CN110161678A - Optical beam scanner and its scan method - Google Patents
Optical beam scanner and its scan method Download PDFInfo
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- CN110161678A CN110161678A CN201910314746.2A CN201910314746A CN110161678A CN 110161678 A CN110161678 A CN 110161678A CN 201910314746 A CN201910314746 A CN 201910314746A CN 110161678 A CN110161678 A CN 110161678A
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- polarization grating
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- circularly polarized
- diffraction
- polarized light
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/0808—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more diffracting elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/106—Scanning systems having diffraction gratings as scanning elements, e.g. holographic scanners
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
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Abstract
The present invention relates to light beam scanning technique field, a kind of optical beam scanner and its scan method are disclosed, the promotion of overall performance is realized with a kind of new scanning mode.Optical beam scanner of the present invention includes beam switching device and at least one level polarization grating: the beam switching device, and the circularly polarized light that the light beam for issuing light source is uniformly converted into left or right rotation is supplied to the polarization grating of adjacent level-one；Each polarization grating, the periodic arrangement by controlling material molecule realize beam diffraction and deflection；And transmitted spectrum concentrates on first-order diffraction grade, it is vector superposed with the polarization grating angle of diffraction that outgoing beam deflection angle is beam incident angle；And it is additionally provided with rotating device, for driving the corresponding single or at least two polarization grating rotations, and then the rotation of the polarization grating angle of diffraction is driven, so that emergent light at different levels rotates with corresponding polarization grating and displacement corresponding to continuous scanning occurs.
Description
Technical field
The present invention relates to light beam scanning technique field more particularly to a kind of optical beam scanner and its scan methods.
Background technique
In recent years, related light beam deflection increasingly causes the concern of all circles with scanning, is always the hot spot of present age research.Light
Beam deflection technique plays the role of very crucial in various aspects such as production, lives.Include: laser radar, swashs at laser processing
The multiple fields such as optical communication, therefore the research of light beam deviation and scanner has important practical significance.
In the prior art, the direction of light beam deviation is controlled frequently with the mode of motor rotation prism.But the technology faces
Shortcomings include that single unit system is complicated, bulky, operation difficulty is high, limited efficacy, and controllable angle range is small, at high cost
Deng.
Summary of the invention
Present invention aims at a kind of optical beam scanner and its scan method is disclosed, realized with a kind of new scanning mode whole
The promotion of body performance.
In order to achieve the above object, the present invention discloses a kind of optical beam scanner, including beam switching device and at least one level polarization
Grating:
The beam switching device, the circularly polarized light that the light beam for issuing light source is uniformly converted into left or right rotation mention
Supply the polarization grating of adjacent level-one；
Each polarization grating, the periodic arrangement by controlling material molecule realize beam diffraction and deflection；And it transmits
Spectrum concentrates on first-order diffraction grade, and it is vector superposed with the polarization grating angle of diffraction that outgoing beam deflection angle is beam incident angle；
Rotating device for driving the corresponding single or at least two polarization grating rotations, and then drives polarised light
Grid angle of diffraction rotation, so that emergent light at different levels rotates with corresponding polarization grating and displacement corresponding to continuous scanning occurs.
In order to achieve the above object, invention additionally discloses a kind of beam scanning methods, comprising:
Beam switching device and at least one level polarization grating are disposed in optical path；Each polarization grating passes through control material
The periodic arrangement of molecule realizes beam diffraction and deflection, and transmitted spectrum concentrates on first-order diffraction grade, outgoing beam deflection angle
For the vector superposed of beam incident angle and the polarization grating angle of diffraction；
The circularly polarized light that the light beam that light source issues uniformly is converted into left or right rotation is provided by the beam switching device
To the polarization grating of adjacent level-one；
The corresponding single or at least two polarization gratings rotations are driven by rotating device, and then polarization grating is driven to spread out
Firing angle rotation, so that emergent light at different levels rotates with corresponding polarization grating and displacement corresponding to continuous scanning occurs.
