fact that the optical fiber bundle is connected with the end cap in a direct welding mode, the laser input optical fibers are combined to form the optical fiber bundle, loss is reduced, and optical quality deterioration caused by mode influences is reduced. According to the optical fiber laser bundle combining device, multiple functions such as laser bundle combination and laser transmission are achieved on one device, and the optical fiber laser bundle combining device has the advantages of being small in size, high in reliability, high in integration level and the like, and can achieve high power laser bundle combination on the basis that high optical quality is ensured.
Description
Technical field:
The invention belongs to the fiber laser technology field, relate to a kind of optical-fiber laser bundling device, the signal for by the input of multiplex high power laser instrument, synthesize an output, reaches the purpose that improves the fiber laser output power, guarantees beam quality simultaneously.
Technical background:
Fiber laser is the third generation new laser after traditional gas laser and solid state laser, there is the advantages such as compact conformation, life-span are long, non-maintaining, good beam quality, energy-conserving and environment-protective, be successfully applied to machining, medical treatment, automobile making and the field such as military.Along with the continuous expansion of its application, as laser instrument cutting and the welding of thick sheet metal in the industries such as automobile making, propagation manufacture, wish that the output power of fiber laser reaches thousands of watts to tens of kilowatts.
Although the output power of simple optical fiber has broken through 2000W at present, but only limit to laboratory level, and the restriction due to physical mechanisms such as the nonlinear effect in doped fiber and fire damages, the further lifting of simple optical fiber output power will be very difficult, and the ripe general power of single fiber laser power cell is in the 1500W left and right at present.
For improving the output power of fiber laser, this just need to be combined into a branch of output by a plurality of fiber laser power cells, mainly contains relevant synthetic and two kinds of methods of Incoherent beam combining.The relevant composite structure of fiber laser is comparatively complicated, and is difficult for regulating, and reliability, stability are not good, and report realizes that peak power, only for thousands of watts, is not suitable for being applied in the high-capacity optical fiber laser product both at home and abroad at present.The Incoherent beam combining of fiber laser mainly contains raster method, volume Bragg grating method etc., but these free space element precision prescribeies are high and poor stability, also are not suitable for manufacturing the high-capacity optical fiber laser product.
Traditional optic fiber power beam combiner generally adopts multifiber to draw cone, become a branch of, then with a fused fiber splice, last and optical patchcord welding, export as output terminal.This scheme is two parts due to optical-fiber bundling device and optical patchcord, make reliability greatly descend and cost very high; Owing to there being two fusion points, the loss of device is higher, for the above high power of 1KW, and the loss of every increase by 0.5%, device reliability, stability can descend more than 10%; Owing to there being very long one section multimode optical fiber in the middle of device, after overcoupling, beam quality greatly affects.
Summary of the invention:
Defect and problem that purpose of the present invention exists in order to overcome prior art, a kind of optical-fiber laser bundling device is provided, having overcome that relevant synthetic power is not high, poor stability, the synthetic beam quality of conventional power is poor, the high in cost of production defect problem, realized multiple laser, high power, high light beam quality synthesize.
The present invention relates to laser bundling device and the transmission system synthetic for fiber laser power, comprise the multi-path laser input signal, laser bundling device, high power end cap, and fixedly holder and the optical fiber cable of said apparatus.Described laser bundling device is characterized in that, input end is the multi-path laser signal, by passing through fused biconical taper, be combined into a branch of fibre bundle, by welding, make fibre bundle be combined with the output end cap, this fibre bundle and end cap are fixed in a mechanical parts, the multiple beams of optical fiber bundle is fixed in optical cable, makes and is combined into one.The present invention, by fibre bundle and the direct welding mode of end cap, makes multiple laser close bundle, has reduced loss, has reduced the beam quality deterioration that the pattern impact causes.This invention has realized the function of a plurality of devices on a device, has that volume is little, reliability is high, and the integrated level advantages of higher, can, on the basis that guarantees high light beam quality, realize that high power laser light closes bundle.
A kind of optical-fiber laser bundling device, comprise many laser input optical fibres, end cap, mechanical parts, optical cable, it is characterized in that: an end of many laser input optical fibres passes through fused biconical taper, be combined into a branch of fibre bundle, fibre bundle and end cap welding, and fibre bundle and end cap are fixed in a mechanical parts, many laser input optical fibres are fixed in optical cable, are combined into one.
The laser input optical fibre is single-mode fiber or multimode optical fiber.
The laser input optical fibre is single cladded-fiber, multi-clad, photonic crystal fiber, polarization maintaining optical fibre, multi-core fiber, fibre bundle or Active Optical Fiber.
One end of many laser input optical fibres is combined into a branch of fibre bundle by fused biconical taper, and the fibre bundle end makes its end face by cutting or grinding and polishing.
