CN101043118A - Method and apparatus for liquid guided pump beam - Google Patents
Method and apparatus for liquid guided pump beam Download PDFInfo
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- CN101043118A CN101043118A CN 200710086671 CN200710086671A CN101043118A CN 101043118 A CN101043118 A CN 101043118A CN 200710086671 CN200710086671 CN 200710086671 CN 200710086671 A CN200710086671 A CN 200710086671A CN 101043118 A CN101043118 A CN 101043118A
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- 239000007788 liquid Substances 0.000 title claims abstract description 76
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000012809 cooling fluid Substances 0.000 claims abstract description 34
- 230000003287 optical effect Effects 0.000 claims abstract description 20
- 230000008878 coupling Effects 0.000 claims abstract description 5
- 238000010168 coupling process Methods 0.000 claims abstract description 5
- 238000005859 coupling reaction Methods 0.000 claims abstract description 5
- 239000013307 optical fiber Substances 0.000 claims description 55
- 238000001816 cooling Methods 0.000 claims description 47
- 239000012530 fluid Substances 0.000 claims description 35
- 239000013078 crystal Substances 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 abstract description 17
- 239000000835 fiber Substances 0.000 abstract description 13
- 239000007787 solid Substances 0.000 abstract description 13
- 230000000694 effects Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 8
- 230000005855 radiation Effects 0.000 description 7
- 230000008646 thermal stress Effects 0.000 description 4
- 230000001976 improved effect Effects 0.000 description 3
- 238000003754 machining Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 241000931526 Acer campestre Species 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000005693 optoelectronics Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
A liquid leading pump beam method and device belongs to field of optics and laser photoelectron technique. It includes pumping light source, optical coupling device, liquid leading device and fiber. Thereinto: the optical coupling device receives the pumping light omitted by the pumping light source; liquid nozzle, the pumping beam coupled by the optical coupling device is coupled with liquid column spurted by the liquid nozzle; the central line of cooling fluid collector is aimed at the central line of the liquid nozzle; return flexible hose and liquid-in end are connected with the cooling fluid collector; radiator and circlulating pump are in series, the liquid-in port of the radiator and the liquid-out port of the return flexible hose are connected, the output end of the circlulating pump is connected with the lower end of the liquid nozzle; the liquid nozzle, the cooling fluid collector, the return flexible hose, the radiator and the circlulating pump are in series to form a liquid leading device. The invention resolves the high power pumping problem in solid laser and fiber laser, and the output power of laser can be increased, stability and reliability of laser system can be guaranteed.
Description
Technical field
The present invention relates to a kind of method and device of liquid lead beam, can be used for laserresonator and laser amplifier, belong to optics and laser optoelectronic technical field.
Background technology
In solid state laser and fiber laser field, when high power solid state laser and fiber laser work, need in gain media, inject a large amount of pump lights.
In the prior art of fiber laser, as shown in Figure 1, comprise pumping source 1, optical system 2, optical fiber 3 and heat sink 4.Pump beam is after compression is converged through optical system 2, is directly incident on the end face of optical fiber 3 and absorbed by optical fiber, and the optical fiber end heat distribution is concentrated, and the temperature height must cool off, otherwise can cause the optical fiber coating burning, can cause optical fiber end to burst when serious.The cooling of optical fiber end is particularly important in high-capacity optical fiber laser and high-power fiber amplifier.Cooling means commonly used in the prior art is that optical fiber end is placed in the metal heat sink 4, and the heat of optical fiber end sheds from heat sink by the contact conduction.Because in this radiating mode, heat sink the contacts side surfaces with optical fiber can only conduct cooling to optical fiber side, and the heat of fiber end face is the most concentrated, so radiating effect is not good; Side cooling simultaneously also makes optical fiber produce very uneven Temperature Distribution, and hot edge, center is cold, makes to form very big thermal gradient on the end face, and the bigger thermal effect of its generation causes the distortion of laser beam, reduces beam quality; The colder outside of optical fiber is restricting the inside expansion of heat, produces bigger mechanical stress in fine, can cause optical fiber to crack when serious.In addition, because fibre diameter small (less than 1mm) therefore, for guaranteeing heat radiation, must make the heat sink optical fiber generation stress that closely contacts with optical fiber side and can not too tightly make, therefore heat sink machining accuracy must be very high.
