CN114689170A - Device and method for measuring single-mode perfect vortex rotation with large topological charge value - Google Patents
Device and method for measuring single-mode perfect vortex rotation with large topological charge value Download PDFInfo
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- 238000002834 transmittance Methods 0.000 claims description 4
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- 101100291452 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) MMS1 gene Proteins 0.000 description 1
- 101100149590 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) SLM6 gene Proteins 0.000 description 1
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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
- G01J1/0411—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings using focussing or collimating elements, i.e. lenses or mirrors; Aberration correction
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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
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- G01J1/0407—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings
- G01J1/0414—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings using plane or convex mirrors, parallel phase plates, or plane beam-splitters
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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
- G01J1/0429—Optical elements not provided otherwise, e.g. manifolds, windows, holograms, gratings using polarisation elements
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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
- G01J11/00—Measuring the characteristics of individual optical pulses or of optical pulse trains
- G01J2011/005—Streak cameras
Abstract
A beam expander, a linear polarizer, a first reflector, a second reflector, a reflective pure-phase liquid crystal spatial light modulator, a plano-convex cylindrical mirror, a Fourier lens, a diaphragm and a CCD camera are sequentially arranged along the laser output direction of the laser, the control end of the reflective pure-phase liquid crystal spatial light modulator is connected with the control end of a first PC, the control end of the CCD camera is connected with the control end of a second PC, the CCD camera is arranged on the focal plane of the Fourier lens, and the plano-convex cylindrical mirror is positioned at any position between the reflective pure-phase liquid crystal spatial light modulator and the Fourier lens. The invention can measure the perfect vortex rotation, has a large range of topological charge values, and can measure the perfect vortex rotation with different base angle parameters. The invention has simple light path and strong flexibility, the position and the angle of the plane convex cylindrical mirror can be adjusted, the operation is very convenient, and the invention can be applied to the detection of the eddy optical rotation with large topological charge number.
Description
Technical Field
The invention relates to the technical field of vortex optics, in particular to a device and a method for measuring perfect vortex rotation with a large topological charge value.
Background
A vortex beam is a beam with a vortex characteristic in which the phase or wavefront of the light is helical and the complex amplitude contains a helical phase term, which can be expressed as
Wherein, l is the topological charge,
are angular coordinates. Each photon in a vortex-rotated beam carries
And has orthogonality, i.e. any two vortex light beams of different orders are orthogonal to each other, and the vortex light beams of different orders can be separated from each other. Due to the properties, the vortex light beam has great potential value in the fields of optical communication, detection, quantum information processing and the like.
Vortex rotation with large topological charges is often required for better performance. The ring radius of conventional vortex light increases with increasing topological charge. In 2013, Ostrovsky et al put forward the concept of perfect vortex rotation for the first time, and their ring diameters are independent of the topological charge value [ Opt Lett 38, 534-536(2013) ].
The existing measurement method commonly used for the vortex rotation topological charge value can be integrally divided into two categories: interferometry and diffraction. However, the method for measuring the vortex rotation is not completely suitable for the perfect vortex rotation because the perfect vortex rotation exists only in a limited distance near a focal plane, the beam size is independent of the number of angular quanta, and the Bessel mode for generating the perfect vortex rotation has the characteristics of non-diffractivity and the like. For perfect vortex rotation, the most common method is the coaxial interference method [ Opt Let 40, 597-. However, the method uses double-light-path interference, vortex optical rotation and Gaussian light need to be adjusted to be coaxial interference, the implementation is difficult, the light path is complex, and when the topological charge value is large, spiral patterns are too dense and difficult to distinguish, so the method is difficult to be used for measuring the perfect vortex optical rotation with the large topological charge value. In addition, in the diffraction method for measuring the topological charge value of vortex light, the grating suitable for measuring perfect vortex rotation is also available: composite fork gratings, standard dammann gratings [ Opt Let 35, 3495-. Therefore, the existing method for measuring the perfect vortex rotation topological charge value faces the problems of complex light path, small range of the detected topological charge value and the like.
