CN111007671A - Device and method for generating radial high-order perfect vortex light beam - Google Patents
Device and method for generating radial high-order perfect vortex light beam Download PDFInfo
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- CN111007671A CN111007671A CN201911118954.1A CN201911118954A CN111007671A CN 111007671 A CN111007671 A CN 111007671A CN 201911118954 A CN201911118954 A CN 201911118954A CN 111007671 A CN111007671 A CN 111007671A
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Abstract
The invention discloses a device and a method for generating a radial high-order perfect vortex beam, wherein the device comprises: a laser for outputting a gaussian beam; the Glan prism is arranged behind the laser and used for carrying out polarization modulation on the Gaussian beam to generate a horizontal linear polarization Gaussian beam; the spatial light modulator is arranged behind the Glan prism and used for carrying out phase modulation on the horizontal line polarization Gaussian beam to generate a radial high-order perfect vortex beam; and the CCD camera is arranged below the spatial light modulator and is used for detecting the light intensity of the radial high-order perfect vortex light beam. According to the invention, the radial high-order perfect vortex light beam phase diagram is loaded on the spatial light modulator, and the incident light beam is modulated by using the spatial light modulator, so that the radial high-order perfect vortex light beam is finally generated.
Description
Technical Field
The invention relates to the technical field of optics, in particular to a device and a method for generating a radial high-order perfect vortex light beam.
Background
In recent years, vortex beams carrying orbital angular momentum have wide application prospects in the fields of optical communication, biomedicine and the like.
Vortex beams of different topological charge numbers carry different orbital angular momenta and are spatially orthogonal and distinguishable. Therefore, the channel capacity can be greatly expanded by orbital angular momentum multiplexing. However, the intensity radius of the vortex beam increases with the increase of the topological charge number, and the development of the vortex beam in practical application is severely limited. Especially in the field of optical communication, an excessively large intensity radius results in excessive energy loss and makes it difficult to couple vortex beams into optical fibers for signal transmission. Perfect vortex beams are of great interest due to their excellent optical properties, in which the intensity radius does not increase with increasing topological charge number, and have been used in the fields of optical communications, optical tweezers, etc. The radial high-order perfect vortex beam has multiple modes and can carry more signals and manipulate more particles. However, the generation method of the radial high-order perfect vortex beam is not researched, most of applications are based on the radial zero-order perfect vortex beam, the requirement of a complex structure light field cannot be met, and the diversity of the perfect vortex beam in practical application is seriously hindered.
Therefore, the prior art still needs to be improved and developed to address the above drawbacks.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a device and a method for generating a radial high-order perfect vortex light beam, which have the advantages of simple light path, stable light beam, high conversion rate, strong flexibility, etc., in view of the above-mentioned defects in the prior art.
The technical scheme adopted by the invention for solving the technical problem is as follows:
a generation device of a radial high-order perfect vortex beam, wherein the generation device of the radial high-order perfect vortex beam comprises:
a laser for outputting a gaussian beam;
the Glan prism is arranged behind the laser and used for carrying out polarization modulation on the Gaussian beam to generate a horizontal linear polarization Gaussian beam;
the spatial light modulator is arranged behind the Glan prism and used for carrying out phase modulation on the horizontal line polarization Gaussian beam to generate a radial high-order perfect vortex beam;
and the CCD camera is arranged below the spatial light modulator and is used for detecting the light intensity of the radial high-order perfect vortex light beam.
The device for generating the radial high-order perfect vortex beam is characterized in that the laser, the Glan prism and the spatial light modulator are arranged on the same optical axis.
The device for generating the radial high-order perfect vortex light beam is characterized in that the spatial light modulator and the CCD camera are arranged on the same optical axis.
The device for generating the radial high-order perfect vortex beam is characterized in that the wavelength of the laser is 1550 nm.
The generation device of the radial high-order perfect vortex beam is characterized in that the optical axis direction of the Glan prism is 0 degree.
The device for generating the radial high-order perfect vortex beam is characterized in that the spatial light modulator is also used for loading a radial high-order perfect vortex beam phase diagram.
A generation method of a radial high-order perfect vortex beam based on the generation device of the radial high-order perfect vortex beam comprises the following steps:
step A, a Gaussian beam output by the laser passes through the Glan prism to generate a horizontal linear polarization Gaussian beam;
and B, after the horizontal line polarization Gaussian beam passes through the spatial light modulator loaded with the radial high-order perfect vortex beam phase diagram, generating a radial high-order perfect vortex beam, and carrying out light intensity detection on the radial high-order perfect vortex beam through the CCD camera.
The method for generating the radial high-order perfect vortex beam comprises the step of outputting a 1550nm Gaussian beam by the laser.
The method for generating the radial high-order perfect vortex beam comprises the step that a laser outputs a 1550nm Gaussian beam to pass through the Glan prism with the optical axis direction of 0 degree, and the horizontally linear polarized Gaussian beam is generated.