In the prior art of solid state laser, pump beam is directly or through inciding end face, side or other pump face of solid laser medium after the optical system.The incident end face heat distribution is concentrated, the temperature height, must cool off solid laser medium, otherwise the thermal effect that temperature difference causes in the laser medium active region can make the laser works instability, beam quality descends, and the thermal stress that temperature difference causes can make crystal produce deformation, and the overheated end face rete that easily causes burns easily, solid dielectric can burst when serious, the principal element of considering when therefore the reduction of high efficiency heat radiation and thermal effect normally designs the high-average power system.Cooling means commonly used has liquid cooling and conduction to cool off two kinds in the prior art, all is by crystal on side face being cooled off, can not solve crystal end-face and center problems of excessive heat, thereby radiating effect being not good; Because hot edge, center is cold, make that the Temperature Distribution of crystal is more inhomogeneous simultaneously, thermal effect and thermal stress can not effectively be reduced.As shown in Figure 2, the 5th, crystal, the conduction cooling is closely to contact with solid laser medium with metal heat sink 4, realize heat radiation by the contact conduction, because in this radiating mode, heat sink and cooling faying face quality solid laser medium is not very high (especially curved surface), so radiating effect is not good, for guaranteeing heat radiation, heat sink machining accuracy also must be very high.As shown in Figure 3, liquid cooling is because O RunddichtringO 17 will cover certain volume, so cooling fluid 6 impossible fully several mm lengths of crystals cooled end.
Summary of the invention
The objective of the invention is to propose a kind of method and device of liquid guiding pump beam, overcome in the prior art by the heat dissipation problem of pumping end surface, adopt the method and apparatus of liquid guiding pump beam, realization is by the good heat radiating of pumping end surface, improve the thermal gradient of end effectively, reduce thermal effect and thermal stress, make heat sink need of virgin metal mainly play clamping action, solved the contradiction of pumping laser injection with the mechanical grip structure, reduced the requirement on machining accuracy of clamp structure, thereby solved the high power pump problem in solid state laser and the fiber laser, guaranteed the stability and the reliability of Optical Maser System work.
One of feature of the present invention is, contains pump light source, optical couping device 8, liquid-conducting device 9 and optical fiber 3, wherein:
The closed circuit of the fluid column 15 that described fluid injector 10, cooling fluid collector 11, liquid back pipe 12, radiator 14 and circulating pump 13 serial connections constitute has formed a liquid-conducting device 9.
Described optical fiber 3 can replace with a whole laser crystal 16 that is immersed in the cooling fluid collector 11.
The length of the fluid column 15 that described fluid injector 10 produces is between 1 times to 10000 times of fluid column 15 diameters.
Two of feature of the present invention is, contains: pump light source, optical couping device 8, liquid-conducting device 9 and optical fiber 3, wherein:
Liquid-conducting device 9 contains: cooling sap cavity 17, liquid back pipe 12, radiator 14 and circulating pump 13, wherein:
The closed-loop path of the cooling fluid 6 that described cooling sap cavity 17, radiator 14 and circulating pump 13 serial connections constitute has formed a liquid-conducting device.
Described optical fiber 3 can replace with a whole laser crystal 16 that is immersed in the cooling sap cavity 17.
The method and the device of the liquid guiding pump beam that the present invention proposes, owing to take above technical scheme, have the following advantages: the present invention adopts liquid that end face is cooled off, because the liquid thermal conductivity performance is good, therefore can take away rapidly by the heat of pumping end surface, good cooling results has solved the heat radiation difficult problem that prior art exists; Because whole end face is cooled off, improved the cold problem in intermediate heat edge, reduce thermal gradient, thereby reduced thermal effect and thermal stress, improved beam quality, reduced the deformation of end; Because adopt the liquid heat radiation good, therefore to being reduced by the required precision of the mechanical grip structure of pumping medium, structural design and system debug more easy; Cooling fluid can play the effect of refractive index match, reduces the reflection of pump light on end face, can also play the effect of filter plate, eliminates unwanted pumping radiation.Cooling means of the present invention and device are simple, implementation result is remarkable, solve the high power pump problem in solid state laser and the fiber laser, the output average power of laser is further improved, guaranteed the stability and the reliability of Optical Maser System work.All have broad application prospects at numerous areas.
Description of drawings
Fig. 1 is the pumping and the heat abstractor schematic diagram of end pumping fiber laser in the prior art.
