CN115173196A - Optical fiber laser heat sink and optical fiber laser device - Google Patents
Optical fiber laser heat sink and optical fiber laser device Download PDFInfo
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- CN115173196A CN115173196A CN202210901794.3A CN202210901794A CN115173196A CN 115173196 A CN115173196 A CN 115173196A CN 202210901794 A CN202210901794 A CN 202210901794A CN 115173196 A CN115173196 A CN 115173196A
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- 239000000835 fiber Substances 0.000 claims abstract description 109
- 239000002826 coolant Substances 0.000 claims abstract description 91
- 230000001629 suppression Effects 0.000 claims abstract description 28
- 230000000694 effects Effects 0.000 abstract description 37
- 238000001816 cooling Methods 0.000 abstract description 8
- 230000002829 reductive effect Effects 0.000 abstract description 3
- 230000005764 inhibitory process Effects 0.000 abstract 2
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- 230000006355 external stress Effects 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 description 2
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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
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/042—Arrangements for thermal management for solid state lasers
-
- 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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- 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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
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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
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10013—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by controlling the temperature of the active medium
-
- 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
- H01S2301/00—Functional characteristics
- H01S2301/03—Suppression of nonlinear conversion, e.g. specific design to suppress for example stimulated brillouin scattering [SBS], mainly in optical fibres in combination with multimode pumping
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- Optics & Photonics (AREA)
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Abstract
The invention provides a fiber laser heat sink and a fiber laser device, belonging to the technical field of laser, wherein the fiber laser heat sink comprises a first heat sink body, and the first heat sink body comprises a first inhibition structure and/or a second inhibition structure; the first suppression structure includes at least two first cooling medium channels disposed on the first heat sink body; the temperatures of at least two first cooling medium channels in all the first cooling S medium channels are different; the second suppression structure comprises a concave curved surface structure arranged on the first heat sink body, and the concave curved surface structure is located at the coiling position of the active optical fiber of the optical fiber laser. The structure of the first heat sink body is improved, so that the improved first heat sink body can simultaneously relieve the heat effect and inhibit the SBS effect, and the complexity of the structure is reduced.
Description
Technical Field
The invention relates to the technical field of laser, in particular to a fiber laser heat sink and a fiber laser device.
Background
The high-power single-frequency fiber laser with narrow line width has the coherence length of hundreds of kilometers, so that the high-power single-frequency fiber laser has wide application prospect in the aspects of ultrahigh precision and ultra-long distance detection. At present, a seed source main oscillation Power-Amplifier (MOPA) is a common device for obtaining high-Power single-frequency laser output. During amplification, the high-power induced thermal effect and Stimulated Brillouin Scattering (SBS) effect are two main factors limiting the power boost of single-frequency laser.
In the prior art, for the aspect of relieving the heat effect, an active optical fiber is usually coiled on a heat sink for cooling; in the aspect of suppressing the SBS effect, the Brillouin gain spectrum is broadened by adopting the SBS effect suppression device, so that the SBS threshold is increased to suppress SBS, and high-power single-frequency laser output is realized; for simultaneously relieving the heat effect and inhibiting the SBS effect, the active optical fiber is coiled on the heat sink for cooling, the SBS effect inhibiting device is adopted for widening the Brillouin gain spectrum, and the SBS threshold is improved for inhibiting the SBS effect.
However, in the above prior art, in order to simultaneously alleviate the thermal effect and suppress the SBS effect, two components, i.e., a heat sink and a SBS effect suppression device, are required, resulting in a complicated structure.
Disclosure of Invention
The invention provides a fiber laser heat sink and a fiber laser device, which are used for overcoming the defect that the structure for simultaneously relieving the heat effect and inhibiting the SBS effect is complex in the prior art.
The invention provides a fiber laser heat sink and a fiber laser device, comprising: a first heat sink body comprising a first suppression structure and/or a second suppression structure;
the first suppression structure includes at least two first cooling medium channels disposed on the first heat sink body; the temperatures of at least two of all the first cooling medium channels are different;
the second suppression structure comprises a concave curved surface structure arranged on the first heat sink body, and the concave curved surface structure is located at the coiling position of the active optical fiber of the optical fiber laser.
