CN110146991A - A kind of laser facula shaping optical system - Google Patents
A kind of laser facula shaping optical system Download PDFInfo
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- CN110146991A CN110146991A CN201910314179.0A CN201910314179A CN110146991A CN 110146991 A CN110146991 A CN 110146991A CN 201910314179 A CN201910314179 A CN 201910314179A CN 110146991 A CN110146991 A CN 110146991A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 52
- 238000007493 shaping process Methods 0.000 title claims abstract description 15
- 238000001914 filtration Methods 0.000 claims abstract description 10
- 239000013307 optical fiber Substances 0.000 claims abstract description 10
- 230000009466 transformation Effects 0.000 claims description 18
- 230000010287 polarization Effects 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000004313 glare Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
Classifications
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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
- G02B27/0944—Diffractive optical elements, e.g. gratings, holograms
-
- 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
-
- 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
- G02B27/0972—Prisms
-
- 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
- G02B27/0994—Fibers, light pipes
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
- Laser Beam Processing (AREA)
Abstract
The present invention is intended to provide a kind of laser facula shaping optical system eliminated high-order Fraunhofer diffraction and uniform laser hot spot can be obtained.The present invention includes the laser set gradually along same axis, collimator, beam expanding lens and 4F low-pass filtering optical module, the laser is connect by optical fiber with the collimator, the collimator is connect with the beam expanding lens, the 4F low-pass filtering optical module includes the first diaphragm set gradually along same axis, first fourier lense, pinhole diaphragm and the second fourier lense, the rear focus of first fourier lense and described and the second fourier lense front focus are overlapped, the pinhole diaphragm is located in the rear focus of first fourier lense, first fourier lense is identical as the focal length of second fourier lense.The present invention is applied to the technical field of laser facula shaping.
Description
Technical field
The present invention relates to a kind of laser facula shaping optical systems.
Background technique
With the development of the times, more and more optical elements enter in our various electronic apparatus consumer products,
Such as the face 3D identification function in mobile phone just as diffraction optic component forms spot array, thus according to image acquisition and processing number
According in onboard camera and mobile lens, the special optical component of outer dimension is also largely occurring.In optical element
In detection, the diffraction efficiency of transmission measurement or diffraction optic component is very important detection project, with optical element
Volume towards miniaturization, randomization development, bore and size and light beam to incident light produce higher requirement, Yi Xieyan
Penetrating optic component also has regulation to the characteristics such as the beam quality of incident light and polarization, and smaller in order to obtain such area, energy is equal
The laser of even laser facula, can compress laser beam using free form surface, and the methods of diffraction optic component obtains.Diffraction light
Component and Free-Form Surface Machining difficulty are high, with high costs, it is necessary to according to the angle of divergence of incident laser, hot spot bore, wavelength
Etc. characteristics carry out single adaptation and need to redesign processing said elements if a certain condition of any of the above changes, lead to
It is very poor with property.If diaphragm shape is too small when intercepting beam energy with diaphragm, it will cause strong Fraunhofer diffraction, lead to light
The blur margin of spot is clear, and beam energy uniformity is deteriorated.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a kind of elimination high-order husband's thinkling sound's standing grain
Fraunhofer-diffraction and the laser facula shaping optical system that uniform laser hot spot can be obtained.
The technical scheme adopted by the invention is that: the present invention include the laser set gradually along same axis, collimator,
Beam expanding lens and 4F low-pass filtering optical module, the laser are connect by optical fiber with the collimator, the collimator and
The beam expanding lens connection, the 4F low-pass filtering optical module includes the first diaphragm set gradually along same axis, first Fu
In leaf lens, pinhole diaphragm and the second fourier lense, in the rear focus of first fourier lense and described and second Fu
The front focus of leaf lens is overlapped, and the pinhole diaphragm is located in the rear focus of first fourier lense, in first Fu
Leaf lens are identical as the focal length of second fourier lense.
