CN208752314U - A kind of laser zooming collimating and beam expanding system - Google Patents
A kind of laser zooming collimating and beam expanding system Download PDFInfo
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- CN208752314U CN208752314U CN201820997487.9U CN201820997487U CN208752314U CN 208752314 U CN208752314 U CN 208752314U CN 201820997487 U CN201820997487 U CN 201820997487U CN 208752314 U CN208752314 U CN 208752314U
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Abstract
The utility model relates to a kind of laser zooming collimating and beam expanding system, including fixed lens group, extender lens group, negative lenses；The extender lens group includes Zoom lens group and compensation lens group；The fixed lens group includes preceding fixed lens group and rear fixed lens group；The negative lens is arranged at the light source of incoming laser beam, fixed lens group, compensation lens group, Zoom lens group and preceding fixed lens group after the front of negative lens is successively equipped with；The fixed lens group is fixed setting；The compensation lens group and Zoom lens group are movable setting；The mode that is mutually shifted between the compensation lens group and Zoom lens group is nonlinear moving.It is 2 that this system, which can be realized zoom ratio,x﹣ 6x, have small in size, adjustment is easy, and the shoot laser angle of divergence is small, and spot energy distribution is uniform, expand number than continuously adjustable, without real focus point, the advantages that being suitable for high power laser.
Description
Technical field
The present invention relates to optical element, Optical System Design technical field, in particular to a kind of laser zooming collimator and extender
System.
Background technique
The beam diameter that laser issues is very tiny, usually only several to several millimeters of zero point, these characteristics of laser beam exist
Some aspects are very useful.However in some application fields in need is angle pencil of ray, such as laser hologram, at optical information
Reason, laser lighting, laser ranging etc..Such as in the application of laser interferometer, it will irradiate bigger than laser beam bore more
Then testee realizes measurement by the interference of light beam.For another example in the holographic applications of laser, it, which will be irradiated, compares laser beam
The big more holographic recording mediums of bore, to realize record and the reproduction of information.Therefore it needs to come using laser beam expanding system real
The collimator and extender of existing laser beam.
In recent years, perfect and processing technology the maturation theoretical with variable focal length optical system optical design, varifocal
The type of optical system becomes increasingly abundant, and image quality is gradually increased, and can compare favourably with focal length system is determined, therefore be widely applied to
In various Working Life fields.In this case, expand compared with other beam-expanding systems because it has due to zoom beam-expanding system
The advantage that beam ratio is adjustable makes it have very extensive application in fields such as laser interferometry, holographic, laser rangings.
But existing laser variable-focus beam-expanding system has the following disadvantages: that the volume of traditional refraction-reflection collimating and beam expanding system is big, and adjustment is tired
Difficulty, it is at high cost etc..
Summary of the invention
In view of this, can be realized zoom ratio the purpose of the present invention is to provide a kind of laser zooming collimating and beam expanding system
It is 2×-6×, have small in size, adjustment is easy, and the shoot laser angle of divergence is small, and spot energy distribution is uniform, expand number than continuously adjustable,
Without real focus point, the advantages that being suitable for high power laser.
To achieve the above object, the present invention provides a kind of laser zooming collimating and beam expanding system, including fixed lens group, expands
Lens group, negative lens；The extender lens group includes Zoom lens group and compensation lens group；The fixed lens group includes preceding solid
Fix-focus lens group and rear fixed lens group；The negative lens is arranged at the light source of incoming laser beam, the front of negative lens according to
It is secondary to be equipped with rear fixed lens group, compensation lens group, Zoom lens group and preceding fixed lens group；The fixed lens group is solid
Fixed setting；The compensation lens group and Zoom lens group are movable setting；It of the compensation lens group and Zoom lens group
Between be mutually shifted mode be nonlinear moving.
The multiplying power that expands of the system adjusts by adjusting the spacing between Zoom lens groups and compensation lens group.
The multiplying power that expands of the system adjusts by adjusting spacing between extender lens group and rear fixed lens group.
