CN116107096A - Device and method for generating vector, scalar vortex and vector vortex light beams - Google Patents
Device and method for generating vector, scalar vortex and vector vortex light beams Download PDFInfo
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- G—PHYSICS
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- 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
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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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
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
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- G—PHYSICS
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- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
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- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
- G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
- G03H1/04—Processes or apparatus for producing holograms
- G03H1/0402—Recording geometries or arrangements
Abstract
The invention relates to a device and a method for generating vector, scalar vortex and vector vortex light beams, wherein the device comprises: the polarization beam splitter prism is used for dividing laser generated by the laser source into signal light and reference light; the adjusting system comprises a first half wave plate, a second polaroid, a fan-shaped slit, a first rotating device, a second rotating device and a third rotating device, and is used for adjusting the phase and the polarization state of signal light through the rotation speed ratio among the first half wave plate, the second polaroid and the fan-shaped slit to obtain a vector light beam, a scalar vortex light beam or a vector vortex light beam; a polarization-sensitive holographic recording material for recording an incident vector beam, scalar vortex beam or vector vortex beam. Vector beams, scalar vortex beams or vector vortex beams can be flexibly prepared, and meanwhile, the polarization sensitive holographic material is simple in manufacturing process and low in cost.
Description
Technical Field
The application relates to the technical field of polarization hologram technology and special light field generation, in particular to a device and a method for generating vector, scalar vortex and vector vortex light beams.
Background
Currently, there are various methods to obtain a vector beam/scalar vortex beam/vector vortex beam. For example, the laser resonant cavity can be designed to directly output a vector beam, linearly polarized light beams output by a laser are directly converted into the vector beam by adopting sub-wavelength gratings, super-surfaces, liquid crystals and other elements, and the vector beam is generated by adopting a spatial light modulator and other methods; scalar vortex beams can be generated by a mode conversion method, a hologram method, a spatial light modulator, a spiral phase plate, a super surface material and the like; the vector vortex beam can be generated by adopting a spatial light modulator, a laser resonator configuration, a q-wave plate, a spiral phase plate, an optical super-surface material and the like. Such methods suffer from various limitations such as complex optical structures, large system volumes, high cost, and complex processing techniques. And the requirements and costs for the ability to generate both of these three beams in one system are higher.
Disclosure of Invention
In view of the above problems, the present application provides a device and a method for generating vector, scalar vortex and vector vortex beams, which solve the problems of complex optical structure, large system volume, high cost, complex processing technology and the like of the existing generating vector beams, scalar vortex beams and vector vortex beams.
To achieve the above object, the present inventors provide an apparatus for generating vector, scalar vortex and vector vortex beams, comprising:
a laser light source for generating laser light;
the polarization beam splitting prism is used for dividing laser generated by the laser source into signal light and reference light;
a reference light path for conveying the reference light;
the signal light path is used for conveying the signal light;
a first polarizer and a first quarter wave plate 30 disposed on the signal light path;
the adjusting system comprises a first half wave plate, a second polaroid, a fan-shaped slit, a first rotating device, a second rotating device and a third rotating device, wherein the first half wave plate, the second polaroid and the fan-shaped slit are sequentially arranged on a signal light path, and the first rotating device is used for rotating the first half
A wave plate, a second rotating device for rotating the second polaroid, a third rotating device for rotating 35 the fan-shaped slit, and a regulating system for passing through the first rotating device, the second rotating device and the fan-shaped slit
The third rotating device adjusts the rotation speed ratio among the first half wave plate, the second polaroid and the fan-shaped slit, and adjusts the phase and the polarization state of the signal light to obtain a vector beam, a scalar vortex beam or a vector vortex beam;
polarization-sensitive holographic recording material for vectors incident on
The beam, scalar vortex beam or vector vortex beam is recorded, and the signal light and the reference light are perpendicular to each other 40 and directly incident into the polarization sensitive holographic recording material.
