CN112254811A - Optical system for rapidly detecting vortex light beam topological charge number by utilizing triangular annular mask - Google Patents
Optical system for rapidly detecting vortex light beam topological charge number by utilizing triangular annular mask Download PDFInfo
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- CN112254811A CN112254811A CN202011107991.5A CN202011107991A CN112254811A CN 112254811 A CN112254811 A CN 112254811A CN 202011107991 A CN202011107991 A CN 202011107991A CN 112254811 A CN112254811 A CN 112254811A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/42—Photometry, e.g. photographic exposure meter using electric radiation detectors
- G01J1/4257—Photometry, e.g. photographic exposure meter using electric radiation detectors applied to monitoring the characteristics of a beam, e.g. laser beam, headlamp beam
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J1/00—Photometry, e.g. photographic exposure meter
- G01J1/02—Details
- G01J1/04—Optical or mechanical part supplementary adjustable parts
- G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
- G01J1/0437—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings using masks, aperture plates, spatial light modulators, spatial filters, e.g. reflective filters
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Abstract
An optical system for rapidly detecting vortex light beam topological charge number by utilizing a triangular annular mask comprises a light source to be detected, the triangular annular mask and an image sensor. When the vortex light beam to be detected is vertically incident to the surface of the mask plate carrying the triangular ring, a new diffraction light field is formed and is transmitted forwards, and finally the light field is emitted to the image sensor. By observing the diffraction pattern, the number of topological charges l and the number of bright spots N on each side of the triangle in the diffraction pattern are present: the unknown topological charge value of the vortex light beam can be obtained through light intensity distribution, and a new way is realized for rapidly detecting the vortex light beam. The invention has important application value in the fields of vortex light beam topological charge detection, light beam shaping, micro particle manipulation, modern optical communication and the like.
Description
Technical Field
The invention relates to the technical field of vortex light beams and diffraction optics.
Background
The vortex beam has a continuous helical phase exp (il θ) (l is the topological charge number, θ is the azimuth angle), there is a phase singularity, the central intensity is zero, and each photon carries
Orbital angular momentum of (
Planck constant). The unique phase distribution enables the vortex light beam to have potential application values in the fields of quantum information processing, particle confinement, manipulation and the like, and has wide application prospects in the aspects of information transmission and information encoding in optical communication.
The intensity function of the vortex beam has a helical phase factor e dependent on the azimuth angle theta±ilθ(l is the number of topological charges, where l is generally any integer). The method has the advantages that due to the uncertain relation between the topological load number l and the azimuth angle theta, l can be any numerical value, the channel flux of a communication system can be enlarged, the transmission rate is improved, meanwhile, the system confidentiality is enhanced, and a means is provided for solving new requirements and problems in the modern communication system.
The existing detection device for the topological charge number of the vortex light beam adopts an axicon, an array diaphragm and an image processing method, wherein the image processing method adopts an annulus Fourier transform method, the topological charge number of the vortex light beam applied by the image recognition technology is measured, the annulus Fourier transform method is further processed, a machine recognition method is adopted, the topological charge number of the vortex light beam is directly calculated, and a new algorithm is designed according to the particularity of the image. The method is too complicated and complex, and compared with the method, the topological charge number of the vortex light beam to be measured cannot be obtained quickly and accurately.
Disclosure of Invention
The invention aims to provide an optical system for rapidly detecting the topological charge number of a vortex beam, which obtains a diffraction pattern by utilizing a light field diffraction principle and rapidly judges the topological charge number through the diffraction pattern. Meanwhile, the detection system is simple and rapid, and the detection operation difficulty is reduced.
In order to achieve the purpose, the technical scheme adopted by the invention is an optical system for rapidly detecting the topological charge number of a vortex light beam by using a mask, and the system consists of a light source to be detected, a triangular annular mask and an image sensor.
