CN107046219B - Cooling system and cooling method for chirped Bragg grating - Google Patents
Cooling system and cooling method for chirped Bragg grating Download PDFInfo
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- CN107046219B CN107046219B CN201710253310.8A CN201710253310A CN107046219B CN 107046219 B CN107046219 B CN 107046219B CN 201710253310 A CN201710253310 A CN 201710253310A CN 107046219 B CN107046219 B CN 107046219B
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- chirped
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- 238000001816 cooling Methods 0.000 title claims abstract description 104
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000000498 cooling water Substances 0.000 claims description 15
- 238000007789 sealing Methods 0.000 claims description 13
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- H01S5/00—Semiconductor lasers
- H01S5/02—Structural details or components not essential to laser action
- H01S5/024—Arrangements for thermal management
- H01S5/02407—Active cooling, e.g. the laser temperature is controlled by a thermo-electric cooler or water cooling
- H01S5/02423—Liquid cooling, e.g. a liquid cools a mount of the laser
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Lasers (AREA)
Abstract
The application relates to a chirped Bragg grating cooling system and a cooling method, belonging to the technical field of optical element temperature control, wherein the cooling system comprises a cooling main board, 2 guide plates and a cover plate, wherein the 2 guide plates and the cover plate are positioned in a cavity, the cavity for accommodating the chirped Bragg grating is arranged in the cooling main board, the 2 guide plates divide the cavity into a first cavity, a cooling cavity and a second cavity in sequence, guide slits are arranged on the guide plates along the length direction of the chirped Bragg grating, and water filling ports and water outlets are arranged on the cooling main board.
Description
Technical Field
The application belongs to the technical field of temperature control of optical elements, and particularly relates to a chirped Bragg grating cooling system and a cooling method.
Background
The chirped volume Bragg grating is a reflective volume Bragg grating with the grating period gradually changing along the beam propagation direction, and the characteristic enables different wavelengths to be reflected on different planes inscribed in the grating, so that the broadening and compression of high-power ultrafast laser pulses (ps/fs) can be carried out. Since the period of the grating is gradually changed in the direction in which the beam propagates, the laser pulse will be stretched in time when light is incident from one direction; when light propagates in the opposite direction, the laser pulses will be compressed in time.
The chirped Bragg grating is of a cuboid structure, two end faces are light-passing faces, light enters from one end face, and then is reflected and output from the end face. When a high-power laser beam is transmitted in the chirped volume Bragg grating, the material absorbs light to a certain extent, so that heat is generated, and the temperature of the volume Bragg grating is also increased due to scattering, diffraction and the like of the material. However, the use performance of the chirped bragg grating is seriously affected by an excessively high temperature, and thus the chirped bragg grating needs to be subjected to heat dissipation and cooling.
The existing cooling technology generally adopts two modes of natural heat dissipation cooling and active cooling, and the active cooling mainly adopts an air knife to sweep and cool the side face of the air knife at present, so that the cooling efficiency is lower. For high power, especially laser power above hundred watts, the existing cooling mode is difficult to meet the temperature control requirement of the chirped Bragg grating, so that the quality of the light beam is seriously affected.
Disclosure of Invention
In order to solve the above-mentioned problems, the inventors have now proposed a highly efficient and compact chirped bragg grating cooling system and cooling method, which are effective in cooling, based on the structural characteristics of the chirped bragg grating.
In order to achieve the above purpose, the present application provides the following technical solutions:
a chirped volume bragg grating cooling system comprising:
the cooling main board is provided with an opening at the top, a cavity for accommodating the chirped Bragg grating is arranged in the cooling main board, and two ends of the chirped Bragg grating penetrate through the cooling main board;
the heat exchanger comprises a cavity, 2 flow guide plates, a chirped body Bragg grating and a heat exchanger, wherein the cavity is divided into a first cavity, a cooling cavity and a second cavity by the 2 flow guide plates;
the cover plate is positioned at the opening and used for sealing and cooling the main board;
the water filling port is communicated with the first cavity, and the water outlet is communicated with the second cavity.
Further, the guide plate is perpendicular to the cover plate, and the guide plate comprises a first guide plate and a second guide plate which are arranged in parallel.
Further, the chirp bodyThe distance between the Bragg grating and the 2 guide plates is d 1 The distance between the chirped Bragg grating and the bottom wall of the cooling cavity and the distance between the chirped Bragg grating and the cover plate are d 2 And d 1 ＝d 2 。
Further, the width of the diversion slit is d 3 And d 3 ＝2d 1 ＝2d 2 。
Further, the width d of the flow guiding seam 3 Is 1 mm-10 mm.
Further, a first sealing ring is arranged at the joint of the surface of the cover plate and the opening, and a second sealing ring is arranged at the joint of the cooling main plate and the penetrating of the chirped Bragg grating.
