CN210640478U - Optical fiber laser cooling device based on flowing low-boiling-point liquid - Google Patents
Optical fiber laser cooling device based on flowing low-boiling-point liquid Download PDFInfo
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- CN210640478U CN210640478U CN201921775183.9U CN201921775183U CN210640478U CN 210640478 U CN210640478 U CN 210640478U CN 201921775183 U CN201921775183 U CN 201921775183U CN 210640478 U CN210640478 U CN 210640478U
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Abstract
The utility model discloses an optical 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 fiber laser device covered by the pouring sealant and the low-boiling-point liquid; a low boiling point liquid inlet and a low boiling point liquid outlet are arranged on the side surface of the bottom plate; 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 mode. The utility model discloses can realize that fiber laser device each generates heat the diversified cooling of side.
Description
Technical Field
The utility model belongs to the technical field of the fiber laser, a optic fibre laser cooling device based on low boiling liquid flows is related to.
Background
The high-power optical fiber laser has wide application in the fields of process manufacturing, 3D printing and the like. In recent years, with the manufacturing process of double-clad optical fibers and the power improvement of high-brightness semiconductor lasers, the output power of single-path high-power optical fiber lasers is rapidly developed, and the output power is improved from 100 watts at the beginning of the 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 watts of heat inside the doped fiber.
Lorentz-Rifammol laboratory researchers in the United states, Dawson et al, have shown that core melting occurs in doped fibers when heat builds up to some extent within the doped fiber (see Dawson J W, Messerly M J, Beach R J, et al. analysis of the symmetry of the diffraction-limited fiber lasers and modulators to high amplitude power [ J ]. Opt. express.2008,16: 13240-. In addition to the quantum defect of the doped fiber, the internal heat of the undoped energy-transfer fiber (hereinafter referred to as energy-transfer fiber) can be accumulated to burn out the fiber due to the power leakage caused by the mode mismatch; the rapid accumulation of heat at the melting point (including the melting point between doped and energy-transmitting fibers, and between energy-transmitting and energy-transmitting fibers) can also lead to fiber burnout due to fusion loss resulting in laser leakage. Therefore, the thermal effect inside the fiber is a limiting factor that hinders the fiber laser power boost. In order to increase the fiber laser output power, effective measures must be taken to cool the fiber laser.
Currently, there are two main types of methods for solving the problem of cooling of high-power fiber lasers. One is that the gain fiber is placed in a specially designed refrigerating device, the heat of the gain fiber is conducted to a cooling device through heat conduction, and then the heat is conducted away by a liquid cooling loop in the cooling device, the cooling method can only carry out direct contact and conduction cooling on partial surface of the fiber, and the cooling efficiency is not very high; the other is that the gain optical fiber is completely and directly soaked in water, in the method, as hydroxide ions in water directly contact with the gain optical fiber, the loss of the optical fiber is increased along with the increase of time, and the output power and the stability of the laser are influenced. In addition, in the two refrigeration methods, the refrigeration of the gain fiber is mostly emphasized, and for the refrigeration of other high-power devices such as fiber gratings, cladding light filters, beam combiners and the like, little refrigeration is involved, or only single-side conduction cooling is adopted; in fact, the laser may generate heat and affect the stability of the laser at the fusion joints between the respective fiber devices and the optical fiber, except for the gain fiber.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an optic fibre laser cooling device based on flowing low boiling liquid, the device can realize the diversified cooling of the side that generates heat of fiber laser device each.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a fiber laser cooling device based on flowing low boiling point liquid 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 a fiber laser device covered by a pouring sealant 1-8 and a 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 groove 1-2; the side edge of the bottom plate 1 is provided with optical fiber input and output preformed holes 1-10;
the cover plate 2 is connected with the groove 1-2 in a sealing mode.
Further, a sealed space for cooling water to flow is arranged at the bottom of the bottom plate 1; a bottom plate cooling water inlet 3 and a bottom plate cooling water outlet 4 are formed in the bottom plate 1;
the bottom plate cooling water inlet 3 and the bottom plate cooling water outlet 4 are communicated with the sealed space.
Further, the sealing space is a snake-shaped flow passage or an annular flow passage.
Further, the difference between the depth of the groove 1-2 and the height of the highest device 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 value of the highest temperature allowed by the operation of the optical 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 device;
the position of the low boiling point liquid outlet 6 is lower than the position corresponding to the lowest plane in the groove 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-cooling joints.
The utility model has the advantages that:
1. the utility model discloses a bottom surface heat conduction cooling of the fiber laser device that treats cooling that flows cooling water in the confined space on the bottom plate and is covered by the casting glue in the recess of bottom plate inside, cool off other each side of the fiber laser device that treats cooling that is covered by the casting glue in the recess through the low boiling point liquid that flows in the recess of bottom plate inside, thereby realize carrying on effectively multidirectional refrigeration simultaneously to other each side of fiber laser device bottom surface; and the temperature of the contact surface of the liquid with the low boiling point can be controlled within the constant temperature value of the boiling point of the liquid by utilizing the evaporation refrigeration and the flowing heat conduction of the liquid with the low boiling point.
