CN203734128U - Large-power laser output head - Google Patents
Large-power laser output head Download PDFInfo
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- CN203734128U CN203734128U CN201420025815.0U CN201420025815U CN203734128U CN 203734128 U CN203734128 U CN 203734128U CN 201420025815 U CN201420025815 U CN 201420025815U CN 203734128 U CN203734128 U CN 203734128U
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- power laser
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Abstract
The utility model relates to the technical field of laser industry including laser cutting, laser welding and laser surface treatment, especially to a large-power laser output head which can be applied to a high-power laser system. The large-power laser output head comprises a transmission fiber, a beam expanding rod and a beam expanding fiber, wherein the beam expanding fiber is arranged between the transmission fiber and the fiber expanding rod. The large-power laser output head is characterized in that the transmission fiber, the beam expanding rod and the beam expanding fiber are connected to form a beam expanding fiber assembly, the side surface of the fiber expanding fiber assembly is provided with an inductor, the beam expanding rod is placed in a condenser, and the front end surface of the beam expanding rod faces a collimating lens. The large-power laser output head solves the problems including that the light-beam quality is reduced and the mechanical strength is not sufficient after light spots are enlarged, increase of the diameters of the light spots is limited, light-spot beam expanding cannot be carried out in a batch manner, the equipment cost and complexity are continuously increased, the laser damage threshold is low, detection of monitoring points is lagged, physical quantity is single, the cost is high, and the performance is low.
Description
Technical field
The utility model relates to the laser industrial technology fields such as laser cutting, laser welding, Laser Surface Treatment, relates in particular to a kind of high power laser delivery that can be used for high power laser system.
Background technology
The front continuous lifting along with high-capacity optical fiber laser power output, more and more higher to the requirement of fiber-optic output mouth.China is limited to the level of material and device, at present only can steady production kilowatt with interior high-capacity optical fiber laser, from external level now, still have big gap.Optical fiber itself is very high to the anti-damage threshold of laser, if but laser only in optical fiber transmission and do not derive, lose the meaning of its existence.With regard to current technical scheme, be conventionally referred to as beam expanding technology, thereby be to expand spot size, greatly to reduce output end face power density in one section of coreless fiber of output welding of Transmission Fibers.But with current welder, be difficult to guarantee that size when coreless fiber still obtains reliable and stable welding when enough large, thereby main manifestations is fusion point intensity, be difficult to guarantee poor reliability, thereby the fibre diameter difference at fusion point two ends is excessive, the fusion point beam quality that causes of poor quality reduces greatly; These defects are along with the change of coreless fiber is greatly further obvious.If cannot guarantee but coreless fiber is large not, output facula is big or small, have the risk of damaging because power density is excessive.Now, equipment can not provide stable volume production possibility, further bring to power tolerance limit.Although, the processing that surface is almost ideal and selection are not coated with anti-reflection film and power margin can be performed to the ultimate attainment of this kind of technology, but so not only lost approximately 4% luminous power, caused other insoluble negative issue: high heat history, heat history and the too high formed thermal effect of power density and field effect are fatal to output end face and device architecture under high power very simultaneously.
Utility model content
The purpose of this utility model is in order to overcome the deficiencies in the prior art, and a kind of high power laser delivery is provided, and having solved current fiber laser delivery cannot reliable and stable operation and the effective problem of volume production.
The utility model is achieved through the following technical solutions: a kind of high power laser delivery, comprise Transmission Fibers, expand rod and be arranged in Transmission Fibers and expand the expanded core fiber between rod, described Transmission Fibers, expand rod, expanded core fiber connects to form expanded core fiber assembly, and be provided with inductor in expanded core fiber assembly side, the described rod that expands is arranged in condenser, expands nose face over against collimating lens.
Further, described expanded core fiber is transition connecting portion, connects Transmission Fibers and expands rod.
Further, described in expand the clava that rod is comprised of transparent material, and described in to expand rod be tubaeform end with the link of expanded core fiber.
