CN112540464A - Laser homogenization illumination light path and device - Google Patents
Laser homogenization illumination light path and device Download PDFInfo
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- CN112540464A CN112540464A CN201910890982.9A CN201910890982A CN112540464A CN 112540464 A CN112540464 A CN 112540464A CN 201910890982 A CN201910890982 A CN 201910890982A CN 112540464 A CN112540464 A CN 112540464A
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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
- G02B27/48—Laser speckle optics
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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
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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
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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
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Abstract
The invention relates to the technical field of laser illumination, and particularly discloses a laser homogenization illumination light path and a device; the device comprises a diffusion plate, a positive lens, a shell, a scattering sheet and a beam expander, wherein the shell is of a stepped cylindrical structure, the diameter of a first cylindrical barrel on the left side of the shell is larger, and the diameter of a second cylindrical barrel on the right side of the shell is smaller; the scattering sheet and the beam expander are sequentially arranged in the second cylinder, so that after the diameter of the laser is enlarged and the laser is collimated through the beam expander, a homogenized laser beam which is diverged according to a certain angle is formed by the scattering sheet and is incident to a positive lens arranged in the second cylinder of the shell, and the central distance between the positive lens and the scattering sheet is the focal length of the positive lens; and a diffusion plate is arranged on the left side of the positive lens and is used for homogenizing and dispersing the parallel light emitted by the positive lens. The laser homogenizing illumination light path and the device can enlarge and disperse laser beams, enable laser energy to be distributed in a flat-top manner, and can reduce and weaken speckles, thereby realizing uniform illumination of laser.
Description
Technical Field
The invention belongs to the technical field of laser illumination, and particularly relates to a laser homogenization illumination light path and a device.
Background
The laser has the advantages of good directivity, concentrated energy and the like, and is a high-brightness light source. However, since laser light has good coherence, speckle is very noticeable when illuminating; in addition, the energy of the laser light is generally gaussian distributed, resulting in uneven brightness during illumination. Speckle and illumination non-uniformity both affect illumination and viewing, are detrimental to image processing and analysis, and need to be improved to take full advantage of the laser.
Disclosure of Invention
The invention aims to provide a laser homogenizing illumination light path and a device, which can enable laser beams to be diffused, enable laser energy to be distributed in a flat-top manner, and can reduce and weaken speckles, thereby realizing uniform illumination of laser.
The technical scheme of the invention is as follows: a laser homogenization illumination light path and a device thereof comprise a diffusion plate, a positive lens, a shell, a scattering sheet and a beam expander, wherein the shell is of a stepped cylindrical structure, the diameter of a first cylindrical barrel on the left side of the shell is larger, and the diameter of a second cylindrical barrel on the right side of the shell is smaller; the scattering sheet and the beam expander are sequentially arranged in the second cylinder, so that after the diameter of the laser is enlarged and the laser is collimated through the beam expander, a homogenized laser beam which is diverged according to a certain angle is formed by the scattering sheet and is incident to a positive lens arranged in the second cylinder of the shell, and the central distance between the positive lens and the scattering sheet is the focal length of the positive lens; and a diffusion plate is arranged on the left side of the positive lens and is used for homogenizing and dispersing the parallel light emitted by the positive lens.
The scattering sheet is arranged in the second cylinder of the shell at a position close to the transition surface of the first cylinder, so that light beams emitted by the scattering sheet are not shielded.
The divergence angle a of the scattering sheet satisfies that a is more than or equal to 2arctan (d/2f), d is the clear aperture of the positive lens, and f is the back focal length of the positive lens.
The light incident end of the beam expander is also provided with an optical filter, and the optical filter is positioned at the entrance pupil of the whole device.
The inner diameter of the first cylinder is 80-100mm, and the inner diameter of the second cylinder is 25-50 mm; the light transmission apertures of the positive lens and the diffusion plate are matched with the inner diameter of the first cylindrical barrel; and the light transmission apertures of the scattering sheet and the beam expander are matched with the inner diameter of the second cylinder.
