CN110829157B - Fiber laser cooling device and method based on flowing low-boiling-point liquid - Google Patents
Fiber laser cooling device and method based on flowing low-boiling-point liquid Download PDFInfo
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- CN110829157B CN110829157B CN201911005430.1A CN201911005430A CN110829157B CN 110829157 B CN110829157 B CN 110829157B CN 201911005430 A CN201911005430 A CN 201911005430A CN 110829157 B CN110829157 B CN 110829157B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/0407—Liquid cooling, e.g. by water
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
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Abstract
The invention discloses a fiber laser cooling device based on flowing low-boiling point liquid, which comprises a bottom plate and a cover plate; the upper surface of the bottom plate is provided with a groove for placing the optical fiber laser device covered by the pouring sealant and the low boiling point liquid; the side surface of the bottom plate is provided with a low-boiling-point liquid inlet and a low-boiling-point liquid outlet; the low boiling point liquid inlet and the low boiling point liquid outlet are communicated with the groove; the side edge of the bottom plate is provided with an optical fiber input/output preformed hole; the cover plate is connected with the groove in a sealing way. The invention discloses a fiber laser cooling method based on flowing low-boiling point liquid. The invention can realize multidirectional cooling of each heating side surface of the fiber laser device.
Description
Technical Field
The invention belongs to the technical field of fiber lasers, and relates to a fiber laser cooling device and method based on flowing low-boiling-point liquid.
Background
The high-power fiber laser has wide application in the fields of process manufacturing, 3D printing and the like. In recent years, with the improvement of the manufacturing process of double-clad optical fibers and the power of a high-brightness semiconductor laser, the output power of single-path high-power optical fiber laser is rapidly developed, and the output power is improved from 100W at the beginning of 21 st century to 20 kilowatts at present. Since the optical efficiency of the high-power ytterbium-doped fiber laser is generally 65% -85%, a 1000-watt fiber laser has 150-350 watt of heat inside the doped fiber.
The us Lorents-Li Fuma laboratory researchers Dawson et al state that when heat builds up to a certain extent inside the doped fiber, the doped fiber will melt the core (see Dawson J W,Messerly M J,Beach R J,et al.Analysis of the scalability of diffraction-limited fiber lasers and amplifiers to high average power[J].Opt.Express.2008,16:13240-13266.).. Besides the quantum defect of the doped fiber, the heat inside the undoped energy-transfer fiber (hereinafter referred to as energy-transfer fiber) will accumulate to burn out the fiber due to mode mismatch, and the rapid accumulation of heat at the melting point (including the melting point between the doped fiber and the doped fiber, between the doped fiber and the energy-transfer fiber, and between the energy-transfer fiber) will also cause fiber burnout due to fusion loss.
Currently, there are two main types of methods for solving the problem of high power fiber laser refrigeration. The gain optical fiber is placed in a refrigerating device with a specific design, heat of the gain optical fiber is conducted to a cooling device through heat conduction and then is conducted away by a liquid cooling loop in the cooling device, and the cooling method can only conduct direct contact and conduction cooling on part of the surface of the optical fiber, so that the cooling efficiency is not very high; the other is that the gain fiber is directly soaked in water, and in the method, hydroxyl ions in the water are directly contacted with the gain fiber, so that the loss of the fiber is increased along with the increase of time, and the output power and the stability of the laser are affected. In addition, in the two refrigeration methods, only the refrigeration of the gain optical fiber is emphasized, and the refrigeration of other high-power devices such as an optical fiber grating, a cladding light filter, a beam combiner and the like is not more involved, or only single-sided conduction cooling is realized; in fact, in lasers, with the exception of the gain fiber, the fusion point between the individual fiber devices and the fiber may heat up and affect the stability of the laser.
Disclosure of Invention
One of the objects of the present invention is to provide a fiber laser cooling device based on flowing low boiling point liquid, which can realize multi-directional cooling of each heating side surface of a fiber laser device.
Another object of the present invention is to provide a method for cooling a fiber laser based on a flowing low boiling point liquid.
In order to achieve one of the above purposes, the present invention is implemented by the following technical scheme:
a fiber laser cooling device based on flowing low boiling point liquid, which comprises a bottom plate 1 and a cover plate 2;
The upper surface of the bottom plate 1 is provided with a groove 1-2 for placing an optical fiber laser device covered by pouring sealant 1-8 and low boiling point liquid 1-9; the side surface of the bottom plate 1 is provided with a low boiling point liquid inlet 5 and a low boiling point liquid outlet 6; the low boiling point liquid inlet 5 and the low boiling point liquid outlet 6 are communicated with the grooves 1-2; the side edge of the bottom plate 1 is provided with optical fiber input/output preformed holes 1-10;
The cover plate 2 is in sealing connection with the groove 1-2.