According to the fiber laser heat sink provided by the invention, the first cooling medium channel is arranged at the coiling position of the active fiber on the first heat sink body.
According to the fiber laser heat sink provided by the invention, the first cooling medium channel is arranged at a position except the coiling position of the active optical fiber on the first heat sink body.
According to the fiber laser heat sink provided by the invention, the first heat sink body comprises a cylindrical structure;
the channel direction of the first cooling medium channel is parallel to the axial direction of the first heat sink body.
According to the fiber laser heat sink provided by the invention, the cylindrical structure comprises a first side surface and a second side surface, and the first side surface is of the concave curved surface structure.
According to the fiber laser heat sink provided by the invention, the cylindrical structure comprises a first side surface and a second side surface, and the first side surface and the second side surface are both in the concave curved surface structure.
The fiber laser heat sink further comprises a second heat sink body connected with the first heat sink body;
the second heat sink body is used for fixing a connection point of an active fiber and a passive fiber of the fiber laser.
According to the fiber laser heat sink provided by the invention, the second heat sink body comprises a flat plate type structure.
According to the fiber laser heat sink provided by the invention, the second heat sink body is provided with a countersunk hole.
The invention also provides a fiber laser device, which comprises a fiber laser and the fiber laser heat sink, wherein the fiber laser comprises an active fiber;
the optical fiber laser heat sink is arranged in the optical fiber laser, and the active optical fiber is coiled on the first heat sink body of the optical fiber laser heat sink.
According to the optical fiber laser heat sink and the optical fiber laser device, the first suppression structure and/or the second suppression structure are/is designed on the first heat sink body, the first suppression structure comprises at least two first cooling medium channels, and temperature gradient fields are formed through different temperatures of the first cooling medium channels; the second suppression structure is an inwards concave surface structure which is arranged on the first heat sink body and is positioned at the coiling position of the active optical fiber of the optical fiber laser, and a stress field is introduced based on the inwards concave surface structure, so that the threshold value of the stimulated Brillouin scattering is improved through a temperature gradient field and/or the stress field. It can be seen that the structure of the first heat sink body is improved, so that the improved first heat sink body can simultaneously relieve the thermal effect and inhibit the SBS effect, thereby reducing the complexity of the structure.
Drawings
In order to more clearly illustrate the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of a fiber laser heat sink according to the present invention;
FIG. 2 is a second schematic diagram of the structure of the fiber laser heat sink provided by the present invention;
FIG. 3 is a third schematic structural diagram of a fiber laser heat sink according to the present invention;
FIG. 4 is a fourth schematic diagram of the structure of the fiber laser heat sink provided by the present invention;
FIG. 5 is a fifth schematic view of the structure of the fiber laser heat sink provided by the present invention;
fig. 6 is a schematic structural diagram of a fiber laser heat sink provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The structure of the heat sink of the fiber laser of the present invention is described below with reference to fig. 1 to 6.
Fig. 1 is a schematic structural diagram of a fiber laser heat sink provided by the present invention, fig. 2 is a second schematic structural diagram of the fiber laser heat sink provided by the present invention, and fig. 3 is a third schematic structural diagram of the fiber laser heat sink provided by the present invention, as shown in fig. 1 to fig. 3, the fiber laser heat sink includes a first heat sink body 101, and the first heat sink body 101 includes a first suppression structure 102 and/or a second suppression structure 103.
The first suppression structure 102 includes at least two first cooling medium channels disposed on the first heat sink body 101; at least two of the first cooling medium passages are different in temperature.
The second suppression structure 103 includes a concave curved surface structure provided on the first heat sink body 101, where the concave curved surface structure is located at a winding position of an active fiber of the fiber laser.
The first heat sink body 101 can relieve the thermal effect, and the structure of the first heat sink body 101 is designed, so that the SBS effect is inhibited on the basis of relieving the thermal effect. The SBS effect can be inhibited, the Brillouin gain spectrum can be broadened through the temperature field or the stress gradient field, and the SBS threshold is further improved.
Illustratively, the structural design of the first heat sink body 101 includes the following three ways:
first, as shown in fig. 1, a first suppression structure 102 is designed on a first heat sink body 101, and the first suppression structure 102 includes at least two first cooling medium channels disposed on the first heat sink body 101; at least two of all the first cooling medium channels are different in temperature, and a temperature gradient field is formed by the difference in temperature of the first cooling medium channels, and three first cooling medium channels are shown in fig. 1.