Disclosure of Invention
The invention provides a device and a method for measuring the perfect vortex optical rotation of a large topological charge value, aiming at the problem that the conventional perfect vortex optical measurement of the large topological charge value is difficult.
The technical scheme of the invention is as follows:
the device is characterized by comprising a laser, wherein a beam expander, a linear polarizer, a first reflector, a second reflector, a reflective pure-phase liquid crystal spatial light modulator, a plano-convex cylindrical mirror, a Fourier lens, a diaphragm and a CCD camera are sequentially arranged along the laser output direction of the laser, the control end of the reflective pure-phase liquid crystal spatial light modulator is connected with the first PC control end, the control end of the CCD camera is connected with the second PC control end, the second PC control end is used for displaying the light intensity distribution received by the CCD camera, the CCD camera is arranged on the focal plane of the Fourier lens, and the plano-convex cylindrical mirror is positioned at any position between the reflective pure-phase liquid crystal spatial light modulator and the Fourier lens.
The measuring method for the large topological charge value perfect vortex optical rotation by utilizing the measuring device for the large topological charge value perfect vortex optical rotation comprises the following steps:
1) starting the laser, collimating and expanding a laser beam emitted by the laser after passing through a beam expander, and emitting the laser beam to a polarizer to generate linearly polarized light; after the linearly polarized light passes through the plane convex cylindrical mirror through the Bessel Gaussian light field output by the reflective pure-phase liquid crystal spatial light modulator, the complex amplitude of the Bessel Gaussian light field is as follows:
wherein A islIs a constant term, krIs the radial wavenumber, kzIs the wave number in the propagation direction, and the ratio γ is kr/kzIs the base angle parameter, JlIs a first class of an order l bessel function,
is the cylindrical coordinate of the light field, l is the topological charge value of perfect vortex rotation, omegagIs the beam waist radius of the gaussian;
the symmetry axis of the plano-convex cylindrical mirror is coincident with the y axis, and the transmittance function of the plano-convex cylindrical mirror is as follows:
wherein k is 2 pi/lambda is the wave number of the incident light, lambda is the wavelength of the incident light, and f is the focal length of the planoconvex lens;
bessel Gaussian light passes through the plano-convex cylindrical mirror and is focused to a focal region of the plano-convex cylindrical mirror through the Fourier lens; the light spot of the focus area is imaged on the detection surface of the CCD camera,
2) the light spots observed from the detection surface of the CCD camera are distributed in an inclined stripe shape, and the number of dark stripes between the two brightest points is equal to the size of the topological load l; observing the inclination direction of the light spot on the CCD camera to obtain the symbol of the topological charge value l of the perfect vortex light beam to be detected: the sign of the topological charge value is judged according to the inclination direction of the stripes, and the connecting line of the two brightest points is positive when the connecting line is positioned in two quadrants and negative when the connecting line is positioned in one quadrant and three quadrants.
The ratio k of the radial wave number and the propagation direction wave number of the perfect vortex optical rotation to be measuredr/kzWhen the base angle parameter gamma of the perfect vortex optical rotation is larger, the interval of light spots on the CCD camera can be increased by rotating the planoconvex cylindrical mirror around a non-functional axis, so that the result definition of the measured light spots is improved, and the result is more accurate; when the aperture of the planoconvex cylindrical mirror is large enough, the planoconvex cylindrical mirror can rotate around a non-functional axis, so that the topological charge value of the perfect vortex rotation of any base angle parameter can be measured.
The invention has the beneficial effects that:
compared with the prior art for measuring the perfect vortex optical rotation, the device and the method for measuring the perfect vortex optical rotation by using the planoconvex cylindrical mirror have the advantages that the light path is simple in structure, low in alignment requirement, convenient to implement, low in requirements on the position and the angle of the planoconvex cylindrical mirror, large in range of the measured topological value l, suitable for the perfect vortex optical rotation with any base angle parameter gamma and the like, and the size and the sign of the topological value of the perfect vortex optical rotation to be measured can be directly determined through the number and the direction of the stripes received by the CCD.
