CN114566860A - Laser absorption device and laser - Google Patents

Laser absorption device and laser Download PDF

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Publication number
CN114566860A
CN114566860A CN202210456944.4A CN202210456944A CN114566860A CN 114566860 A CN114566860 A CN 114566860A CN 202210456944 A CN202210456944 A CN 202210456944A CN 114566860 A CN114566860 A CN 114566860A
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CN
China
Prior art keywords
laser
absorber
beam expanding
expanding element
elements
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202210456944.4A
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Chinese (zh)
Inventor
罗兴旺
陈小明
叶峻芝
张旭光
张雷
高清松
尚建力
鲁燕华
张卫
万敏
唐淳
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Institute of Applied Electronics of CAEP
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Institute of Applied Electronics of CAEP
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Institute of Applied Electronics of CAEP filed Critical Institute of Applied Electronics of CAEP
Priority to CN202210456944.4A priority Critical patent/CN114566860A/en
Publication of CN114566860A publication Critical patent/CN114566860A/en
Pending legal-status Critical Current

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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
    • H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
    • H01S3/1303—Stabilisation of laser output parameters, e.g. frequency or amplitude by using a passive reference, e.g. absorption cell
    • 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
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • H01S3/0071—Beam steering, e.g. whereby a mirror outside the cavity is present to change the beam direction
    • 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
    • H01S3/0401—Arrangements for thermal management of optical elements being part of laser resonator, e.g. windows, mirrors, lenses
    • 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
    • H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping
    • 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
    • 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
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/0601—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium comprising an absorbing region

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Lasers (AREA)

Abstract

The invention relates to a laser absorption device and a laser, belonging to the technical field of lasers, and comprising an absorber and a beam expanding element, wherein the side surface of the absorber is provided with a mounting groove, the beam expanding element is embedded in the mounting groove and used as a laser incident port of the absorber, the interior of the absorber is hollow and used as an absorption cavity of laser, and the laser is incident to the cavity wall surface of the absorption cavity and absorbed after being expanded by the beam expanding element.

