CN115663574A - Laser crystal heat sink of disk laser - Google Patents
Laser crystal heat sink of disk laser Download PDFInfo
- Publication number
- CN115663574A CN115663574A CN202211436255.3A CN202211436255A CN115663574A CN 115663574 A CN115663574 A CN 115663574A CN 202211436255 A CN202211436255 A CN 202211436255A CN 115663574 A CN115663574 A CN 115663574A
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- Prior art keywords
- heat sink
- laser
- crystal
- metal
- laser crystal
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- 239000013078 crystal Substances 0.000 title claims abstract description 100
- 229910052751 metal Inorganic materials 0.000 claims abstract description 48
- 239000002184 metal Substances 0.000 claims abstract description 48
- 239000010432 diamond Substances 0.000 claims abstract description 44
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 44
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 33
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000001816 cooling Methods 0.000 claims abstract description 16
- 229910052755 nonmetal Inorganic materials 0.000 claims abstract description 9
- 229910052738 indium Inorganic materials 0.000 claims description 11
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 claims description 11
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 239000011651 chromium Substances 0.000 claims description 5
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 5
- 239000010931 gold Substances 0.000 claims description 5
- 229910052737 gold Inorganic materials 0.000 claims description 5
- 239000000463 material Substances 0.000 description 13
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 10
- 229910052802 copper Inorganic materials 0.000 description 10
- 239000010949 copper Substances 0.000 description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 239000007769 metal material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000017525 heat dissipation Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 229910001338 liquidmetal Inorganic materials 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000008646 thermal stress Effects 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000007888 film coating Substances 0.000 description 2
- 238000009501 film coating Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 241000784732 Lycaena phlaeas Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
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- Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)
Abstract
The invention particularly relates to a laser crystal heat sink of a disc laser. The invention comprises a laser crystal of a disc laser, a non-metal heat sink, a crystal high-reflection film and a high-thermal conductivity metal; the lower surface of the laser crystal of the disc laser is connected with a nonmetal heat sink through a metal with high thermal conductivity, and the crystal high-reflection film is plated on the lower surface of the laser crystal of the disc laser and is positioned between the laser crystal of the disc laser and the metal with high thermal conductivity; the nonmetal heat sink is a diamond heat sink or a silicon carbide heat sink. The invention also comprises a laser crystal heat sink with another structure, which comprises a disc laser crystal, a diamond radiating fin, a silicon carbide heat sink and a high-thermal-conductivity metal; the lower surface of the laser crystal of the disc laser is connected with the upper surface of the diamond cooling fin through a metal with high thermal conductivity, and the lower surface of the diamond cooling fin is connected with the silicon carbide through a metal with high thermal conductivity in a heat sink manner; the lower surface of the laser crystal of the disc laser is plated with a crystal high-reflection film.
Description
Technical Field
The invention relates to a laser crystal heat sink, in particular to a laser crystal heat sink of a disc laser.
Background
Since the emergence of laser, many domestic and foreign research institutions carry out continuous and deep research on laser technology, wherein a solid laser has important application in both pulse output and continuous output directions by virtue of the characteristics of high output power, high beam quality and the like. With the appearance of the disc laser, the development of the solid laser is further promoted one step, and compared with the traditional rod-shaped solid laser, the disc laser has the unique advantages that the disc laser has obvious advantages, the radial thermal gradient of the laser crystal can be ignored due to the large diameter-thickness ratio of the laser crystal, only the axial one-dimensional thermal gradient exists, the heat dissipation efficiency of the crystal in the whole working process is greatly improved, the thermal lens effect is effectively relieved, the electro-optic conversion efficiency is improved, and the light emitting brightness is improved.
An important factor limiting further power increases in high power disc lasers is the waste heat management of the laser crystal. The disc laser instrument is when high power big energy output, and along with output's promotion, crystal axial temperature difference can constantly increase, and the final crystal physical damage that results in by thermal stress that takes place is the very high-efficient and ripe mode at present through heat sink with the inside used heat derivation of crystal fast. Therefore, under the condition of higher output power of the disk laser, the requirement of the laser crystal on the heat sink is higher and higher.