Further, described inductor is temperature sensor or power detector.
Further, described condenser is provided with water inlet expanding an excellent side, is provided with delivery port expanding excellent opposite side.
Further, described Transmission Fibers, expanded core fiber, expand rod, inductor, condenser, collimating lens and be arranged in peripheral packaging part.
Compared with prior art, the beneficial effects of the utility model are: the utility model greatly reduces welding difficulty and made damage threshold by the rod that expands of one section of special construction of welding, reliability, performance, can greatly improve by production, thereby when anxious by the mode of water-cooled, take away the heat that may accumulate and guarantee Laser output head part, always work in safe temperature range, and improved tight temperature sensing, power detection mode, comprehensive, the instant operating state of feedback laser delivery rapidly, the structure that this utility model is disclosed has low cost, high reliability, hot spot expands arbitrarily, transmitance is high, good beam quality, assemble simple and easy, damage threshold is controlled, working limit is high, feedback in time, handling safety, the plurality of advantages such as flexible design.In a word, the Laser output header structure that the utility model discloses, is the good solution of manufacture high-capacity optical fiber laser, can extremely be widely used in a variety of other lasers of different capacity level and scientific research, national defence purposes.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of high power laser delivery of the utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.
As shown in Figure 1, the utility model relates to a kind of high power laser delivery that can be used for high power laser system, comprise Transmission Fibers 5, expand rod 7 and be arranged in Transmission Fibers 5 and expand the expanded core fiber 6 between rod 7, described Transmission Fibers 5, expand rod 7, expanded core fiber 6 connects to form expanded core fiber assembly, and be provided with inductor 1 in expanded core fiber assembly side, the described rod 7 that expands is arranged in condenser 4, expand excellent 7 front end faces over against collimating lens 8, described expanded core fiber 6 is transition connecting portion, connect Transmission Fibers 5 and expand rod 7, described rod 7 clavas that formed by transparent material that expand, and described in to expand rod 7 be tubaeform end 9 with the link of expanded core fiber 6, described inductor 1 is temperature sensor or power detector, described condenser 4 expand rod 7 one sides be provided with water inlet 2, at the opposite side that expands rod 7, be provided with delivery port 3, described Transmission Fibers 5, expanded core fiber 6, expand rod 7, inductor 1, condenser 4, collimating lens 8 is arranged in peripheral packaging part 10.
Embodiment 1
Transmission Fibers 5, expanded core fiber 6 with expand the common expanded core fiber assemblies that form of rod 7, within expanded core fiber assembly is arranged on the condenser 4 of hollow, and condenser 4 is provided with water inlet 2 and delivery port 3, inductor 1 is installed on described expanded core fiber assembly side, collimating lens 8 is installed on excellent 7 front ends that expand of described expanded core fiber assembly, wherein, Transmission Fibers 5 can be the optical fiber of any kind, also can be polarization maintaining optical fibre, can there is any fibre core size and cladding diameter size, expanded core fiber 6 is material homogeneous, refractive index and softening point are close or identical with fibre core or the covering of Transmission Fibers 5, diameter approaches with the diameter of Transmission Fibers 5 or identical vitreous fibre, can be quartzy to the doping of optical transparency, fused quartz or other glass materials.It should be noted that herein expanded core fiber 6 is as transition portion, characterisitic parameter should be between Transmission Fibers 5 and following expanding between rod 7, low with fusion point performance and the reliability avoiding causing because property difference is excessive.Meanwhile, because the welding that may exist is bad or expand the deviation of excellent 7 machining accuracies, which allows to expand rod 7 and is easy to utilize and maybe can repeats processing and utilization.This has guaranteed the optimization of cost.On the other hand, the cladding diameter when Transmission Fibers 5 with expand rod 7 until welding end diameter approach, physical characteristics of materials is when similar, to welder, the less demanding special case of process equipment, can omit expanded core fiber 6.Expand rod 7 material and can be fused quartz, any glass and doping and to the transparent material of