In some embodiments, a camera is also included for image capture of the vector beam, scalar vortex beam, and vector vortex beam of the polarization sensitive holographic recording material reconstruction;
in some embodiments, the system further comprises an image acquisition detection unit, wherein the image acquisition detection unit comprises
The light source comprises a first beam splitter prism, a second beam splitter prism, a reflector group, a third polaroid and a second quarter wave 45 sheet:
the first light splitting prism is arranged on the signal light path and is used for splitting the signal light into first signal light and detection light, and the first signal light is input into the polarization-sensitive holographic recording material after being regulated by the regulating system;
the reflecting mirror group is used for conveying detection light, and the third polaroid and the second quarter wave plate are arranged between the 50 reflecting mirror group and the second beam splitter prism;
the second beam splitter prism is arranged between the polarization-sensitive holographic recording material and the camera.
In some embodiments, a 4f imaging system is also included, the 4f imaging system disposed between the polarization-sensitive holographic recording material and the camera.
In some embodiments, the laser beam expander further comprises a beam expander system comprising a first lens disposed between the laser light source and the polarization splitting prism, the first lens for irradiating the laser light
The laser generated by the source is expanded.
In some embodiments, a spatial filter is further included and is disposed between the laser light source and the first lens, the spatial filter being configured to filter the laser light generated by the laser light source.
In some embodiments, the opening angle a of the fan-shaped slit has a value ranging from 5 degrees to more than or equal to a >0 degrees. 60 provides another technical scheme: generating vector, scalar vortex and vector vortex light beams
Method for generating vector, scalar vortex and vector vortex light beam as above, said method is applied to the device for generating vector, scalar vortex and vector vortex light beam
The method comprises the following steps:
the laser light source generates laser;
the polarization beam splitting prism splits laser generated by the laser source into reference light and signal light; the reference light path 65 conveys reference light to the polarization-sensitive holographic recording material;
the signal light path transmits the signal light to the polarization sensitive holographic recording material;
the adjusting device adjusts the rotation speed ratio among the first half wave plate, the second polaroid and the fan-shaped slit through the first rotating device, the second rotating device and the third rotating device and is matched with the first polaroid and the first quarter
The phase and the polarization state of the signal light are regulated by a wave plate to obtain a vector beam, a scalar vortex beam or a vector vortex 70 vortex beam;
the polarization-sensitive holographic recording material records an incident vector beam, scalar vortex beam, or vector vortex beam.
In some embodiments, the method further comprises the steps of:
image capturing is performed by a camera on the vector beam, scalar vortex beam, or vector 75 vortex beam reproduced by the polarization-sensitive holographic recording material.
In some embodiments, the method further comprises the steps of:
splitting the signal light out of the detection light through a first beam splitting prism;
sending the detection light into a second beam splitter prism through a third polaroid and a second quarter wave plate;
the second beam splitter prism combines the vector beam, scalar vortex beam or vector vortex 80 vortex beam reproduced by the hologram recording material with the detection light and sends the combined beams to the camera.
Compared with the prior art, the technical scheme is characterized in that when a vector beam, a scalar vortex beam or a vector vortex beam is required to be generated, laser is generated through a laser source, and beam splitting is performed through a polarization beam splitting prism
Obtaining signal light and reference light, then sending the reference light into a polarization-sensitive holographic recording material 85 material through a reference light path, and sending the signal light into the polarization-sensitive holographic recording material through a signal light path; wherein, the signal light and the parameter
The light is perpendicularly incident into the polarization sensitive holographic recording material. The signal light path is provided with a first polaroid, a first quarter wave plate and an adjusting system, the first polaroid, the first quarter wave plate, the first half wave plate, the second polaroid and the fan-shaped slit are sequentially arranged on the signal light path and pass through (the first quarter wave
The phase and polarization changes are introduced by the plates, the first half wave plate and the second polaroid, the light beam is filtered through the fan-shaped slit, the regulation and control of the phase and the polarization are realized, and simultaneously, the first half wave plate and the second rotation are rotated through the first rotation device
The device rotates the second polaroid and the third rotating device rotates the fan-shaped slit, the vector beam, the scalar vortex beam or the vector vortex beam can be generated by adjusting the rotation speed ratio among the first half-wave plate, the second polaroid and the fan-shaped slit, and finally the polarized sensitive holographic film with the capability of recording amplitude, polarization and phase information is used
The recording material serves as a recording medium for recording information passing through the fan-shaped slit in real time. Can flexibly prepare 95 vector beams, scalar vortex beams or vector vortex beams, and simultaneously the manufacturing process of polarization sensitive holographic materials
The optical device made of the material is simple and low in cost, the problems of large system volume, high preparation cost and the like existing in the conventional special light beam generation method can be solved, and meanwhile, the effect of short processing time can be achieved in the preparation process due to the response characteristic of the material.
