CN115061283A - Laser light field uniformity shaping device based on all-solid-state anti-Gaussian filter - Google Patents
Laser light field uniformity shaping device based on all-solid-state anti-Gaussian filter Download PDFInfo
- Publication number
- CN115061283A CN115061283A CN202210771543.8A CN202210771543A CN115061283A CN 115061283 A CN115061283 A CN 115061283A CN 202210771543 A CN202210771543 A CN 202210771543A CN 115061283 A CN115061283 A CN 115061283A
- Authority
- CN
- China
- Prior art keywords
- plano
- laser
- lens
- gaussian filter
- convex lens
- 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.)
- Granted
Links
- 238000007493 shaping process Methods 0.000 title claims abstract description 29
- 238000010521 absorption reaction Methods 0.000 claims abstract description 14
- 239000011521 glass Substances 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 4
- 239000005304 optical glass Substances 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 12
- 239000007788 liquid Substances 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000010287 polarization Effects 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 125000001475 halogen functional group Chemical group 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000008685 targeting Effects 0.000 description 1
Images
Classifications
-
- 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
- G02B27/0916—Adapting the beam shape of a semiconductor light source such as a laser diode or an LED, e.g. for efficiently coupling into optical fibers
-
- 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
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
The invention provides a laser light field uniformity shaping device based on an all-solid-state anti-Gaussian filter, which is used for solving the technical problems that the laser characteristics cannot be completely expressed, the light energy utilization rate is low, the light field is interfered and the leakage is easy to occur by adopting liquid shaping in the traditional shaping method. The shaping device comprises a laser, and a collimating mirror and an anti-Gaussian filter lens which are sequentially arranged along the direction of a laser emission light path; the inverse Gaussian filter comprises a plano-convex lens and a plano-concave lens which are sequentially arranged along a light path and have the same refractive index and spherical curvature, and the cambered surface of the plano-concave lens is attached to the cambered surface of the plano-convex lens; laser beams emitted by the laser are collimated by the collimating lens to form collimated beams; the collimated light beams sequentially pass through a plano-convex lens and a plano-concave lens to form collimated laser beams with uniform light fields; the absorption coefficient alpha of the plano-convex lens, the convex curvature radius R of the plano-convex lens and the width of the Gaussian laser beam which is collimated and then enters the inverse Gaussian filter are omega: alpha-4R/omega 2 。
Description
Technical Field
The invention relates to a laser field shaping and homogenizing device, in particular to a laser field uniformity shaping device based on an all-solid-state inverse Gaussian filter.
Background
Lasers have been widely used in various fields such as laser processing, high-density holographic storage, inertial confinement fusion, and the like. The light intensity distribution of the laser beam is generally gaussian, so the laser beam is called gaussian beam, in the application field, the non-uniformity of the gaussian beam directly affects the laser processing capacity, the storage effect, the targeting effect and the like, and how to integrate the gaussian beam into a uniform beam is a goal pursued by many national technologists in the world, and is one of the hot spots of the current world research.
At present, the following four conventional methods for shaping gaussian beams are available:
the first method adopts a diffraction optical element for shaping, and the method has high light energy utilization rate, but destroys the phase distribution of light beams and cannot completely express the characteristics of laser.
The second method is to expand the divergence angle of the laser beam and utilize the area with the slower change of the central intensity of the Gaussian laser beam, and the method has the defects that the light energy utilization rate is very low, but the intensity and the phase information of the laser beam are maintained.
And the third method adopts the light modulation device, realizes the modulation of the light field information by changing the polarization degree of the light field, and has the advantages of changing the light characteristic and higher cost.
The method IV adopts a liquid anti-Gaussian filter, and Chinese patent with publication number CN107272213A provides a laser beam homogenizing, beam expanding and shaping device, and adopts the liquid anti-Gaussian filter to realize Gaussian beam shaping, but the method needs to solve the interference of convection heat halo formed by liquid under high-power laser to a light field and a stable sealing process of the liquid, so as to prevent liquid leakage.
Disclosure of Invention
The invention aims to solve the technical problems that the traditional shaping method cannot completely express laser characteristics, has low light energy utilization rate and light field interference and is easy to leak by adopting liquid shaping, and provides a laser light field uniformity shaping device based on an all-solid-state anti-Gaussian filter.
