CN114545641A - Quarter lens for laser beam shaping, laser beam shaping system and method - Google Patents
Quarter lens for laser beam shaping, laser beam shaping system and method Download PDFInfo
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- CN114545641A CN114545641A CN202210153633.0A CN202210153633A CN114545641A CN 114545641 A CN114545641 A CN 114545641A CN 202210153633 A CN202210153633 A CN 202210153633A CN 114545641 A CN114545641 A CN 114545641A
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- lens
- quarter
- light spot
- laser beam
- beam shaping
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
- G02B27/0961—Lens arrays
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0006—Arrays
- G02B3/0037—Arrays characterized by the distribution or form of lenses
- G02B3/0056—Arrays characterized by the distribution or form of lenses arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses
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Abstract
The invention discloses a quarter lens for shaping laser beams, a laser beam shaping system and a laser beam shaping method, wherein the quarter lens is provided with a disc-shaped substrate with the radius of R and the thickness of sigma, the bottom surface of the substrate is a plane, the upper surface of the substrate is a rectangular pyramid consisting of four fan-shaped surfaces, the lengths of four edge lines of the rectangular pyramid are equal, the included angles between the opposite first edge line and second edge line and the bottom surface are alpha, the included angles between the other two opposite third edge lines and fourth edge lines and the bottom surface are both Ka, and k is the ratio of the major axis and the minor axis of an elliptic light spot passing through the quarter lens, so that a rectangular light spot with the length-width ratio of k (k is 1.4-3) can be obtained. The invention does not lose laser energy and bears laser peak power density higher than 3GW/cm2Low cost and convenient popularization and use.
Description
Technical Field
The invention belongs to the laser technology and relates to beam shaping of a laser beam.
Background
Since the circular laser crystal is easy to grow and the pumping is uniform, the output of most of the lasers at present is a circular spot with Gaussian distribution. For the heat treatment, laser shock treatment and other processes, the square light spot is required to meet various process requirements, and in the prior art, the square light spot is generally obtained by methods such as a mask, a special integrating mirror and the like. The disadvantages of the prior method are: the use of the mask causes a part of energy loss, and for laser processing techniques requiring large energy, such as laser shock peening, the use of the mask not only causes energy loss but also reduces processing efficiency, and obviously is not a good solution. The special integrator mirror has dozens or even hundreds of processing surfaces, so that the processing cost is high, and the integrator mirror is easy to damage by strong laser. For example, the peak power density borne by the pi-shaping mirror is only 200MW/cm2The shaping mirror can not be used for laser shock peening, and the peak power density is more than 1GW/cm2The laser processing technique of (1). In addition, the shaping mirror is expensive, and thus, there is a great limitation in use of the shaping mirror.
Disclosure of Invention
The invention aims to provide a quarter lens for laser beam shaping, a laser beam shaping system and a laser beam shaping method, wherein the quarter lens does not lose laser energy, is high in borne laser peak power density and is low in cost.
In order to achieve the above object, the present invention proposes the following technical solutions.
In a first aspect, the present invention provides a quarter lens for shaping a laser beam, which has a disc-shaped substrate with a radius R and a thickness σ, and a bottom surface thereof is a plane, and is characterized in that an upper surface of the disc-shaped substrate is a rectangular pyramid consisting of four fan-shaped surfaces, four edge lines of the rectangular pyramid have equal lengths, wherein angles between a first edge line and a second edge line which are opposite to each other and the bottom surface are both α, angles between a third edge line and a fourth edge line which are opposite to each other and the bottom surface are both k α, and k is a ratio of a major axis and a minor axis of an elliptical light spot passing through the quarter lens.
Furthermore, the included angle alpha is 0.01-0.4 radian, and the length-width ratio k is 1.4-3.
Further, the radius R of the disc-shaped substrate is 10-100 mm, the thickness sigma is [ R tan alpha + delta ], wherein delta is the height of the lower end point of the ridge from the bottom surface, and delta is 2-5 mm.
Furthermore, the quarter lens is made of K9 glass or quartz, antireflection films are plated on the two faces after processing, the reflectivity is less than 0.5%, the optical refractive index of the quarter lens adopting K9 glass is 1.5, and the optical refractive index of the quarter lens adopting quartz is 1.45.
In a second aspect, the invention provides a laser beam shaping system, which comprises a positive lens, a negative lens and the quarter lens, wherein a circular light spot is converted into a rectangular light spot through the positive lens, the negative lens and the quarter lens in sequence.