Fixed lens group includes the first concavees lens, the second concavees lens, third convex lens and the 4th convex lens after described；It is described
Compensating lens group includes the first compensation concavees lens and the second compensation concavees lens；The Zoom lens group includes the first zoom concavees lens
With the second zoom concavees lens；The preceding fixed lens group includes convex lens before convex lens and second before first.
The range for expanding multiplying power of the system is 2-6 times.
The focal length of the negative lens is f '=- 52mm, and the focal-distance tuning range of the system is 104mm-312mm.
The utility model has the advantages that
Laser zooming collimating and beam expanding system of the invention to be emitted the angle of divergence≤2.5mrad by optimizing zoom system, pancreatic system；
It expands than continuously adjustable, for transmissive system, zoom ratio is up to 2×-6×；Without real focus point, it is applicable to high power laser light
Device.
Detailed description of the invention
The invention will be further described with reference to the accompanying drawings and examples:
Fig. 1 is the structural diagram of the present invention.
Fig. 2 be laser the angle of divergence be 5mrad, visual field be 0.2864789 °, after this system at 1 km five it is multiple
The footprint figure of structure emergent ray.
If Fig. 3 is laser divergence-free angle, at 1 km, the footprint figure of the light of five multiplets outgoing.
Fig. 4 (a) -4 (e) is this system different in the case where expanding than M, bent to the wave aberration of five multiplets
Line chart.Wherein: Fig. 4 (a) is expanded than for 2 wave aberration curve graphs；Wherein Fig. 4 (b) is expanded than for 3 wave aberration curve graphs；Its
Middle Fig. 4 (c) is expanded than for 4 wave aberration curve graphs；Wherein Fig. 4 (d) is expanded than for 5 wave aberration curve graphs；Wherein Fig. 4 (e)
It is to expand than for 6 wave aberration curve graphs.
Fig. 5 is that the Zoom lens group of this system and compensation lens group are mutually shifted mode relational graph.
Specific embodiment
Laser zooming collimating and beam expanding system of the invention as shown in Figure 1:, including fixed lens group, extender lens group are born saturating
Mirror L1；The extender lens group includes Zoom lens group L4 and compensation lens group L3；The fixed lens group includes that preceding fixation is saturating
Microscope group L2 and rear fixed lens group L5；The negative lens L1 is arranged at the light source of incoming laser beam, before negative lens L1
Fang Yici is equipped with rear fixed lens group L2, compensation lens group L3, Zoom lens group L4 and preceding fixed lens group L5；It is described solid
Fix-focus lens group is fixed setting；The compensation lens group L3 and Zoom lens group L4 is movable setting；The compensation lens group
The mode that is mutually shifted between L3 and Zoom lens group L4 is nonlinear moving.
The multiplying power that expands of the system adjusts by adjusting the spacing between Zoom lens group L4 and compensation lens group L3.
The multiplying power that expands of the system adjusts by adjusting spacing between extender lens group and rear fixed lens group L2.
Fixed lens group L2 includes the first concavees lens, the second concavees lens, third convex lens and the 4th convex lens after described；Institute
Stating compensation lens group L3 includes the first compensation concavees lens and the second compensation concavees lens；The Zoom lens group L4 includes the first zoom
Concavees lens and the second zoom concavees lens；The preceding fixed lens group L5 includes convex lens before convex lens and second before first.
The range for expanding multiplying power of the system is 2-6 times.
The focal length of the negative lens is f '=- 52mm, and the focal-distance tuning range of the system is 104mm-312mm.
Varifocal optical system is that a kind of focal length can be with consecutive variations and image planes keep stablizing and image quality is protected in zooming procedure
Hold good optical system.Therefore, the variation of system focal length can only be realized by the interval between change system.Traditionally
The constituent element of focal length variations is caused to be known as Zoom lens group.But when system components are mobile, the image planes of system can also occur accordingly
Variation, therefore the stabilization in order to realize the final image planes of system can only pass through other mobile constituent elements and carry out image planes compensation.It will play
The constituent element for compensating image planes effect is known as compensating lens group.The Zoom lens group movement pattern different with compensation lens group will determine not
Same zoom mode.Under normal circumstances, system all follows following primary condition:
(1) (continuous) variation of system focal length；
(2) image planes are held essentially constant while focal length variations；
(3) relative aperture of system is held essentially constant；
(4) system imaging quality is met the requirements.