The method for generating the radial high-order perfect vortex beam comprises the step of obtaining a radial high-order perfect vortex beam phase diagram by superposing a Bessel vortex phase, a grating phase and a convex lens phase.
Has the advantages that: the invention provides a device and a method for generating a radial high-order perfect vortex light beam, wherein the device comprises: a laser for outputting a gaussian beam; the Glan prism is arranged behind the laser and used for carrying out polarization modulation on the Gaussian beam to generate a horizontal linear polarization Gaussian beam; the spatial light modulator is arranged behind the Glan prism and used for carrying out phase modulation on the horizontal line polarization Gaussian beam to generate a radial high-order perfect vortex beam; and the CCD camera is arranged below the spatial light modulator and is used for detecting the light intensity of the radial high-order perfect vortex light beam. According to the invention, the radial high-order perfect vortex light beam phase diagram is loaded on the spatial light modulator, and the incident light beam is modulated by using the spatial light modulator, so that the radial high-order perfect vortex light beam is finally generated.
Drawings
FIG. 1 is a schematic structural diagram of a preferred embodiment of the device for generating a radial high-order perfect vortex beam according to the present invention.
FIG. 2 is a flow chart of a preferred embodiment of the method of generating a radial high order perfect vortex beam of the present invention;
FIG. 3 is a schematic diagram of the generation process of the radial high-order perfect vortex beam phase map in the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a preferred embodiment of a device for generating a radial high-order perfect vortex beam according to the present invention.
As shown in fig. 1, an embodiment of the present invention provides a device for generating a radial high-order perfect vortex beam, where the device for generating a radial high-order perfect vortex beam includes:
a laser 1 for outputting a gaussian beam;
the Glan prism 2 is arranged behind the laser 1 and used for carrying out polarization modulation on the Gaussian beam and generating a horizontal linear polarization Gaussian beam;
the spatial light modulator 3 is arranged behind the Glan prism 2 and used for carrying out phase modulation on the horizontally polarized Gaussian beam to generate a radial high-order perfect vortex beam;
and the CCD camera 4 is arranged below the spatial light modulator 3 and is used for detecting the light intensity of the radial high-order perfect vortex light beams.
Wherein the laser 1, the glan prism 2 and the spatial light modulator 3 are arranged on the same optical axis; the spatial light modulator 3 and the CCD camera 4 are disposed on the same optical axis.
Specifically, the laser 1 is a laser with a wavelength of 1550nm, the optical axis direction of the glan prism 2 is 0 °, the glan prism is a birefringent polarizing device made of natural calcite crystal, and a beam of unpolarized light is input to obtain a beam of linearly polarized light (e-light), which has higher transmittance and polarization purity compared with other polarizing plates (such as polarizing plates).
Before generating a radial high-order perfect vortex beam by the spatial light modulator 3, the spatial light modulator 3 is loaded with a radial high-order perfect vortex beam phase map.
Further, based on the device for generating a radial high-order perfect vortex beam provided by the above embodiment, the present invention further provides a method for generating a radial high-order perfect vortex beam, please refer to fig. 2, and fig. 2 is a flowchart of a preferred embodiment of the method for generating a radial high-order perfect vortex beam according to the present invention.
According to the light path structure of the generating device of the radial high-order perfect vortex light beam, the specific implementation process is as follows:
step S100, the Gaussian beam output by the laser 1 passes through the Glan prism 2 to generate a horizontal linear polarization Gaussian beam;
and S200, after the horizontal line polarization Gaussian beam passes through the spatial light modulator 3 loaded with the radial high-order perfect vortex beam phase diagram, generating a radial high-order perfect vortex beam, and performing light intensity detection on the radial high-order perfect vortex beam through the CCD camera 4.
Specifically, the laser 1 outputs a gaussian beam at 1550 nm; the laser 1 outputs a 1550nm gaussian beam which passes through the glan prism 2 with an optical axis direction of 0 ° to generate the horizontally polarized gaussian beam.
Wherein, the radial high-order perfect vortex beam phase diagram is obtained by the following steps:
as shown in fig. 3, the bessel vortex phase, the grating phase and the convex lens phase are superimposed to obtain a radial perfect vortex beam phase diagram.
The phase of the jth order radial perfect vortex beam can be expressed as:
where l is the topological charge number, θ is the azimuth, r0,jIs the length of the interval between two adjacent rings in the Bessel vortex phase of the jth order radial perfect vortex beam, m is the elliptic factor, D is the period of the grating, k is the wave number, f is the focal length of the convex lens, hmin,j≤r≤hmax,jIs the phase range that determines the position of the j-th order radial perfect vortex beam in the radial perfect vortex beam phase map.
And superposing the N radial perfect vortex beam phase diagrams with different radiuses to obtain a radial high-order perfect vortex beam phase diagram.
The phase of the radial high-order perfect vortex beam can be expressed as:
since the grating phase and the convex lens phase are invariant, it can be considered that N different radii of bezier vortex phases are superimposed.