00 the above description is merely an outline of the technical solutions of the present application, for the purpose of making the field common
The technical solution of the present application may be more clearly understood by those skilled in the art, and may be implemented according to the text of the specification and the descriptions of the drawings, and in order to make the above-mentioned objects and other objects, features and advantages of the present application more easily understood, the following description will be made with reference to the detailed description of the present application and the drawings.
Drawings
The drawings are only for purposes of illustrating the principles, implementations, applications, features, and effects of the present application and are not to be construed as limiting the application.
In the drawings of the specification:
FIG. 1 is a schematic diagram of an apparatus for generating vector, scalar vortex and vector vortex beams according to an embodiment;
FIG. 2 is another schematic diagram of an apparatus for generating vector, scalar vortex and vector vortex beams according to an embodiment;
FIG. 3 is another schematic diagram of an apparatus for generating vector, scalar vortex and vector vortex beams according to an embodiment;
FIG. 4 is another schematic diagram of an apparatus for generating vector, scalar vortex and vector vortex beams according to an embodiment;
FIG. 5 is another schematic diagram of an apparatus for generating vector, scalar vortex and vector vortex beams according to an embodiment;
fig. 6 is a schematic flow diagram of an apparatus for generating vector, scalar vortex and vector vortex beams according to an embodiment.
Reference numerals referred to in the above drawings are explained as follows:
1. a laser light source is used for generating a laser beam,
2. a polarization beam-splitting prism, which is arranged on the optical fiber,
3. the first polarizing plate is provided with a first polarizing plate,
4. a first quarter-wave plate is provided,
5. a first half-wave plate is provided,
6. a second polarizing plate having a first polarizing plate,
7. a fan-shaped slit is arranged on the inner side of the groove,
8. a polarization-sensitive holographic recording material,
9. the camera is used to detect the position of the camera,
10. a first light-splitting prism is arranged on the first light-splitting prism,
11. a third polarizing plate having a first polarizing plate,
12. a second quarter-wave plate is provided,
13. a second light-splitting prism is arranged on the first light-splitting prism,
14. a 4f imaging system, which is used for imaging,
15. the first lens is arranged to be positioned in a first plane,
16. the spatial filter is used to filter the light of the light source,
17. a second half-wave plate is provided which is arranged on the first half-wave plate,
18. a fourth polarizing plate having a first polarizing plate,
19. and a fifth polarizing plate.
Detailed Description
In order to describe the possible application scenarios, technical principles, practical embodiments, and the like of the present application in detail, the following description is made with reference to the specific embodiments and the accompanying drawings. The embodiments described herein are only used to more clearly illustrate the technical solutions of the present application, and are therefore only used as examples and are not intended to limit the scope of protection of the present application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the present application. The appearances of the phrase "in various places in the specification are not necessarily all referring to the same embodiment, nor are they particularly limited to independence or relevance from other embodiments. In principle, in the present application, as long as there is no technical contradiction or conflict, the technical features mentioned in the embodiments may be combined in any manner to form a corresponding implementable technical solution.
Unless defined otherwise, technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application pertains; the use of related terms herein is for the description of specific embodiments only and is not intended to limit the present application.
In the description of the present application, the term "and/or" is a representation for describing a logical relationship between objects, which means that there may be three relationships, e.g., a and/or B, representing: there are three cases, a, B, and both a and B. In addition, the character "/" herein generally indicates that the front-to-back associated object is an "or" logical relationship.
In this application, terms such as "first" and "second" are used merely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual number, order, or sequence of such entities or operations.
Without further limitation, the use of the terms "comprising," "including," "having," or other like terms in this application is intended to cover a non-exclusive inclusion, such that a process, method, or article of manufacture that comprises a list of elements does not include additional elements but may include other elements not expressly listed or inherent to such process, method, or article of manufacture.
As in the understanding of the "examination guideline," the expressions "greater than", "less than", "exceeding", and the like are understood to exclude the present number in this application; the expressions "above", "below", "within" and the like are understood to include this number. Furthermore, in the description of the embodiments of the present application, the meaning of "a plurality of" is two or more (including two), and similarly, the expression "a plurality of" is also to be understood as such, for example, "a plurality of groups", "a plurality of" and the like, unless specifically defined otherwise.