Description

Laser absorption device and laser
Technical Field
The invention belongs to the technical field of lasers, and particularly relates to a laser absorption device and a laser.
Background
The residual laser light in the laser device affects the stability, reliability and lifetime of the laser, and therefore, the efficient and reliable absorption of the residual laser light has an important influence on the reliability, stability and the like of the laser system. At present, an absorption cell structure in a conventional laser device is large in size, and under the condition of high-power operation, high-power-density laser is incident into the absorption cell to easily generate micro impurities, so that the surface of an optical element in the laser is polluted, the stability and the service life of the laser are influenced, and even the problem is brought to the operation and maintenance of the laser.
With the development of laser technology and laser requirements, the requirement for the output power of a laser is higher and higher, and the problem of residual laser absorption is also more and more important, and how to realize residual laser absorption in a limited volume is a problem that needs to be solved urgently by those skilled in the art.
Disclosure of Invention
In order to solve the above problems, a laser absorption device and a laser have been proposed.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a laser absorption device, includes absorber and beam expanding element, mounting groove is seted up to the side of absorber, beam expanding element inlays and locates in the mounting groove and regard as the laser incident port of absorber, the absorption cavity of laser is regarded as to the inside cavity of absorber, and laser is incident to the chamber wall surface of absorption cavity and is absorbed after beam expanding element expands the beam.
Furthermore, the beam expanding element is attached to the bottom of the mounting groove, and the included angle between the bottom of the mounting groove and the side surface of the absorber is 0-90 degrees, namely the included angle between the beam expanding element and the side surface of the absorber is 0-90 degrees.
Preferably, the beam expanding element is connected with the groove bottom of the mounting groove in an adhesive manner.
Preferably, the beam expanding element is fixed at the bottom of the mounting groove by a pressing sheet.
Further, the surface of the beam expanding element is plated with a laser waveband antireflection film.
Further, the focal length of the beam expanding element is less than 10 mm.
Further, the absorber is made of a material which absorbs laser light.
Preferably, the absorber is made of copper, aluminum, iron or steel.
Furthermore, the beam expanding elements are arranged in a plurality of numbers, and the beam expanding elements are positioned on the same side, the adjacent side or the opposite side of the absorber.
Furthermore, when the beam expanding elements are arranged in a plurality and are positioned on the opposite side faces of the absorber, the beam expanding elements positioned on the opposite side faces of the absorber are arranged in a staggered mode, and laser escape is prevented.
Preferably, the beam expanding elements on opposite sides of the absorber are offset in the height direction of the absorber.
Preferably, the beam expanding elements on opposite sides of the absorber are offset in the width direction of the absorber.
Preferably, the beam expanding elements on opposite sides of the absorber are inclined at different angles to achieve a staggered arrangement.
Further, the wall surface of the absorption cavity is subjected to blackening treatment or rough treatment.
Furthermore, the absorber is provided with a cooling element, which ensures that the heat of the absorber can be conducted to the cooling element.
In addition, the invention also provides a laser which comprises the laser absorption device.
The invention has the beneficial effects that:
the beam expanding element is used as a laser incident port of the absorber, laser entering the absorber expands beams, the power density and the heat flux density of the laser are reduced, and the laser absorption efficiency and the reliability are improved.
The beam expanding element can block the laser from entering the tiny impurities generated on the surface of the wall of the absorption cavity, so that the pollution to optical elements in the laser is avoided, and the stability and the service life of the laser are improved.
The absorber is made of copper, aluminum, iron or steel, can absorb laser, has high heat-conducting property and ensures that the laser is absorbed in a large amount.
The focal length of the beam expanding element is less than 10mm, so that the laser can be efficiently and reliably absorbed in a limited volume, and the stability, reliability, service life and the like of the laser are obviously improved.
The beam expanding element can be arranged in a plurality of ways, can absorb laser in a plurality of directions, and has high integration level.
The absorber is provided with the cooling element, so that the heat of the absorber can be conducted to the cooling element, and the stability of the absorber is improved.
Drawings
FIG. 1 is a schematic diagram of the structure of one embodiment of a laser light absorption device;
fig. 2 is a schematic structural diagram of another embodiment of a laser light absorption device.
In the drawings: 1-absorber, 2-beam expanding element;
the arrow line in the drawing indicates the laser transmission path.
Detailed Description
In order to make the technical solutions of the present invention better understood, the following description of the technical solutions of the present invention with reference to the accompanying drawings of the present invention is made clearly and completely, and other similar embodiments obtained by a person of ordinary skill in the art without any creative effort based on the embodiments in the present application shall fall within the protection scope of the present application. In addition, directional terms such as "upper", "lower", "left", "right", etc. in the following embodiments are directions with reference to the drawings only, and thus, the directional terms are used for illustrating the present invention and not for limiting the present invention.
The first embodiment is as follows:
as shown in fig. 1, a laser absorption device includes an absorber 1 and a beam expanding element 2, a mounting groove is formed in a side surface of the absorber 1, the beam expanding element 2 is embedded in the mounting groove and serves as a laser incident port of the absorber 1, the interior of the absorber 1 is hollow and serves as an absorption cavity of laser, and the laser is expanded by the beam expanding element 2 and then is incident on a cavity wall surface of the absorption cavity and is absorbed.
The beam expanding element 2 is attached to the bottom of the mounting groove, the included angle between the bottom of the mounting groove and the side face of the absorber 1 is 0-90 degrees, namely the included angle between the beam expanding element 2 and the side face of the absorber 1 is 0-90 degrees, namely the beam expanding element 2 can be mounted in parallel with the side face of the absorber 1, or the beam expanding element 2 can be mounted in a manner of being vertical to the side face of the absorber 1, or the beam expanding element 2 can be mounted in a manner of being inclined to the side face of the absorber 1.