The materials of the traditional heat sink are usually copper, red copper and the like, and the common heat sink design methods comprise a copper heat sink and a diamond heat dissipation plate combined copper heat sink, but the method faces several aspects of problems. Firstly, the thermal conductivity of copper materials is relatively low, and due to the pursuit of people for higher power output of lasers, the generation of waste heat in laser crystals is higher and higher, and the metal materials such as copper and the like serving as heat sinks cannot meet the higher and higher heat dissipation requirements of the laser crystals. On the other hand, the copper material has low hardness, and for the softer crystals with a YLF Mohs hardness of about 5, a high-hardness material is needed to support the crystals and weaken the deformation of the crystals. Finally, the thermal expansion coefficient of metal materials such as copper is large, and the thermal stress deformation of the heat sink can cause large influence on the laser crystal in the heat conduction process.
Disclosure of Invention
The invention provides a laser crystal heat sink of a disc laser, aiming at solving the problems of low heat exchange efficiency and low material hardness of the laser crystal heat sink of the existing disc laser and large thermal stress deformation caused by large thermal expansion coefficient of the existing material.
Compared with metal materials, diamond and silicon carbide have many advantages, wherein three points of higher thermal conductivity, higher hardness and lower thermal expansion coefficient are the most critical. Taking the most common copper heat sink as an example, the thermal conductivity of copper is about 400W/(m.K), the Mohs hardness is 3, and the thermal expansion coefficient is 18 multiplied by 10 -6 about/K; the diamond material has a thermal conductivity of 1800-2000W/(m.K), a Mohs hardness of 10, and a thermal expansion coefficient of 1 x 10 -6 about/K; the silicon carbide material has a thermal conductivity of 490W/(m.K), a Mohs hardness of 9.5, and a thermal expansion coefficient of 4.5X 10 -6 And about/K. It can be seen that the diamond and the silicon carbide material have more excellent values of thermal conductivity, hardness and thermal expansion coefficient, wherein the parameters of the diamond are more excellent, so that the selection of the full diamond or the silicon carbide material for manufacturing the heat sink is a good choice.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the laser crystal heat sink of the first disk laser comprises a disk laser crystal, and is characterized in that: the solar cell further comprises a nonmetal heat sink, a crystal high-reflection film and a high-thermal-conductivity metal;
the non-metal heat sink is connected with the lower surface of the laser crystal of the disc laser through a metal with high heat conductivity, and the crystal high-reflection film is plated on the lower surface of the laser crystal of the disc laser and is positioned between the laser crystal of the disc laser and the metal with high heat conductivity;
the reflection wavelength range of the crystal high-reflection film covers the wavelengths of the pump light and the signal light corresponding to the laser crystal of the disc laser;
the nonmetal heat sink is a diamond heat sink or a silicon carbide heat sink; the diamond heatsink or the silicon carbide heatsink is fixed in an external cooling system.
Further, the high thermal conductivity metal is indium metal.
Further, the lower surface of the crystal high-reflection film is plated with a metal film, and the metal film comprises a gold film and a chromium film which are sequentially arranged from top to bottom.
Further, the heat sink clamp is further included, and the diamond heat sink or the silicon carbide heat sink is fixed in the external cooling system through the heat sink clamp.
The laser crystal heat sink of the second disk laser comprises a disk laser crystal, and is characterized in that: the heat sink also comprises a diamond heat sink, a silicon carbide heat sink and a metal with high thermal conductivity;
the upper surface of the diamond cooling fin is connected with the lower surface of the laser crystal of the disc laser through a high-thermal-conductivity metal, and the lower surface of the diamond cooling fin is connected with the silicon carbide through a high-thermal-conductivity metal in a heat sink mode;
the lower surface of the laser crystal of the disc laser is plated with a crystal high-reflection film.
Further, the high thermal conductivity metal is indium metal.
Further, the lower surface of the crystal high-reflectivity film is plated with a metal film, and the metal film comprises a gold film and a chromium film which are sequentially arranged from top to bottom.
Further, the heat sink fixture is further included, and the diamond heat radiating fins and the silicon carbide heat sink are both located in the heat sink fixture.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, by utilizing the high thermal conductivity of diamond and silicon carbide materials in the non-metallic materials, the heat exchange efficiency between the laser crystal and the heat sink is effectively improved, the internal waste heat deriving speed of the crystal is improved, the influence of the thermal effect on the crystal is reduced, and the beam quality of the output laser is improved.