To sum up, optical beam scanner of the invention and its scan method, at least have it is following the utility model has the advantages that
Light beam scanning is realized based on the polarization grating for being different from traditional raster, and is matched between polarization grating and light source
Beam switching device is affixed one's name to, it is possible to prevente effectively from the unpolarized state of light source is handled and positive and negative anodes coupling caused by direct incident polarization grating
The puzzlement of two beam diffraction lights of distribution is closed, other multiorder diffractives need to be considered and need to additionally increase more complicated by also avoiding traditional raster
Multiorder diffractive processing unit and caused by inconvenience.Whereby, the present invention passes through the left or right rotation circularly polarized light of singlet
Polarization grating is deflected by specific direction, and drives polarization grating rotation to realize that light beam scans by rotating device.Structure letter
Single practical, deployment and operation are very convenient, and overall performance is obviously improved.
Below with reference to accompanying drawings, the present invention is described in further detail.
Detailed description of the invention
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
It applies example and its explanation is used to explain the present invention, do not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 is optical beam scanner circuit theory schematic diagram disclosed by the embodiments of the present invention；
Fig. 2 is polarization grating surface texture schematic diagram disclosed by the embodiments of the present invention.
Specific embodiment
The embodiment of the present invention is described in detail below in conjunction with attached drawing, but the present invention can be defined by the claims
Implement with the multitude of different ways of covering.
Embodiment 1
The present embodiment discloses a kind of optical beam scanner, including beam switching device and at least one level polarization grating.
The beam switching device, the circularly polarized light that the light beam for issuing light source is uniformly converted into left or right rotation mention
Supply the polarization grating of adjacent level-one.
Each polarization grating, the periodic arrangement by controlling material molecule realize beam diffraction and deflection；And it transmits
Spectrum concentrates on first-order diffraction grade, and it is vector superposed with the polarization grating angle of diffraction that outgoing beam deflection angle is beam incident angle.
Rotating device for driving the corresponding single or at least two polarization grating rotations, and then drives polarised light
Grid angle of diffraction rotation, so that emergent light at different levels rotates with corresponding polarization grating and displacement corresponding to continuous scanning occurs.
In other words, the quantity of the present embodiment polarization grating can be level-one, be also possible to two-stage or two-stage or more.It is at different levels inclined
Grating shake under the action of rotating device, can be independent rotation, can also link simultaneously with the polarization grating of other grades.Phase
The power drive unit answered can use stepper motor, servo motor, linear motor, magnetic suspension motor or piezoelectric drive motors
Deng.Corresponding rotating device can by with need to dispose the equal number of sub- turntables of polarization grating and carry out joint controls.
When using multistage polarization grating, on the one hand, be exaggerated the deflection angle of scanning light beam；On the other hand, it also increases
The diversity of scanning area.Such as:
When the polarization grating quantity that the present embodiment optical beam scanner uses is one, emergent light scanning area is circular cone
Face, and cone angle is 2 times of polarization grating angle of diffraction.When the quantity of polarization grating is two, emergent ray direction is
Two polarization grating angle of diffraction are vector superposed with the two Fictitious data base groove angular separation, and outgoing beam scanning area
For cone.Principle: assuming that two polarization grating Fictitious data base groove angular separations are Φ.When incident light is by first polarization
After grating, emergent light and incident light angle are the polarization grating diffraction angle1, and emergent light and incident light are in same level,
And the plane is vertical with first polarization grating Fictitious data base groove direction；When light beam second polarization grating of incidence, light beam enters
Firing angle degree can be divided into and the angle component θ in second polarization grating Fictitious data base groove direction vertical directionx=θ1* cos Φ with
And the angle component θ parallel with second polarization grating Fictitious data base groove directiony=θ1*sinΦ.By second polarised light
After grid, it is θ that angle component, which increases,1*cosΦ+θ2(θ2For second polarization grating angle of diffraction).And θyAngle remains unchanged.Finally
Exit direction θ is θxWith θyVector superposed, and θ2=(θ1*cosΦ+θ2)2+(θ1*sinΦ)2.Since it is related to three-dimensional variable,
So that scanning area extends to the level of body.