The second way, as shown in fig. 2, the second suppression structure 103 is designed on the first heat sink body 101, the second suppression structure 103 includes an inward concave surface structure disposed on the first heat sink body 101, the inward concave surface structure is located at the coiling position of the active fiber of the fiber laser, the inward concave surface structure of the first heat sink body 101 can realize different coiling sizes for the active fiber of the fiber laser, the coiling size is smaller, the larger the introduced stress is, the different coiling sizes of the active fiber of the fiber laser at different positions on the first heat sink body 101 are different, and the introduction of a gradual change stress field (stress gradient field) is realized.
A third way, as shown in fig. 3, is to combine the above two ways, that is, to design the first and second suppression structures 102 and 103 on the first heat sink body 101 at the same time.
It should be noted that when the first heat sink body 101 simultaneously designs the first suppression structure 102 and the second suppression structure 103, the SBS effect is most effective.
The temperature of the first cooling medium passage may be different from each other, and the temperature of the cooling medium in the first cooling medium passage may be different from each other.
According to the fiber laser heat sink provided by the invention, a first inhibiting structure 102 and/or a second inhibiting structure 103 are/is designed on a first heat sink body 101, the first inhibiting structure 102 comprises at least two first cooling medium channels, and a temperature gradient field is formed by different temperatures of the first cooling medium channels; the second suppression structure 103 is an inwardly concave surface structure which is arranged on the first heat sink body 101 and is located at the coiling position of the active optical fiber of the optical fiber laser, and introduces a stress field based on the inwardly concave surface structure, so that the threshold of stimulated brillouin scattering is improved through a temperature gradient field and/or the stress field, thereby effectively suppressing the SBS effect and further realizing the output of high-power single-frequency laser. It can be seen that the present invention improves the structure of the first heat sink body 101, so that the first heat sink body 101 after being improved can simultaneously alleviate the thermal effect and suppress the SBS effect, thereby reducing the complexity of the structure.
Optionally, the first cooling medium channel is arranged where the active optical fiber is coiled on the first heat sink body 101.
For example, the first cooling medium channel may be positioned where the first heatsink body 101 is coiled around the active fiber, i.e., the inlet and outlet of the first cooling medium channel are open to the face of the first heatsink body 101 that is coiled around the active fiber.
Preferably, the first cooling medium channel may also be disposed at a position other than the position where the active optical fiber is coiled on the first heatsink body, and then the channel direction of the first cooling medium channel is parallel to the arrangement direction of the active optical fiber on the first heatsink body 101.
The active optical fiber is wound on the first heat sink body 101, the winding direction of the active optical fiber is a spiral direction, a circumference of the active optical fiber wound along the spiral direction is a winding unit, and the arrangement direction of the active optical fiber on the first heat sink body 101 is the arrangement direction of the winding unit on the first heat sink body 101.
For example, if the first heat sink body 101 is a cylindrical structure, and the active optical fibers are spirally wound on the circumferential side of the first heat sink body 101, the arrangement direction of the active optical fibers on the first heat sink body 101 is the center line direction of the first heat sink body 101, and the channel direction of the first cooling medium channel is parallel to the arrangement direction of the active optical fibers on the first heat sink body 101.
According to the fiber laser heat sink provided by the invention, the channel direction of the first cooling medium channel is designed to be parallel to the arrangement direction of the active fibers on the first heat sink body 101, so that a temperature gradient field formed by the first cooling medium channel has a better SBS (styrene-butadiene-styrene) effect inhibiting effect.
Optionally, the first heat sink body 101 comprises a cylindrical structure; the channel direction of the first cooling medium channel is parallel to the center line of the first heat sink body 101.
In the existing single-frequency fiber laser amplification system, a cylindrical heat sink or a flat plate heat sink is usually used, and although the problem of thermal effect can be alleviated, it is difficult to simultaneously apply a stress field to inhibit the SBS effect. In addition, currently, a cylindrical heat sink or a flat plate heat sink using a water cooling structure is a single temperature setting. The first heat sink body 101 of the invention adopts a cylindrical structure, and the first heat sink body 101 is provided with a plurality of first cooling medium channels, and the SBS effect is inhibited by forming a temperature gradient field through the difference of the temperatures of the plurality of first cooling medium channels.