Drawings
FIG. 1 is a schematic diagram of an optical path of a detection apparatus for perfect vortex rotation with a large topological charge value according to the present invention.
Among them, 1-laser; 2-a beam expander; 3-linear polarizer; 4-a first mirror; 5-a second mirror; 6-reflective phase-only liquid crystal Spatial Light Modulator (SLM); 7-a first PC control terminal; 8-plano-convex cylindrical mirror; 9-a fourier lens; 10-a diaphragm; 11-a CCD camera; 12 second PC control terminal.
FIG. 2 is a schematic diagram: (a) in the embodiment, under the condition of no plano-convex cylindrical mirror, the perfect vortex optical rotation with different topological charge values is realized; (b) in the embodiment, under the condition of a plano-convex cylindrical mirror, the measurement results of the perfect vortex optical rotation with different topological charge values are obtained; (c) the measurement result of the perfect vortex rotation topological charge value obtained by simulation in this embodiment is shown.
FIG. 3: (a) in the embodiment, the measurement result is a measurement result when the perfect vortex optical topological load value to be measured is larger and is 40; (b) the simulation results are the measurement results of the perfect vortex rotation with the topological charge value of 40 in the embodiment.
FIG. 4: (a) in the embodiment, the perfect vortex light base angle parameter is increased to 0.6, and the plano-convex cylindrical mirror 8 keeps a vertical measurement result with the optical axis; (b) in the present embodiment, the base angle parameter is 0.6, and the measurement result is obtained after the planoconvex lens is rotated by 30 ° around the nonfunctional axis direction.
FIG. 5: (a) for the present example, the measurement results of the plano-convex cylindrical mirror placed at a distance of 0.15m from the SLM and the fourier lens 9 placed at a distance of slm0.4m; (b) to keep the position of the fourier lens 9 unchanged, the plano-convex cylindrical mirror is moved to a measurement close to the position of the fourier lens at a distance of 0.37m from the SLM.
Detailed Description
The invention will now be further described with reference to the embodiments and the accompanying drawings. The following examples are intended to illustrate the invention and are not intended to limit its scope. If the experimental conditions are not specified in the examples, they are usually according to the conventional conditions or according to the conditions recommended by the selling companies.
Referring to fig. 1, fig. 1 is a schematic optical path diagram of a large-topology-value perfect-eddy optical rotation detection apparatus according to the present invention. As can be seen from the figure, the measuring device of the large topological charge value perfect vortex optical rotation is characterized by comprising a laser 1, a beam expander 2, a linear polarizer 3, a first reflector 4, a second reflector 5, a reflective pure phase liquid crystal spatial light modulator 6, a planoconvex cylindrical mirror 8, a Fourier lens 9, a diaphragm 10 and a CCD camera 11 are sequentially arranged along the laser output direction of the laser 1, the control end of the reflective pure phase liquid crystal spatial light modulator 6 is connected with the first PC control end 7, the control end of the CCD camera 11 is connected with a second PC control end 12, the second PC control end 12 displays the light intensity distribution received by the CCD camera 11, the CCD camera 11 is arranged on the back focal plane of the Fourier lens 9, and the planoconvex cylindrical mirror 8 is arranged at any position between the reflective pure-phase liquid crystal spatial light modulator 6 and the Fourier lens 9.