The divergence angle of the scattering sheet is 15-25 degrees.
The distance of the diffusion plate arranged on the left side of the positive lens is 3-5 mm.
The beam expanding multiplying power of the beam expanding lens is 2-5 times.
The focal length of the positive lens is 250-350 mm.
The central wavelength of the laser sheet is 532 nm.
The invention has the following remarkable effects: the laser homogenizing illumination light path and the device can enlarge and disperse laser beams, enable laser energy to be distributed in a flat-top manner, and can reduce and weaken speckles, thereby realizing uniform illumination of laser.
Drawings
FIG. 1 is a schematic structural diagram of a laser homogenized illumination light path and device according to the present invention;
in the figure: 1. a diffusion plate; 2. a positive lens; 3. a housing; 4. a scattering sheet; 5. a beam expander; 6. and (3) a filter.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
Example 1
As shown in fig. 1, a laser homogenizing illumination light path and device includes a diffusion plate 1, a positive lens 2, a housing 3, a scattering sheet 4 and a beam expander 5, wherein the housing 3 is a stepped cylindrical structure, a first cylindrical barrel on the left side has a larger diameter, for example, 100mm, and a second cylindrical barrel on the right side has a smaller diameter, for example, 20 mm; a scattering sheet 4 is fixedly arranged in a second cylinder on the right side of the shell 3 at a position close to the transition surface of the first cylinder, and the axis of the scattering sheet 4 is coincided with the central axis of the shell 3; the beam expander 5 positioned on the right side of the scattering sheet 4 is arranged at the position, close to the right side end, of the second cylinder of the shell 3, the central axis of the beam expander 5 is overlapped with the axis of the scattering sheet 4, so that laser incident from the right side of the beam expander 5 is subjected to diameter expansion and collimation through the beam expander 5, and then is incident to penetrate through the scattering sheet 4 to form homogenized laser beams dispersed according to a certain angle and is irradiated into the positive lens 2 positioned on the left side of the first cylinder of the shell 3, wherein the dispersion angle a of the scattering sheet 4 meets the condition that a is more than or equal to 2arctan (d/2f), d is the clear aperture of the positive lens 2, f is the back focal length of the positive lens, and the dispersion angle of the scattering sheet 4 is 20; the distance between the positive lens 2 and the diffusion sheet 4 is f, for example, the focal length f is 300mm, and the positive lens can converge divergent light beams of the diffusion sheet 4 to form parallel light beams; the diffusion plate 1 positioned on the left side of the positive lens 2 is arranged at the port on the left side of the first cylinder of the shell 3, the diffusion plate 1 is used for homogenizing and diffusing the parallel light beams of the positive lens 2 for illumination, the light-passing aperture of the diffusion plate 1 is 100mm, and the distance between the diffusion plate 1 and the positive lens 2 is 4 mm; an optical filter 6 is fixedly installed at a port at the right end of a second cylindrical barrel of the shell 3, the optical filter 6 is positioned at the right side of the beam expander 5 and is positioned at an entrance pupil of the whole device, the central wavelength of the light transmitted by the optical filter 6 is 532nm, and the aperture of the transmitted light is 20 mm; the beam expanding magnification of the beam expanding lens 5 is 3 times.