operation wavelength.Expanding rod 7 version, can be as shown in Figure 1 tapered bar-shaped, can be also diameter ladder increase bar-shaped, can also be simple long directly bar-shaped.Its effect is that the assembly forming after expanded core fiber 6 weldings with Transmission Fibers 5 is combined with melting, thereby make to disperse at a certain angle and gradually become large through expanded core fiber 6 from the light of Transmission Fibers 5 outputs, according to concrete technological level and user demand, reasonable in design expand excellent length and just can obtain the spot size of demand.Because the length of rod and profile are easy to control, can obtain in principle any spot size of wanting, this large quantum jump the power margin of existing process.Example of the present utility model, just has expanded hot spot approximately 70 times, means that power capability has strengthened 4900 times! With 1/2 of damage threshold, calculate, the product that this example is corresponding can bear approximately 25000 watts of continuous powers, and the pulse laser that is 20ns for pulsewidth, the single pulse energy that can bear is about 50mJ.The simple fiber docking that this uses in current technique expands, be inconceivable.And strengthen simply the diameter of optical fiber, and not only cost significantly rises, uses limitation greatly to increase, and the requirement of equipment performance is also increased greatly, and importantly, reliability and repeatability greatly reduce.
Embodiment 2
Expanded core fiber 6 one end of formed assembly after precise finiss polishing Transmission Fibers 5 and expanded core fiber 6 weldings, expand all precise finiss polishings of excellent 7 two ends, its one end plates high-quality anti-reflection film, expand rod 7 not one end and expanded core fiber closely crimping of suitable mechanical structure (can be the structure that similar fiber active linker fiber end face docks) for 6 surface polishings of plated film, make not exist air dielectric between the two.Owing to there not being air dielectric, and expanded core fiber 6 is to expand rod 7 physical characteristic similar, the light transmission rate of the welding that can obtain matching in excellence or beauty.This scheme is very simple to expanding rod 7 shape need, and long straight rod just can meet application, in application more convenient flexibly, still less to equipment dependence simultaneously.When inductor 1 is temperature sensor, temperature sensor can be any type of temperature-sensitive element, as thermistor, the temperature of periphery can be passed to analytic unit with another physical quantity by wire; When inductor 1 is power detector, power detector can be any type of photodetector, can convert light energy to the signal of telecommunication, passes to analytic unit equally by wire.Their common responsibility is to help analytic unit monitoring peripheral temperature or scattered light to have or not sudden change and abnormal, thereby determines for the whether dangerous existence of analytic unit decision-making system whether starting protection program is as turn-offed Laser output.The power detector that the utility model is advocated can greatly improve than temperature sensor on temporal sensitivity, is one of advance of the present utility model; Meanwhile, the utility model is also advocated temperature sensor and power detector collaborative work, has the advantage of the two concurrently, also can play the effect of duplicate protection simultaneously, is again that another one of the present utility model is advanced.Condenser 4 can be anyly to have good heat radiating, be difficult for the metal material that burn into has good mechanical processing characteristics, different parts at condenser 4 leaves water inlet 2 and delivery port 3, by outside, supply water, make current through the cavity of hollow cold condenser 4, the heat that condenser 4 is absorbed is derived, thereby guarantees that Laser output head is operated in controlled temperature range.Condenser 4 should be able to directly absorb reverberation and the scattered light of each optical interface in shape design, and makes in design the wall of cavity thin as far as possible on the basis that guarantees mechanical strength.Collimating lens 8 is positive lenss that the light with certain angle of divergence that described expanded core fiber assembly can be sent collimates, if its focal length is F, the far-field divergence angle full-shape of the light that expanded core fiber assembly sends is A, spot diameter=F*A.The utility model for embodiment adopt planoconvex spotlight, material selection fused quartz, to reducing preferably thermal lensing effect in lower-cost prerequisite.Peripheral packaging part 10 is for by described functional unit relative closure and firmly form organic whole.