The measuring method for the large topological charge value perfect vortex optical rotation by utilizing the measuring device for the large topological charge value perfect vortex optical rotation comprises the following steps:
1) starting the laser 1, collimating and expanding laser beams emitted by the laser 1 after passing through a beam expander 2, and emitting the laser beams to a polarizer 3 to generate linearly polarized light; after the linearly polarized light passes through the plane convex cylindrical mirror 8 through the Bessel Gaussian light field output by the reflective pure-phase liquid crystal spatial light modulator 6, the complex amplitude of the Bessel Gaussian light field is as follows:
wherein A islIs a constant term, krIs the radial wavenumber, kzIs the wave number in the propagation direction, and the ratio γ is kr/kzIs the base angle parameter, JlIs a first class of order-l bessel function,
is the cylindrical coordinate of the light field, l is the topological charge value of perfect vortex rotation, omegagIs the beam waist radius of the gaussian; the symmetry axis of the planoconvex cylindrical mirror 8 is coincident with the y axis, and the transmittance function is as follows:
wherein k is 2 pi/λ, where λ is the wave number of incident light, λ is the wavelength of incident light, and f is the focal length of the planoconvex lens 8; bessel Gaussian light passes through the plano-convex cylindrical mirror 8 and then is focused to a focal region of the plano-convex cylindrical mirror through the Fourier lens 9; the light spot of the focal area is imaged on the detection surface of the CCD camera 11;
2) the light spots observed from the detection surface of the CCD camera 11 are distributed in an inclined stripe shape, and the number of dark stripes between the two brightest points is equal to the size of the topological load l; observing the inclination direction of the light spot on the CCD camera 11 to obtain the symbol of the topological charge value l of the perfect vortex light beam to be measured: the sign of the topological charge value is judged according to the inclination direction of the stripes, and the connecting line of the two brightest points is positive when the connecting line is positioned in two quadrants and negative when the connecting line is positioned in one quadrant and three quadrants.
The ratio k of the radial wave number and the propagation direction wave number of the perfect vortex optical rotation to be measuredr/kzWhen the base angle parameter gamma is larger, namely the base angle parameter gamma of the perfect vortex optical rotation is larger, the interval of light spots on the CCD camera 11 can be increased by rotating the planoconvex cylindrical mirror 8 around a non-functional axis, so that the definition of a measured light spot result is improved, and the result is more accurate; when the aperture of the planoconvex cylindrical mirror 8 is large enough, the planoconvex cylindrical mirror 8 can rotate around a non-functional axis, so that the topological charge value of the perfect vortex optical rotation of any base angle parameter can be measured.
Examples
The linearly polarized light is reflected by the first reflecting mirror 4 and the second reflecting mirror 5, then irradiates on the reflective pure phase liquid crystal Spatial Light Modulator (SLM)6, and uses the first PC control end 7 to control the reflective pure phase liquid crystal spatial light modulator 6 to perform phase modulation on incident light, and the modulation function is as follows:
wherein l is a topological charge value of the perfect vortex rotation, atan2(y, x) is a four-quadrant arc tangent of coordinates, k is 2 pi/lambda is the wave number of incident light, lambda is the wavelength 1064nm of the incident light, gamma is a base angle parameter of the perfect vortex rotation, the ring diameter influencing the perfect vortex rotation, n is a refractive index parameter, g is a base angle parameter of the perfect vortex rotation, andxand gyThe number of periods in the x and y directions of the blazed grating, respectively, in the screen area is limited by the SLM resolution. After the linearly polarized light is subjected to phase modulation of the SLM, a plurality of diffraction orders can be formed, and the +1 st diffraction order is a Bessel Gaussian light field capable of generating perfect vortex rotation;
after the Bessel Gaussian light field is transmitted for a distance, the light irradiates a plano-convex cylindrical mirror 8 with the focal length of 0.8m and the non-functional direction vertical to the desktop, and the transmittance function of the plano-convex cylindrical mirror 8 is as follows:
the Bessel Gaussian light field is propagated for a distance again after passing through the planoconvex lens 8, is focused by a Fourier lens 9 with the focal length of 0.1m, uses a diaphragm 10 to filter diffraction orders except the +1 order, and finally forms an image on a focal plane of the Fourier lens 9;
a CCD camera 11 is placed in the focal plane of the fourier lens 9 to detect the final diffracted light intensity distribution.