2. The invention utilizes the high hardness of the diamond and the silicon carbide material to reduce the deformation of the crystal caused by the heat effect in the working process and improve the beam quality of the output laser.
3. The invention utilizes the stable physicochemical properties of diamond and silicon carbide materials, and can select various cooling working media such as: water, liquid metal, liquid nitrogen, etc. without fear of heat sink damage.
Drawings
Fig. 1 is a schematic diagram of a heat sink structure of a laser crystal of a disk laser according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a heat sink structure of a laser crystal of a disk laser in the second embodiment of the present invention.
Wherein the reference numerals are as follows:
1. a disc laser crystal; 2. a heat sink fixture; 3. a crystalline high-reflection film; 4. a metal film; 5. indium metal; 6. heat sinking of diamond; 7. a diamond heat sink; 8. and a silicon carbide heat sink.
Detailed Description
The invention is further explained with reference to the drawings and the detailed description.
Example one
As shown in FIG. 1, the invention provides a laser crystal heat sink of a disc laser, which comprises a disc laser crystal 1, a heat sink clamp 2, a crystal high-reflection film 3, a metal film 4, indium metal 5 and a diamond heat sink 6. The lower surface of the laser crystal 1 of the disc laser is sequentially provided with a crystal high-reflection film 3 and a metal film 4, wherein the reflection wavelength range of the crystal high-reflection film 3 covers the wavelengths of pump light and signal light corresponding to the laser crystal 1 of the disc laser and is used for reflecting laser, and the metal film 4 comprises a chromium film and a gold film which are sequentially overlapped from top to bottom. The lower surface of the laser crystal 1 of the disc laser after film coating is welded and connected with the diamond heat sink 6 through the indium metal 5 with high heat conductivity, the diamond heat sink 6 can also be replaced by a silicon carbide heat sink, and the metal film 4 ensures that the indium metal 5 and the laser crystal 1 of the disc laser are welded stably, so that no gap exists between the two.
The diamond heat sink 6 is placed in the heat sink clamp 2 and fixed in a cooling system through the heat sink clamp 2, and cooling working mediums in the cooling system include but are not limited to: water, liquid metal or liquid nitrogen, etc.
When the laser is applied, pump light and signal light are adjusted to be incident into the laser crystal 1, then are reflected by a high-reflection film at the bottom of the crystal, and are emitted out through the laser crystal 1. The heat is generated by the irradiation of the pump light and the signal light, the heat is rapidly led out by the diamond (or silicon carbide) heat sink 6, the cooling working medium flows to the diamond (or silicon carbide) heat sink 6 from the bottom to carry out heat exchange, the heat of the diamond heat sink 6 is absorbed, and the heat dissipation of the laser crystal 1 is realized.
Example two
As shown in fig. 2, the invention further provides a laser crystal heat sink of a disk laser, which comprises a disk laser crystal 1, a diamond heat sink 7, a silicon carbide heat sink 8, a crystal high-reflection film 3, a metal film 4 and indium metal 5. The lower surface of the laser crystal 1 of the disc laser is sequentially provided with a crystal high-reflection film 3 and a metal film 4, the lower surface of the laser crystal 1 of the disc laser after film coating is connected with a diamond radiating fin 7 through welding of indium metal 5 with high heat conductivity, and the lower surface of the diamond radiating fin 7 is connected with a silicon carbide heat sink 8 through welding of the indium metal 5.
The diamond heat radiating fins 7 and the silicon carbide heat sink 8 are both positioned in the heat sink clamp 2 and are fixed in a cooling system through the heat sink clamp 2, and cooling working media in the cooling system include but are not limited to: water, liquid metal or liquid nitrogen, etc.
When the laser is applied, pump light and signal light are adjusted to be incident into the laser crystal 1, then are reflected by a high-reflection film at the bottom of the crystal, and are emitted out through the laser crystal 1. The heat is produced by pump light and signal light irradiation, and the heat is derived by diamond fin 6 fast, and further the heat is from diamond fin 6 to silicon carbide heat sink 8 transmission, and cooling medium flows to silicon carbide heat sink 8 from the bottom and carries out the heat exchange, absorbs silicon carbide heat sink 8's heat, realizes that laser crystal 1 dispels the heat.