Illustratively, as shown in fig. 1, the first heat sink body 101 includes an upper bottom surface, a lower bottom surface, and a side surface disposed between the upper bottom surface and the lower bottom surface, the channel direction of the first cooling medium channel is parallel to the center line of the first heat sink body 101, then the first cooling medium channel is a through hole that penetrates from the upper bottom surface of the first heat sink body 101 to the lower bottom surface of the first heat sink body 101, and the center line of the first cooling medium channel is parallel to the center line of the first heat sink body 101. The first cooling medium channels on the first heat sink body 101 are shown in fig. 1 as three arranged side by side.
It should be noted that there are a plurality of first cooling medium channels on the first heat sink body 101, and the temperature difference of the first cooling medium channels may be different among all the first cooling medium channels on the first heat sink body 101, or there may be first cooling medium channels with the same temperature among all the first cooling medium channels, or there may also be first cooling medium channels with different temperatures. The number and temperature of the first cooling medium channels on the first heat sink body 101 can be flexibly selected and designed depending on the desired distribution of the temperature field.
According to the optical fiber laser heat sink provided by the invention, the first heat sink body 101 is designed into a cylindrical structure, the channel direction of the first cooling medium channel is parallel to the central line of the first heat sink body 101, a temperature gradient field can be formed through the plurality of first cooling medium channels which are arranged on the first heat sink body 101 in parallel, and on the basis of effectively relieving the heat effect, the threshold value of stimulated Brillouin scattering is effectively improved through the temperature gradient field introduced by the plurality of first cooling medium channels, so that the SBS effect is effectively inhibited; and the temperature field distribution can be simply and flexibly controlled by designing the temperature of the first cooling medium channel.
Optionally, the cylindrical structure includes a first side surface and a second side surface, and the first side surface is the concave curved surface structure.
Among them, in the prior art, the structure for suppressing the SBS effect by applying the stress field is complicated. The side surface of the first heat sink body 101 is designed into the concave curved surface structure, and the stress field is introduced through the concave curved surface structure to inhibit the SBS effect, so that the structure is simpler.
Illustratively, the side surfaces of the first heat sink body 101 of the cylindrical structure include a first side surface and a second side surface, and the first side surface may be designed to have a concave curved surface structure.
Further, fig. 4 is a fourth schematic structural diagram of the optical fiber laser heat sink provided by the present invention, as shown in fig. 4, the first side surface and the second side surface can both be concave curved surface structures, and the middle portion of the side surface of the first heat sink body 101 with a cylindrical structure is integrally concave, so that the diameter of the first heat sink body 101 is sequentially increased from the middle portion to the two ends, and the cross section of the first heat sink body 101 is a hyperbolic structure.
It should be noted that the diameter of the first heat sink body 101 having the concave curved surface structure is different from the bottom surface to the top surface, and different winding diameters can be implemented at different positions of the active optical fiber. The smaller the coiling diameter of the active optical fiber is, the larger the stress is introduced, so that the introduction of a gradual stress field is realized by adjusting the coiling diameters of different positions of the active optical fiber. Wherein, the coiling diameters of different positions of the active optical fiber are adjusted, that is, the size of the concave curved surface structure is adjusted, so as to realize the change of the diameter of the first heat sink body 101.
It should be noted that, unlike the conventional cylindrical heat sink, the first heat sink body 101 of the present invention has a side surface designed to be a concave curved surface structure, and the first heat sink body 101 has a gradually changing diameter, so that the coiling diameters of the active optical fiber at different positions are different, and a gradually changing stress field is introduced.
It should be noted that, in the prior art, the structure that inhibits the SBS effect through the external stress field is difficult to realize the gradual stress field distribution, and the difficulty of applying the external stress field and the temperature field is high, and the cost is high. The invention can realize the introduction of the gradual change type stress field only through the diameter change of the first heat sink body 101, and the adjustment mode is simple.
According to the optical fiber laser heat sink provided by the invention, the side surface of the first heat sink body 101 is integrally of the concave curved surface structure, so that a stress field formed by the concave curved surface structure has a better SBS (styrene butadiene styrene) effect inhibiting effect.