Further, the cooling device further comprises 2 side plates positioned on the outer side of the cooling main plate, and the 2 side plates are respectively positioned at the penetrating connection parts of the cooling main plate and the chirped Bragg grating.
Further, the two ends of the chirped Bragg grating penetrate through the side plates respectively, and the side plates are connected with the cooling main plate through connecting pieces.
In addition, the application also provides a cooling method of the chirped Bragg grating cooling system, which comprises the following steps:
s1: cooling water is injected into the first cavity through the water injection port;
s2: the cooling water is converged into uniform strip-shaped water flow through the guide slits on the first guide plate, and is injected into the cooling cavity;
s3: the strip water flows through the side surface of the chirped Bragg grating to cool the chirped Bragg grating;
s4: the water flow after cooling the chirped Bragg grating is converged again into uniform strip-shaped water flow through the flow guide slits on the second flow guide plate, and is injected into the second cavity and discharged through the water outlet.
The beneficial effects of the application are as follows:
1. the cooling main board is internally provided with the cavity, the chirped Bragg grating is arranged in the cavity for cooling, the cover board and the side boards are used for sealing, the structure is compact, the cost is low, meanwhile, the cavity is divided into 3 cavities by the guide plate, the chirped Bragg grating is in a cuboid structure, the guide seam is used for shaping cooling water into uniform strip water flow, the cooling uniformity is enhanced, and the cooling efficiency is improved.
2. The cavity is filled with cooling water, a water cooling structure is adopted, the refrigerating capacity is high, meanwhile, the cooling water circulates for refrigeration, the cooling efficiency is high, the effect is obvious, and the laser device is suitable for high-power laser with the power of more than hundred watts.
Drawings
FIG. 1 is a schematic top view of the overall structure of the present application;
FIG. 2 is a schematic side view of the present application;
FIG. 3 is a schematic view of a flow-guiding seam according to the present application;
FIG. 4 is a schematic diagram of the cover plate structure of the present application;
fig. 5 is a schematic diagram of a cooling water circuit in a cavity according to the present application.
In the accompanying drawings: 1-cooling main board, 101-first cavity, 102-cooling cavity, 103-second cavity, 2-deflector, 201-first deflector, 202-second deflector, 203-guide slit, 3-chirped Bragg grating, 4-side board, 5-connector, 6-second sealing ring, 7-cover board, 8-first sealing ring, 9-window, 10-water filling port, 11-water outlet;
the direction of the arrow in fig. 5 indicates the flow direction of the cooling water.
Detailed Description
In order to make the technical solution of the present application better understood by those skilled in the art, the technical solution of the present application will be clearly and completely described in the following with reference to the accompanying drawings, and based on the embodiments of the present application, other similar embodiments obtained by those skilled in the art without making any inventive effort should be included in the scope of protection of the present application. In addition, directional words such as "upper", "lower", "left", "right", and the like, as used in the following embodiments are merely directions with reference to the drawings, and thus, the directional words used are intended to illustrate, not to limit, the application.
Embodiment one:
as shown in fig. 1-4, a chirped bragg grating cooling system comprises a cooling main board 1, 2 guide plates 2 and a cover plate 7, wherein an opening is arranged at the top of the cooling main board 1, a cavity for accommodating a chirped bragg grating 3 is arranged in the cooling main board, in order to enhance the stability of the chirped bragg grating 3, two ends of the chirped bragg grating 3 respectively penetrate through the cooling main board 1, that is, the chirped bragg grating 3 and the cooling main board 1 are connected in a penetrating manner, and a second sealing ring 6 is arranged at the penetrating connection position, so that the sealing performance of the cavity is enhanced.
The 2 flow guide plates 2 are arranged in parallel, and divide the cavity into a first cavity 101, a cooling cavity 102 and a second cavity 103 in sequence, the chirped bragg grating 3 is located in the cooling cavity 102, in view of the rectangular parallelepiped structure of the chirped bragg grating 3, flow guide slits 203 are formed on the flow guide plates 2 along the length direction of the chirped bragg grating 3, that is, the first cavity 101, the cooling cavity 102 and the second cavity 103 are respectively communicated through the flow guide slits 203. The cooling main board 1 is provided with a water injection port 10 and a water outlet 11, wherein the water injection port 10 is communicated with the first cavity 101, and the water outlet 11 is communicated with the second cavity 103.