Fig. 2 is the conduction cooling device schematic diagram of solid state laser in the prior art.
Fig. 3 is the liquid cooling apparatus schematic diagram of solid state laser in the prior art.
Fig. 4 is the method for liquid guided pump beam of the present invention and the first example structure schematic diagram of device.
Fig. 5 is the method for liquid guided pump beam of the present invention and the second example structure schematic diagram of device.
Fig. 6 is the method for liquid guided pump beam of the present invention and the 3rd example structure schematic diagram of device.
Fig. 7 is the method for liquid guided pump beam of the present invention and the 4th example structure schematic diagram of device.
Fig. 8 is the method for liquid guided pump beam of the present invention and the 5th example structure schematic diagram of device.
Embodiment
Below in conjunction with accompanying drawing the present invention is described.
The first embodiment of the present invention as shown in Figure 4, apparatus of the present invention comprise coupled system 8, liquid-conducting device 9, and the optical fiber 3 that is used to export.Liquid-conducting device 9 is by special fluid injector 10, cooling fluid collector 11, and liquid back pipe 12, circulating pump 13 and radiator 14 are formed.As shown in Figure 4, characteristics of the present invention are to be coupled in the fluid column 15 of nozzle ejection the pump light through coupled system 8 has the special fluid injector 10 of a transparent window by front end after, the center line of fluid column 15 is accurately aimed at the center line of optical fiber 3, one in a tubular form the back-end sealing of cooling fluid collector 11 is set on the optical fiber 3, the front end inlet of cooling fluid collector 11 leans out the input of optical fiber 3, and be open shape alignment liquid nozzle 10, between cooling fluid collector 11 and fluid injector 10 liquid feeding ends, a liquid back pipe 12 is set, one circulating pump 13 and radiator 14 are set on liquid back pipe 12, make whole cooling system form a cooling circuit.During apparatus of the present invention work, pressure fluid from fluid injector 10 ejections, form one section liquid column 15, pump light total internal reflection in liquid column 15 is directed into the input that is mapped to optical fiber 3, continue transmission by optical fiber 3, the liquid that is ejected into optical fiber 3 inputs is collected by cooling fluid collector 11, and cools off by radiator 14, and the input of getting back to fluid injector 10 through circulating pump 13 continues to recycle.The longest 10000 times of reaching the fluid column diameter of effective length of the liquid column 15 that the distance between fluid injector 10 and optical fiber 3 inputs is also promptly stable can be got suitable length according to actual conditions.Among this embodiment, incide in the process of optical fiber 3 end faces by liquid column 15 guided pump beams, liquid column is high more to the refractive index of pump beam wavelength, and liquid column guiding pumping luminous energy power is strong more; Liquid column is more little to the absorption coefficient of pump beam wavelength, and the power of liquid column absorptive pumping light is few more, and the power that can guide is high more; The specific heat of liquid column is big more, and liquid column is good more to the cooling effect of optical fiber 3 ends.Therefore, the liquid in the coolant circuit can adopt have high index (at least greater than 1), pumping wavelength is absorbed little, and the good liquid of cooling effect is such as water.In this embodiment, if pump light be the enough good laser of beam quality or other light beams of looking after and guiding can be without coupled system 8 directly incident nozzle 10 directly be coupled in the fluid column 15.
The second embodiment of the present invention as shown in Figure 5, apparatus of the present invention comprise the described coupled system 8 of first embodiment, liquid-conducting device 9, and the branch road optical fiber 3 in the fiber coupler.The device setting is described identical with the operation principle and first embodiment.
The third embodiment of the present invention as shown in Figure 6, apparatus of the present invention comprise the described coupled system 8 of first embodiment, liquid-conducting device 9, and laser crystal 3.The device setting is described identical with the operation principle and first embodiment.In addition, whole laser crystal is immersed in the cooling fluid collector 11 and realizes liquid cooling by cooling fluid 6, makes the side of crystal 5 also can obtain simple and effective cooling.
The fourth embodiment of the present invention as shown in Figure 7, apparatus of the present invention comprise coupled system 8, liquid-conducting device 9, and laser crystal 16.Liquid-conducting device 9 is by liquid back pipe 12, circulating pump 13, and radiator 14 and cooling sap cavity 17 are formed.Characteristics of the present invention are coupled system 8 and cooling sap cavity 17 and crystal 16 common formation one closed chamber, the inside has been full of cooling fluid 6, on cooling sap cavity 17, be provided with liquid back pipe 12, one circulating pump 13 and radiator 14 are set on liquid back pipe 12, make whole cooling system form a cooling circuit.Pump light incides crystal 16 end faces through coupled system 8 and is absorbed by crystal.Almost whole laser crystal 16 all is immersed in the cooling fluid 6 thereby can obtains fully effectively cooling.