In the description of the embodiments of the present application, spatially relative terms such as "center," "longitudinal," "transverse," "length," "width," "thickness," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counter-clockwise," "axial," "radial," "circumferential," etc., are used herein as terms of orientation or positional relationship based on the specific embodiments or figures, and are merely for convenience of description of the specific embodiments of the present application or ease of understanding of the reader, and do not indicate or imply that the devices or components referred to must have a particular position, a particular orientation, or be configured or operated in a particular orientation, and therefore are not to be construed as limiting of the embodiments of the present application.
Unless specifically stated or limited otherwise, in the description of the embodiments of the present application, the terms "mounted," "connected," "affixed," "disposed," and the like are to be construed broadly. For example, the "connection" may be a fixed connection, a detachable connection, or an integral arrangement; the device can be mechanically connected, electrically connected and communicated; it can be directly connected or indirectly connected through an intermediate medium; which may be a communication between two elements or an interaction between two elements. The specific meanings of the above terms in the embodiments of the present application can be understood by those skilled in the art to which the present application pertains according to the specific circumstances.
Referring to fig. 1-5, an apparatus for generating vector, scalar vortex and vector vortex beams according to the present embodiment includes:
a laser light source 1, the laser light source 1 being for generating laser light;
a polarization splitting prism 2, wherein the polarization splitting prism 2 is used for splitting the laser generated by the laser light source 1 into signal light and reference light;
a reference light path for conveying the reference light;
the signal light path is used for conveying the signal light;
a first polarizer 3 and a first quarter wave plate 4, wherein the first polarizer 3 and the first quarter wave plate 4 are arranged on a signal light path;
the adjusting system comprises a first half wave plate 5, a second polarizing plate 6, a fan-shaped slit 7, a first rotating device, a second rotating device and a third rotating device, wherein the first half wave plate 5, the second polarizing plate 6 and the fan-shaped slit 7 are sequentially arranged on a signal light path, the first rotating device is used for rotating the first half wave plate 5, the second rotating device is used for rotating the second polarizing plate 6, the third rotating device is used for rotating the fan-shaped slit 7, and the adjusting system is used for adjusting the phase and the polarization state of the signal light through the rotating speed ratio among the first half wave plate 5, the second polarizing plate 6 and the fan-shaped slit 7 by the first rotating device, the second rotating device and the third rotating device to obtain a vector light beam, a scalar vortex light beam or a vector vortex light beam;
the polarization-sensitive holographic recording material 8, wherein the polarization-sensitive holographic recording material 8 is used for recording an incident vector beam, a scalar vortex beam or a vector vortex beam, and the signal light and the reference light are perpendicular to each other and directly enter the polarization-sensitive holographic recording material 8.
When a vector beam, a scalar vortex beam or a vector vortex beam is required to be generated, generating laser by a laser light source 1, carrying out beam splitting by a polarization beam splitting prism 2 to obtain signal light and reference light, then sending the reference light into a polarization-sensitive holographic recording material 8 by a reference light path, and sending the signal light into the polarization-sensitive holographic recording material 8 by the signal light path; wherein the signal light and the reference light are perpendicular to each other and enter the polarization-sensitive hologram recording material 8. The signal light path is provided with a first polaroid 3, a first quarter wave plate 4 and an adjusting system, the first polaroid 3, the first quarter wave plate 4, a first half wave plate 5, a second polaroid 6 and a sector slit 7 are sequentially arranged on the signal light path, phase and polarization changes are introduced through the first quarter wave plate 4, the first half wave plate 5 and the second polaroid 6, the light beam is filtered through the sector slit 7, the regulation and control of the phase and the polarization are realized, meanwhile, the first half wave plate 5 is rotated through a first rotating device, the second polaroid 6 is rotated through a second rotating device, the sector slit 7 is rotated through a third rotating device, vector beams, scalar vortex beams or vector vortex beams can be generated through adjusting the rotation speed ratio among the first half wave plate 5, the second polaroid 6 and the sector slit 7, and finally, information passing through the sector slit 7 is recorded in real time through a polarization sensitive holographic recording material 8 with the capability of recording amplitude, polarization and phase information as a recording medium. The method can flexibly prepare vector beams, scalar vortex beams or vector vortex beams, meanwhile, the manufacturing process of the polarization sensitive holographic material is simple, the cost is low, and an optical device manufactured by using the material can solve the problems of large system volume, high preparation cost and the like existing in the conventional special beam generation method, and meanwhile, the effect of long and short processing time can be achieved in the preparation process due to the response characteristic of the material. Moreover, the ability to combine three different types of beams simultaneously greatly reduces the volume and cost of the system.