2. The utility model discloses a to the diversified refrigeration of fiber laser device, can take away the heat that fiber laser device produced fast, each device that can greatly reduce fiber laser because of the possible damage that the heat load leads to has greatly improved high power fiber laser's stability.
Drawings
Fig. 1 is a schematic structural view of an optical fiber laser cooling device based on flowing low boiling point liquid according to the present invention;
fig. 2 is a schematic view of the bottom plate structure of the present invention;
FIG. 3 is a schematic view of the cover plate structure of the present invention;
fig. 4 is an explosion diagram of the optical fiber laser cooling device based on flowing low boiling point liquid in the present invention.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference 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. The structure of the bottom plate 1 refers to fig. 1, 2 and 4, 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 fiber laser, other fiber devices of the fiber resonator and the amplifier except for the pumping source, such as high-reflection fiber gratings 1-3, low-reflection fiber gratings 1-4, pumping beam combiners 1-5, gain fibers 1-6, cladding light filters 1-7 and the like, and the devices to be cooled are encapsulated by using encapsulation glue 1-8, so that all surfaces to be cooled are all covered by the encapsulation glue. All devices are connected in sequence through an optical fiber welding mode according to the principle of an optical fiber laser resonator or an amplifier, and coating protection is carried out on welding points 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; a low boiling point liquid inlet 5 and a low boiling point liquid outlet 6 are communicated with the groove 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 fiber laser device, and the waste low boiling point liquid can be discharged from the low boiling point liquid outlet 6. When the laser works, the heat generated by the fiber laser device and transferred to the surface of the heat-conducting glue is taken away through boiling heat absorption and flowing heat conduction together.
In this embodiment, the groove 1-2 in the bottom plate 1 is obtained by cutting a certain depth downwards along the upper surface of the bottom plate 1, and the depth of the groove 1-2 is 3-15 mm higher than the height of the highest device in the fiber laser device, so as to ensure that the upper surface of the device does not directly contact with the lower surface of the cover plate 2 after the device is placed in the groove.
The bottom 1-1 of the backplane 1 of the present embodiment is also provided with a sealed space in order to take away the heat generated by the fiber laser device and conducted to the backplane 1. The base plate 1 is provided with a base plate cooling water inlet 3 and a base plate cooling water outlet 4, and the base plate cooling water inlet 3 and the base plate cooling water outlet 4 are communicated with a sealed space (not shown in the figure). Flowing cooling water is introduced into the sealed space, and the cooling water is injected into the sealed space from the bottom plate cooling water inlet 3 and flows out from the bottom plate cooling water outlet 4. The side edge of the bottom plate 1 is provided with optical fiber input and output preformed holes 1-10, the optical fiber input and output preformed holes 1-10 are used for enabling the optical fibers of the pumping beam combiner 1-5 or the output optical fibers of the laser to extend out and to be welded with the output optical fibers of a pumping source or the input optical fibers of an optical fiber end cap, and after the optical fibers are welded or placed, the optical fiber input and output preformed holes 1-10 are sealed by sealant so as to ensure that liquid inside and gas after boiling cannot leak outside.
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 by the screw 2-1, and the structure of the cover plate 2 refers to fig. 3. When the optical 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 the low-boiling-point liquid carries heat generated by an optical fiber laser device and conducted to the surface of the heat-conducting glue. Wherein, the boiling low boiling point liquid rises, and is condensed after meeting the cover plate 2, and the condensed liquid flows into the groove 1-2 part to realize the cyclic utilization.
The sealed space in this embodiment is a flow channel through which cooling water flows, and may be a serpentine flow channel or an annular flow channel. The pouring sealant 1-8 is generally made of heat-conducting glue, has high heat conductivity coefficient and fluidity before curing, and can completely seal devices such as gain optical fibers, optical fiber melting points and optical fiber gratings to be cooled after curing. In order to take account of heat conductivity and isolation, the thickness of the potting adhesive 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, direct contact between the optical fiber and the optical fiber laser device and low-boiling-point liquid can be avoided, 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 device; the low boiling point liquid outlet 6 is located lower than the lowest plane inside the groove 1-2. The low boiling point liquid inlet 5 and the low boiling point liquid outlet 6 are quick connectors.
The boiling points of the low boiling point liquids 1 to 9 in this embodiment are lower than the minimum of the maximum temperatures allowed 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 by boiling the low-boiling-point liquid, and because the boiling is a phase-change physical process with constant temperature, the temperature of the liquid can be ensured to be constant at the boiling point temperature, and the temperature of the devices can be ensured to be constant at the temperature value and not to be increased.