In addition, according to the optical fiber laser heat sink provided by the invention, the first cooling medium channel is designed on the first heat sink body 101, and the side surface of the first heat sink body 101 is integrally of the concave curved surface structure, so that a stress field and a temperature field can be simultaneously applied, the implementation mode is simple, and the cost is low.
Optionally, fig. 5 is a fifth schematic structural diagram of the optical fiber laser heat sink provided by the present invention, and as shown in fig. 5, the optical fiber laser heat sink further includes a second heat sink body 201 connected to the first heat sink body 101; the second heat sink body 201 is used for fixing a connection point of an active fiber and a passive fiber of the fiber laser.
The optical fiber laser comprises an active optical fiber and a passive optical fiber, wherein the active optical fiber is coiled on a first heat sink body 101, the active optical fiber and the passive optical fiber need to be connected and fixed, concretely, the active optical fiber and the passive optical fiber adopt a welding mode, if a welding point of the active optical fiber and the passive optical fiber is placed on the first heat sink body 101 and is fixed on the side surface of the first heat sink body 101, the welding point can be bent due to the fact that the side surface of the first heat sink body 101 is an arc surface, the welding point can be bent, heat accumulation can be caused due to the bending of the welding point, damage can be caused to the welding point, and the service life of the optical fiber laser is shortened. Therefore, the fiber laser heat sink of the present invention further includes a second heat sink body 201 connected to the first heat sink body 101, and the connection point of the active fiber and the passive fiber of the fiber laser is fixed by the second heat sink body 201.
Preferably, the second heat sink body 201 includes a flat plate structure, and the welding points of the active optical fiber and the passive optical fiber are placed on the second heat sink body 201, and since the second heat sink body 201 has a flat plate structure, the welding sections (the welding sections formed by a plurality of welding points) of the active optical fiber and the passive optical fiber can be arranged in a straight line.
When the second heat sink body 201 is connected to the first heat sink body 101, the second heat sink body 201 is provided with second cooling medium channels, which are equal in number to the first cooling medium channels and respectively correspond to the first cooling medium channels.
It should be noted that the second heat sink body 201 and the first heat sink body 101 may be an integral structure.
According to the optical fiber laser heat sink provided by the invention, the welding point of the active optical fiber and the passive optical fiber is placed on the second heat sink body 201, the welding section of the active optical fiber and the passive optical fiber can be arranged to be linear, the effective protection of the welding point is realized, the heat accumulation caused by the bending of the welding point is effectively relieved, the problem that the welding point is damaged under high power is avoided, and the service life of the optical fiber laser is prolonged.
Further, a countersunk hole 202 is formed in the second heat sink body 201.
Illustratively, the fiber laser heat sink needs to be fixed in the fiber laser, and a countersunk hole 202 is formed on the second heat sink body 201, and a screw penetrates through the countersunk hole 202 to be connected with the fiber laser, so as to fix the fiber laser heat sink on the fiber laser.
According to the optical fiber laser heat sink provided by the invention, the second heat sink body 201 is provided with the countersunk hole 202, so that the fixation of the optical fiber laser heat sink is facilitated; in addition, the screw penetrates through the countersunk hole 202 to be connected with the fiber laser, so that the heat sink of the fiber laser can be fixed on the fiber laser, and a distance exists between the heat sink of the fiber laser and the fiber laser, thereby facilitating the communication between the external cooling equipment and the second cooling medium channel on the second heat sink body 201, and realizing the circulating flow of the cooling medium in the first cooling medium channel and the second cooling medium channel.
Fig. 6 is a schematic structural diagram of a fiber laser heat sink provided in an embodiment of the present invention, and as shown in fig. 6, the fiber laser heat sink includes a first heat sink body 101 and a second heat sink body 201 which are integrally structured, and in this embodiment, both the first heat sink body 101 and the second heat sink body 201 are made of aluminum.
The first heat sink body 101 is a cylindrical structure, and the side surface of the first heat sink body 101 is a concave curved surface structure, so that the cross section of the first heat sink body 101 is hyperbolic; the middle of the upper bottom surface of the first heat sink body 101 is provided with 9 first cooling medium channels penetrating to the lower bottom surface, the center lines of the 9 first cooling medium channels are parallel to the center line of the first heat sink body 101, and the 9 first cooling medium channels are in a matrix of 3 rows and 3 columns.