Preferably, the present embodiment polarization grating also has following characteristics: by incident Left-hand circular polarization in deflection process
Light is deflected into the right-circularly polarized light of outgoing, or incident right-circularly polarized light is deflected into the left circularly polarized light of outgoing.Into
One step, the first-order diffraction grade of the present embodiment polarization grating specifically: incident left circularly polarized light is deflected into negative one diffraction
Grade；Or incident right-circularly polarized light is deflected into a positive order of diffraction.
Optionally, the beam switching device of the present embodiment includes at least quarter wave plate, for linearly polarized photon to be converted into justifying
Polarised light.In addition, still further comprising and being placed between the light source and the quarter wave plate when light source is non-linear light source
Linear polarizer specifically can refer to attached drawing 1, wherein index serial number 1,2,3 is respectively referred to for linear polarizer, quarter wave plate and polarization
Grating.Wherein, when the beam switching device is supplied to specifically for the light beam that light source issues is converted into left circularly polarized light
When polarization grating, the quarter wave plate fast axle and the linear polarizer polarization direction are in 45 ° of angles；Or when the light beam turns
When changing device is supplied to polarization grating specifically for the light beam that light source issues is converted into right-circularly polarized light, the quarter wave plate
Fast axle and the linear polarizer polarization direction are in -45 ° of angles.Whereby, linear entrance polarisation light is changed into circle by quarter wave plate
Polarised light, using polarization grating continuous deflection to specific direction；In planar scanning area, polarized when rotating device drives
When grating rotating, beam scan region can be a circle；By setting the rotation position of two polarization gratings, may be implemented to circle
The scanning at interior any point.
Optionally, the present embodiment polarization grating optical property modified material can be made of liquid crystal, liquid crystal polymer；Its surface
Structure can refer to attached drawing 2.Alternatively, the polarization grating optical property modified material can be surpassed surface or the super surface system of medium by metal
At, wherein super surface is a kind of ultra-thin two-dimension array plane that a series of artificial micro-structure by sub-wavelengths forms, and has production
The characteristics such as relatively easy, relatively low, the small in size and thickness ultrathin of loss, may be implemented the amplitude to electromagnetic wave, phase, propagation
The Effective Regulation of mode, polarization state etc..
To sum up, optical beam scanner disclosed in the present embodiment, at least have it is following the utility model has the advantages that
Light beam scanning is realized based on the polarization grating for being different from traditional raster, and is matched between polarization grating and light source
Beam switching device is affixed one's name to, it is possible to prevente effectively from the unpolarized state of light source is handled and positive and negative anodes coupling caused by direct incident polarization grating
The puzzlement of two beam diffraction lights of distribution is closed, other multiorder diffractives need to be considered and need to additionally increase more complicated by also avoiding traditional raster
Multiorder diffractive processing unit and caused by inconvenience.Whereby, the present invention passes through the left or right rotation circularly polarized light of singlet
Polarization grating is deflected by specific direction, and drives polarization grating rotation to realize that light beam scans by rotating device.Structure letter
Single practical, deployment and operation are very convenient, and overall performance is obviously improved.
Embodiment 2
Corresponding with above-mentioned apparatus embodiment, the present embodiment discloses a kind of beam scanning method, comprising:
Step S1, beam switching device and at least one level polarization grating are disposed in optical path；Each polarization grating passes through
The periodic arrangement for controlling material molecule realizes beam diffraction and deflection, and transmitted spectrum concentrates on first-order diffraction grade, emergent light
Beam deflection angle is the vector superposed of beam incident angle and the polarization grating angle of diffraction.
Step S2, the light beam that light source issues uniformly is converted into the circular polarization of left or right rotation by the beam switching device
Light is supplied to the polarization grating of adjacent level-one.
Step S3, it drives corresponding single or at least two polarization gratings to rotate by rotating device, and then drives partially
Vibration optical grating diffraction angle rotation, so that emergent light at different levels rotates with corresponding polarization grating and displacement corresponding to continuous scanning occurs.
Preferably, the present embodiment method further include:
In deflection process, incident left circularly polarized light is deflected into the right-hand circular polarization of outgoing by the polarization grating
Light, or incident right-circularly polarized light is deflected into the left circularly polarized light of outgoing.