By above scheme as it can be seen that having the very big angle of divergence from the laser that the laser issues, pass through the collimator pair
Laser is collimated, and collimator can be transmission-type, is also possible to reflective, and wherein transmission-type can be monolithic aspheric
Three pieces spherical mirror structure type can also be used in face.Light spot energy after collimation is excessively concentrated, by expanding described in setting
Mirror keeps the energy at center smoothened, is reduced by the energy peak at the center of hot spot after the beam expanding lens, and hot spot bore becomes larger,
The extrorse decreasing energy of beam center becomes more gentle.Laser is intercepted by first diaphragm, by first light
Laser after door screen has than stronger Fraunhofer diffraction, by being arranged the pinhole diaphragm in first Fourier
The overlapping position of the rear focus of lens and described and the second fourier lense front focus intercepts the husband generated at first diaphragm
Thinkling sound's standing grain fraunhofer-diffraction, normal light then pass through the pin hole of the pinhole diaphragm, and the face vertical with optical axis where pin hole is referred to as
Frequency plane.The pinhole diaphragm can be set to fixed-size, may be alternatively provided as adjustable vane type diaphragm, can also be with
It is replaceable different size of circular hole, the center of the pinhole diaphragm is not more than with the optical axis Concentricity tolerance of 4f system
0.02mm.Light forms first light by the rear focus of second fourier lense, also referred to as final image planes at this
The picture of door screen, and then obtain the ideal hot spot uniformly collimated.Of the invention is compact-sized, stable, and adjustable part is easy
Debugging, does not influence the image quality of optical system, high reliablity, wherein adjustable section is divided into laser, the first diaphragm and pin hole
Diaphragm.Distance is reasonable between optical element simultaneously, and overall optical system can carry out to splitting into mould group, transport, installation and
It is easy to use.
One preferred embodiment is that first diaphragm is located in the front focus of first fourier lense.
By above scheme as it can be seen that by the way that first diaphragm is arranged in the front focus of first fourier lense,
Make by light beam collect at the pinhole diaphragm and intercept the Fraunhofer diffraction of generation.
One preferred embodiment is that the enlargement ratio of the beam expanding lens is two to ten times.
One preferred embodiment is that the collimator is reflective laser collimator.
One preferred embodiment is that the laser is optical fiber laser, and the optical fiber is single-mode polarization maintaining fiber.
By above scheme as it can be seen that guaranteeing the beam quality of laser by using single-mode polarization maintaining fiber as output equipment
And polarization characteristic.
One preferred embodiment is that the pinhole diaphragm is vane type diaphragm.
By above scheme as it can be seen that keeping its adjusting more convenient as the pinhole diaphragm by using vane type diaphragm.
One preferred embodiment is to be provided with optical beam transformation group between first diaphragm and first fourier lense
Part, spacing between first diaphragm and first fourier lense are L, L=F+(1-1/n) * d, wherein F is described the
The focal length of one fourier lense, n are refractive index of the optical beam transformation component in the case where present laser is using wavelength, and d is the light
The thickness of beam conversion assembly.
By above scheme as it can be seen that some testees have special requirement to polarization state, by increasing institute in the optical path
Optical beam transformation component is stated to control the polarization state of laser, increases and changes described by above-mentioned formula after the optical beam transformation component
One diaphragm and first fourier lense are to meet the requirement to optical path.
One preferred embodiment is that the optical beam transformation component is Amici prism or polarizing film or wave plate.
By above scheme as it can be seen that by setting Amici prism real-time monitoring can be carried out to system gross energy, rib will be divided
Mirror is drawn a beam energy and is used as detection；Change the polarization direction of laser by setting polarizing film；By the way that wave plate is arranged by line
Polarization laser changes into circularly polarized laser.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is the structural schematic diagram of the first state of 4F low-pass filtering optical module described in embodiment two；
Fig. 3 is the structural schematic diagram of the second state of 4F low-pass filtering optical module described in embodiment two.