As previously mentioned, zoom system realizes (continuous) variation of focal length on the basis of system image planes are stablized, and want
System image quality is asked to be held essentially constant in entire focal range.Zoom system is during focal length variations there are two its focal lengths
Extreme value, i.e. long-focus and short focus.The focal length and ratio of focal length is known as the zoom of system when short focus position when system focal length position
Than.
M >=10, referred to as high zoom ratio, otherwise referred to as low zoom ratio.If zoom system is made of k lens, by several
What optics it is found that whole system synthesis focal length are as follows:
F '=f '1β2β3…βk
That is the synthesis focal length f ' of zoom system is the focal length f ' of first lens group1Thereafter the vertical axis amplification of each lens group
The product of rate.The variation of f ' is exactly β2β3…βkThe variation of product.
Objective with variable focal length should be in aspect of performance: high zoom ratio, object lens of large relative aperture, big visual field, close-shot away from, automatic adjust
Burnt, power zoom；Configuration aspects want small in size, light-weight；Make every effort to reach the quality for determining focal length objective lens in terms of image quality.These are wanted
The mutual shield of Seeking Truth.Therefore, according to a variety of different actual requirements, different types of varifocus objective is produced.
The specific design requirement of laser variable-focus beam-expanding system of this invention is as follows:
(1) light source characteristic of beam-expanding system:
Laser wavelength: 650nm
The incident laser angle of divergence: 5mrad
Incoming laser beam bore: 4mm
(2) the beam-expanding system technical indicator to be achieved designed:
Expand ratio: 2×-6×
The shoot laser angle of divergence :≤2.5mrad
The radiuses of the laser variable-focus beam-expanding system lens of present system, thickness, interval and lens material such as 1 and of table
Shown in table 2.
Table 1
Table 2
Fig. 5 ordinate indicates that the focal length of zoom system, pancreatic system changes, curve L4Indicate that Zoom lens group L4 is saturating relative to preceding fixation
The distance of microscope group L2, curve L3Indicate distance (unit: millimeter) of the compensation lens group L3 relative to Zoom lens group L4.Pass through this
The movement of sample can make the light beam consecutive variations of laser adjustable, complete 2×-6×It expands.
If Fig. 2 when laser the angle of divergence be 5mrad, visual field be 0.2864789 °, after system at 1 km five it is multiple
The footprint figure of structure emergent ray.It can be observed from fig. 2 that at 1 km of system of distance, maximum spot radius is
2512.2176mm the outgoing angle of divergence is 2.5mrad.If at 1 km, five multiple such as Fig. 3 laser divergence-free angle
The footprint figure of the light of structure outgoing.From figure 3, it can be seen that light maximum spot radius is only at 1 km of system of distance
20.9874mm, and light is simulated substantially all within border circular areas, illustrate that outgoing beam quality is extraordinary.
If Fig. 4 (a)-Fig. 4 (e) is different in the case where expanding than M, wherein Fig. 4 (a) is expanded than for 2 wave aberrations
Curve graph；Wherein Fig. 4 (b) is expanded than for 3 wave aberration curve graphs；Wherein Fig. 4 (c) is expanded than for 4 wave aberration curve graphs；
Wherein Fig. 4 (d) is expanded than for 5 wave aberration curve graphs；Wherein Fig. 4 (e) is expanded than for 6 wave aberration curve graphs.To Fig. 4 (a)-
The wave aberration of five multiplets is analyzed in Fig. 4 (e), it can be seen that and its peak value wave aberration is respectively less than 0.15 λ, therefore system
Image quality is good.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, referring to preferably real
Example is applied to describe the invention in detail, those skilled in the art should understand that, it can be to technical side of the invention
Case is modified or replaced equivalently, and without departing from the objective and range of technical solution of the present invention, should all be covered in the present invention
Scope of the claims in.