Embodiment 3
Transmission Fibers 5 use peeling tools are divested to the overlay of certain length, clean, and at certain length place cutting optical fibre, make to form smooth bright and clean end face with optical fiber cutting equipment, according to practical application, can consider angle cutting.Put into optical fiber splicer stand-by, if Transmission Fibers 5 cladding diameters are larger, select the optical fiber splicer of coupling.But the utility model reaches very high laser damage threshold, not needing very large fiber cladding diameter, is outstanding advantages of the present utility model.Expanded core fiber 6 can, with processing the similar disposal methods of Transmission Fibers 5, be put into optical fiber splicer and Transmission Fibers 5 weldings by the expanded core fiber after flat cut 6.Because Transmission Fibers 5 has similar physical property with expanded core fiber 6, they can complete the as far as possible little reliable welding of deformation under relatively simple welding condition.Described Transmission Fibers 5 and the assembly of expanded core fiber 6 are cleaned, and with optical fiber cutting equipment making to form smooth bright and clean end face apart from fusion point certain length place cutting expanded core fiber 6, according to practical application, can consider angle cutting.Put into optical fiber splicer stand-by.Expand rod 7 use pressing molds, cutting or the method such as round as a ball processes, overall dimension basis calculates.At certain length place, make external diameter be that taper diminishes gradually and by the angle high-precision grinding and polishing identical with Transmission Fibers 5 and expanded core fiber 6 cutting angles, convenient in technique, can require to be ground to expanded core fiber 6 cladding diameter sizes similar.Expand for convenience precise angle grinding and polishing on demand of rod another large-sized end face of 7, clean and plate high-quality anti-reflection film.To expand excellent 7 small ends and strictly clean and check end face.With the custom-designed clamping device clamping that expands rod 7, expand rod 7 and put into optical fiber splicer and the assembly welding of Transmission Fibers 5 with expanded core fiber 6.Because expanded core fiber 6 with expand that excellent 7 phase weld external diameter sizes are similar, thereby materials similar softening point is similar, thereby can form that distortion is little, stress is little, the fusion point of several areflexias in interface, almost Perfect that adhesion is strong guarantees yields, excellent properties, reliability and can production.Herein, expanding excellent 7 profiles becomes gradually large ingenious structural design and makes the advantage of this utility model fairly obvious, with requiring minimum similar (close to symmetry) welding, obtain comparing asymmetric welding and the large much higher reliability of cladding diameter fused fiber splice quality and the performance that equipment requirement is very high, not only economy and facility but also reliable in quality.In implementation process, strict clean condenser 4 is inserted in to above-mentioned Transmission Fibers 5, expanded core fiber 6 and expands the assembly that expands that excellent 7 weldings form, and fill seam and solidify with suitable adhesive, guarantee that sealing is to prevent external steam possible in follow-up use procedure, contamination by dust coated optics face.At spare interface place, add respectively water inlet 2 and delivery port 3, and with marine glue sealing is fixing, welded seal is fixed or mechanical means sealing is fixing.In implementation process, for reducing as far as possible the end face reflection of collimating lens 8, must finally plate high-quality anti-reflection film in its former and later two optics end face precise finiss polishings strict clean, anti-reflection film reflectivity is the smaller the better, with good inhibitory reflex light.Under high-power service condition, even if the very reflection of small scale all likely causes very high accumulation of heat.To prepare collimating lens 8 is sealingly fastened on a metalwork, dock with hollow cold condenser 4 debugging after above-mentioned assembling, and relative position before and after assisting to regulate with laser beam analyzer and power meter, the spot size that makes to obtain, the hot spot angle of divergence, some precision, beam quality, transmitance etc. reach requirement.Bridging method can be welding, glued joint, machinery is fixing etc.All must note sealing.When machinery is fixedly time, must be aided with sealing gasket or sealing ring.But no matter which kind of mode all should notice that bridge joint place avoids laser light scattering or echo area as far as possible.The elimination that should also be noted that bridge joint stress after bridge joint is reliable to guarantee Stability Analysis of Structures.In implementation process, preformed hole position the machinery of temperature sensor and/or power detector insertion condenser 4 is fixing.Drawing two wires of different colours distinguishes to show difference and the polarity of transducer or detector.For attractive in appearance and be easy to management, additional suitable outer package and armoured cable skin are with protection Transmission Fibers 5 and temperature sensor and/or power detector and wire thereof.