In order to increase the stability of the beam expanding element 2, the beam expanding element 2 is connected to the bottom of the mounting groove by gluing. In other embodiments, the beam expanding element 2 is fixed at the bottom of the mounting groove by a pressing sheet, specifically, the pressing sheet is a folded angle structure, one end of the pressing sheet abuts against the beam expanding element 2, the beam expanding element 2 abuts against the bottom of the mounting groove, and the other end of the pressing sheet extends to the outside of the mounting groove and is connected with the side face of the absorber 1.
The surface of the beam expanding element 2 is plated with a laser waveband antireflection film, specifically, the front surface and the rear surface of the beam expanding element 2 are both plated with laser waveband antireflection films, the front surface is the side surface of the beam expanding element 2 far away from the absorption cavity, and the rear surface is the side surface of the beam expanding element 2 close to the absorption cavity.
The focal length of the beam expanding element 2 is less than 10mm, namely, the laser can be efficiently and reliably absorbed in a limited volume, and the stability, reliability, service life and the like of the laser are obviously improved.
The absorber 1 is made of a material that absorbs laser light. Preferably, the absorber 1 is made of copper, aluminum, iron or steel, that is, the absorber 1 can absorb laser light and has high thermal conductivity, so that the laser light is absorbed in a large amount.
When the absorption cavity is used, laser is expanded and diffused in a short distance after passing through the beam expanding element 2, the laser after expanded and diffused enters the cavity wall surface of the absorption cavity and is absorbed by the absorption body 1, and the cavity wall surface of the absorption cavity is subjected to blackening treatment or rough treatment. That is to say, the beam expanding element 2 is used as a laser incident port of the absorber 1, expands the laser beam entering the absorber 1, reduces the power density and the heat flux density of the laser, and improves the laser absorption efficiency and reliability. Meanwhile, the beam expanding element 2 can prevent laser from being incident to tiny impurities generated on the surface of the wall of the absorption cavity, so that optical elements in the laser are prevented from being polluted, and the stability and the service life of the laser are improved.
In addition, the invention also provides a laser which comprises the laser absorption device.
Example two:
as shown in fig. 1, the same parts of this embodiment as those of the first embodiment are not described again, except that:
the number of the beam expanding elements 2 is 1, the beam expanding elements 2 are biconcave lenses with the effective focal length of 5mm, and the longitudinal section size of the absorber 1 is only 40mm multiplied by 30 mm. The laser with the laser power of more than 500W, the spot diameter of 2mm and the duty ratio of 10% is efficiently and reliably absorbed, the laser spot is expanded to 8mm, the power density and the heat flux density are reduced by 1 order of magnitude, and the long-time continuous and stable operation can be realized.
Example three:
parts of this embodiment that are the same as those of the first embodiment are not described again, except that:
the beam expanding elements 2 are arranged in a plurality of positions, the beam expanding elements 2 are arranged on the same side face of the absorber 1 at intervals and can absorb a plurality of laser beams simultaneously.
The plurality of beam expanding elements 2 are all arranged parallel to the side of the absorber 1, or the inclination angles of the plurality of beam expanding elements 2 are different.
Example four:
parts of this embodiment that are the same as those of the first embodiment are not described again, except that:
the beam expanding elements 2 are arranged in a plurality, and the beam expanding elements 2 are positioned on the adjacent side surfaces of the absorber 1 and can absorb a plurality of multi-direction and multi-beam lasers at the same time.
The plurality of beam expanding elements 2 are all arranged parallel to the side of the absorber 1, or the inclination angles of the plurality of beam expanding elements 2 are different.
Example five:
parts of this embodiment that are the same as those of the first embodiment are not described again, except that:
the beam expanding elements 2 are arranged in a plurality, and the beam expanding elements 2 are positioned on the opposite side surfaces of the absorber 1 and can absorb a plurality of multi-direction and multi-beam lasers at the same time.
Specifically, the beam expanding elements 2 on the opposite sides of the absorber 1 are arranged in a staggered manner along the height direction of the absorber 1, so that the laser is prevented from directly escaping through the beam expanding elements 2 on the opposite sides. Meanwhile, the plurality of beam expanding elements 2 are all arranged in parallel to the side face of the absorber 1, or the inclination angles of the plurality of beam expanding elements 2 are different.
As shown in fig. 2, 2 beam expanding elements 2 are provided, each of the 2 beam expanding elements 2 is a plano-concave lens with an effective focal length of 5mm, and the longitudinal section of the absorber 1 is only 40mm × 30 mm. The laser with the laser power of more than 500W, the spot diameter of 2mm and the duty ratio of 10% is efficiently and reliably absorbed, the laser spot is expanded to 8mm, the power density and the heat flux density are reduced by 1 order of magnitude, and the long-time continuous and stable operation can be realized.
Example six:
parts of this embodiment that are the same as those of the first embodiment are not described again, except that:
the beam expanding elements 2 are arranged in a plurality, and the beam expanding elements 2 are positioned on the opposite side surfaces of the absorber 1 and can absorb a plurality of multi-direction and multi-beam lasers at the same time.
Specifically, the beam expanding elements 2 on the opposite sides of the absorber 1 are arranged in a staggered manner along the width direction of the absorber 1, so that the laser is prevented from directly escaping through the beam expanding elements 2 on the opposite sides. Meanwhile, the plurality of beam expanding elements 2 are all arranged in parallel to the side face of the absorber 1, or the inclination angles of the plurality of beam expanding elements 2 are different.
Example seven:
parts of this embodiment that are the same as those of the first embodiment are not described again, except that:
the beam expanding elements 2 are arranged in a plurality, and the beam expanding elements 2 are positioned on the opposite side surfaces of the absorber 1 and can absorb a plurality of multi-direction and multi-beam lasers at the same time.
Specifically, the inclination angles of the beam expanding elements 2 on the opposite sides of the absorber 1 are different, so that the staggered arrangement is realized, and the laser is prevented from directly escaping through the beam expanding elements 2 on the opposite sides.
Example eight:
in this embodiment, a cooling element is additionally arranged on the basis of the first embodiment to the seventh embodiment, the cooling element is located outside the absorber 1, and a gap is left at a position of the cooling element corresponding to the mounting groove, so that the laser can smoothly pass through the beam expanding element 2, and meanwhile, the heat of the absorber 1 can be conducted to the cooling element.
The present invention has been described in detail, and it should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