A laser light field uniformity shaping device based on an all-solid-state anti-Gaussian filter lens is characterized by comprising a laser, and a collimating lens and an anti-Gaussian filter lens which are sequentially arranged along the light path direction of laser emitted by the laser;
the inverse Gaussian filter comprises a plano-convex lens and a plano-concave lens which are sequentially arranged along a light path and have the same refractive index and spherical curvature, and the cambered surface of the plano-concave lens is attached to the cambered surface of the plano-convex lens;
the laser beam emitted by the laser is collimated by the collimating mirror to form a collimated beam;
the collimated light beams sequentially pass through a plano-convex lens and a plano-concave lens to form collimated laser beams with uniform light fields;
the absorption coefficient alpha of the plano-convex lens, the convex curvature radius R of the plano-convex lens and the width of the Gaussian laser beam which is collimated and then enters the inverse Gaussian filter are omega, and the requirements are as follows: alpha-4R/omega 2 。
Further, the plano-convex lens is a lens made of absorption glass by grinding, and the plano-concave lens is a lens made of optical glass by grinding.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention provides a laser light field uniformity shaping device based on an all-solid-state inverse Gaussian filter, which utilizes a plano-convex lens and a plano-concave lens with the same refractive index and curvature to form the inverse Gaussian filter, and the formula alpha is 4R/omega 2 The device and the method for shaping the Gaussian beam by homogenizing and shaping the Gaussian beam are simple in system structure, stable in performance and low in cost.
2. The laser light field uniformity shaping device based on the all-solid-state anti-Gaussian filter lens provided by the invention adopts the anti-Gaussian filter lens to convert Gaussian beams into flat-topped Gaussian beams with good uniformity, the shaped laser phase information is unchanged, the polarization information is unchanged, and the conversion rate of light energy during shaping is improved.
Drawings
Fig. 1 is a schematic structural diagram of a laser light field uniformity shaping device based on an all-solid-state inverse gaussian filter according to the present invention;
fig. 2 is a schematic structural diagram of an inverse gaussian filter according to an embodiment of the present invention.
The specific reference numbers are:
1-a laser; 2-a collimating mirror;
3-inverse Gaussian filter, 31-plano-convex lens and 32-plano-concave lens.
Detailed Description
As shown in fig. 1, a laser light field uniformity shaping device based on an all-solid-state anti-gaussian filter comprises a laser 1, and a collimating mirror 2 and an anti-gaussian filter 3 which are sequentially arranged along a light path direction of laser emitted by the laser 1. The inverse Gaussian filter 3 is all solid and comprises a plano-convex lens 31 and a plano-concave lens 32 which are sequentially arranged along a light path and have the same refractive index and spherical curvature, the plano-convex lens 31 is a lens made of absorption glass by grinding, and the plano-concave lens 32 is a lens made of optical glass by grinding. The cambered surface of the plano-concave lens 32 is attached to the cambered surface of the plano-convex lens 31, and the plano-convex lens 31 is arranged close to the collimating mirror 2. When the laser device works, laser beams emitted by the laser device 1 are collimated by the collimating lens 2 to form collimated beams, and the collimated beams sequentially pass through the plano-convex lens 31 and the plano-concave lens 32 to form collimated laser beams with uniform light fields.
As shown in fig. 2, a schematic structural diagram of the inverse gaussian filter 3 is shown, and the specific shaping principle is as follows:
the radial transmittance T (r) of the inverse Gaussian filter 3 at the position r away from the optical axis of the plano-convex lens 31 is as follows:
T(r)＝exp[-αL(r)]≈T 0 exp[αr 2 /2R]
where α is the absorption coefficient of the planoconvex lens 31, R is the convex curvature radius of the planoconvex lens 31, and l (R) is the thickness of the planoconvex lens 31 at a distance R from the optical axis of the planoconvex lens 31.
Radial transmittance T at the center of the inverse gaussian filter 3 0 Comprises the following steps:
T 0 ＝exp[-αL 0 ]
wherein L is 0 Is a plano-convex lens31 center thickness.