For example, when a vector beam with the p value needs to be prepared, only the rotation speed ratio of the second polarizer 6, the first half-wave plate 5 and the fan-shaped slit 7 needs to be set as p-p/2:1; when preparing a scalar vortex beam with the topological charge number of l value, only setting the rotation speed ratio of the first half wave plate 5 to the fan-shaped slit 7 as l:2, and standing the second polaroid 6; when preparing the vector vortex light beam of topological charge number of the value and polarization order of the value p, only the rotation speed ratio of the second polaroid 6, the first half wave plate 5 and the fan-shaped slit 7 is required to be set as p (l-p)/2:1. Wherein the sign of the rotational speed indicates the rotational direction. The positive sign indicates a counter-clockwise rotation, otherwise a clockwise rotation.
Referring to fig. 2-5, in some embodiments, a camera 9 is also included, the camera 9 being used for image capture of the vector beam, scalar vortex beam, and vector vortex beam reproduced by the polarization sensitive holographic recording material 8. Wherein, the camera adopts CCD camera.
Referring to fig. 3-5, in some embodiments, the image capturing and detecting unit further includes an image capturing and detecting unit, where the image capturing and detecting unit includes a first beam splitter prism 10, a second beam splitter prism 13, a mirror group, a third polarizer 11, and a second quarter wave plate 12:
the first beam splitter prism 10 is disposed on the signal light path, and is configured to split the signal light into a first signal light and a detection light, where the first signal light is adjusted by the adjusting system and then input into the polarization-sensitive holographic recording material 8;
240 the reflecting mirror group is used for conveying detection light, and the third polaroid 11 and the second quarter wave plate 12 are arranged between the reflecting mirror group and the second beam splitter prism 13;
the second beam splitter prism 13 is arranged between the polarization-sensitive holographic recording material 8 and the camera 9.
An image acquisition and detection unit is formed by the reflector group, the first light splitting prism 10, the third polaroid 11, the second quarter wave plate 12 and the second light splitting prism 13, and is matched with the camera 9 to capture and detect the reproduced vector light beam, scalar vortex light beam and vector vortex light beam image and performance.
And a 4f imaging system 14, wherein the 4f imaging system 14 is arranged between the polarization sensitive holographic recording material 8 and the camera 9. The 4f imaging system 14 is composed of two lenses, and can improve the quality of capturing the vector beam, scalar vortex beam, and vector vortex beam by the camera 9.
Referring to fig. 4-5, in some embodiments, the beam expanding system further includes a 250 th first lens 15, where the first lens 15 is disposed between the laser light source 1 and the polarization splitting prism 2, and the first lens 15 is used to expand the laser generated by the laser light source 1. The laser light generated by the laser light source 1 can be beam-expanded and collimated by the first lens 15. The laser device further comprises a spatial filter 16, wherein the spatial filter 16 is arranged between the laser light source 1 and the first lens 15, and the spatial filter 16 is used for filtering laser generated by the laser light source 1. The laser light is removed from the wavefront deformity caused by dust or a reflecting mirror surface attached to 255 of the laser light source 1.
Referring to fig. 5, in some embodiments, a fourth polarizer 18 is further included, the fourth polarizer 18 being disposed on the reference light path. The reference light on the reference light path enters the polarization-sensitive hologram recording material 8 through the fourth polarizing plate 18.
In some embodiments, the laser source 1 employs a fundamental mode TEM00 green laser 260 having a wavelength of 532 nm.
In some embodiments, the fan-shaped slit 7 is made of a coated aluminum alloy material. The coated aluminum alloy material has the characteristics of difficult deformation and difficult light transmission.