In a third aspect, the present invention provides a laser beam shaping method, comprising:
the circular light spot passes through the positive lens and the negative lens to obtain an elliptical light spot; the oval light spot is converted into a rectangular light spot through the quarter lens according to any one of claims 1 to 3, wherein the long axis of the oval light spot is parallel to the projection of the third ridge line and the fourth ridge line, and the short axis of the oval light spot is parallel to the projection of the first ridge line and the second ridge line.
Further, assuming that the short axis length of the oval light spot is a and the optical refractive index of the quarter lens is 1.5, after 2 a/alpha, the oval light spot is converted into a rectangular light spot with a short side length of a/2 and a long side length of ka/2.
The invention has the following beneficial effects:
the quarter lens provided by the invention does not lose laser energy in laser beam conversion, has high bearable laser peak power density and low cost, and is convenient to popularize and use.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a top view of a quarter lens for laser beam shaping according to an embodiment of the present invention;
FIG. 2 is a side view of a quad-lens for laser beam shaping provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of three-point coordinates of a prism surface of a quarter lens for laser beam shaping according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a structure and spot conversion of a laser beam shaping system according to an embodiment of the present invention.
In the figure:
1-circular light spot; 2-a positive lens; 3-a negative lens; 4-elliptical light spot; 5-a quarter lens; 6-rectangular light spot.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the embodiments described, but covers any modifications, alterations, and improvements in the parts, components, and connections without departing from the spirit of the invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1 and 2, a quarter lens for laser beam shaping according to an embodiment of the present invention has a disc-shaped substrate with a radius R and a thickness σ, a bottom surface of which is a flat surface,
the upper surface of the shaping lens is a rectangular pyramid consisting of A, B, C, D four fan-shaped surfaces, the lengths of four edge lines of the rectangular pyramid are equal, the fan-shaped surfaces A, B, C, D are the same in shape, the included angles between the first edge line AB and the second edge line CD which are opposite to each other and the bottom surface are both alpha, the included angles between the other two opposite third edge lines AC and the fourth edge line BD and the bottom surface are both beta-k alpha, and k is the ratio of the major axis to the minor axis of the elliptical light spot passing through the quarter lens.
In a preferred embodiment, the angle α is 0.01 to 0.4 radian, and the aspect ratio k is 1.4 to 3.
In a preferred embodiment, as shown in fig. 2, the radius R of the disc-shaped substrate is 10 to 100mm, and the thickness σ [ R × tan α + δ ], where δ is the height from the bottom surface of the lower end of the ridge line, and δ is 2 to 5 mm.
In this embodiment, the material of the quarter lens is K9 glass or quartz, the reflectivity of the quarter lens is less than 0.5% after being processed by double-sided antireflection coating, the optical refractive index of the quarter lens is 1.5 using K9 glass, and the optical refractive index of the quarter lens is 1.45 using quartz.
The following table shows the parameters of the quarter-lens for laser beam shaping provided by the embodiment of the present invention, and a specific three-point coordinate diagram is shown in fig. 3.
| R | σ | α | β |
| 50 | 5 | 0.28 | 0.57 |
The four-quarter lens can be used for a laser beam shaping system to convert a circular light spot of an incident laser beam into a rectangular light spot.
As shown in fig. 4, an embodiment of the present invention provides a laser beam shaping system, which includes a positive lens 2, a negative lens 3, and a quarter lens 5.
The principle of the laser beam shaping system is as follows: as shown in fig. 4, the circular light spot 1 passes through the positive lens 2 and the negative lens 3 to obtain an elliptical light spot 4, the elliptical light spot 4 passes through the quarter lens 5, wherein the major axis of the elliptical light spot 4 is parallel to the projection of the ridge lines of AC and BD, the minor axis of the elliptical light spot 4 is parallel to the projection of the ridge lines of AB and CD, and if the minor axis of the elliptical light spot 4 is a and the optical refractive index of the quarter lens 5 is 1.5, the elliptical light spot 4 is converted into a rectangular light spot 6 with a short side length of a/2 and a long side length of ka/2 after passing through 2 a/a.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For embodiments of the method, reference is made to the description of the apparatus embodiments in part. The present invention is not limited to the specific steps and structures described above and shown in the drawings. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The above description is only an example of the present application and is not intended to limit the present application. Various modifications and alterations to this application will become apparent to those skilled in the art without departing from the scope of this invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (7)
1. A quarter lens for shaping laser beams is provided with a disc-shaped base body with a radius R and a thickness sigma, and the bottom surface of the disc-shaped base body is a plane, wherein the upper surface of the disc-shaped base body is a rectangular pyramid consisting of four fan-shaped surfaces, the lengths of four ridge lines of the rectangular pyramid are equal, the included angles between the first and second opposite ridge lines and the bottom surface are alpha, the included angles between the other two opposite third and fourth ridge lines and the bottom surface are k alpha, and k is the ratio of the long axis to the short axis of an elliptic light spot passing through the quarter lens.