When an incident vortex beam vertically enters the surface of the triangular annular mask plate, a new diffraction light field is formed and is transmitted to the image sensor, and the topological charge number can be obtained according to the diffraction pattern of the new diffraction light field.
The vortex light beam topological charge number rapid detection system is characterized in that a vortex light beam to be detected and a triangular annular mask are used for diffraction, and a topological charge number value is rapidly obtained according to the characteristics of diffraction patterns. The outer ring of the selected triangular ring is a regular triangle with side length a, the inner ring of the selected triangular ring is a regular triangle with side length b (b is less than a), wherein the size of the triangular ring is limited, the aperture cannot be too large according to the setting of the size of the waist spot of the incident vortex light beam, on the other hand, the aperture meets the requirement that the size of diffraction effect is in the millimeter order, otherwise, the aperture is too small and is limited by the processing precision.
The vortex light beam topological charge number rapid detection system is characterized in that the existence of the topological charge number l and the number of bright spots N on each side of a triangle in a diffraction pattern can be deduced according to the diffraction pattern:
l＝N-1
from this, we derive the topological charge of the incident vortex beam according to the above equation.
The vortex light beam topological charge number rapid detection system is characterized in that a mask plate consists of two parts, namely a substrate and a shading layer. The substrate is made of quartz glass or other light-transmitting materials, the shading layer is made of metal material layers or other light-proof materials, the shading layer is covered on the substrate, and a required light-transmitting triangular ring is processed on the surface of the shading layer by adopting a laser engraving method or other physical means.
The invention has the advantages and positive effects that:
the invention provides an optical detection system for rapidly detecting vortex light beam topological charge number, which is different from other complex detection devices, and when vortex light passes through the surface of a triangular annular mask, the topological charge number can be obtained according to a diffraction pattern received by an image sensor.
Drawings
FIG. 1 is a schematic diagram of an optical system for rapidly detecting vortex beam topological charge number by using a triangular ring mask plate according to the present invention, wherein (a) is a structural diagram of the whole system device, and (b) is a structural diagram of the mask plate carrying the triangular ring mask plate.
FIG. 2 is a diffraction pattern obtained after a vortex beam is incident on the detection system.
Example 1
As shown in fig. 1(a), a detection system is sequentially built, and a mask shown in fig. 1(b) is selected, wherein the outer ring of the triangular ring is set to be a regular triangle with the side length of 3mm, and the inner ring of the triangular ring is set to be a regular triangle with the side length of 1 mm. In this example, the distance between the mask and the image sensor is set to 1000 mm.
Arbitrarily selecting one vortex light to be incident into the system, changing the topological charge value of the vortex light and then sequentially incident to obtain a diffraction pattern, as shown in figure 2. The outgoing light field after being masked is calculated by an incident vortex light field through a Fraunhofer diffraction integral formula, wherein the related Fraunhofer diffraction integral formula is as follows:
wherein z is the propagation distance; k is the wave vector; λ is the operating wavelength; u (x)0，y0) Is the incident light field distribution when z is 0; u (x, y, z) is the diffraction field distribution; t (x)0，y0) The transmittance of the mask is shown.
FIGS. 2(a) - (f) are diffraction patterns obtained after a vortex beam is perpendicularly incident on the detection system. Wherein the topological charge number is 1, 2, 3, 4, 5 and 6 in sequence. The number of bright spots N on each side of the triangle in the observed diffraction pattern is directly related to the topological charge number l: when the topological charge number l is 1, the number of the bright spots is 2; when the topological charge number l is 2, the number of the bright spots is 3; when the topological charge number l is 3, the number of the bright spots is 4; when the topological charge number l is 4, the number of the bright spots is 5; when the topological load number l is 5, the number of the bright spots is 6; when the topological load number l is 6, the number of the bright spots is 7; therefore, the existence of the topological charge number l and the bright spot number N on each side of the triangle in the diffraction pattern can be obtained according to the analysis result:
l＝N-1 (2)
Claims (4)
1. an optical system for rapidly detecting the topological charge number of a vortex light beam by using a triangular annular mask is characterized by being capable of rapidly detecting the topological charge number of the vortex light beam and consisting of a light source to be detected, the triangular annular mask and an image sensor.