In the embodiment, the grooves in the bottom plate, the optical fiber laser device to be cooled covered by the pouring sealant in the grooves, the flowing low-boiling-point liquid in the grooves and the cooling water in the sealed space at the bottom of the bottom plate are used for simultaneously and effectively refrigerating other heating surfaces of the optical fiber laser device in multiple directions; meanwhile, the temperature of the contact surface of 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 evaporative refrigeration of the low-boiling-point liquid; the embodiment can rapidly take away the heat generated by the fiber laser device through multi-directional refrigeration of the fiber laser device, can greatly reduce the possible damage of each device of the fiber laser due to heat load, and greatly improves the stability of the high-power fiber laser.
The optical fiber laser cooling method of the embodiment is specifically implemented as follows:
firstly, placing an optical fiber laser device in a groove 1-2 in a bottom plate 1 and then performing optical fiber fusion; the input and output optical fibers of the optical fiber laser device after optical fiber fusion welding are extended out of the reserved optical fiber hole positions 1-10 and then are fused with the pumping source and the optical fiber end cap; coating the optical fiber fusion points;
step two, potting and curing the fiber laser device and the coated optical fiber fusion point by adopting 1-8 parts of potting adhesive;
step three, sealing the reserved optical fiber hole sites 1-10; injecting low-boiling-point liquid 1-9 into the groove 1-2 from a low-boiling-point liquid inlet 5 until the fiber laser device to be cooled and the fiber fusion point are completely covered;
step four, covering the cover plate water-cooling plate 2 on the bottom plate 1; and completely seals the groove 1-2;
step five, 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;
injecting low-boiling-point liquid 1-9 into the groove 1-2 from a low-boiling-point liquid inlet 5, flowing and flowing, and flowing out from a low-boiling-point liquid outlet 6;
and step seven, starting the optical fiber laser.
In the embodiment, all optical fiber devices 1-3-1-7 placed in the groove 1-2 are cooled by cooling water in the sealed space at the bottom 1-1 of the bottom plate 1 and low-boiling-point liquid flowing in the groove 1-2.
It should be noted that, in the fiber laser cooling method of the present embodiment, the order of implementing the steps may be changed, for example, the order of the step five and the step six may be interchanged.
It is apparent to those skilled in the art that the embodiments of the present invention are not limited to the details of the above-described exemplary embodiments, and can 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 the 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 obvious that the word "comprising" does not exclude other elements or steps, and the singular does not exclude the plural. Several units, modules or means recited in the system, apparatus or terminal claims may also be implemented by one and the same unit, module or means in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention and are not limited, and although the embodiments of the present invention have been described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that modifications and equivalent substitutions can be made on the technical solutions of the embodiments of the present invention without departing from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A fiber laser cooling device based on flowing low boiling point liquid, which is characterized by comprising 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 a fiber laser device covered by the pouring sealant (1-8) and a low-boiling-point liquid (1-9); a low boiling point liquid inlet (5) and a low boiling point liquid outlet (6) are arranged on the side surface of the bottom plate (1); the low-boiling-point liquid inlet (5) and the low-boiling-point liquid outlet (6) are communicated with the groove (1-2); the side edge of the bottom plate (1) is provided with an optical fiber input/output preformed hole (1-10);
the cover plate (2) is connected with the grooves (1-2) in a sealing mode.
2. The fiber laser cooling device according to claim 1, wherein a bottom of the base plate (1) is provided with a sealed space in which cooling water flows; a bottom plate cooling water inlet (3) and a bottom plate cooling water outlet (4) are formed in the bottom plate (1);
and the bottom plate cooling water inlet (3) and the bottom plate cooling water outlet (4) are communicated with the sealed space.
3. The fiber laser cooling device of claim 2, wherein the sealed space is a serpentine flow channel or an annular flow channel.
4. The fiber laser cooling device according to any one of claims 1 to 3, wherein the difference between the depth of the groove (1-2) and the highest device height in the fiber laser device is 3 to 15 mm;
the thickness of the pouring sealant (1-8) is 0.01-1 mm.
5. The fiber laser cooling device according to any one of claims 1 to 3, wherein the boiling point of the low boiling point liquid (1-9) is lower than the minimum value of the maximum temperature allowed for the operation of the fiber laser device.
6. The fiber laser cooling device according to any one of claims 1 to 3, wherein the low boiling point liquid inlet (5) is located higher than the highest device in the fiber laser device;
the position of the low boiling point liquid outlet (6) is lower than the position corresponding to the lowest plane in the groove (1-2).
7. The optical fiber laser cooling device according to any one of claims 1 to 3, wherein the low boiling point liquid inlet (5) and the low boiling point liquid outlet (6) are quick connectors.
8. The fiber laser cooling device according to claim 2 or 3, wherein the base plate cooling water inlet (3) and the base plate cooling water outlet (4) are both water-cooled joints.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110829157A (en) * | 2019-10-22 | 2020-02-21 | 中国人民解放军国防科技大学 | Optical fiber laser cooling device and method based on flowing low-boiling-point liquid |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110829157A (en) * | 2019-10-22 | 2020-02-21 | 中国人民解放军国防科技大学 | Optical fiber laser cooling device and method based on flowing low-boiling-point liquid |
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