Claims (6)
1. a kind of laser zooming collimating and beam expanding system, including fixed lens group, extender lens group, negative lens；It is characterized by: institute
Stating extender lens group includes Zoom lens group and compensation lens group；The fixed lens group includes preceding fixed lens group and fixes afterwards
Lens group；The negative lens is arranged at the light source of incoming laser beam, fixed after the front of negative lens is successively equipped with
Lens group, compensation lens group, Zoom lens group and preceding fixed lens group；The fixed lens group is fixed setting；The compensation
Lens group and Zoom lens group are movable setting；Mode is mutually shifted between the compensation lens group and Zoom lens group
For nonlinear moving.
2. system according to claim 1, it is characterised in that: the system expands multiplying power by adjusting Zoom lens group
It is adjusted the spacing between lens group is compensated.
3. system according to claim 1, it is characterised in that: the system expands multiplying power by adjusting extender lens group
Spacing between rear fixed lens group adjusts.
4. system according to claim 2 or 3, it is characterised in that: fixed lens group includes the first concavees lens, the after described
Two concavees lens, third convex lens and the 4th convex lens；The compensation lens group includes that the first compensation concavees lens and the second compensation are recessed
Lens；The Zoom lens group includes the first zoom concavees lens and the second zoom concavees lens；The preceding fixed lens group includes the
Convex lens before convex lens and second before one.
5. system according to claim 4, it is characterised in that: the range for expanding multiplying power of the system is 2-6 times.
6. system according to claim 5, it is characterised in that: the focal length of the negative lens is f '=﹣ 52mm, the system
Focal-distance tuning range be 104mm-312mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820997487.9U CN208752314U (en) | 2018-06-26 | 2018-06-26 | A kind of laser zooming collimating and beam expanding system |
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| CN201820997487.9U CN208752314U (en) | 2018-06-26 | 2018-06-26 | A kind of laser zooming collimating and beam expanding system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110514595A (en) * | 2019-08-28 | 2019-11-29 | 中国科学院长春光学精密机械与物理研究所 | Optical measuring device with Beam Control function |
| CN110543004A (en) * | 2019-08-27 | 2019-12-06 | 杭州图谱光电科技有限公司 | Digital microscope objective with high magnification and large zoom ratio |
| CN110865464A (en) * | 2019-11-25 | 2020-03-06 | 深圳市深大极光科技有限公司 | Laser projection device |
| CN113625508A (en) * | 2021-08-18 | 2021-11-09 | 长春电子科技学院 | High-zoom-ratio illumination optical system |
| CN114221712A (en) * | 2021-12-17 | 2022-03-22 | 东华大学 | Laser wireless energy transmission system with adjustable light beam |
-
2018
- 2018-06-26 CN CN201820997487.9U patent/CN208752314U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110543004A (en) * | 2019-08-27 | 2019-12-06 | 杭州图谱光电科技有限公司 | Digital microscope objective with high magnification and large zoom ratio |
| CN110514595A (en) * | 2019-08-28 | 2019-11-29 | 中国科学院长春光学精密机械与物理研究所 | Optical measuring device with Beam Control function |
| CN110865464A (en) * | 2019-11-25 | 2020-03-06 | 深圳市深大极光科技有限公司 | Laser projection device |
| CN113625508A (en) * | 2021-08-18 | 2021-11-09 | 长春电子科技学院 | High-zoom-ratio illumination optical system |
| CN113625508B (en) * | 2021-08-18 | 2022-10-25 | 长春电子科技学院 | High-zoom-ratio illumination optical system |
| CN114221712A (en) * | 2021-12-17 | 2022-03-22 | 东华大学 | Laser wireless energy transmission system with adjustable light beam |
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