Example 2
As shown in fig. 1, a laser homogenization illumination light path and device includes a diffusion plate 1, a positive lens 2, a housing 3, a scattering sheet 4 and a beam expander 5, wherein the housing 3 is a stepped cylindrical structure, a first cylindrical barrel on the left side has a larger diameter, for example, 80mm, and a second cylindrical barrel on the right side has a smaller diameter, for example, 15 mm; a scattering sheet 4 is fixedly arranged in a second cylinder on the right side of the shell 3 at a position close to the transition surface of the first cylinder, and the axis of the scattering sheet 4 is coincided with the central axis of the shell 3; the beam expander 5 positioned on the right side of the scattering sheet 4 is arranged at the position, close to the right side end, of the second cylinder of the shell 3, the central axis of the beam expander 5 is overlapped with the axis of the scattering sheet 4, so that laser incident from the right side of the beam expander 5 is subjected to diameter expansion and collimation through the beam expander 5, and then is incident to penetrate through the scattering sheet 4 to form homogenized laser beams dispersed according to a certain angle and is irradiated into the positive lens 2 positioned on the left side of the first cylinder of the shell 3, wherein the dispersion angle a of the scattering sheet 4 meets the condition that a is more than or equal to 2arctan (d/2f), d is the clear aperture of the positive lens 2, f is the back focal length of the positive lens, and the dispersion angle of the scattering sheet 4 is 25; the distance between the positive lens 2 and the diffusion sheet 4 is f, for example, the focal length f is 250mm, and the positive lens can converge divergent light beams of the diffusion sheet 4 to form parallel light beams; the diffusion plate 1 positioned on the left side of the positive lens 2 is arranged at the port on the left side of the first cylinder of the shell 3, the diffusion plate 1 is used for homogenizing and diffusing the parallel light beams of the positive lens 2 for illumination, the light-passing aperture of the diffusion plate 1 is 80mm, and the distance between the diffusion plate 1 and the positive lens 2 is 3 mm; an optical filter 6 is fixedly installed at a port at the right end of a second cylindrical barrel of the shell 3, the optical filter 6 is positioned at the right side of the beam expander 5 and is positioned at an entrance pupil of the whole device, the central wavelength of the light transmitted by the optical filter 6 is 532nm, and the aperture of the transmitted light is 15 mm; the beam expanding magnification of the beam expanding lens 5 is 2 times.
Example 3
As shown in fig. 1, a laser homogenizing illumination light path and device includes a diffusion plate 1, a positive lens 2, a housing 3, a scattering sheet 4 and a beam expander 5, wherein the housing 3 is a stepped cylindrical structure, a first cylindrical barrel on the left side has a larger diameter, for example, 150mm, and a second cylindrical barrel on the right side has a smaller diameter, for example, 30 mm; a scattering sheet 4 is fixedly arranged in a second cylinder on the right side of the shell 3 at a position close to the transition surface of the first cylinder, and the axis of the scattering sheet 4 is coincided with the central axis of the shell 3; the beam expander 5 positioned on the right side of the scattering sheet 4 is arranged at the position, close to the right side end, of the second cylinder of the shell 3, the central axis of the beam expander 5 is overlapped with the axis of the scattering sheet 4, so that laser incident from the right side of the beam expander 5 is subjected to diameter expansion and collimation through the beam expander 5, and then is incident to penetrate through the scattering sheet 4 to form homogenized laser beams dispersed according to a certain angle and is irradiated into the positive lens 2 positioned on the left side of the first cylinder of the shell 3, wherein the dispersion angle a of the scattering sheet 4 meets the condition that a is more than or equal to 2arctan (d/2f), d is the clear aperture of the positive lens 2, f is the back focal length of the positive lens, and the dispersion angle of the scattering sheet 4 is 15; the distance between the positive lens 2 and the diffusion sheet 4 is f, for example, the focal length f is 350mm, and the positive lens can converge divergent light beams of the diffusion sheet 4 to form parallel light beams; the diffusion plate 1 positioned on the left side of the positive lens 2 is arranged at the port on the left side of the first cylinder of the shell 3, the diffusion plate 1 is used for homogenizing and diffusing the parallel light beams of the positive lens 2 for illumination, the light-passing aperture of the diffusion plate 1 is 150mm, and the distance between the diffusion plate 1 and the positive lens 2 is 5 mm; an optical filter 6 is fixedly installed at a port at the right end of a second cylindrical barrel of the shell 3, the optical filter 6 is positioned at the right side of the beam expander 5 and is positioned at an entrance pupil of the whole device, the central wavelength of the light transmitted by the optical filter 6 is 532nm, and the aperture of the transmitted light is 50 mm; the beam expanding magnification of the beam expanding lens 5 is 5 times.