Further, a sealing space for cooling water to flow is formed at the bottom of the bottom plate 1; the bottom plate 1 is provided with a bottom plate cooling water inlet 3 and a bottom plate cooling water outlet 4;
The floor cooling water inlet 3 and the floor cooling water outlet 4 communicate with the sealed space.
Further, the sealing space is a serpentine flow channel or an annular flow channel.
Further, the difference between the depth of the groove 1-2 and the highest device height in the fiber laser device is 3-15 mm;
the thickness of the pouring sealant 1-8 is 0.01-1 mm.
Further, the boiling point of the low boiling point liquid 1-9 is lower than the minimum of the maximum temperatures permitted for operation of the fiber laser device.
Further, the position of the low boiling point liquid inlet 5 is higher than the position corresponding to the highest device in the fiber laser devices;
the position of the low boiling point liquid outlet 6 is lower than the position corresponding to the lowest plane inside the recess 1-2.
Further, the low boiling point liquid inlet 5 and the low boiling point liquid outlet 6 are both quick connectors.
Further, the bottom plate cooling water inlet 3 and the bottom plate cooling water outlet 4 are both water-cooled joints.
In order to achieve the second purpose, the invention adopts the following technical scheme:
The fiber laser cooling method based on the flowing low-boiling point liquid adopts the fiber laser cooling device for cooling, and comprises the following steps:
Placing the fiber laser device in a groove 1-2 in a bottom plate 1, and then performing fiber fusion welding; the input optical fiber of the optical fiber laser device after optical fiber welding extends out of the reserved optical fiber hole sites 1-10 and then is welded with the output optical fiber of the pump source, and the output optical fiber of the optical fiber laser device after optical fiber welding extends out of the reserved optical fiber hole sites 1-10 and then is welded with the input optical fiber of the optical fiber end cap; coating the optical fiber fusion joint;
pouring sealant 1-8 is adopted to perform pouring and curing on the fiber laser device and the coated fiber fusion point;
Sealing the reserved optical fiber hole sites 1-10; and injecting a low boiling point liquid 1-9 from a low boiling point liquid inlet 5 into the groove 1-2 until the fiber laser device to be cooled and the fiber fusion splice are completely covered;
Covering a cover plate 2 on the bottom plate 1; and completely sealing the groove 1-2;
cooling water is injected into the sealed space from the bottom plate cooling water inlet 3 and flows, and then flows out from the bottom plate cooling water outlet 4;
injecting the low boiling point liquid 1-9 into the low boiling point liquid inlet 5, allowing it to flow in the grooves 1-2, and then flowing out from the low boiling point liquid outlet 6;
the fiber laser is started.
The invention has the beneficial effects that:
1. According to the invention, the cooling water flows in the sealed space on the bottom plate to cool the bottom surface of the optical fiber laser device to be cooled covered by the pouring sealant in the groove in the bottom plate in a heat conduction way, and the low boiling point liquid flowing in the groove in the bottom plate cools other side surfaces of the optical fiber laser device to be cooled covered by the pouring sealant in the groove, so that the other side surfaces of the bottom surface of the optical fiber laser device can be simultaneously and effectively cooled in multiple directions; and the temperature of the contact surface with the low-boiling-point liquid can be controlled within a constant temperature value of the boiling point of the liquid by utilizing the evaporation refrigeration and the flow heat conduction of the low-boiling-point liquid.
2. The multi-directional refrigerating device can rapidly take away heat generated by the optical fiber laser device through multi-directional refrigerating of the optical fiber laser device, can greatly reduce possible damage of each device of the optical fiber laser device caused by thermal load, and greatly improves the stability of the high-power optical fiber laser device.
Drawings
FIG. 1 is a schematic diagram of a fiber laser cooling device based on flowing low boiling point liquid according to the present invention;
FIG. 2 is a schematic view of a base plate structure according to the present invention;
FIG. 3 is a schematic diagram of a cover plate according to the present invention;
fig. 4 is an exploded view of a fiber laser cooling device based on flowing low boiling point liquid according to the present invention.
Detailed Description
The following detailed description of specific embodiments of the invention refers to the accompanying drawings.