The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.
Claims (6)
1. a high power laser delivery, comprise Transmission Fibers, expand rod and be arranged in Transmission Fibers and expand the expanded core fiber between rod, it is characterized in that, described Transmission Fibers, expand rod, expanded core fiber connects to form expanded core fiber assembly, and be provided with inductor in expanded core fiber assembly side, the described rod that expands is arranged in condenser, expands nose face over against collimating lens.
2. a kind of high power laser delivery according to claim 1, is characterized in that, described expanded core fiber is transition connecting portion, connects Transmission Fibers and expands rod.
3. a kind of high power laser delivery according to claim 1, is characterized in that, described in expand the clava that rod is comprised of transparent material, and described in to expand rod be tubaeform end with the link of expanded core fiber.
4. a kind of high power laser delivery according to claim 1, is characterized in that, described inductor is temperature sensor or power detector.
5. a kind of high power laser delivery according to claim 1, is characterized in that, described condenser is provided with water inlet expanding an excellent side, is provided with delivery port expanding excellent opposite side.
6. a kind of high power laser delivery according to claim 1, is characterized in that, described Transmission Fibers, expanded core fiber, expands rod, inductor, condenser, collimating lens and is arranged in peripheral packaging part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420025815.0U CN203734128U (en) | 2014-01-15 | 2014-01-15 | Large-power laser output head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420025815.0U CN203734128U (en) | 2014-01-15 | 2014-01-15 | Large-power laser output head |
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| Publication Number | Publication Date |
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| CN203734128U true CN203734128U (en) | 2014-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420025815.0U Expired - Fee Related CN203734128U (en) | 2014-01-15 | 2014-01-15 | Large-power laser output head |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882770A (en) * | 2015-06-10 | 2015-09-02 | 北京工业大学 | Fiber laser output head having light beam focusing characteristic and power monitoring function |
| CN105490158A (en) * | 2015-12-24 | 2016-04-13 | 北京工业大学 | Super-continuum spectrum optical fiber laser output apparatus and laser system |
| CN105977778A (en) * | 2016-06-28 | 2016-09-28 | 南京先进激光技术研究院 | Fiber laser output head |
| CN109390842A (en) * | 2017-08-10 | 2019-02-26 | 大族激光科技产业集团股份有限公司 | The processing method and optical fiber laser of the vacant input return light of branch of pump combiner |
| CN113067236A (en) * | 2021-02-24 | 2021-07-02 | 武汉锐科光纤激光技术股份有限公司 | Laser output head |
-
2014
- 2014-01-15 CN CN201420025815.0U patent/CN203734128U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882770A (en) * | 2015-06-10 | 2015-09-02 | 北京工业大学 | Fiber laser output head having light beam focusing characteristic and power monitoring function |
| CN105490158A (en) * | 2015-12-24 | 2016-04-13 | 北京工业大学 | Super-continuum spectrum optical fiber laser output apparatus and laser system |
| CN105977778A (en) * | 2016-06-28 | 2016-09-28 | 南京先进激光技术研究院 | Fiber laser output head |
| CN109390842A (en) * | 2017-08-10 | 2019-02-26 | 大族激光科技产业集团股份有限公司 | The processing method and optical fiber laser of the vacant input return light of branch of pump combiner |
| CN113067236A (en) * | 2021-02-24 | 2021-07-02 | 武汉锐科光纤激光技术股份有限公司 | Laser output head |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140723 Termination date: 20210115 |