In some embodiments, the opening angle a of the fan-shaped slit 7 has a value ranging from: the angle of the light source is more than or equal to a and is more than 0 degrees;
the smaller the opening angle of the fan-shaped slit 7, the smoother the variation in the phase and polarization plane of the obtained special beam, and the higher the 265 accuracy.
Referring to fig. 4-5, in some embodiments, a second half-wave plate 17 is further disposed between the laser light source 1 and the polarization beam splitter prism 2, and the laser light generated by the laser light source 1 enters the polarization beam splitter prism 2 after passing through the second half-wave plate 17.
In some embodiments, the polarization-sensitive holographic recording material 8 is made of a polarization-sensitive material PQ/PMMA,270 polarization-sensitive material PQ/PMMA made of Phenanthrenequinone (PQ), 2-Azobisisobutyronitrile (AIBN), and Methyl Methacrylate (MMA) materials.
Referring to fig. 5, in some embodiments, a fifth polarizer 19 is further included, the fifth polarizer 19 being disposed between the polarization-sensitive holographic recording material 8 and the camera 9. The vector beam, scalar vortex beam or vector vortex beam reproduced by the polarization sensitive holographic recording material 8 passes through the fifth polarizer 19 and then enters the 275 camera 9, so as to achieve the purpose of detecting the polarization state distribution.
The vector beam/scalar vortex beam/vector vortex beam is recorded into the polarization sensitive material PQ/PMMA by a real-time recording system designed by only adopting common components by adopting the polarization sensitive material PQ/PMMA as a medium for generating the light beams. In the preparation process, the vector/topological charge number of any polarization order and the 280 vector vortex light beams of the polarization order can be generated by changing the parameters of some common components, and the three different light beams can be generated in one device, so that the volume and the cost of the system are greatly reduced. The specific recorded light beam attribute can be realized according to the parameters of part of devices in the control device. The polarization sensitive material PQ/PMMA with specific light beam can be used as a device, and has the advantages of small size, low cost, long processing time and the like.
Referring to fig. 6, in another embodiment, a method 285 of generating a vector, scalar vortex and vector vortex beam is applied to an apparatus for generating a vector, scalar vortex and vector vortex beam as described above, and the method comprises the steps of:
step S610: the laser light source generates laser;
step S620: the polarization beam splitting prism splits laser generated by the laser source into reference light and signal light;
step S630: the reference light path transmits reference light to the polarization-sensitive holographic recording material; 290 step S640: the signal light path transmits the signal light to the polarization sensitive holographic recording material;
step S650: the adjusting device adjusts the rotation speed ratio among the first half wave plate, the second polaroid and the fan-shaped slit through the first rotating device, the second rotating device and the third rotating device, and adjusts the phase and the polarization state of the signal light by matching with the first polaroid and the first quarter wave plate to obtain a vector light beam, a scalar vortex light beam or a vector vortex light beam;
295 step S660: the polarization-sensitive holographic recording material records an incident vector beam, scalar vortex beam, or vector vortex beam.
When a vector beam, a scalar vortex beam or a vector vortex beam is required to be generated, generating laser through a laser light source, carrying out beam splitting through a polarization beam splitting prism to obtain signal light and reference light, then sending the reference light into a polarization sensitive holographic recording material through a reference light path, and sending the signal light into a polarization 300 vibration sensitive holographic recording material through the signal light path; wherein, the signal light and the reference light are perpendicular to each other and enter the polarization sensitive holographic recording material. The signal light path is provided with a first polaroid, a first quarter wave plate and an adjusting system, the first polaroid, the first quarter wave plate, the first half wave plate, the second polaroid and the fan-shaped slit are sequentially arranged on the signal light path, phase and polarization changes are introduced through the first quarter wave plate, the first half wave plate and the second polaroid, light beams are filtered through the fan-shaped slit, the regulation and control of the phase and the polarization are realized, meanwhile, the first half wave plate is rotated by a first rotating device, the second polaroid and the fan-shaped slit is rotated by a second rotating device, the fan-shaped slit is rotated by a third rotating device, vector light beams, scalar vortex light beams or vector vortex light beams can be generated by adjusting the rotation speed ratio among the first half wave plate, the second polaroid and the fan-shaped slit, and finally information passing through the fan-shaped slit is recorded in real time by using a polarization sensitive holographic recording material with the capability of recording amplitude, polarization and phase information as recording media. The method can flexibly prepare the vector beam, the scalar vortex beam or the vector vortex 310 vortex beam, simultaneously has simple manufacturing process and low cost, and an optical device manufactured by using the material can solve the problems of large system volume, high preparation cost and the like existing in the prior special beam generation method, and can achieve the effect of long and short processing time in the preparation process due to the response characteristic of the material. Moreover, the ability to combine three different types of beams simultaneously greatly reduces the volume and cost of the system.