When an incident vortex beam vertically enters the surface of the triangular annular mask plate, a new diffraction light field is formed and is transmitted to the image sensor, and the topological charge number can be obtained according to the diffraction pattern of the new diffraction light field.
2. The optical system for rapidly detecting the topological charge number of the vortex light beam by using the triangular annular mask as claimed in claim 1, wherein the outer ring of the selected triangular ring is a regular triangle with side length a, and the inner ring of the selected triangular ring is a regular triangle with side length b (b < a), wherein the size of the triangular ring is limited, the aperture cannot be too large according to the setting of the size of the waist spot of the incident vortex light beam, on the other hand, the aperture can meet the requirement that the diffraction effect is generated, and the aperture is in millimeter order, otherwise, the aperture is too small and is limited by the processing precision.
3. The optical system for rapidly detecting the topological charge number of the vortex beam by using the triangular ring mask as claimed in claim 1, wherein the existence of the topological charge number l and the number of bright spots N on each side of a triangle in the diffraction pattern can be deduced according to the diffraction pattern:
l＝N-1
according to the formula, the topological charge number of the incident vortex light beam can be rapidly obtained.
4. The optical system for rapidly detecting the topological charge number of a vortex beam by using the triangular ring-shaped mask as claimed in claim 1, wherein the mask is composed of two parts, namely a substrate and a light shielding layer. The substrate is made of quartz glass or other light-transmitting materials, the shading layer is made of metal material layers or other light-proof materials, the shading layer is covered on the substrate, and a required light-transmitting triangular ring is processed on the surface of the shading layer by adopting a laser engraving method or other physical means.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113783613A (en) * | 2021-10-07 | 2021-12-10 | 苏州科技大学 | Vortex light orbit angular momentum detection method based on soft-edge small hole |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103969941A (en) * | 2014-05-26 | 2014-08-06 | 苏州大学 | Mask as well as preparation method and graphing method thereof |
| CN105444896A (en) * | 2015-11-30 | 2016-03-30 | 河南科技大学 | Vortex light beam topology charge measuring method based on hexagram hole diffraction |
| CN107894288A (en) * | 2017-06-21 | 2018-04-10 | 苏州大学 | The measuring method and system of vortex beams topological charge under the conditions of partially coherent light |
| CN109029745A (en) * | 2018-08-24 | 2018-12-18 | 深圳大学 | Ears circle diffraction diaphragm and vortex light topological charge number detection system and detection method |
| CN110487395A (en) * | 2019-09-26 | 2019-11-22 | 合肥工业大学 | Acoustics vortex field detector based on Fraunhofer diffraction principle |
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- 2020-10-16 CN CN202011107991.5A patent/CN112254811A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103969941A (en) * | 2014-05-26 | 2014-08-06 | 苏州大学 | Mask as well as preparation method and graphing method thereof |
| CN105444896A (en) * | 2015-11-30 | 2016-03-30 | 河南科技大学 | Vortex light beam topology charge measuring method based on hexagram hole diffraction |
| CN107894288A (en) * | 2017-06-21 | 2018-04-10 | 苏州大学 | The measuring method and system of vortex beams topological charge under the conditions of partially coherent light |
| CN109029745A (en) * | 2018-08-24 | 2018-12-18 | 深圳大学 | Ears circle diffraction diaphragm and vortex light topological charge number detection system and detection method |
| CN110487395A (en) * | 2019-09-26 | 2019-11-22 | 合肥工业大学 | Acoustics vortex field detector based on Fraunhofer diffraction principle |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113783613A (en) * | 2021-10-07 | 2021-12-10 | 苏州科技大学 | Vortex light orbit angular momentum detection method based on soft-edge small hole |
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Application publication date: 20210122 |