Many laser input optical fibres are beaten strand or wear in a sleeve pipe by rotation, are combined into a branch ofly, by melting, draw cone to make to be bonded to each other, and oxyhydrogen flame, graphite silk, laser or electrode discharge mode are used in the fused biconical taper heating; The mode of heating is direct heat contact or indirect thermal conduction.
After the fibre bundle end face, a direct and end cap welding, adopt oxyhydrogen flame, graphite silk, laser or the welding of electrode discharge mode.
The material of described end cap is high-purity fused quartz, calcium fluoride, it is mould to fluoridize, jewel, silicon or zinc selenide.
One end of described end cap and fibre bundle welding, an other end grinding and polishing is circular-arc, end face coating.
The present invention, by fibre bundle and the direct welding mode of end cap, makes many laser input optical fibres close bundle, reduces loss, reduces the beam quality deterioration that the pattern impact causes.The present invention has realized a plurality of functions such as sharp combiner and Laser Transmission on a device, has that volume is little, reliability is high, and the integrated level advantages of higher can, on the basis that guarantees high light beam quality, realize that high power laser light closes bundle.
The accompanying drawing explanation:
Fig. 1 be the embodiment of the present invention provide front view.
Fig. 2 is fibre bundle cutting rear end face schematic diagram of the present invention.
Fig. 3,4 is respectively laser propagation schematic diagram after fibre bundle of the present invention and end cap welding.
Fig. 5 is that 7 bundle laser of the present invention are at end cap end face light beam schematic diagram.
Embodiment:
As shown in Figure 1, the present invention includes many laser input optical fibres 16, end cap 11, mechanical parts 12, optical cable 13, one end of many laser input optical fibres 16, by fused biconical taper, is combined into a branch of fibre bundle 14, and fibre bundle 14 ends make its end face as shown in Figure 2 by cutting or grinding and polishing; Fibre bundle 14 and end cap 11 weldings, the other end grinding and polishing of end cap is circular-arc, end face coating; And fibre bundle 14 is fixed in a mechanical parts 12 with end cap 11, and many laser input optical fibres 16 are fixed in optical cable 13, are combined into one.Fused biconical taper adopts existing apparatus to realize.After fibre bundle and end cap welding, laser propagation as shown in Figure 3, Figure 4.
The fiber-optic signal that the laser input optical fibre of take is 7 is example, and its preparation method is as follows:
1, the doubly clad optical fiber that 7 road laser input optical fibres are core diameter 20um, cladding diameter 400um, NA=0.065, laser beam quality M2<1.2;
2, the doubly clad optical fiber that is core diameter 20um, cladding diameter 400um by 7 optical fiber, be through in a quartz socket tube, uses oxyhydrogen flame to draw the cone machine, and drawing the cone machine is existing apparatus, and make fibre bundle draw and bore to 300um, 7 optical fiber, single covering is 80um;
3, use this to draw the cone machine, cutting in the middle of the La Zhuizhui district, the cutting end plane angle is less than 0.5 °;
4,, the quartz pushrod two ends grinding and polishing of a 10mm, end face grinding and polishing roughness is less than 0.5nm, an end plating anti-reflection film, and the anti-reflection film transmitance is higher than 99.9%, and the surface damage threshold value is higher than 20J/cm
2.An other end and above-mentioned fibre bundle welding, welding adopts hydrogen, the welding of oxygen flame;
5, above-mentioned end cap and fibre bundle integral body are fixed in a copper pipe, copper pipe is fixed in a metal sleeve, and 7 laser input optical fibres are through in a metal armouring, and metal armouring is connected, is fixed into as a whole with metal sleeve.
6, the end cap exit end is fixed a laser radiation window, mode contamination by dust end cap end face.
Based on the method, we have successfully realized 7 bundle laser inputs, efficiency is greater than 99.8%, BPP<1.5, when 7 bundle laser are inputted simultaneously, the end cap end face is used CCD test hot spot to distribute, as shown in Figure 5, whole hot spot is evenly distributed, and there is no distorted, and the fine beam quality that guarantees every Shu Jiguang of the method is described.
The power bundling device of the equal classification in market, efficiency is greater than 98%, BPP<2.5, and the bundling device that our method is made improves a lot than its performance.
Claims (8)
1. an optical-fiber laser bundling device, comprise many laser input optical fibres, end cap, mechanical parts, optical cable, it is characterized in that: an end of many laser input optical fibres passes through fused biconical taper, be combined into a branch of fibre bundle, fibre bundle and end cap welding, and fibre bundle and end cap are fixed in a mechanical parts, many laser input optical fibres are fixed in optical cable, are combined into one.
2. optical-fiber laser bundling device as claimed in claim 1, it is characterized in that: the laser input optical fibre is single-mode fiber or multimode optical fiber.
3. optical-fiber laser bundling device as claimed in claim 1, it is characterized in that: the laser input optical fibre is single cladded-fiber, multi-clad, photonic crystal fiber, polarization maintaining optical fibre, multi-core fiber, fibre bundle or Active Optical Fiber.