Claims (10)

1. The laser absorption device is characterized by comprising an absorber and a beam expanding element, wherein a mounting groove is formed in the side face of the absorber, the beam expanding element is embedded in the mounting groove and serves as a laser incident port of the absorber, the inner cavity of the absorber serves as an absorption cavity of laser, and the laser is incident to the surface of the cavity wall of the absorption cavity after being expanded by the beam expanding element and is absorbed.
2. The laser absorber as claimed in claim 1, wherein the beam expanding element is disposed adjacent to a bottom of the mounting recess, the bottom of the mounting recess being at an angle of 0 ° to 90 ° to the side of the absorber.
3. The laser absorption device as claimed in claim 2, wherein the beam expanding element is coated with a laser band antireflection coating.
4. A laser absorption device as claimed in claim 3, wherein the focal length of the beam expanding element is less than 10 mm.
5. The laser absorbing device as claimed in claim 1, wherein the absorber is made of a material that absorbs laser light.
6. The laser absorption device as claimed in claim 1, wherein the surface of the absorption cavity wall is blackened or roughened.
7. A laser absorption device as claimed in any one of claims 1 to 6, wherein there are a plurality of beam expanding elements, and the plurality of beam expanding elements are located on the same side, adjacent sides or opposite sides of the absorber.
8. The laser absorption device as claimed in claim 7, wherein when the beam expanding elements are provided in plurality and the plurality of beam expanding elements are located on opposite sides of the absorber, the beam expanding elements located on the opposite sides of the absorber are disposed in a staggered manner to prevent the laser light from escaping.
9. A laser absorber according to claim 8 wherein the absorber is provided with cooling elements to ensure that heat from the absorber is conducted to the cooling elements.
10. A laser comprising the laser absorbing device of any one of claims 1 to 9.
CN202210456944.4A 2022-04-28 2022-04-28 Laser absorption device and laser Pending CN114566860A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202210456944.4A CN114566860A (en) 2022-04-28 2022-04-28 Laser absorption device and laser

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Application Number Priority Date Filing Date Title
CN202210456944.4A CN114566860A (en) 2022-04-28 2022-04-28 Laser absorption device and laser

Publications (1)

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CN114566860A true CN114566860A (en) 2022-05-31

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103389157A (en) * 2013-07-26 2013-11-13 西北核技术研究所 High-energy laser beam expanding and absorbing device
CN203859378U (en) * 2014-04-22 2014-10-01 北京瑞尔通激光科技有限公司 Active cooling-type high-energy laser absorption device
CN104133295A (en) * 2014-08-20 2014-11-05 南京中科神光科技有限公司 Laser beam absorption device
CN211879770U (en) * 2020-05-20 2020-11-06 常州天寅智造科技股份有限公司 Energy absorption device of high-power laser engraving system
CN113376845A (en) * 2021-06-21 2021-09-10 中国工程物理研究院激光聚变研究中心 Stray light absorbing device
CN216351316U (en) * 2021-09-08 2022-04-19 常州英诺激光科技有限公司 Laser beam energy absorption device and absorption system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103389157A (en) * 2013-07-26 2013-11-13 西北核技术研究所 High-energy laser beam expanding and absorbing device
CN203859378U (en) * 2014-04-22 2014-10-01 北京瑞尔通激光科技有限公司 Active cooling-type high-energy laser absorption device
CN104133295A (en) * 2014-08-20 2014-11-05 南京中科神光科技有限公司 Laser beam absorption device
CN211879770U (en) * 2020-05-20 2020-11-06 常州天寅智造科技股份有限公司 Energy absorption device of high-power laser engraving system
CN113376845A (en) * 2021-06-21 2021-09-10 中国工程物理研究院激光聚变研究中心 Stray light absorbing device
CN216351316U (en) * 2021-09-08 2022-04-19 常州英诺激光科技有限公司 Laser beam energy absorption device and absorption system

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Application publication date: 20220531