The radial transmittance of the inverse Gaussian filter 3 is in inverse Gaussian distribution, the width of the Gaussian laser beam which is collimated and then enters the inverse Gaussian filter 3 is omega, and the light-passing caliber of the convex lens 31 is larger than the width of the Gaussian laser beam and is omega. Central intensity of light beam is I 0 The radial strength is gaussian:
I r ＝I 0 exp[-2r 2 /ω 2 ]
wherein, I 0 The central intensity of the collimated beam;
after passing through the inverse gaussian filter 3, the laser beam intensity becomes:
I(r)≈I 0 T 0 exp[αr 2 /2R-2r 2 /ω 2 ]
according to the above formula, when α r is 2 /2R-2r 2 /ω 2 Zero, that is, the values of the absorption coefficient α of the planoconvex lens 31, the convex curvature radius R of the planoconvex lens 31, and the laser beam width ω of the collimated light beam satisfy α to 4R/ω 2 When the laser beam is collimated, the intensity of the Gaussian laser beam incident on the inverse Gaussian filter 3 is uniformly distributed, and at the moment, I (r) is approximately equal to I 0 T 0 。
Therefore, in engineering application, the inverse gaussian filter 3 is adopted, and the formula alpha is 4R/omega 2 The values of three parameters of the absorption coefficient alpha of the plano-convex lens 31, the convex curvature radius R of the plano-convex lens 31 and the laser beam width omega are controlled to realize the homogenization and shaping of the Gaussian beam. Generally, according to engineering application requirements, the inverse gaussian filter 3 determines absorption glass selected by the plano-convex lens 31, the absorption coefficient α of the plano-convex lens 31 is a fixed value after the absorption glass is determined by the selected absorption glass material, the value of the convex curvature radius R of the plano-convex lens 31 is determined by the laser beam width ω of gaussian laser needing to be incident, and finally, the intensity of the gaussian laser beam passing through the inverse gaussian filter 3 is uniformly distributed.
If the width of the gaussian laser beam is 50mm in a certain laser working waveband, and the absorption coefficient alpha of the material of the plano-convex lens 31 in the inverse gaussian filter 3 is 0.3, the convex curvature radius R of the plano-convex lens 31 in the inverse gaussian filter is 187.5mm, and the light field distribution is uniform after the light beam penetrates through the inverse gaussian filter 3.
According to the invention, the inverse Gaussian filter 3 is adopted, so that the Gaussian beam is converted into the flat-topped Gaussian beam with better uniformity, the shaped laser phase information is unchanged, the polarization information is unchanged, and the conversion rate of light energy during shaping is improved; meanwhile, a device and a method with simple system structure, stable performance and low cost are provided for the shaping of the Gaussian beam.
Claims (2)
1. The utility model provides a laser light field homogeneity shaping device based on anti-gaussian optical filter of all solid-state which characterized in that: the laser comprises a laser (1), and a collimating mirror (2) and an inverse Gaussian filter (3) which are sequentially arranged along the light path direction of laser emitted by the laser (1);
the anti-Gaussian filter (3) comprises a plano-convex lens (31) and a plano-concave lens (32) which are sequentially arranged along a light path and have the same refractive index and spherical curvature, and the cambered surface of the plano-concave lens (32) is attached to the cambered surface of the plano-convex lens (31);
laser beams emitted by the laser (1) are collimated by the collimating mirror (2) to form collimated beams;
the collimated light beams sequentially pass through a plano-convex lens (31) and a plano-concave lens (32) to form collimated laser beams with uniform light fields;
the absorption coefficient alpha of the plano-convex lens (31), the convex curvature radius R of the plano-convex lens (31) and the width of the Gaussian laser beam incident on the inverse Gaussian filter (3) after collimation are omega, and the requirements are as follows: alpha-4R/omega 2 。
2. The laser light field uniformity shaping device based on the all-solid-state inverse Gaussian filter according to claim 1, characterized in that:
the plano-convex lens (31) is a lens made of absorption glass by grinding, and the plano-concave lens (32) is a lens made of optical glass by grinding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210771543.8A CN115061283B (en) | 2022-06-30 | 2022-06-30 | Laser light field uniformity shaping device based on all-solid-state anti-Gaussian filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210771543.8A CN115061283B (en) | 2022-06-30 | 2022-06-30 | Laser light field uniformity shaping device based on all-solid-state anti-Gaussian filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115061283A true CN115061283A (en) | 2022-09-16 |