The experiment of the method for detecting the perfect vortex optical rotation topological charge value of the invention verifies that: a plano-convex cylindrical mirror 8 having a focal length of 0.8m is placed at a distance of 0.15m from the SLM, a fourier lens 9 having a focal length of 0.1m is placed at a distance of 0.4m from the SLM, and a CCD camera 11 is placed on the back focal plane of the fourier lens 9.
Firstly, the base angle parameter of the perfect vortex optical rotation is selected to be 0.4, the topological charge value l is sequentially selected to be 1, 5, 10 and 15, if the planoconvex lens 8 is not added, as shown in figure 2(a), the ring diameter of the perfect vortex optical rotation on the back focal plane at the moment is not influenced by the topological charge value. When the plano-convex cylindrical mirror 8 is placed at a designated position, the plane of the plano-convex cylindrical mirror 8 is perpendicular to the optical axis, and the non-functional direction of the plano-convex cylindrical mirror 8 is perpendicular to the desktop, a series of diffraction fringes can be obtained on the receiving surface, as shown in fig. 2 (b). Observing the intensity distribution, the absolute value and sign of the topological charge value l of the incident beam can be rapidly distinguished: the absolute value l of the topological charge value is equal to the number of dark stripes between two brightest points in the diffraction stripes, the sign of the topological charge value is judged according to the inclination direction of the stripes, and the connecting line of the two brightest points is positive when being positioned in two-four quadrants and negative when being positioned in one-three quadrants. The corresponding simulation results are shown in fig. 2 (c).
To further illustrate that the method is still applicable to a large topological charge value, the topological charge value is 40, the experimental and simulation results are shown in fig. 3, the stripes are still clear and recognizable, and the number of dark stripes is equal to the absolute value of the topological charge value l.
To further illustrate that the method is suitable for the measurement of perfect vortex rotation of different base angle parameters, the base angle parameter is increased from 0.4 to 0.6. Fig. 3(a) shows the result that the plane of the planoconvex lens 8 remains perpendicular to the optical path, and the base angle parameter affects the distance between the diffraction fringes. The width of the overall fringes can be increased by rotating the planoconvex lens 8 about the non-functional axis, thereby increasing the distance between the diffraction fringes, as shown in figure 3(b) after a 15 deg. rotation, the fringes are again clear. In the present method, therefore, the influence of fringe definition due to the increase in base angle parameter γ can be compensated for by rotating the planoconvex lens 8.
For comparison, moving the planoconvex lens 8 from a position 0.15m from the SLM to a position 0.35m from the SLM while keeping the positions of other elements unchanged, fig. 4(a) and (b) show the light intensity distribution diagrams of the receiving surface before and after the movement, respectively. FIG. 5: (a) for the measurement results of the plano-convex cylindrical mirror 8 placed at a distance of 0.15m from the SLM and the fourier lens 9 placed at a distance of slm0.4m in this example; (b) to keep the position of the fourier lens 9 unchanged, the planoconvex lens 8 is moved to a measurement close to the position of the fourier lens at a distance of 0.37m from the SLM.
It can be seen from the figure that, the distribution of the diffracted light intensity has no obvious change in the process, and the movement of the plano-convex cylindrical mirror 8 between the SLM6 and the fourier lens 9 does not affect the detection result.
In summary, the above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modifications, equivalents and the like which come within the spirit of the invention are intended to be included within the scope of the invention.
Claims (3)
1. A measuring device for the perfect vortex optical rotation with a large topological charge value is characterized by comprising a laser (1), a beam expander (2), a linear polarizer (3), a first reflector (4), a second reflector (5), a reflective pure-phase liquid crystal spatial light modulator (6), a planoconvex cylindrical lens (8), a Fourier lens (9), a diaphragm (10) and a CCD camera (11) are sequentially arranged along the laser output direction of the laser (1), the control end of the reflective pure-phase liquid crystal spatial light modulator (6) is connected with a first PC control end (7), the reflective pure-phase liquid crystal spatial light modulator (6) is controlled by the first PC control end (7) to perform phase modulation on incident light, the control end of the CCD camera (11) is connected with a second PC control end (12), and the second PC control end (12) is used for displaying the light intensity distribution received by the CCD camera (11), the CCD camera (11) is arranged on a focal plane of the Fourier lens (9), and the plano-convex cylindrical mirror (8) is positioned at any position between the reflective pure-phase liquid crystal spatial light modulator (6) and the Fourier lens (9).