The cover plate 7 is located at the opening and is used for sealing and cooling the main board 1, in order to further increase the tightness, a first sealing ring 8 is arranged at the joint of the surface of the cover plate 7 and the opening, and meanwhile, a window 9 is formed in the cover plate 7 to observe the cooling process in the cavity. In addition, the cooling mainboard 1 outside is equipped with 2 curb plates 4, 2 curb plates 4 are located the running through department of meeting of cooling mainboard 1 and chirp body bragg grating 3 respectively, seal the both ends face of chirp body bragg grating 3, the curb plate 4 is run through respectively at the both ends of chirp body bragg grating 3, curb plate 4 is connected through connecting piece 5 with cooling mainboard 1, connecting piece 5 are the bolt preferably.
The baffle 2 is perpendicular to the cover plate 7, the baffle 2 includes a first baffle 201 and a second baffle 202, and in order to enhance cooling uniformity, the distance between the chirped bragg grating 3 and the first baffle 201 and the distance between the chirped bragg grating 3 and the second baffle 202 are d 1 The distance between the chirped Bragg grating 3 and the bottom wall and the cover plate 7 of the cooling cavity 102 is d 2 And d 1 ＝d 2 The width of the guide slit 203 is d 3 And d 3 ＝2d 1 ＝2d 2 The width of the diversion seamDegree d 3 And the water pressure in the cooling cavity 102 is ensured to be 1-10 mm, and meanwhile, the area of the diversion slit 203 is smaller than the areas of the water inlet 10 and the water outlet 11 so as to meet the requirement of the chirped Bragg grating 3 on the cooling water quantity.
Embodiment two:
as shown in fig. 1 to 5, the same parts as those of the first embodiment are not repeated, and the cooling method using the chirped bragg grating cooling system includes the following steps:
s1: cooling water is injected into the first cavity 101 through the water injection port 10;
s2: the cooling water passes through the diversion slits 203 on the first diversion plate 201, the diversion slits 203 are arranged along the length direction of the chirped Bragg grating 3, and the water flow forms a long strip along the length direction of the chirped Bragg grating 3, that is, the cooling water is converged into uniform long strip water flow and injected into the cooling cavity 102, so that the refrigerating capacity is high;
s3: the strip-shaped water flows through the side surface of the chirped Bragg grating 3 to cool different side surfaces of the chirped Bragg grating 3 so as to reduce the temperature of the chirped Bragg grating;
s4: the water flow after cooling the chirped Bragg grating 3 is converged into uniform strip-shaped water flow again through the flow guide slits 203 on the second flow guide plate 202, and is injected into the second cavity 103 to be discharged through the water outlet 11, and the cooling water is circularly cooled, so that the cooling efficiency is high, the effect is obvious, and the high-power laser light source is suitable for high-power laser light with the power of more than hundred watts.
Through setting up the cavity in cooling mainboard 1 inside, place chirp body bragg grating 3 in the cavity and cool off to seal with apron 7 and curb plate 4, compact structure, with low costs, simultaneously, utilize guide plate 2 to separate into 3 chambeies with the cavity, in view of chirp body bragg grating 3 is cuboid structure, utilize water conservancy diversion seam 203 with the cooling water plastic into even rectangular rivers, reinforcing cooling uniformity improves cooling efficiency. In addition, the water cooling structure is adopted, so that the device has the characteristics of large refrigerating capacity and high cooling efficiency, and is suitable for high-power laser with the power of more than hundred watts.
In this embodiment, the laser power is 100W, the size of the chirped bragg grating 3 is 5mm by 20mm, d 1 ＝d 2 The temperature of the chirped bragg grating 3 is 30 ℃ and the temperature of the chirped bragg grating 3 is 80 ℃ by adopting a traditional air cooling mode, that is, the cooling effect of the application is obvious, and the application is applicable to high-power laser with hundreds of watts or more.
Embodiment III:
the same parts as those of the embodiment are not described in detail, except that:
the laser power is 120W, the size of the chirped Bragg grating 3 is 10mm 50mm, and d 1 ＝d 2 =1mm, the temperature of the chirped bragg grating 3 is 32 ℃, and the temperature of the chirped bragg grating 3 is 85 ℃ by adopting a conventional air cooling method, which is described again: the application has obvious cooling effect and is suitable for high-power laser with the power of hundreds of watts.
The foregoing detailed description of the application has been presented for purposes of illustration and description, but is not intended to limit the scope of the application, i.e., the application is not limited to the details shown and described.
Claims (9)
1. A chirped volume bragg grating cooling system, comprising:
the cooling main board is provided with an opening at the top, a cavity for accommodating the chirped Bragg grating is arranged in the cooling main board, and two ends of the chirped Bragg grating penetrate through the cooling main board;
the cooling device comprises a cavity, and is characterized by comprising 2 flow guide plates positioned in the cavity, wherein the 2 flow guide plates divide the cavity into a first cavity, a cooling cavity and a second cavity in sequence, the chirped Bragg grating is positioned in the cooling cavity, flow guide slits are arranged on the flow guide plates along the length direction of the chirped Bragg grating, and the first cavity, the cooling cavity and the second cavity are respectively communicated through the flow guide slits;
the cover plate is positioned at the opening and used for sealing and cooling the main board;
the water filling port is communicated with the first cavity, and the water outlet is communicated with the second cavity.