For example, when a vector beam with p value needs to be prepared, only the rotation speed ratio of the second polarizer, the first half-wave plate 315 and the fan-shaped slit needs to be set as p: -p/2:1; in preparing a scalar vortex beam of topological charge number of l value,
only setting the rotation speed ratio of the first half wave plate to the fan-shaped slit as l 2, and standing the second polaroid;
when preparing the vector vortex light beam of topological charge number of the value and polarization order of the value p, only the rotation speed ratio of the second polaroid, the first half wave plate and the fan-shaped slit is set to be p (l-p)/2:1. Wherein the sign of the rotational speed indicates the rotational direction. The positive sign indicates a counter-clockwise rotation, otherwise a clockwise rotation.
320 in some embodiments, further comprising the steps of:
the vector beam, the scalar vortex beam, or the vector vortex beam reproduced by the polarization-sensitive hologram recording material is image-captured by a camera.
In some embodiments, the method further comprises the steps of:
splitting the signal light out of the detection light through a first beam splitting prism;
325, sending the detection light into the second beam splitter prism through the third polarizer and the second quarter wave plate;
the second beam splitter prism combines the vector beam, scalar vortex beam or vector vortex beam reproduced by the polarization sensitive holographic recording material with the detection light and sends the combined beam to the camera.
The image acquisition and detection unit is formed by the reflector group, the first beam splitter prism, the third polaroid, the second quarter wave plate and the second beam splitter prism, and is matched with a camera to capture and detect the reproduced 330 vector light beams, scalar vortex light beams and vector vortex light beams.
Finally, it should be noted that, although the foregoing embodiments have been described in the text and the accompanying drawings of the present application, the scope of the patent protection of the present application is not limited thereby. All technical solutions that are produced by replacing or modifying the equivalent structure 335 or equivalent flow by the content recorded in the text and the drawings of the specification of the application based on the essential idea of the application, and implementing the technical solutions of the above embodiments directly or indirectly in other relevant technical fields are included in the patent protection scope of the application.
Claims (10)
1. An apparatus for generating a vector, scalar vortex and vector vortex beam, comprising:
a laser light source for generating laser light;
the polarization beam splitting prism is used for dividing laser generated by the laser source into signal light and reference light;
a reference light path for conveying the reference light;
the signal light path is used for conveying the signal light;
the first polaroid and the first quarter wave plate are arranged on the signal light path;
the adjusting system comprises a first half wave plate, a second polaroid, a fan-shaped slit, a first rotating device, a second rotating device and a third rotating device, wherein the first half wave plate, the second polaroid and the fan-shaped slit are sequentially arranged on a signal light path, the first rotating device is used for rotating the first half wave plate, the second rotating device is used for rotating the second polaroid, the third rotating device is used for rotating the fan-shaped slit, and the adjusting system is used for adjusting the phase and the polarization state of the signal light through the rotation speed ratio among the first half wave plate, the second polaroid and the fan-shaped slit by the first rotating device, the second rotating device and the third rotating device to obtain a vector light beam, a scalar vortex light beam or a vector vortex light beam;
the polarization-sensitive holographic recording material is used for recording the incident vector light beam, scalar vortex light beam or vector vortex light beam, and the signal light and the reference light are perpendicular to each other and enter the polarization-sensitive holographic recording material.
2. The apparatus for generating vector, scalar vortex and vector vortex beams according to claim 1, further comprising a camera for image capturing of the vector beam, scalar vortex beam and vector vortex beam reproduced by the polarization sensitive holographic recording material.