4. optical-fiber laser bundling device as claimed in claim 1, it is characterized in that: an end of many laser input optical fibres is combined into a branch of fibre bundle by fused biconical taper, and the fibre bundle end makes its end face by cutting or grinding and polishing.
5. optical-fiber laser bundling device as described as claim 1 or 4, it is characterized in that: many laser input optical fibres are beaten strand or wear in a sleeve pipe by rotation, be combined into a branch of, by melting to draw to bore to make, be bonded to each other, oxyhydrogen flame, graphite silk, laser or electrode discharge mode are used in the fused biconical taper heating; The mode of heating is direct heat contact or indirect thermal conduction.
6. optical-fiber laser bundling device as claimed in claim 1, is characterized in that: a direct and end cap welding after the fibre bundle end face, employing oxyhydrogen flame, graphite silk, laser or the welding of electrode discharge mode.
7. optical-fiber laser bundling device as described as claim 1 or 6 is characterized in that: the material of described end cap is high-purity fused quartz, calcium fluoride, it is mould to fluoridize, jewel, silicon or zinc selenide.
8. optical-fiber laser bundling device as described as claim 1 or 6, it is characterized in that: an end of described end cap and fibre bundle welding, an other end grinding and polishing is circular-arc, end face coating.
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| CN201310446965.9A CN103487901A (en) | 2013-09-27 | 2013-09-27 | Optical fiber laser bundle combining device |
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| CN201310446965.9A CN103487901A (en) | 2013-09-27 | 2013-09-27 | Optical fiber laser bundle combining device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104035166A (en) * | 2014-05-23 | 2014-09-10 | 武汉锐科光纤激光器技术有限责任公司 | Multi-core optical fiber based high power laser beam combiner |
| CN105259615A (en) * | 2015-11-23 | 2016-01-20 | 北京东方锐镭科技有限公司 | 1*N optical switch |
| CN106054395A (en) * | 2016-07-22 | 2016-10-26 | 武汉锐科光纤激光技术股份有限公司 | Fiber combiner based on laser etching and preparation method thereof |
| CN106094112A (en) * | 2016-07-29 | 2016-11-09 | 濮阳光电产业技术研究院 | A kind of system preventing optical fiber pigtail light wave reflection |
| CN106646747A (en) * | 2017-01-03 | 2017-05-10 | 中国科学院上海光学精密机械研究所 | Method for manufacturing photonic crystal fiber integrated end caps |
| CN107861200A (en) * | 2017-11-30 | 2018-03-30 | 北京航空航天大学 | A kind of fiber coupling regulation of space laser for cold atom guiding and monitoring method |
| CN108387974A (en) * | 2018-05-02 | 2018-08-10 | 中国人民解放军国防科技大学 | High-power optical fiber laser receiving and transmitting integrated end cap |
| CN110045463A (en) * | 2018-01-15 | 2019-07-23 | 中国科学院上海光学精密机械研究所 | A kind of connector and method of fused fiber splice |
| CN111123533A (en) * | 2019-05-10 | 2020-05-08 | 杭州奥创光子技术有限公司 | Laser output head for spectrum beam combination and preparation method thereof |
| WO2021077572A1 (en) * | 2019-10-24 | 2021-04-29 | 武汉锐科光纤激光技术股份有限公司 | Method for changing laser output divergence angle |
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| CN105259615A (en) * | 2015-11-23 | 2016-01-20 | 北京东方锐镭科技有限公司 | 1*N optical switch |
| CN106054395A (en) * | 2016-07-22 | 2016-10-26 | 武汉锐科光纤激光技术股份有限公司 | Fiber combiner based on laser etching and preparation method thereof |
| CN106094112A (en) * | 2016-07-29 | 2016-11-09 | 濮阳光电产业技术研究院 | A kind of system preventing optical fiber pigtail light wave reflection |
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| CN107861200A (en) * | 2017-11-30 | 2018-03-30 | 北京航空航天大学 | A kind of fiber coupling regulation of space laser for cold atom guiding and monitoring method |
| CN110045463A (en) * | 2018-01-15 | 2019-07-23 | 中国科学院上海光学精密机械研究所 | A kind of connector and method of fused fiber splice |
| CN108387974A (en) * | 2018-05-02 | 2018-08-10 | 中国人民解放军国防科技大学 | High-power optical fiber laser receiving and transmitting integrated end cap |
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| CN111123533A (en) * | 2019-05-10 | 2020-05-08 | 杭州奥创光子技术有限公司 | Laser output head for spectrum beam combination and preparation method thereof |
| WO2021077572A1 (en) * | 2019-10-24 | 2021-04-29 | 武汉锐科光纤激光技术股份有限公司 | Method for changing laser output divergence angle |
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Application publication date: 20140101 |