In particular, a fractional order radial high order perfect vortex beam phase map is obtained by the following steps:
replacing the bessel vortex phase exp (il θ) with a fractional order bessel vortex phase:
where l is the topological charge number, θ is the azimuth, MjIs the number of gaps of the jth order radial perfect vortex beam, step is a step function, ljIs the topological charge, θ, of the jth order radial perfect vortex beamjIs the azimuth angle of the j-th order radial perfect vortex beam, which can be expressed as:
where rem is the remainder function.
And superposing the fractional order Bessel vortex phase, the grating phase and the convex lens phase to obtain a fractional order radial perfect vortex beam phase diagram.
And superposing the N radial perfect vortex beam phase diagrams with different radiuses to obtain a fractional order radial high-order perfect vortex beam phase diagram.
Since the grating phase and the convex lens phase are invariant, it can be considered that fractional order bessel vortex phases of N different radii are superimposed.
In summary, the present invention provides an apparatus and a method for generating a radial high-order perfect vortex beam, where the apparatus includes: a laser for outputting a gaussian beam; the Glan prism is arranged behind the laser and used for carrying out polarization modulation on the Gaussian beam to generate a horizontal linear polarization Gaussian beam; the spatial light modulator is arranged behind the Glan prism and used for carrying out phase modulation on the horizontal line polarization Gaussian beam to generate a radial high-order perfect vortex beam; and the CCD camera is arranged below the spatial light modulator and is used for detecting the light intensity of the radial high-order perfect vortex light beam. According to the invention, the radial high-order perfect vortex light beam phase diagram is loaded on the spatial light modulator, and the incident light beam is modulated by using the spatial light modulator, so that the radial high-order perfect vortex light beam is finally generated.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (10)
1. A device for generating a radial high-order perfect vortex beam is characterized by comprising:
a laser for outputting a gaussian beam;
the Glan prism is arranged behind the laser and used for carrying out polarization modulation on the Gaussian beam to generate a horizontal linear polarization Gaussian beam;
the spatial light modulator is arranged behind the Glan prism and used for carrying out phase modulation on the horizontal line polarization Gaussian beam to generate a radial high-order perfect vortex beam;
and the CCD camera is arranged below the spatial light modulator and is used for detecting the light intensity of the radial high-order perfect vortex light beam.
2. The device for generating a radial high-order perfect vortex beam as claimed in claim 1, wherein said laser, said Glan prism and said spatial light modulator are disposed on the same optical axis.
3. The device for generating a radial high-order perfect vortex beam as claimed in claim 1, wherein said spatial light modulator and said CCD camera are disposed on the same optical axis.
4. The device for generating a radial high-order perfect vortex beam of claim 1, wherein said laser has a wavelength of 1550 nm.
5. The device for generating a radial high-order perfect vortex beam as claimed in claim 1, wherein the optical axis direction of said Glan prism is 0 °.
6. The apparatus for generating a radial high-order perfect vortex beam according to claim 1, wherein said spatial light modulator is further configured to load a radial high-order perfect vortex beam phase map.
7. A method for generating a radial high-order perfect vortex beam based on the device for generating a radial high-order perfect vortex beam according to any one of claims 1 to 6, wherein the method for generating a radial high-order perfect vortex beam comprises the following steps:
step A, a Gaussian beam output by the laser passes through the Glan prism to generate a horizontal linear polarization Gaussian beam;
and B, after the horizontal line polarization Gaussian beam passes through the spatial light modulator loaded with the radial high-order perfect vortex beam phase diagram, generating a radial high-order perfect vortex beam, and carrying out light intensity detection on the radial high-order perfect vortex beam through the CCD camera.
8. The method for generating a radially higher order perfect vortex beam of claim 7, wherein said laser outputs a 1550nm gaussian beam.
9. The method for generating a radially higher order perfect vortex beam of claim 8, wherein said laser outputs a 1550nm gaussian beam through said glan prism with an optical axis oriented at 0 ° to generate said horizontally linearly polarized gaussian beam.
10. The method for generating a radial high-order perfect vortex beam according to claim 7, wherein the radial high-order perfect vortex beam phase map is obtained by superposing a Bessel vortex phase, a grating phase and a convex lens phase.
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| CN201911118954.1A CN111007671A (en) | 2019-11-15 | 2019-11-15 | Device and method for generating radial high-order perfect vortex light beam |
| PCT/CN2020/083793 WO2021093260A1 (en) | 2019-11-15 | 2020-04-08 | Device and method for generating radial high-order perfect vortex beam |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111665639A (en) * | 2020-06-03 | 2020-09-15 | 中国人民解放军战略支援部队航天工程大学 | Preparation method of Hermite-like Gaussian beam based on cross phase |
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| CN115037377B (en) * | 2022-05-25 | 2024-04-19 | 中国科学院光电技术研究所 | High-dimension digital signal coding and decoding method and system based on multi-ring perfect vortex beam |
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| CN111665639A (en) * | 2020-06-03 | 2020-09-15 | 中国人民解放军战略支援部队航天工程大学 | Preparation method of Hermite-like Gaussian beam based on cross phase |
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Application publication date: 20200414 |