The other technical features and the embodiment are the same.
For the above laser, the formula of heat conduction is as follows:
Q＝ΔT·γ·S/L
wherein Q is heat, Δ T is temperature difference, γ is thermal conductivity, S is area, and L is thickness.
From the above formula, under the unchangeable condition of thickness, area and difference in temperature, the promotion of thermal conductivity directly reflects on the heat of unit interval heat conduction, and diamond and carborundum compare in the metal material of copper, and the thermal conductivity has obvious promotion, and heat conductivility is also more outstanding promptly.
Claims (8)
1. The utility model provides a laser crystal of disc laser is heat sink, includes disc laser crystal (1), its characterized in that: the solar cell further comprises a non-metal heat sink, a crystal high-reflection film (3) and a high-thermal-conductivity metal;
the nonmetal heat sink is connected with the lower surface of the disc laser crystal (1) through a high-heat-conductivity metal, and the crystal high-reflection film (3) is plated on the lower surface of the disc laser crystal (1) and is positioned between the disc laser crystal (1) and the high-heat-conductivity metal;
the reflection wavelength range of the crystal high-reflection film (3) covers the wavelengths of the pump light and the signal light corresponding to the laser crystal (1) of the disc laser;
the nonmetal heat sink is a diamond heat sink (6) or a silicon carbide heat sink (8); the diamond heat sink (6) or the silicon carbide heat sink (8) is fixed in an external cooling system.
2. The laser crystal heat sink of the disc laser as claimed in claim 1, wherein: the high thermal conductivity metal is indium metal (5).
3. The laser crystal heat sink of the disc laser as claimed in claim 2, wherein: the lower surface of the crystal high-reflection film (3) is plated with a metal film (4), and the metal film (4) comprises a gold film and a chromium film which are sequentially arranged from top to bottom.
4. A laser crystal heat sink for a disc laser as claimed in any one of claims 1 to 3, wherein: the heat sink fixture (2) is further included, and the diamond heat sink (6) or the silicon carbide heat sink (8) is fixed in an external cooling system through the heat sink fixture (2).
5. The utility model provides a laser crystal of disc laser is heat sink, includes disc laser crystal (1), its characterized in that: the heat sink also comprises a diamond heat sink (7), a silicon carbide heat sink (8) and high-thermal-conductivity metal;
the upper surface of the diamond radiating fin (7) is connected with the lower surface of the laser crystal (1) of the disc laser through a high-heat-conductivity metal, and the lower surface of the diamond radiating fin (7) is connected with a silicon carbide heat sink (8) through a high-heat-conductivity metal;
the lower surface of the laser crystal (1) of the disc laser is plated with a crystal high-reflection film (3).
6. The laser crystal heat sink of the disc laser as claimed in claim 5, wherein: the high-thermal-conductivity metal is indium metal (5).
7. The laser crystal heat sink of the disc laser as claimed in claim 6, wherein: the lower surface of the crystal high-reflection film (3) is further plated with a metal film (4), and the metal film (4) comprises a gold film and a chromium film which are sequentially arranged from top to bottom.
8. A laser crystal heat sink for a disc laser as claimed in any one of claims 5 to 7, wherein: the diamond heat sink is characterized by further comprising a heat sink clamp (2), wherein the diamond heat radiating fins (7) and the silicon carbide heat sink (8) are both located in the heat sink clamp (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211436255.3A CN115663574A (en) | 2022-11-16 | 2022-11-16 | Laser crystal heat sink of disk laser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211436255.3A CN115663574A (en) | 2022-11-16 | 2022-11-16 | Laser crystal heat sink of disk laser |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115663574A true CN115663574A (en) | 2023-01-31 |
Family
ID=85019349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211436255.3A Pending CN115663574A (en) | 2022-11-16 | 2022-11-16 | Laser crystal heat sink of disk laser |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115663574A (en) |
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2022
- 2022-11-16 CN CN202211436255.3A patent/CN115663574A/en active Pending
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