The fifth embodiment of the present invention as shown in Figure 8, apparatus of the present invention comprise coupled system 8, liquid-conducting device 9, and optical fiber 3.Liquid-conducting device 9 as described in the 4th embodiment by liquid back pipe 12, circulating pump 13, radiator 14 and cooling sap cavity 17 are formed.Characteristics of the present invention are coupled system 8 and cooling sap cavity 17 common formation one closed chamber, the inside has been full of cooling fluid 6, on cooling sap cavity 17, be provided with liquid back pipe 12, a circulating pump 13 and radiator 14 are set on liquid back pipe 12, make whole cooling system form a cooling circuit.Pump light incides fiber end face through coupled system 8 and is absorbed by optical fiber.Optical fiber end all is immersed in the cooling fluid thereby can obtains fully effectively cooling.
Claims (5)
1, the system of liquid guided pump beam is characterized in that containing pump light source, optical couping device (8), liquid-conducting device (9) and optical fiber (3), wherein:
Optical couping device (8) is accepted the pump light that pump light source is sent;
Fluid injector (10), the pump beam of process optical couping device (8) coupling is coupled in the fluid column (15) of described fluid injector (10) ejection by the transparent window of fluid injector (10) front end;
Cooling fluid collector (11), one end is the opening shape, the center line of the center line alignment liquid nozzle (10) of this cooling fluid collector, and the port of export of this cooling fluid collector (11) has inserted the input of optical fiber (3), is accurately aimed at the center line of optical fiber (3) by the center line of the fluid column (15) of fluid injector (10) ejection;
Liquid back pipe (12), liquid feeding end is communicated with the lower bottom part of cooling fluid collector (11);
Radiator (14) and circulating pump (13), series connection mutually, the inlet of this radiator (14) links to each other with the liquid outlet of described liquid back pipe (12), and the output of circulating pump (13) is communicated with the inlet of opening in described fluid injector (10) lower end through liquid back pipe (12);
The closed circuit of the fluid column (15) that described fluid injector (10), cooling fluid collector (11), liquid back pipe (12), radiator (14) and circulating pump (13) serial connection constitute has formed a liquid-conducting device (9).
2, the system of liquid guided pump beam according to claim 1 is characterized in that, the available whole laser crystal (16) that is immersed in the cooling fluid collector (11) of described optical fiber (3) replaces.
3, the system of liquid guided pump beam is characterized in that containing pump light source, optical couping device (8), liquid-conducting device (9) and optical fiber (3), wherein:
Optical fiber (3) has a laser output;
Liquid-conducting device (9) contains: cooling sap cavity (17), liquid back pipe (12), radiator (14) and circulating pump (13), wherein:
Cooling sap cavity (17), be full of cooling fluid (6) in the cavity, one end at optical fiber (3) place, input port passes by a side vertically of the cooling sap cavity (17) of O RunddichtringO (7) sealing and enters in the cavity, and be fixed on the cavity inner wall, the opposite side vertically of cooling sap cavity (17) links to each other with the output port of optical couping device (8), be coupled to behind the pump light process optical couping device (8) of pump light source output in the cooling fluid (6) in the cavity, longitudinal center line along optical fiber (3) incides on the port of optical fiber (3) input port again, enters optical fiber (3);
Radiator (14) and circulating pump (13), series connection mutually, radiator (14) is communicated with the bottom of cooling sap cavity (17) near laser output one side by liquid back pipe (12), and circulating pump (13) is communicated with the bottom of cooling sap cavity (17) near optical fiber input port one side by liquid back pipe (12);
The closed-loop path of the cooling fluid (6) that described cooling sap cavity (17), radiator (14) and circulating pump (13) serial connection constitute has formed a liquid-conducting device.
4, the system of liquid guided pump beam according to claim 3 is characterized in that: the available whole laser crystal (16) that is immersed in the cooling sap cavity (17) of described optical fiber (3) replaces.