Specific embodiment
Embodiment one:
As shown in Figure 1, in the present embodiment, the present invention includes the laser 1 set gradually along same axis, collimator 2, expands
Mirror 3 and 4F low-pass filtering optical module 4, the laser 1 are connect by optical fiber 5 with the collimator 2, the collimator 2
Connect with the beam expanding lens 3, the 4F low-pass filtering optical module 4 include the first diaphragm 41 set gradually along same axis,
First fourier lense 42, pinhole diaphragm 43 and the second fourier lense 44, the rear focus of first fourier lense 42 and
Described and the second fourier lense 44 front focus is overlapped, after the pinhole diaphragm 43 is located at first fourier lense 42
In focus, first fourier lense 42 is identical as the focal length of second fourier lense 44.
First fourier lense 42 can be single spherical mirror with second fourier lense 44, can be multiple
The lens group of spherical mirror composition, can also be single aspherical mirror；Wherein lens group can be glued mirror, or airspace
Lens group.
First diaphragm 41 is located in the front focus of first fourier lense 42.
The center at the center of the light passing part of first diaphragm 41 and first diaphragm 41.First diaphragm 41
The edge impulse- free robustness of light passing part, the thickness of first diaphragm 41 is within 0.1mm, and the outer diameter of diaphragm is to ensure except light admission port
Light other than diameter cannot be by being advisable, and then prevents from introducing veiling glare.
The enlargement ratio of the beam expanding lens 3 is two to ten times.
The collimator 2 is reflective laser collimator.The collimator 2 is also possible to transmission-type, and transmission-type can be with
It is aspherical for monolithic, three pieces spherical mirror structure type can also be used.
The laser 1 is optical fiber laser, and the optical fiber 5 is single-mode polarization maintaining fiber.
The pinhole diaphragm 43 is vane type diaphragm.The pinhole diaphragm 43 is also possible to fixed-size, is also possible to
Replaceable different size of circular hole.
Beam quality can be adjusted by pin hole, and the size of hot spot can be changed by replacement diaphragm.
If desired the light hole of first diaphragm 41 and the magnification ratio β of hot spot are not 1, first fourier lense
The focal length f2 of 42 focal length f1 and second fourier lense 44 needs proportion relation, relationship be β=D2/D1=
F1/f2, wherein D1 is the bore of the laser facula obtained, and D2 is the bore of 41 light hole of the first diaphragm.
Workflow of the invention:
The laser issued from the laser 1 has the very big angle of divergence, is collimated by the collimator 2 to laser.By
Light spot energy after collimation is excessively concentrated, and the beam expanding lens 3 keeps the energy at center smoothened, passes through light after the beam expanding lens 3
The energy peak at the center of spot reduces, and hot spot bore becomes larger, and the extrorse decreasing energy of beam center becomes more gentle.Light beam
When reaching first diaphragm 41, first diaphragm 41 intercepts the light beam that laser forms certain cross sectional, by described
Laser after first diaphragm 41 has than stronger Fraunhofer diffraction, and the pinhole diaphragm 43 intercepts first diaphragm
Locate the Fraunhofer diffraction generated, normal light then passes through the pin hole of the pinhole diaphragm 43, and light passes through second Fu
In after leaf lens 44, be also referred to as forming first diaphragm 41 in final image planes in the rear focus of second fourier lense 44
Picture, and then the ideal hot spot uniformly collimated.
Embodiment two:
As shown in Fig. 2, the present embodiment and embodiment one the difference is that: first diaphragm 41 and first Fourier
Optical beam transformation component 6, the spacing between first diaphragm 41 and first fourier lense 42 are provided between lens 42
For L, L=F+(1-1/n) * d, wherein F is the focal length of first fourier lense 42, and n is that the optical beam transformation component 6 is being worked as
Preceding laser uses the refractive index under wavelength, and d is the thickness of the optical beam transformation component 6.
The optical beam transformation component 6 is Amici prism or polarizing film or wave plate.