Preferably, the first-order diffraction grade of the present embodiment polarization grating specifically: be deflected into incident left circularly polarized light
The negative one order of diffraction；Or incident right-circularly polarized light is deflected into a positive order of diffraction.
Optionally, the present embodiment beam switching device includes at least quarter wave plate.It as needed can also be further described
Linear polarizer is set between light source and the quarter wave plate, in which: when the beam switching device is specifically used for issuing light source
Light beam when being converted into left circularly polarized light and being supplied to polarization grating, the quarter wave plate fast axle and the linear polarizer polarize
Direction is in 45 ° of angles；Or when the beam switching device is specifically used for the light beam that light source issues being converted into right-hand circular polarization
When light is supplied to polarization grating, the quarter wave plate fast axle and the linear polarizer polarization direction are in -45 ° of angles.
Optionally, the polarization grating optical property modified material is made of liquid crystal, liquid crystal polymer.Alternatively, described inclined
Vibration grating optical property modified material surpasses surface by metal or the super surface of medium is made.
Similarly, the present embodiment method also at least have it is following the utility model has the advantages that
Light beam scanning is realized based on the polarization grating for being different from traditional raster, and is matched between polarization grating and light source
Beam switching device is affixed one's name to, it is possible to prevente effectively from the unpolarized state of light source is handled and positive and negative anodes coupling caused by direct incident polarization grating
The puzzlement of two beam diffraction lights of distribution is closed, other multiorder diffractives need to be considered and need to additionally increase more complicated by also avoiding traditional raster
Multiorder diffractive processing unit and caused by inconvenience.Whereby, the present invention passes through the left or right rotation circularly polarized light of singlet
Polarization grating is deflected by specific direction, and drives polarization grating rotation to realize that light beam scans by rotating device.Structure letter
Single practical, deployment and operation are very convenient, and overall performance is obviously improved.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (12)
1. a kind of optical beam scanner, which is characterized in that including beam switching device and at least one level polarization grating:
The beam switching device, the circularly polarized light that the light beam for issuing light source is uniformly converted into left or right rotation are supplied to
The polarization grating of adjacent level-one；
Each polarization grating, the periodic arrangement by controlling material molecule realize beam diffraction and deflection；And transmitted spectrum
Concentrate on first-order diffraction grade, it is vector superposed with the polarization grating angle of diffraction that outgoing beam deflection angle is beam incident angle；
Rotating device for driving the corresponding single or at least two polarization grating rotations, and then drives polarization grating to spread out
Firing angle rotation, so that emergent light at different levels rotates with corresponding polarization grating and displacement corresponding to continuous scanning occurs.
2. optical beam scanner according to claim 1, which is characterized in that the polarization grating is also used to: in deflection process
The middle right-circularly polarized light that incident left circularly polarized light is deflected into outgoing, or incident right-circularly polarized light is deflected into out
The left circularly polarized light penetrated.
3. optical beam scanner according to claim 2, which is characterized in that the first-order diffraction grade of the polarization grating is specific
Are as follows:
Incident left circularly polarized light is deflected into the negative one order of diffraction；Or
Incident right-circularly polarized light is deflected into a positive order of diffraction.
4. optical beam scanner according to claim 1,2 or 3, which is characterized in that the beam switching device includes at least
Quarter wave plate.
5. optical beam scanner according to claim 4, which is characterized in that further include being placed in the light source and 1/4 wave
Linear polarizer between piece, and:
When the beam switching device is supplied to polarised light specifically for the light beam that light source issues is converted into left circularly polarized light
When grid, the quarter wave plate fast axle and the linear polarizer polarization direction are in 45 ° of angles；Or
When the beam switching device is supplied to polarised light specifically for the light beam that light source issues is converted into right-circularly polarized light
When grid, the quarter wave plate fast axle and the linear polarizer polarization direction are in -45 ° of angles.
6. optical beam scanner according to claim 1,2 or 3, which is characterized in that the polarization grating optical property is modified
Material is made of liquid crystal, liquid crystal polymer；Or
The polarization grating optical property modified material surpasses surface by metal or the super surface of medium is made.