| CN115061283B CN115061283B (en) | 2024-01-30 |
Family
ID=83203459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210771543.8A Active CN115061283B (en) | 2022-06-30 | 2022-06-30 | Laser light field uniformity shaping device based on all-solid-state anti-Gaussian filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115061283B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007114655A (en) * | 2005-10-24 | 2007-05-10 | Olympus Corp | Uniform illumination device |
| CN201600507U (en) * | 2009-11-27 | 2010-10-06 | 西安华科光电有限公司 | Green light collimating and beam-expanding dodging optical system |
| TW201122539A (en) * | 2009-12-21 | 2011-07-01 | Ind Tech Res Inst | Multi-wavelength coherent light beam shaping device and design method thereof and shaping method |
| CN107272213A (en) * | 2017-07-25 | 2017-10-20 | 中国科学院西安光学精密机械研究所 | Laser beam homogenizing, beam expanding and shaping device |
| WO2020094148A1 (en) * | 2018-11-09 | 2020-05-14 | Thermo Fisher Scientific (Shanghai) Instruments Co., Ltd. | Optical system and flow cytometer |
| WO2020239129A1 (en) * | 2019-05-30 | 2020-12-03 | 西安精英光电技术有限公司 | Combined lens-based line laser homogenization generation apparatus |
| CN213399086U (en) * | 2020-11-06 | 2021-06-08 | 吉林省春曦光电科技有限公司 | Large-zoom-ratio multi-wavelength laser shaping beam expanding collimating lens |
-
2022
- 2022-06-30 CN CN202210771543.8A patent/CN115061283B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007114655A (en) * | 2005-10-24 | 2007-05-10 | Olympus Corp | Uniform illumination device |
| CN201600507U (en) * | 2009-11-27 | 2010-10-06 | 西安华科光电有限公司 | Green light collimating and beam-expanding dodging optical system |
| TW201122539A (en) * | 2009-12-21 | 2011-07-01 | Ind Tech Res Inst | Multi-wavelength coherent light beam shaping device and design method thereof and shaping method |
| CN107272213A (en) * | 2017-07-25 | 2017-10-20 | 中国科学院西安光学精密机械研究所 | Laser beam homogenizing, beam expanding and shaping device |
| WO2020094148A1 (en) * | 2018-11-09 | 2020-05-14 | Thermo Fisher Scientific (Shanghai) Instruments Co., Ltd. | Optical system and flow cytometer |
| WO2020239129A1 (en) * | 2019-05-30 | 2020-12-03 | 西安精英光电技术有限公司 | Combined lens-based line laser homogenization generation apparatus |
| CN213399086U (en) * | 2020-11-06 | 2021-06-08 | 吉林省春曦光电科技有限公司 | Large-zoom-ratio multi-wavelength laser shaping beam expanding collimating lens |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115061283B (en) | 2024-01-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107272213B (en) | Laser beam homogenizing, beam expanding and shaping device | |
| CN1047445C (en) | Beam-shaping optical element and radiation source unit and scanning unit including said element | |
| CN102380709B (en) | Flattened Gaussian beam picopulse laser processing system | |
| CN113751892B (en) | Thick material cutting system based on laser facula energy shaping | |
| CN201518072U (en) | Multi-focus regulating and controlling system | |
| CN110076449A (en) | Realize the laser head assembly of big aspect ratio processing | |
| CN101290398A (en) | Method for accomplishing light beam uniformization and optical device | |
| CN110554510A (en) | Optical imaging system of transmission type diffraction optical element | |
| CN106526872A (en) | Transmission type laser beam shaping system | |
| CN104020566B (en) | Two-dimensional large-scale laser beam array duty ratio adjusting device | |
| CN111965832A (en) | Variable-power laser beam shaping optical system | |
| CN110609392A (en) | Optical imaging system and method based on reflective diffraction optical element | |
| CN114597762A (en) | Blue light semiconductor laser beam combining device and high-brightness blue light output method | |
| CN105189017A (en) | Device for generating laser radiation having a linear intensity distribution | |
| Shealy | History of beam shaping | |
| CN115061283A (en) | Laser light field uniformity shaping device based on all-solid-state anti-Gaussian filter | |
| CN204679716U (en) | Polarization characteristic is utilized to generate the apparatus for shaping of parallel flat top beam | |
| Wang et al. | A homogeneous focusing system for diode lasers and its applications in metal surface modification | |
| CN109633916A (en) | A kind of array bottle beams system based on bar item | |
| CN115826254B (en) | Flat-top beam modulation method, system and storage medium | |
| CN210010591U (en) | Laser head device for realizing large depth-diameter ratio processing | |
| CN109491097B (en) | Method for generating axisymmetric vector light beam based on crystal optical activity | |
| CN103885186A (en) | Astigmatism eliminating light beam shaping system based on prism pair and cylindrical mirror | |
| CN114859565B (en) | Coaxial reflection type laser beam shaping method and device | |
| CN201373948Y (en) | Beam polarization state converting and regulating system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |