CN214201971U - System for controlling depth and intensity of focus of chirped pierce Gaussian vortex beam - Google Patents
System for controlling depth and intensity of focus of chirped pierce Gaussian vortex beam Download PDFInfo
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- CN214201971U CN214201971U CN202023324157.XU CN202023324157U CN214201971U CN 214201971 U CN214201971 U CN 214201971U CN 202023324157 U CN202023324157 U CN 202023324157U CN 214201971 U CN214201971 U CN 214201971U
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- 230000005540 biological transmission Effects 0.000 claims abstract description 27
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 13
- CPBQJMYROZQQJC-UHFFFAOYSA-N helium neon Chemical compound [He].[Ne] CPBQJMYROZQQJC-UHFFFAOYSA-N 0.000 claims abstract description 5
- 230000010287 polarization Effects 0.000 claims description 5
- 230000001131 transforming effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
本实用新型公开了一种控制啁啾皮尔斯高斯涡旋光束聚焦深度和强度的系统，包括：分体式氦氖激光器，用于发射高斯光束；半波片和偏振分束立方，用于控制高斯光束的功率；扩束准直系统，用于使入射光束的光强均匀分布；非偏振分束立方，用于分束光束并产生干涉；液晶空间光调制器，其加载有特定的掩模板，用于对入射光束进行调制，变换入射光束波前；傅里叶透镜，用于对光束进行傅里叶变换调制；反射镜，用于改变光束的传输方向；可调光阑，用于选取像方焦平面上的正一级干涉条纹；CMOS摄像机，用于观察在传输距离范围内的光束；抛物势介质，用于提供光束传输所需的外部环境。本实用新型节省成本，能够很好地控制光束的聚焦深度和强度。
The utility model discloses a system for controlling the focusing depth and intensity of a chirped Pierce Gaussian vortex beam, comprising: a split helium-neon laser, which is used for emitting Gaussian beams; The power of the beam expander and collimation system is used to uniformly distribute the light intensity of the incident beam; the non-polarized beam splitter cube is used to split the beam and generate interference; the liquid crystal spatial light modulator, which is loaded with a specific mask, uses It is used to modulate the incident beam and transform the wavefront of the incident beam; the Fourier lens is used to perform Fourier transform modulation on the beam; the mirror is used to change the transmission direction of the beam; the adjustable diaphragm is used to select the image direction. Positive first-order interference fringes on the focal plane; CMOS camera to observe the beam within the transmission distance; parabolic potential medium to provide the external environment required for beam transmission. The utility model saves cost and can well control the focus depth and intensity of the light beam.
Description
Technical Field
The utility model relates to the field of optical technology, concretely relates to system for controlling chirp pierce gauss vortex light beam depth of focus and intensity.
Background
In 2012, the pierce beam was first theoretically modeled and experimentally generated. Since then, the pierce beam has been the focus of attention. The pierce beam is a structurally invariant beam defined in an infinite space and having excellent transmission characteristics such as self-healing and self-focusing. When transmitted in free space, the pierce beam is scaled by different dimensions in the lateral direction. Meanwhile, novel beams derived from the pierce beam have been proposed by researchers, such as circular pierce beams, odd-symmetric pierce beams, and the like. The light beam not only retains the original excellent characteristics of the Pierce light beam, but also shows more interesting transmission characteristics. The series of research results attract the deep exploration of scholars in the field of Pierce beams.
The photon potential, which is determined by the refractive index profile of the medium as an effective means of manipulating the beam, can be formed by selecting a specific medium, which can be understood as a source of tensile or compressive forces to which the beam is subjected during transmission in order to more clearly and visually describe the effect of the photon potential. Among them, the parabolic potential is a mode of photon potential, and has various influences on the transmission characteristics of the light beam, such as changing the transmission tendency, adjusting the depth of focus and intensity, and the like.
In fact, the controllable focusing depth and intensity can make the beam focusing have more application potential in the fields of particle manipulation, laser tracking and the like. Therefore, the control system of the focusing depth and the focusing intensity of the light beam is very significant for the application and development of the laser technology.
Disclosure of Invention
In view of the above, in order to facilitate the development and application of the controllable depth of focus and intensity of the light beam, the present invention provides a system for controlling the depth of focus and intensity of the chirped pierce gaussian vortex light beam.
The utility model provides a technical scheme that its technical problem adopted is:
the utility model provides a system for control chirp pierce gauss vortex light beam depth of focus and intensity, include:
the split helium-neon laser is used for emitting Gaussian beams;
the half-wave plate and the polarization beam splitting cube are used for controlling the power of the Gaussian beam;
the beam expanding and collimating system is used for enabling the light intensity of an incident beam to be uniformly distributed and enabling the quality of the light beam to be better;
a non-polarizing beam splitting cube for splitting the beam and generating interference;
the liquid crystal spatial light modulator is loaded with a specific mask plate, and the mask plate comprises a Fourier transform graph of an initial light field plane of a chirped Pierce Gaussian vortex light beam and is used for modulating an incident light beam and flexibly and swiftly transforming the wavefront of the incident light beam;
the first Fourier lens is used for carrying out Fourier transform modulation on the light beam;
the adjustable diaphragm is used for selecting a positive first-order interference fringe on an image space focal plane of the first Fourier lens;
the second Fourier lens is used for carrying out Fourier transform modulation on the light beam again and extracting chirp Pierce Gaussian vortex light beam information carried by the primary interference fringe on the far field;
the third Fourier lens is used for carrying out Fourier transform modulation on the light beam again to obtain an initial light field of the chirped Pierce Gaussian vortex light beam;
a parabolic medium for providing an external environment required for light beam transmission; the light beams are transmitted periodically in the parabolic potential medium, and the focusing depth and the intensity of the light beams can be controlled by changing chirp factor information carried by a Fourier transform graph on the liquid crystal spatial light modulator and the refractive index distribution condition of the parabolic potential medium;
and the CMOS camera is used for observing the light beam in the transmission distance range.
Further, the system for controlling the depth of focus and the intensity of the chirped pierce Gaussian vortex beam further comprises a first reflector, which is positioned between the second Fourier lens and the third Fourier lens and is used for changing the transmission direction of the light beam so that the light beam coming out of the second Fourier lens is transmitted to the third Fourier lens.
Further, the system for controlling the depth of focus and the intensity of the chirped pierce Gaussian vortex beam further comprises a second reflector, which is positioned between the third Fourier lens and the parabolic medium and is used for changing the transmission direction of the light beam so that the light beam coming out of the third Fourier lens is transmitted to the parabolic medium.
Compared with the prior art, the beneficial effects of the utility model include at least:
the utility model discloses a method that liquid crystal spatial light modulator and space Fourier transform combined together produces chirp pierce gauss vortex light beam, and this method has the cost and hangs down, and the system is simple, advantages such as convenient operation to the diffraction loss of incident light is not high, and output is great, saves the cost, has improved efficiency, can control the depth of focus and the intensity of light beam well.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a diagram of the system apparatus of the present invention for controlling the depth and intensity of a chirped Pierce Gaussian vortex beam focus;
fig. 2 is a fourier transform plot of a chirped pierce gaussian vortex beam provided in the present invention;
fig. 3 is a transmission diagram of a middle chirped pierce gaussian vortex beam according to the present invention under the condition of different chirp factors β and Ω being 2/m; (a1) - (a3) a transverse intensity map of the fourier transform plane; (b1) - (b3) a transmission side view; (c1) - (c3) a transverse intensity map from the focal plane; (d) intensity peak curve.
Fig. 4 is a transmission diagram of a middle chirped pierce gaussian vortex beam according to the present invention under the condition that different parabolic coefficients Ω and β are equal to 1; (a1) - (a3) a transverse intensity map of the fourier transform plane; (b1) - (b3) a transmission side view; (c1) - (c3) a transverse intensity map from the focal plane; (d) an intensity peak curve; (e) the centroid moves the curve.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments accompanying the drawings are described in detail below. It should be noted that the described embodiments are some, not all embodiments of the present invention, and all other embodiments obtained by those skilled in the art without any creative work are included in the scope of the present invention.
Example 1
As shown in fig. 1-4, the utility model provides a system for controlling chirp pierce gauss vortex light beam depth of focus and intensity, including split type helium neon laser, half-wave plate, polarization beam splitting cube, beam expanding collimation system, non-polarization beam splitting cube, liquid crystal spatial light modulator, first fourier lens, adjustable diaphragm, second fourier lens, third fourier lens, parabolic potential medium and CMOS camera;
the split helium-neon laser is used for emitting a Gaussian beam;
the half-wave plate and the polarization beam splitting cube are used for controlling the power of the Gaussian beam;
the beam expanding and collimating system is used for enabling the light intensity of an incident beam to be uniformly distributed and enabling the quality of the light beam to be better;
the non-polarizing beam splitting cube is used for splitting a light beam and generating interference;
the liquid crystal spatial light modulator is loaded with a specific mask plate, and the mask plate comprises a Fourier transform graph of an initial light field plane of a chirped Pierce Gaussian vortex light beam and is used for modulating an incident light beam and flexibly and swiftly transforming the wavefront of the incident light beam;
the first Fourier lens is used for performing Fourier transform modulation on the light beam;
the adjustable diaphragm is used for selecting a positive first-order interference fringe on an image space focal plane of the first Fourier lens;
the second Fourier lens is used for carrying out Fourier transform modulation on the light beam again, and extracting chirp Pierce Gaussian vortex light beam information carried by the primary interference fringe on the far field;
the third Fourier lens is used for carrying out Fourier transform modulation on the light beam again to obtain an initial light field of the chirped Pierce Gaussian vortex light beam;
the parabolic potential medium is used for providing an external environment required by light beam transmission; the light beams are transmitted periodically in the parabolic potential medium, and the focusing depth and the intensity of the light beams can be controlled by changing chirp factor information carried by a Fourier transform graph on the liquid crystal spatial light modulator and the refractive index distribution condition of the parabolic potential medium;
the CMOS camera is used for observing light beams in a transmission distance range.
Specifically, the system for controlling the depth of focus and the intensity of the chirped Pierce Gaussian vortex beam further comprises a first reflector, which is positioned between the second Fourier lens and the third Fourier lens and is used for changing the transmission direction of the beam so that the beam coming out of the second Fourier lens is transmitted to the third Fourier lens.
Specifically, the system for controlling the depth and the intensity of the chirped pierce Gaussian vortex beam further comprises a second reflector, which is positioned between the third Fourier lens and the parabolic medium and is used for changing the transmission direction of the light beam so that the light beam coming out of the third Fourier lens is transmitted to the parabolic medium.
Specifically, the liquid crystal spatial light modulator is loaded with a fourier transform map of the initial light field plane of a chirped pierce gaussian vortex beam obtained by computer simulation.
Specifically, the collimated and expanded gaussian light beam is reflected by a liquid crystal spatial light modulator loaded with frequency spectrum information of the chirped pierce gaussian vortex light beam to complete the acquisition of the loaded information, information of the chirped pierce gaussian vortex light beam carried by a primary interference fringe on a far field is extracted by a spatial filter composed of two Fourier lenses and a diaphragm, and finally an initial light field of the chirped pierce gaussian vortex light beam is obtained by one Fourier lens.
The utility model discloses combine chirp, vortex and pierce gauss light beam, obtain the pierce gauss vortex light beam of chirp to intensity distribution, the phase distribution to this light beam transmission in throwing the object potential medium have carried out deep analysis in this patent. As can be seen from fig. 3, the intensity of the optical field at the focus of the pierce-gaussian vortex beam under the influence of different chirps changes significantly during the transmission process of the periodic inversion; as can be seen from fig. 4, when the parabolic potential coefficients are different, the transmission period of the chirped pierce gaussian vortex beam is significantly changed, so that the focusing depth and the focusing intensity thereof are correspondingly adjusted. Therefore, when the light beam periodically transmits in the parabolic medium, the focusing depth and the intensity of the light beam can be controlled by changing the chirp factor information carried by the Fourier transform map on the liquid crystal spatial light modulator and the refractive index distribution condition of the parabolic medium
The utility model discloses a method that liquid crystal spatial light modulator and space Fourier transform combined together produces chirp pierce gauss vortex light beam, and this method has the cost and hangs down, and the system is simple, advantages such as convenient operation to the diffraction loss of incident light is not high, and output is great, saves the cost, has improved efficiency, can control the depth of focus and the intensity of light beam well.
The above-mentioned embodiments only represent one embodiment of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (3)
1. A system for controlling depth of focus and intensity of a chirped pierce gaussian vortex beam, comprising:
the split helium-neon laser is used for emitting Gaussian beams;
the half-wave plate and the polarization beam splitting cube are used for controlling the power of the Gaussian beam;
the beam expanding and collimating system is used for enabling the light intensity of an incident beam to be uniformly distributed and enabling the quality of the light beam to be better;
a non-polarizing beam splitting cube for splitting the beam and generating interference;
the liquid crystal spatial light modulator is loaded with a mask plate, and the mask plate comprises a Fourier transform graph of an initial light field plane of a chirped Pierce Gaussian vortex light beam and is used for modulating an incident light beam and transforming the wavefront of the incident light beam;
the first Fourier lens is used for carrying out Fourier transform modulation on the light beam;
the adjustable diaphragm is used for selecting a positive first-order interference fringe on an image space focal plane of the first Fourier lens;
the second Fourier lens is used for carrying out Fourier transform modulation on the light beam again and extracting chirp Pierce Gaussian vortex light beam information carried by the primary interference fringe on the far field;
the third Fourier lens is used for carrying out Fourier transform modulation on the light beam again to obtain an initial light field of the chirped Pierce Gaussian vortex light beam;
a parabolic medium for providing an external environment required for light beam transmission; the light beams are transmitted periodically in the parabolic potential medium, and the focusing depth and the intensity of the light beams can be controlled by changing chirp factor information carried by a Fourier transform graph on the liquid crystal spatial light modulator and the refractive index distribution condition of the parabolic potential medium;
and the CMOS camera is used for observing the light beam in the transmission distance range.
2. The system for controlling the depth and intensity of a chirped pierce gaussian vortex beam according to claim 1, further comprising a first mirror disposed between the second fourier lens and the third fourier lens for changing the transmission direction of the light beam so that the light beam from the second fourier lens is transmitted to the third fourier lens.
3. The system for controlling the depth and intensity of a chirped pierce-gaussian vortex beam according to claim 1, further comprising a second reflector, disposed between the third fourier lens and the parabolic potential medium, for changing the transmission direction of the light beam so that the light beam from the third fourier lens is transmitted to the parabolic potential medium.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023324157.XU CN214201971U (en) | 2020-12-31 | 2020-12-31 | System for controlling depth and intensity of focus of chirped pierce Gaussian vortex beam |
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| CN202023324157.XU CN214201971U (en) | 2020-12-31 | 2020-12-31 | System for controlling depth and intensity of focus of chirped pierce Gaussian vortex beam |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115166971A (en) * | 2022-08-04 | 2022-10-11 | 浙江农林大学 | Method and system for improving sudden self-focusing capability of first-order circular Airy derivative light beam |
| CN115236786A (en) * | 2022-08-02 | 2022-10-25 | 西北工业大学 | Liquid crystal phase plate, preparation method and double-sided vortex light beam generation system |
| CN115291404A (en) * | 2022-07-18 | 2022-11-04 | 华南师范大学 | Method and system for controlling symmetric Pierce Gaussian vortex beam trajectory and focusing |
| CN116300065A (en) * | 2023-02-08 | 2023-06-23 | 华南师范大学 | An experimental system for generating surface plasmons |
-
2020
- 2020-12-31 CN CN202023324157.XU patent/CN214201971U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115291404A (en) * | 2022-07-18 | 2022-11-04 | 华南师范大学 | Method and system for controlling symmetric Pierce Gaussian vortex beam trajectory and focusing |
| CN115236786A (en) * | 2022-08-02 | 2022-10-25 | 西北工业大学 | Liquid crystal phase plate, preparation method and double-sided vortex light beam generation system |
| CN115236786B (en) * | 2022-08-02 | 2024-02-02 | 西北工业大学 | Liquid crystal phase plate, preparation method and double-sided vortex beam generation system |
| CN115166971A (en) * | 2022-08-04 | 2022-10-11 | 浙江农林大学 | Method and system for improving sudden self-focusing capability of first-order circular Airy derivative light beam |
| CN115166971B (en) * | 2022-08-04 | 2023-09-01 | 浙江农林大学 | Method and system for improving abrupt self-focusing capability of first-order round Airy derivative light beam |
| CN116300065A (en) * | 2023-02-08 | 2023-06-23 | 华南师范大学 | An experimental system for generating surface plasmons |
| CN116300065B (en) * | 2023-02-08 | 2023-11-28 | 华南师范大学 | An experimental system for generating surface plasmons |
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Granted publication date: 20210914 |