The second heat sink body 201 is a flat plate structure, countersunk holes 202 are formed in four corners of the second heat sink body 201, the second heat sink body 201 is provided with second cooling medium channels corresponding to the 9 first cooling medium channels, and the middle of the second heat sink body 201 is also provided with 9 second cooling medium channels which are communicated and arranged in a 3-row and 3-column matrix.
Illustratively, four screws are respectively placed in the four countersunk holes 202 and connected with the fiber laser, so that the heat sink module is fixed in the fiber laser; placing a fusion point of an active fiber and a passive fiber of a fiber laser on a second heat sink body 201, fixing the fusion point, then coiling the active fiber from the bottom of a first heat sink body 101 to the top (coiling the active fiber from one end of the first heat sink body 101 close to the second heat sink body 201 to one end of the first heat sink body 101 far away from the second heat sink body 201), and fixing the active fiber on the first heat sink body 101 by using a copper adhesive tape in a coiling process so that the active fiber is directly contacted with the outer wall of the first heat sink body 101 to dissipate heat, wherein the coiling diameter of the active fiber gradually changes from the bottom to the top (from one end of the first heat sink body 101 close to the second heat sink body 201 to one end of the first heat sink body 101 far away from the second heat sink body 201), specifically, the coiling diameter of the active fiber in the embodiment is firstly reduced and then increased from the bottom to the top; in other embodiments, the coil diameters at different locations of the active fiber may be set according to the desired stress field.
The first row of the 9 first cooling medium channels is respectively a first cooling medium channel, a second cooling medium channel and a third cooling medium channel, the second row is respectively a fourth cooling medium channel, a fifth cooling medium channel and a sixth cooling medium channel, and the third row is respectively a seventh cooling medium channel, an eighth cooling medium channel and a ninth cooling medium channel;
in this embodiment, the first cooling medium channel, the fourth cooling medium channel, and the seventh cooling medium channel are fed with the circulating cooling liquid with the temperature of 10 ℃, the second cooling medium channel, the fifth cooling medium channel, and the eighth cooling medium channel are fed with the circulating cooling liquid with the temperature of 8 ℃, and the third cooling medium channel, the sixth cooling medium channel, and the ninth cooling medium channel are fed with the circulating cooling liquid with the temperature of 6 ℃, so that the first heat sink body 101 forms a temperature gradient field with the temperature gradually decreasing from the left to the right in fig. 6.
It should be noted that the first cooling medium channels on the first heat sink body 101 may also be distributed in a circular shape or a triangular shape, and the like, and the temperature of the first cooling medium channels on the first heat sink body 101 may be arranged in an arrangement manner that the temperature is first decreased and then increased, or in an arrangement manner that the temperature is first increased and then decreased along a target direction. The temperature of the first cooling medium channel and the cooling liquid on the first heat sink body 101 are reasonably designed according to the distribution of the required temperature field.
It should be noted that, the injection of the cooling liquids with different temperatures in different first cooling medium channels enables the first heat sink body 101 to form a temperature gradient field, and the independent cooling medium channels can implement a programmed water cooling structure to implement different required temperature fields.
According to the fiber laser heat sink provided by the invention, 9 independent first cooling medium channels which are communicated from the top (upper bottom surface) to the bottom (lower bottom surface) are arranged in the first heat sink body 101, refrigeration at different temperatures is carried out by selecting different first cooling medium channels, a programmable water cooling structure is realized, and a programmable temperature gradient field is formed; coiling the active optical fiber from the bottom to the top of the first heat sink body 101 to form a gradient stress field; on the basis of effectively relieving the heat effect, the stress field and the temperature field are simultaneously introduced to improve the threshold value of the stimulated Brillouin scattering, so that the output of high-power single-frequency laser is realized.
The optical fiber laser provided by the invention is heat-sunk, the introduction of a gradient stress field and a programmable temperature gradient field is realized, the threshold value of stimulated Brillouin scattering can be improved, the cost and the complexity are effectively reduced, and the working stability of the laser is ensured.
Further, as shown in fig. 6, the cross section of the first heat sink body 101 is hyperbolic, and for active optical fibers with different core diameters, the minimum diameter of the middle part of the first heat sink body 101 may be set to be slightly larger than the minimum diameter required for coiling the active optical fiber, so as to avoid the increase of loss caused by too small curvature. In addition, the maximum diameter of the bottom of the first heat sink body 101 (the end connected to the second heat sink body 201) may be set to 200mm. Because the diameters of the first heat sink body 101 from the bottom to the top are different, different coiling diameters can be realized at different positions of the active optical fiber, the smaller the coiling diameter of the active optical fiber is, the larger the introduced stress is, and therefore, the introduction of the gradual change type stress field can be realized by adjusting the coiling diameters of the active optical fiber at different positions.
In this embodiment, the concave curved surface structure of the first heat sink body 101 may be a vertically symmetrical structure, and the upper portion and the lower portion of the first heat sink body 101 are designed symmetrically. In another embodiment, the upper and lower portions of the first heat sink body 101 may also be of asymmetric design.
The invention also provides a fiber laser device, comprising a fiber laser and the fiber laser heat sink provided by any one of the above embodiments, wherein the fiber laser comprises an active fiber; the optical fiber laser heat sink is arranged in the optical fiber laser, and the active optical fiber is coiled on the first heat sink body 101 of the optical fiber laser heat sink.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one position, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A fiber laser heat sink, comprising: a first heat sink body comprising a first suppression structure and/or a second suppression structure;
the first suppression structure includes at least two first cooling medium channels disposed on the first heat sink body; the temperatures of at least two of all the first cooling medium channels are different;
the second suppression structure comprises a concave curved surface structure arranged on the first heat sink body, and the concave curved surface structure is located at the coiling position of the active optical fiber of the optical fiber laser.
2. The fiber laser heat sink of claim 1 wherein the first cooling medium channel is disposed where the active fiber is coiled on the first heat sink body.
3. The fiber laser heat sink of claim 1 wherein the first cooling medium channel is disposed at a location other than where the active fiber is coiled on the first heat sink body.
4. The fiber laser heat sink of claim 3, wherein the first heat sink body comprises a cylindrical structure;
the channel direction of the first cooling medium channel is parallel to the axial direction of the first heat sink body.
5. The fiber laser heat sink of claim 4, wherein the cylindrical structure includes a first side and a second side, the first side having the concave curved surface structure.
6. The fiber laser heat sink of claim 4, wherein the cylindrical structure includes a first side and a second side, both of the first side and the second side being in the concave curved surface configuration.
7. The fiber laser heat sink of any of claims 1 to 6, further comprising a second heat sink body connected to the first heat sink body;
the second heat sink body is used for fixing a connection point of an active fiber and a passive fiber of the fiber laser.
8. The fiber laser heat sink of claim 7, wherein the second heat sink body comprises a flat plate structure.
9. The fiber laser heat sink of claim 7, wherein the second heat sink body is provided with a counter-bore.
10. A fiber laser apparatus comprising a fiber laser, further comprising a fiber laser heat sink according to any of claims 1 to 9, the fiber laser comprising an active fiber;
the optical fiber laser heat sink is arranged in the optical fiber laser, and the active optical fiber is coiled on the first heat sink body of the optical fiber laser heat sink.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210901794.3A CN115173196A (en) | 2022-07-28 | 2022-07-28 | Optical fiber laser heat sink and optical fiber laser device |
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| CN202210901794.3A CN115173196A (en) | 2022-07-28 | 2022-07-28 | Optical fiber laser heat sink and optical fiber laser device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115395359A (en) * | 2022-10-28 | 2022-11-25 | 中国航天三江集团有限公司 | Method and device for inhibiting SBS (styrene-butadiene-styrene) effect of optical fiber |
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2022
- 2022-07-28 CN CN202210901794.3A patent/CN115173196A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115395359A (en) * | 2022-10-28 | 2022-11-25 | 中国航天三江集团有限公司 | Method and device for inhibiting SBS (styrene-butadiene-styrene) effect of optical fiber |
| CN115395359B (en) * | 2022-10-28 | 2023-03-10 | 中国航天三江集团有限公司 | Method and device for inhibiting optical fiber SBS (styrene butadiene styrene) effect |
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