2. The method for measuring the high-topology perfect vortex rotation by using the device for measuring the high-topology perfect vortex rotation according to claim 1, is characterized by comprising the following steps:
1) starting the laser (1), collimating and expanding laser beams emitted by the laser (1) after passing through a beam expander (2), and making the laser beams enter a polarizer (3) to generate linearly polarized light; after the linearly polarized light passes through the plane convex cylindrical mirror (8) through a Bessel Gaussian light field output by the reflective pure-phase liquid crystal spatial light modulator (6), the complex amplitude of the Bessel Gaussian light field is as follows:
wherein, AlIs a constant term, krIs the radial wavenumber, kzIs the wave number in the propagation direction, and the ratio γ is kr/kzIs the base angle parameter, JlIs a first class of an order l bessel function,
is the cylindrical coordinate of the light field, l is the topological charge value of perfect vortex rotation, omegagIs the beam waist radius of the gaussian; the symmetry axis of the planoconvex cylindrical mirror (8) is coincident with the y axis, and the transmittance function of the planoconvex cylindrical mirror (8) is as follows:
wherein k is 2 pi/lambda is the wave number of incident light, lambda is the wavelength of the incident light, and f is the focal length of the planoconvex lens (8); the Bessel Gaussian light passes through the plano-convex cylindrical mirror (8) and then is focused to the focal region of the plano-convex cylindrical mirror through the Fourier lens (9); the light spot of the focus area is imaged on the detection surface of the CCD camera (11);
2) light spots observed from the detection surface of the CCD camera (11) are distributed in an inclined stripe shape, and the number of dark stripes between the two brightest points is equal to the size of the topological charge l; observing the inclination direction of light spots on the CCD camera (11) to obtain the symbol of the topological charge value l of the perfect vortex light beam to be measured: the sign of the topological charge value is judged according to the inclination direction of the stripes, and the connecting line of the two brightest points is positive when the connecting line is positioned in two quadrants and negative when the connecting line is positioned in one quadrant and three quadrants.
3. The method of claim 2, wherein a ratio k of a radial wavenumber to a propagation direction wavenumber of the perfect vortex rotation to be measuredr/kzWhen the base angle parameter gamma of the perfect vortex optical rotation is larger, the interval of light spots on the CCD camera (11) can be increased by rotating the planoconvex cylindrical mirror (8) around a non-functional axis, so that the result definition of the measured light spots is improved, and the result is more accurate; when the aperture of the planoconvex cylindrical mirror (8) is large enough, the planoconvex cylindrical mirror (8) can rotate around a non-functional axis, so that the topological charge value of the perfect vortex rotation of any base angle parameter can be measured.
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| WO2024051801A1 (en) * | 2022-09-09 | 2024-03-14 | 中国科学院上海光学精密机械研究所 | Curved fork-shaped grating structure, and curved fork-shaped grating and preparation method therefor |
| CN117705304A (en) * | 2023-12-11 | 2024-03-15 | 中国地质大学（武汉） | Vortex beam topology charge number measuring system, method, device, equipment and medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024050973A1 (en) * | 2022-09-09 | 2024-03-14 | 中国科学院上海光学精密机械研究所 | Device and method for preparing reflective curved fork-shaped grating |
| WO2024051801A1 (en) * | 2022-09-09 | 2024-03-14 | 中国科学院上海光学精密机械研究所 | Curved fork-shaped grating structure, and curved fork-shaped grating and preparation method therefor |
| CN117705304A (en) * | 2023-12-11 | 2024-03-15 | 中国地质大学（武汉） | Vortex beam topology charge number measuring system, method, device, equipment and medium |
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