Claims (10)
1. A laser homogenization illumination light path and a device are characterized in that: the device comprises a diffusion plate (1), a positive lens (2), a shell (3), a scattering sheet (4) and a beam expander (5), wherein the shell (3) is of a stepped cylindrical structure, the diameter of a first cylindrical barrel on the left side of the shell is larger, and the diameter of a second cylindrical barrel on the right side of the shell is smaller; the scattering sheet (4) and the beam expander (5) are sequentially arranged in the second cylinder, so that after the diameter of the laser is enlarged and collimated through the beam expander (5), a homogenized laser beam which is diverged according to a certain angle is formed by the scattering sheet (4) and is incident to the positive lens (2) arranged in the second cylinder of the shell (3), and the central distance between the positive lens (2) and the scattering sheet is the focal length of the positive lens (2); a diffusion plate (1) is arranged on the left side of the positive lens (2) and is used for homogenizing and dispersing the parallel light emitted by the positive lens (2).
2. The laser homogenizing illumination optical path and device according to claim 1, wherein: the scattering sheet (4) is arranged in the second cylinder of the shell (3) and close to the transition surface of the first cylinder, so that light beams emitted by the scattering sheet (4) are not shielded.
3. The laser homogenizing illumination optical path and device according to claim 1, wherein: the divergence angle a of the scattering sheet (4) meets the condition that a is more than or equal to 2arctan (d/2f), d is the clear aperture of the positive lens (2), and f is the back focal length of the positive lens.
4. The laser homogenizing illumination optical path and device according to claim 1, wherein: and the light incidence end of the beam expander (5) is also provided with an optical filter (6), and the optical filter is positioned at the entrance pupil of the whole device.
5. The laser homogenizing illumination optical path and device according to claim 1, wherein: the inner diameter of the first cylinder is 80-100mm, and the inner diameter of the second cylinder is 25-50 mm; the light transmission apertures of the positive lens 2 and the diffusion plate (1) are matched with the inner diameter of the first cylindrical barrel; and the light transmission apertures of the scattering sheet (4) and the beam expander (5) are matched with the inner diameter of the second cylinder.
6. The laser homogenizing illumination optical path and device according to claim 1 or 3, wherein: the divergence angle of the scattering sheet is 15-25 degrees.
7. The laser homogenizing illumination optical path and device according to claim 1, wherein: the diffusion plate (1) is arranged on the left side of the positive lens (2) and the distance is 3-5 mm.
8. The laser homogenizing illumination optical path and device according to claim 1, wherein: the beam expanding multiplying power of the beam expanding lens (5) is 2-5 times.
9. The laser homogenizing illumination optical path and device according to claim 1, wherein: the focal length of the positive lens (2) is 250-350 mm.
10. The laser homogenizing illumination optical path and device according to claim 4, wherein: the transmission center wavelength of the laser sheet (6) is 532 nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910890982.9A CN112540464A (en) | 2019-09-20 | 2019-09-20 | Laser homogenization illumination light path and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910890982.9A CN112540464A (en) | 2019-09-20 | 2019-09-20 | Laser homogenization illumination light path and device |
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| CN112540464A true CN112540464A (en) | 2021-03-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114216100A (en) * | 2021-11-19 | 2022-03-22 | 广州旭福光电科技有限公司 | Transmission type laser lighting module, light homogenizing method and application |
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- 2019-09-20 CN CN201910890982.9A patent/CN112540464A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114216100A (en) * | 2021-11-19 | 2022-03-22 | 广州旭福光电科技有限公司 | Transmission type laser lighting module, light homogenizing method and application |
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