As shown in figure 3, when needing to increase the quantity of the optical beam transformation component 6, one optical beam transformation of every increase
Component 6 needs to increase the spacing L between first diaphragm 41 and first fourier lense 42 on the basis of original,
Numerical value E=(1-1/n of middle increasee) * de, wherein neIt is the increased optical beam transformation component 6 herein using the folding under wavelength
Penetrate rate, deFor the thickness of the increased optical beam transformation component 6, therefore increase described first after the optical beam transformation component 6
Spacing L between diaphragm 41 and first fourier lense 42e=L+E。
The present invention is applied to the technical field of laser facula shaping.
Although the embodiment of the present invention is described with practical solution, the limit to meaning of the present invention is not constituted
It makes, for those skilled in the art, is all to the modification of its embodiment and with the combination of other schemes according to this specification
Obviously.
Claims (8)
1. a kind of laser facula shaping optical system, it is characterised in that: it includes the laser set gradually along same axis
(1), collimator (2), beam expanding lens (3) and 4F low-pass filtering optical module (4), the laser (1) pass through optical fiber (5) and institute
Collimator (2) connection is stated, the collimator (2) connect with the beam expanding lens (3), 4F low-pass filtering optical module (4) packet
It includes along the first diaphragm (41), the first fourier lense (42), pinhole diaphragm (43) and second Fu that same axis is set gradually
Leaf lens (44), the rear focus of first fourier lense (42) and described and the second fourier lense (44) front focus weight
It closes, the pinhole diaphragm (43) is located in the rear focus of first fourier lense (42), first fourier lense
(42) identical as the focal length of second fourier lense (44).
2. a kind of laser facula shaping optical system according to claim 1, it is characterised in that: first diaphragm (41)
In the front focus of first fourier lense (42).
3. a kind of laser facula shaping optical system according to claim 1, it is characterised in that: the beam expanding lens (3)
Enlargement ratio is two to ten times.
4. a kind of laser facula shaping optical system according to claim 1, it is characterised in that: the collimator (2) is
Reflective laser collimator.
5. a kind of laser facula shaping optical system according to claim 1, it is characterised in that: the laser (1) is
Optical fiber laser, the optical fiber (5) are single-mode polarization maintaining fiber.
6. a kind of laser facula shaping optical system according to claim 1, it is characterised in that: the pinhole diaphragm (43)
For vane type diaphragm.
7. a kind of laser facula shaping optical system according to claim 1, it is characterised in that: first diaphragm (41)
It is provided with optical beam transformation component (6) between first fourier lense (42), first diaphragm (41) and described first
Spacing between fourier lense (42) is L, L=F+(1-1/n) * d, wherein F is the focal length of first fourier lense (42)
, n is refractive index of the optical beam transformation component (6) in the case where present laser is using wavelength, and d is the optical beam transformation component (6)
Thickness.
8. a kind of laser facula shaping optical system according to claim 7, it is characterised in that: the optical beam transformation component
It (6) is Amici prism or polarizing film or wave plate.
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| CN201910314179.0A CN110146991B (en) | 2019-04-18 | 2019-04-18 | Laser spot shaping optical system |
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| CN201910314179.0A CN110146991B (en) | 2019-04-18 | 2019-04-18 | Laser spot shaping optical system |
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| CN110146991B CN110146991B (en) | 2024-07-09 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110632768A (en) * | 2019-08-30 | 2019-12-31 | 珠海达明科技有限公司 | Parallel Gaussian beam double telecentric system and alignment method |
| CN111257600A (en) * | 2020-03-04 | 2020-06-09 | 广州精点科技有限公司 | Modular laser auxiliary platform based on atomic force microscope |
| CN111337901A (en) * | 2020-04-03 | 2020-06-26 | 深圳煜炜光学科技有限公司 | Laser radar for remote detection and detection method thereof |
| CN112596253A (en) * | 2020-12-30 | 2021-04-02 | 合肥中科领谱科技有限公司 | Light beam superposition adjusting device and method |
| CN112965262A (en) * | 2021-03-23 | 2021-06-15 | 朱佳伟 | DMD-based volume imaging system and method thereof |
| CN117192516A (en) * | 2023-07-28 | 2023-12-08 | 探维科技(苏州)有限公司 | Laser radar light path adjusting method and related equipment thereof |
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