3. The apparatus for generating vector, scalar vortex and vector vortex beams according to claim 2, further comprising an image acquisition detection unit comprising a first beam splitting prism, a second beam splitting prism, a mirror group, a third polarizer and a second quarter wave plate:
the first light splitting prism is arranged on the signal light path and is used for splitting the signal light into first signal light and detection light, and the first signal light is input into the polarization-sensitive holographic recording material after being regulated by the regulating system;
the reflecting mirror group is used for conveying detection light, and the third polaroid and the second quarter wave plate are arranged between the reflecting mirror group and the second beam splitting prism;
the second beam splitter prism is arranged between the polarization-sensitive holographic recording material and the camera.
4. The apparatus for generating vector, scalar vortex and vector vortex beams according to claim 2, further comprising a 4f imaging system, the 4f imaging system disposed between the polarization sensitive holographic recording material and the camera.
5. The apparatus for generating a vector, scalar vortex and vector vortex beam according to claim 1 further comprising a beam expanding system comprising a first lens disposed between the laser source and the polarizing beam splitting prism, the first lens configured to expand the laser generated by the laser source.
6. The apparatus for generating a vector, scalar vortex and vector vortex beam according to claim 5 further comprising a spatial filter disposed between the laser source and the first lens, the spatial filter configured to filter laser light generated by the laser source.
7. The apparatus for generating a vector, scalar vortex and vector vortex beam according to claim 1 wherein the opening angle a of the fan-shaped slit has a value in the range of 5 ° or more a >0 °.
8. A method of generating a vector, scalar vortex and vector vortex beam, applied to an apparatus for generating a vector, scalar vortex and vector vortex beam as claimed in any one of claims 1 to 7, the method comprising the steps of:
the laser light source generates laser;
the polarization beam splitting prism splits laser generated by the laser source into reference light and signal light;
the reference light path transmits reference light to the polarization-sensitive holographic recording material;
the signal light path transmits the signal light to the polarization sensitive holographic recording material;
the adjusting device adjusts the rotation speed ratio among the first half wave plate, the first polaroid and the fan-shaped slit through the first rotating device, the second rotating device and the third rotating device, and adjusts the phase and the polarization state of the signal light by matching with the first polaroid and the first quarter wave plate to obtain a vector light beam, a scalar vortex light beam or a vector vortex light beam;
the polarization-sensitive holographic recording material records an incident vector beam, scalar vortex beam, or vector vortex beam.
9. The method of generating vector, scalar vortex and vector vortex beams according to claim 8, further comprising the steps of:
the vector beam, the scalar vortex beam, or the vector vortex beam reproduced by the polarization-sensitive hologram recording material is image-captured by a camera.
10. The method of generating vector, scalar vortex and vector vortex beams according to claim 9, further comprising the steps of:
splitting the signal light out of the detection light through a first beam splitting prism;
sending the detection light into a second beam splitter prism through a second polaroid and a second quarter wave plate;
the second beam splitter prism combines the vector beam, scalar vortex beam or vector vortex beam reproduced by the polarization sensitive holographic recording material with the detection light and sends the combined beam to the camera.
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| CN202211559100.9A CN116107096A (en) | 2022-12-06 | 2022-12-06 | Device and method for generating vector, scalar vortex and vector vortex light beams |
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| US20060176542A1 (en) * | 2003-09-05 | 2006-08-10 | Kawasaki Jukogyo Kabushiki Kaisha | Optical control device and optical control method |
| CN113835323A (en) * | 2021-08-26 | 2021-12-24 | 福建师范大学 | Dynamic exposure regulation and control system and vector light field generation device |
| CN216133257U (en) * | 2021-08-26 | 2022-03-25 | 福建师范大学 | Vector light field generating device based on polarization holographic technology |
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| US20060176542A1 (en) * | 2003-09-05 | 2006-08-10 | Kawasaki Jukogyo Kabushiki Kaisha | Optical control device and optical control method |
| CN113835323A (en) * | 2021-08-26 | 2021-12-24 | 福建师范大学 | Dynamic exposure regulation and control system and vector light field generation device |
| CN216133257U (en) * | 2021-08-26 | 2022-03-25 | 福建师范大学 | Vector light field generating device based on polarization holographic technology |
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| SHUJUN ZHENG: "Scalar vortex beam produced through faithful reconstruction of polarization holography", OPTICAL EXPRESS, vol. 29, no. 26, 20 December 2021 (2021-12-20), pages 2 * |
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