2. The lens assembly as claimed in claim 1, wherein the included angle α is 0.01 to 0.4 radian and the length-width ratio k is 1.4 to 3.
3. The lens segment according to claim 1, wherein the radius R of the disc-shaped substrate is 10 to 100mm, and the thickness σ ═ R ═ tan α + δ ], where δ is the height of the lower edge from the bottom surface, and δ ═ 2 to 5 mm.
4. The quarter lens as claimed in any one of claims 1 to 3, wherein the quarter lens is made of K9 glass or quartz, and has a reflectivity of less than 0.5% after being processed by being coated with antireflection film on both sides, and the quarter lens adopts K9 glass with an optical refractive index of 1.5 and quartz with an optical refractive index of 1.45.
5. A laser beam shaping system comprising a positive lens, a negative lens and a quarter lens as claimed in any one of claims 1 to 4, wherein a circular spot is converted into a rectangular spot by sequentially passing through the positive lens, the negative lens and the quarter lens.
6. A method of shaping a laser beam, comprising:
the circular light spot passes through the positive lens and the negative lens to obtain an elliptical light spot; the oval light spot is converted into a rectangular light spot through the quarter lens according to any one of claims 1 to 4, wherein the long axis of the oval light spot is parallel to the projection of the third ridge line and the projection of the fourth ridge line, and the short axis of the oval light spot is parallel to the projection of the first ridge line and the projection of the second ridge line.
7. The laser beam shaping method according to claim 5, wherein assuming that the minor axis length of the elliptical spot is a, the elliptical spot is converted into a rectangular spot having a short side length of a/2 and a long side length of ka/2 after 2a/α.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210153633.0A CN114545641A (en) | 2022-02-18 | 2022-02-18 | Quarter lens for laser beam shaping, laser beam shaping system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210153633.0A CN114545641A (en) | 2022-02-18 | 2022-02-18 | Quarter lens for laser beam shaping, laser beam shaping system and method |
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| Publication Number | Publication Date |
|---|---|
| CN114545641A true CN114545641A (en) | 2022-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210153633.0A Pending CN114545641A (en) | 2022-02-18 | 2022-02-18 | Quarter lens for laser beam shaping, laser beam shaping system and method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6005717A (en) * | 1998-11-17 | 1999-12-21 | Ceramoptec Industries, Inc. | Diode laser beam combiner system |
| JP2006065908A (en) * | 2004-08-24 | 2006-03-09 | Funai Electric Co Ltd | Optical pickup apparatus |
| CN101256287A (en) * | 2008-04-16 | 2008-09-03 | 中国航空工业第一集团公司北京航空制造工程研究所 | Laser beam reshaping five-portion lens and four-portion lens |
| CN106291949A (en) * | 2016-11-09 | 2017-01-04 | 中国航空工业集团公司北京航空制造工程研究所 | A kind of apparatus for shaping of laser beam |
| CN209148979U (en) * | 2018-11-30 | 2019-07-23 | 大族激光科技产业集团股份有限公司 | Laser cutting device and its laser beam reshaping device |
| CN112247378A (en) * | 2020-10-23 | 2021-01-22 | 武汉先河激光技术有限公司 | Optical system for realizing micro-hole taper adjustable machining and machining method |
-
2022
- 2022-02-18 CN CN202210153633.0A patent/CN114545641A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6005717A (en) * | 1998-11-17 | 1999-12-21 | Ceramoptec Industries, Inc. | Diode laser beam combiner system |
| JP2006065908A (en) * | 2004-08-24 | 2006-03-09 | Funai Electric Co Ltd | Optical pickup apparatus |
| CN101256287A (en) * | 2008-04-16 | 2008-09-03 | 中国航空工业第一集团公司北京航空制造工程研究所 | Laser beam reshaping five-portion lens and four-portion lens |
| CN106291949A (en) * | 2016-11-09 | 2017-01-04 | 中国航空工业集团公司北京航空制造工程研究所 | A kind of apparatus for shaping of laser beam |
| CN209148979U (en) * | 2018-11-30 | 2019-07-23 | 大族激光科技产业集团股份有限公司 | Laser cutting device and its laser beam reshaping device |
| CN112247378A (en) * | 2020-10-23 | 2021-01-22 | 武汉先河激光技术有限公司 | Optical system for realizing micro-hole taper adjustable machining and machining method |
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