5, the system of liquid guided pump beam according to claim 1 is characterized in that: the length of the fluid column (15) that described fluid injector (10) produces is between 1 times to 10000 times of fluid column (15) diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100866714A CN100452570C (en) | 2007-03-23 | 2007-03-30 | Method and apparatus for liquid guided pump beam |
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| CN200710064683.7 | 2007-03-23 | ||
| CN200710064683 | 2007-03-23 | ||
| CNB2007100866714A CN100452570C (en) | 2007-03-23 | 2007-03-30 | Method and apparatus for liquid guided pump beam |
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| CN101043118A true CN101043118A (en) | 2007-09-26 |
| CN100452570C CN100452570C (en) | 2009-01-14 |
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| WO2011130897A1 (en) * | 2010-04-19 | 2011-10-27 | 华中科技大学 | Disc-shaped solid laser |
| CN102244340A (en) * | 2011-05-24 | 2011-11-16 | 中国科学院上海光学精密机械研究所 | Cooling method of non-quartz fiber laser |
| CN102684044A (en) * | 2012-04-26 | 2012-09-19 | 深圳市创鑫激光技术有限公司 | Optical fiber laser and cooling method thereof |
| CN103199413A (en) * | 2013-03-29 | 2013-07-10 | 中国科学院半导体研究所 | Cooling method and cooling device of end pump laser |
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| EP2747218B1 (en) * | 2012-12-18 | 2021-08-25 | A.R.C. Laser GmbH | Cooling assembly for laser active solid materials, laser system and method for cooling a laser active solid material |
| CN115621820A (en) * | 2022-12-06 | 2023-01-17 | 武汉光谷航天三江激光产业技术研究院有限公司 | Linear polarization output laser structure for effectively compensating thermal depolarization effect |
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| US4657014A (en) * | 1985-03-11 | 1987-04-14 | Shiley, Inc. | Liquid interface fiberoptic coupler |
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| AU2002365559A1 (en) * | 2001-11-21 | 2003-06-10 | General Atomics | Laser containing a distributed gain medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011130897A1 (en) * | 2010-04-19 | 2011-10-27 | 华中科技大学 | Disc-shaped solid laser |
| CN102244340A (en) * | 2011-05-24 | 2011-11-16 | 中国科学院上海光学精密机械研究所 | Cooling method of non-quartz fiber laser |
| CN102684044A (en) * | 2012-04-26 | 2012-09-19 | 深圳市创鑫激光技术有限公司 | Optical fiber laser and cooling method thereof |
| EP2747218B1 (en) * | 2012-12-18 | 2021-08-25 | A.R.C. Laser GmbH | Cooling assembly for laser active solid materials, laser system and method for cooling a laser active solid material |
| CN103199413B (en) * | 2013-03-29 | 2015-08-26 | 中国科学院半导体研究所 | The cooling means of end-pumped laser and cooling device |
| CN103199413A (en) * | 2013-03-29 | 2013-07-10 | 中国科学院半导体研究所 | Cooling method and cooling device of end pump laser |
| CN104124604A (en) * | 2013-04-28 | 2014-10-29 | 深圳市大族激光科技股份有限公司 | Thin disc laser |
| CN104124604B (en) * | 2013-04-28 | 2018-07-06 | 大族激光科技产业集团股份有限公司 | Thin-sheet laser |
| WO2015081758A1 (en) * | 2013-12-05 | 2015-06-11 | 方强 | A high-power optical fiber head, collimator, isolator and frequency combiner |
| WO2016026377A1 (en) * | 2014-08-21 | 2016-02-25 | 方强 | Optical component with cooling function |
| CN111244733A (en) * | 2020-02-11 | 2020-06-05 | 中国工程物理研究院应用电子学研究所 | Variable-caliber multi-pass laser amplifier based on direct liquid cooling array distribution gain module |
| CN111244733B (en) * | 2020-02-11 | 2021-08-10 | 中国工程物理研究院应用电子学研究所 | Variable-caliber multi-pass laser amplifier based on direct liquid cooling array distribution gain module |
| CN111478175A (en) * | 2020-06-02 | 2020-07-31 | 福州市纳飞光电科技有限公司 | Laser energy amplifier |
| CN115621820A (en) * | 2022-12-06 | 2023-01-17 | 武汉光谷航天三江激光产业技术研究院有限公司 | Linear polarization output laser structure for effectively compensating thermal depolarization effect |
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