7. a kind of beam scanning method characterized by comprising
Beam switching device and at least one level polarization grating are disposed in optical path；Each polarization grating passes through control material molecule
Periodic arrangement realize beam diffraction and deflection, and transmitted spectrum concentrates on first-order diffraction grade, and outgoing beam deflection angle is light
Beam incidence angle is vector superposed with the polarization grating angle of diffraction；
The circularly polarized light that the light beam that light source issues uniformly is converted into left or right rotation is supplied to phase by the beam switching device
The polarization grating of adjacent level-one；
The corresponding single or at least two polarization gratings rotations are driven by rotating device, and then drive the polarization grating angle of diffraction
Rotation, so that emergent light at different levels rotates with corresponding polarization grating and displacement corresponding to continuous scanning occurs.
8. beam scanning method according to claim 7, which is characterized in that further include:
In deflection process, incident left circularly polarized light is deflected into the right-circularly polarized light of outgoing by the polarization grating, or
Incident right-circularly polarized light is deflected into the left circularly polarized light of outgoing.
9. beam scanning method according to claim 8, which is characterized in that the first-order diffraction grade of the polarization grating is specific
Are as follows:
Incident left circularly polarized light is deflected into the negative one order of diffraction；Or
Incident right-circularly polarized light is deflected into a positive order of diffraction.
10. according to beam scanning method described in claim 7,8 or 9, which is characterized in that the beam switching device at least wraps
Include quarter wave plate.
11. beam scanning method according to claim 10, which is characterized in that further include:
Linear polarizer is set between the light source and the quarter wave plate, and:
When the beam switching device is supplied to polarised light specifically for the light beam that light source issues is converted into left circularly polarized light
When grid, the quarter wave plate fast axle and the linear polarizer polarization direction are in 45 ° of angles；Or
When the beam switching device is supplied to polarised light specifically for the light beam that light source issues is converted into right-circularly polarized light
When grid, the quarter wave plate fast axle and the linear polarizer polarization direction are in -45 ° of angles.
12. according to beam scanning method described in claim 7,8 or 9, which is characterized in that the polarization grating optical property changes
Property material is made of liquid crystal, liquid crystal polymer；Or
The polarization grating optical property modified material surpasses surface by metal or the super surface of medium is made.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910314746.2A CN110161678A (en) | 2019-04-18 | 2019-04-18 | Optical beam scanner and its scan method |
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| CN201910314746.2A CN110161678A (en) | 2019-04-18 | 2019-04-18 | Optical beam scanner and its scan method |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110928101A (en) * | 2019-12-03 | 2020-03-27 | 东南大学 | Liquid crystal polarization grating cascade device and diffraction angle adjusting and controlling method thereof |
| CN111308483A (en) * | 2019-11-28 | 2020-06-19 | 深圳市麓邦技术有限公司 | Laser ranging method and device for laser ranging |
| CN112285921A (en) * | 2020-11-17 | 2021-01-29 | 中国工程物理研究院激光聚变研究中心 | Light beam scanning method and system |
| WO2021036525A1 (en) * | 2019-08-29 | 2021-03-04 | 华为技术有限公司 | Optical combiner in augmented reality and related device |
| CN112987286A (en) * | 2021-04-21 | 2021-06-18 | 中国工程物理研究院流体物理研究所 | Light beam scanning system based on volume Bragg grating |
| CN113267789A (en) * | 2021-04-30 | 2021-08-17 | 西安工业大学 | Infrared full-waveband two-dimensional four-directional polarization modulation grating |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021036525A1 (en) * | 2019-08-29 | 2021-03-04 | 华为技术有限公司 | Optical combiner in augmented reality and related device |
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| CN112987286B (en) * | 2021-04-21 | 2021-07-20 | 中国工程物理研究院流体物理研究所 | Light beam scanning system based on volume Bragg grating |
| CN113267789A (en) * | 2021-04-30 | 2021-08-17 | 西安工业大学 | Infrared full-waveband two-dimensional four-directional polarization modulation grating |
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Application publication date: 20190823 |