2. The chirped bragg grating cooling system of claim 1 wherein the baffle is perpendicular to the cover plate, the baffle comprising a first baffle and a second baffle disposed in parallel.
3. The chirped bragg grating cooling system of claim 1 wherein the distance between the chirped bragg grating and the 2 flow deflectors is d1, the distance between the chirped bragg grating and the bottom wall and the cover plate of the cooling cavity is d2, and d1=d2.
4. A chirped bragg grating cooling system according to claim 3, wherein the width of the flow guide slit is d3 and d3=2d1=2d2.
5. The chirped bragg grating cooling system of claim 4 wherein the width d3 of the flow guide slit is 1mm to 10mm.
6. The chirped bragg grating cooling system of claim 1 wherein a first sealing ring is disposed at a junction between the surface of the cover plate and the opening, and a second sealing ring is disposed at a junction between the cooling main plate and the chirped bragg grating.
7. The chirped bragg grating cooling system of any of claims 1-6 further comprising 2 side plates located outside the cooling motherboard, the 2 side plates being located at the through-junctions of the cooling motherboard and the chirped bragg grating, respectively.
8. The chirped bragg grating cooling system of claim 7 wherein the ends of the chirped bragg grating extend through the side plates respectively, the side plates being connected to the cooling master plate by connectors.
9. A cooling method using the chirped bragg grating cooling system according to any one of claims 1 to 8, comprising the steps of:
s1: cooling water is injected into the first cavity through the water injection port;
s2: the cooling water is converged into uniform strip-shaped water flow through the guide slits on the first guide plate, and is injected into the cooling cavity;
s3: the strip water flows through the side surface of the chirped Bragg grating to cool the chirped Bragg grating;
s4: the water flow after cooling the chirped Bragg grating is converged again into uniform strip-shaped water flow through the flow guide slits on the second flow guide plate, and is injected into the second cavity and discharged through the water outlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710253310.8A CN107046219B (en) | 2017-04-18 | 2017-04-18 | Cooling system and cooling method for chirped Bragg grating |
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| CN201710253310.8A CN107046219B (en) | 2017-04-18 | 2017-04-18 | Cooling system and cooling method for chirped Bragg grating |
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| CN107046219A CN107046219A (en) | 2017-08-15 |
| CN107046219B true CN107046219B (en) | 2023-10-24 |
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| JP7252220B2 (en) * | 2018-05-28 | 2023-04-04 | ギガフォトン株式会社 | Optical pulse stretcher, laser device, and method for manufacturing electronic device |
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| US6275629B1 (en) * | 1998-09-11 | 2001-08-14 | Lucent Technologies Inc. | Optical grating devices with adjustable chirp |
| JP2005352196A (en) * | 2004-06-10 | 2005-12-22 | Matsushita Electric Ind Co Ltd | Variable dispersion compensation module |
| CN103247933A (en) * | 2013-04-18 | 2013-08-14 | 江苏金迪电子科技有限公司 | Programmable multi-wavelength adjustable optical fiber laser and multi-wavelength filtering method thereof |
| CN203645127U (en) * | 2013-04-18 | 2014-06-11 | 江苏金迪电子科技有限公司 | A programmable multi-wavelength adjustable fiber laser |
| CN105811231A (en) * | 2016-05-06 | 2016-07-27 | 北京工业大学 | Volume Bragg grating high-energy pisosecond laser |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10017946A1 (en) * | 2000-04-11 | 2002-01-17 | Abb Research Ltd | Fiber laser sensor |
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- 2017-04-18 CN CN201710253310.8A patent/CN107046219B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6275629B1 (en) * | 1998-09-11 | 2001-08-14 | Lucent Technologies Inc. | Optical grating devices with adjustable chirp |
| JP2005352196A (en) * | 2004-06-10 | 2005-12-22 | Matsushita Electric Ind Co Ltd | Variable dispersion compensation module |
| CN103247933A (en) * | 2013-04-18 | 2013-08-14 | 江苏金迪电子科技有限公司 | Programmable multi-wavelength adjustable optical fiber laser and multi-wavelength filtering method thereof |
| CN203645127U (en) * | 2013-04-18 | 2014-06-11 | 江苏金迪电子科技有限公司 | A programmable multi-wavelength adjustable fiber laser |
| CN105811231A (en) * | 2016-05-06 | 2016-07-27 | 北京工业大学 | Volume Bragg grating high-energy pisosecond laser |
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| Title |
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