The embodiment provides a fiber laser cooling device based on flowing low-boiling point liquid, which comprises a bottom plate 1 and a cover plate 2. Referring to fig. 1,2 and 4, the structure of the bottom plate 1 is that the upper surface of the bottom plate 1 is provided with a groove 1-2, the groove 1-2 is used for placing and fixing all devices of the optical fiber laser, and other optical fiber devices of the optical fiber resonator and the amplifier except the pump source, such as a high-reflection optical fiber grating 1-3, a low-reflection optical fiber grating 1-4, a pump beam combiner 1-5, a gain optical fiber 1-6, a cladding light filter 1-7 and the like, and the devices to be cooled are encapsulated by using a pouring sealant 1-8, so that all surfaces to be cooled are ensured to be covered by the pouring sealant. All the devices are connected in turn by an optical fiber fusion mode according to the principle of an optical fiber laser resonator or an amplifier, and fusion points are coated and protected by using a standard process. The side surface of the bottom plate 1 is provided with a low boiling point liquid inlet 5 and a low boiling point liquid outlet 6; the low boiling point liquid inlet 5 and the low boiling point liquid outlet 6 communicate with the grooves 1-2. The low boiling point liquid 1-9 injected into the groove 1-2 from the low boiling point liquid inlet 5 covers the optical fiber laser device, and the waste low boiling point liquid can be discharged from the low boiling point liquid outlet 6. And heat generated by the fiber laser device and conducted to the surface of the heat conducting glue is taken away together by boiling heat absorption and flow heat conduction when the laser works.
In this embodiment, the groove 1-2 in the bottom plate 1 is obtained by cutting down a certain depth along the upper surface of the bottom plate 1, and the depth of the groove 1-2 is 3-15mm higher than the highest device height in the fiber laser device, so that the upper surface of the device is ensured not to be in direct contact with the lower surface of the cover plate 2 after the device is placed in the groove.
In order to carry away the heat generated by the fiber laser device and conducted to the base plate 1, the base plate 1-1 of the present embodiment is also provided with a sealed space. The soleplate 1 is provided with a soleplate cooling water inlet 3 and a soleplate cooling water outlet 4, and the soleplate cooling water inlet 3 and the soleplate cooling water outlet 4 are communicated with a sealed space (not shown in the figure). The sealed space is filled with flowing cooling water, which is injected into the sealed space from the bottom plate cooling water inlet 3 and then flows out from the bottom plate cooling water outlet 4. The side edge of the bottom plate 1 is provided with an optical fiber input/output preformed hole 1-10, the optical fiber input/output preformed hole 1-10 is used for extending the optical fiber of the pump beam combiner 1-5 or the output optical fiber of the laser, welding the optical fiber with the output optical fiber of the pump source or the input optical fiber of the optical fiber end cap, and sealing the optical fiber input/output preformed hole 1-10 by using sealant after the optical fiber is welded or placed so as to ensure that the internal liquid and the boiled gas are not leaked.
The cover plate 2 of the embodiment covers the upper surface of the bottom plate 1, the groove 1-2 inside the bottom plate 1 is completely fixed and sealed through the screw 2-1, and the structure of the cover plate 2 is shown in fig. 3. When the fiber laser works, flowing low-boiling point liquid in the groove 1-2 in the bottom plate 1 absorbs heat through flowing heat conduction or boiling, and takes away heat generated by the fiber laser device and conducted to the surface of the heat conduction glue. Wherein, the boiling low boiling point liquid rises in boiling, is condensed after meeting the cover plate 2, and the condensed liquid flows into the groove 1-2 to realize recycling.
The sealed space in this embodiment is a flow channel for cooling water to flow, and may be a serpentine flow channel or an annular flow channel. The pouring sealant 1-8 generally adopts heat-conducting glue, has higher heat conductivity coefficient, mobility before solidification and can seal all devices waiting for cooling of the gain optical fiber, the optical fiber melting point and the optical fiber grating after solidification. In order to achieve both heat conductivity and isolation, the thickness of the pouring sealant of the embodiment is controlled to be 0.01-1 mm, so that the heat conductivity coefficient of the optical fiber laser device and the bottom plate 1 can be improved, the optical fiber and the optical fiber laser device can be prevented from being directly contacted with low-boiling point liquid, and the optical fiber laser device is protected.
In this embodiment, the bottom plate cooling water inlet 3 and the bottom plate cooling water outlet 4 are both water-cooled joints. The position of the low boiling point liquid inlet 5 is higher than the position corresponding to the highest device in the fiber laser devices; the position of the low boiling point liquid outlet 6 is lower than the position corresponding to the lowest plane inside the recess 1-2. The low boiling point liquid inlet 5 and the low boiling point liquid outlet 6 are both quick connectors.
The boiling point of the low boiling point liquids 1-9 in this embodiment is below the minimum of the highest temperatures permitted for stable operation of the fiber laser device. For example, the maximum allowable temperature of the gain optical fiber is 80 ℃, the maximum allowable temperature of the optical fiber beam is 70 ℃, the maximum allowable temperature of the optical fiber beam combiner is 50 ℃, and the boiling point of the low boiling point liquid is at least lower than 50 ℃, so that when the working temperature of all devices does not reach the allowable maximum temperature, the heat of the devices can be taken away through the boiling of the low boiling point liquid, and the temperature of the liquid can be ensured to be constant at the boiling point temperature due to the fact that the boiling is a constant temperature phase change physical process, and the temperature of the devices can be ensured not to be increased.
According to the embodiment, the grooves in the bottom plate, the fiber laser device to be cooled covered by the pouring sealant in the grooves, flowing low-boiling point liquid in the grooves and cooling water in a sealed space at the bottom of the bottom plate are used for simultaneously and effectively refrigerating other heating surfaces of the fiber laser device in multiple directions; meanwhile, the temperature of the contact surface with the low-boiling-point liquid can be controlled within a constant temperature value of the boiling point of the liquid by utilizing the flowing heat conduction and the evaporation refrigeration of the low-boiling-point liquid; according to the multi-azimuth refrigerating device, heat generated by the optical fiber laser device can be rapidly taken away, possible damage of each device of the optical fiber laser due to heat load can be greatly reduced, and stability of the high-power optical fiber laser is greatly improved.
Another embodiment provides a fiber laser cooling method based on flowing low boiling point liquid, which is characterized in that the fiber laser cooling method adopts the fiber laser cooling device described in the above embodiment for cooling, and includes the following steps:
Step one, placing an optical fiber laser device in a groove 1-2 in a bottom plate 1 and then performing optical fiber fusion welding; the input and output optical fibers of the optical fiber laser device after optical fiber fusion welding extend out of the reserved optical fiber hole sites 1-10 and then are fused with a pumping source and an optical fiber end cap; coating the optical fiber fusion joint;
Step two, pouring and curing the fiber laser device and the coated fiber welding point by adopting pouring sealant 1-8;
thirdly, sealing the reserved optical fiber hole sites 1-10; and injecting a low boiling point liquid 1-9 from a low boiling point liquid inlet 5 into the groove 1-2 until the fiber laser device to be cooled and the fiber fusion splice are completely covered;
step four, covering a cover plate water cooling plate 2 on the bottom plate 1; and completely sealing the groove 1-2;
injecting cooling water into the sealed space from the bottom plate cooling water inlet 3, flowing the cooling water, and flowing the cooling water out from the cooling water outlet 4;
step six, injecting the low boiling point liquid 1-9 into the groove 1-2 from the low boiling point liquid inlet 5, flowing in a flowing mode, and flowing out from the low boiling point liquid outlet 6;
and step seven, starting the fiber laser.
In this embodiment, all the optical fiber devices 1-3 to 1-7 placed in the grooves 1-2 are cooled by the cooling water in the sealed space of the bottom 1-1 of the bottom plate 1 and the low boiling point liquid flowing in the grooves 1-2.
It should be noted that, in the fiber laser cooling method of the present embodiment, the order of the implementation steps is changeable, such as the order of the step five and the step six is interchangeable.
It will be evident to those skilled in the art that the embodiments of the invention are not limited to the details of the foregoing illustrative embodiments, and that the embodiments of the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are, therefore, to be considered in all respects as illustrative and not restrictive, the scope of embodiments being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned. Furthermore, it is evident that the word "comprising" does not exclude other elements or steps, and that the singular does not exclude a plurality. A plurality of units, modules or means recited in a system, means or terminal claim may also be implemented by means of software or hardware by means of one and the same unit, module or means. The terms first, second, etc. are used to denote a name, but not any particular order.
Finally, it should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the embodiment of the present invention, and not for limiting, and although the embodiment of the present invention has been described in detail with reference to the above-mentioned preferred embodiments, it should be understood by those skilled in the art that modifications and equivalent substitutions can be made to the technical solution of the embodiment of the present invention without departing from the spirit and scope of the technical solution of the embodiment of the present invention.
Claims (9)
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| CN201911005430.1A CN110829157B (en) | 2019-10-22 | 2019-10-22 | Fiber laser cooling device and method based on flowing low-boiling-point liquid |
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| CN111668683A (en) * | 2020-05-31 | 2020-09-15 | 华南理工大学 | A case for housing nonlinear polarization rotation mode-locked fiber lasers |
| CN111900599A (en) * | 2020-06-19 | 2020-11-06 | 广芯微电子（广州）股份有限公司 | Q-switched pulse fiber laser seed source equipment |
| CN111668686A (en) * | 2020-07-07 | 2020-09-15 | 中国人民解放军国防科技大学 | A modular fiber laser cooling device |
| CN112987182B (en) * | 2021-04-25 | 2021-08-31 | 中国工程物理研究院激光聚变研究中心 | Optical fiber combiner and optical fiber laser |
| CN118336509A (en) * | 2024-06-13 | 2024-07-12 | 度亘核芯光电技术(苏州)有限公司 | Cooling device of semiconductor laser |
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