CN215729157U - System for generating and regulating symmetrical dovetail light beams - Google Patents
System for generating and regulating symmetrical dovetail light beams Download PDFInfo
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- CN215729157U CN215729157U CN202120761529.0U CN202120761529U CN215729157U CN 215729157 U CN215729157 U CN 215729157U CN 202120761529 U CN202120761529 U CN 202120761529U CN 215729157 U CN215729157 U CN 215729157U
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Abstract
The utility model discloses a system for generating and regulating and controlling symmetrical dovetail beams, which comprises: a helium-neon laser for generating a gaussian beam; the collimation beam expanding lens is used for collimating and expanding the Gaussian beam; a reflective spatial light modulator for loading a phase hologram; the non-polarization beam splitter prism is used for receiving the Gaussian beam, splitting the Gaussian beam, and transmitting a part of the Gaussian beam to the reflective spatial light modulator and then continuously transmitting the part of the Gaussian beam; the 4f optical system is used for filtering the light beam reflected by the reflective spatial light modulator to obtain an initial light field; and the beam quality analyzer is used for collecting beam propagation information. In addition, the focusing distance and the focusing intensity of the symmetrical dovetail beam can be adjusted and controlled by changing the constant p. The utility model saves time and material cost, improves efficiency and solves the problem that the symmetrical dovetail beam can not be obtained and regulated at present.
Description
Technical Field
The utility model relates to the technical field of optics, in particular to a system for generating and regulating symmetrical dovetail beams.
Background
In the field of optics, the solution of paraxial wave equations has been a research hotspot. The Laguerre Gaussian beam, the Hermitian Gaussian beam and the Neissus Gaussian beam are proved to be stable solutions of paraxial wave equations in a cylindrical coordinate system, a rectangular coordinate system and an elliptic coordinate system by theory. In recent years, the singular point solution of the paraxial wave equation has received much attention. The structure of this solution is based on the theory of optical mutation, described by diffraction mutation integration. According to the dimension of the solution, the solution can be divided into seven structural types: folds, cusps, dovetails, butterflies, elliptical, hyperbolic, and parabolic. In the present study, most of the studies involve only low-order, abrupt beams, i.e., an airy beam and a pierce beam.
In order to achieve a stable light field structure, the generation of a symmetric light field has been a hot topic. In 2014, p.vaveliuk proposed a deformation of the airy beam — a symmetric airy beam. The beam is automatically focused during propagation to form a bright spot, and then is split into four independent main lobes. In a study of 2018, the symmetrical Airy beam can guide the movement of vortex due to the existence of the symmetrical light field and the self-focusing and diverging characteristics of the symmetrical light field. The discovery expands the application prospect of optical particle capture and optical communication. However, the symmetric airy beam has a low order and is difficult to control the focusing ability. How to obtain a symmetrically distributed and adjustable optical field is an urgent problem to be solved in the field of optical technology. In the current research, however, a solution has not been given.
Disclosure of Invention
The system for generating and regulating the symmetrical dovetail light beams is provided based on the diversity and the adjustability of the dovetail light beams, and aims at solving the problem that the symmetrical dovetail light beams cannot be generated and regulated.
The technical scheme adopted by the utility model for solving the technical problems is as follows:
a system for generating and manipulating a symmetrical dovetail beam, comprising:
a laser for generating a gaussian beam;
the collimation beam expanding lens is arranged at the exit of the laser and is used for collimating and expanding the Gaussian beam;
the reflection type spatial light modulator is arranged on a transmission path of the Gaussian beam and is used for loading the phase hologram; the phase hologram is obtained by simulating the interference field distribution of plane waves and symmetrical dovetail beams;
the non-polarization beam splitting prism is arranged between the collimation beam expander and the reflective spatial light modulator and is used for receiving the Gaussian beam, splitting the Gaussian beam, and transmitting a part of the Gaussian beam to the reflective spatial light modulator and then continuously transmitting the part of the Gaussian beam;
the 4f optical system is used for receiving the light beam reflected by the reflective spatial light modulator and filtering the light beam to obtain an initial light field;
and the beam quality analyzer is arranged behind the 4f optical system and is used for collecting the propagation information of the initial light field to obtain the symmetrical dovetail beam.
Further, the 4f optical system includes two lenses and one diaphragm; the diaphragm is positioned between the two lenses, and the distance from the diaphragm to the two lenses is the focal length of each lens; the first lens performs Fourier transform on the light beam reflected by the reflective spatial light modulator to obtain a frequency spectrum plane; the diaphragm is used for selecting the positive first-order interference fringes of the frequency spectrum surface; the second lens is used for carrying out inverse Fourier transformation on the light beam selected by the diaphragm.
Furthermore, the he-ne laser, the collimation beam expander, the non-polarization beam splitter prism, the 4f optical system, the reflection type spatial light modulator and the beam quality analyzer are arranged on the same axis.
Further, the laser is a helium-neon laser.
Further, the laser produces a gaussian beam with a wavelength of 632.8 nm.
Further, the magnification of the collimating beam expander is × 8.
Further, the beam quality analyzer resolution was 5742 × 3268.
Compared with the prior art, the utility model has the beneficial effects that at least:
the system for generating and regulating the symmetrical dovetail light beam solves the problem that the symmetrical dovetail light beam cannot be obtained in the related technology, expands the types and the structures of symmetrical light fields, and has potential application value in particle capture and optical communication.
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 introduced 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 based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a system for generating and manipulating symmetrical dovetail beams of examples 1 and 2;
FIG. 2 is a phase hologram produced in example 1 and example 2;
FIG. 3 is a side view and a partial cross-sectional view of a symmetrical dovetail beam propagation in example 1;
FIG. 4 is a graph of the intensity of propagation of a symmetrical dovetail beam in example 1;
FIG. 5 is a partial cross-sectional view of a symmetrical dovetail beam in example 2;
FIG. 6 is a flow chart for controlling the system for generating and controlling a symmetrical dovetail beam according to example 3;
FIG. 7 is a phase hologram corresponding to different p-values in example 3;
FIG. 8 is a graph of the propagation intensity of symmetrical dovetail beams at different p-values in example 3.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.
Example 1
As shown in fig. 1, the present invention provides a system for generating and regulating a symmetric dovetail beam, which includes a he-ne laser, a collimating beam expander, a reflective spatial light modulator, a non-polarizing beam splitter prism, a 4f optical system and a beam quality analyzer;
the helium-neon laser is used for generating a Gaussian beam;
the collimation and beam expansion lens is arranged at the exit of the laser and is used for collimating and expanding the Gaussian beam;
the reflective spatial light modulator is arranged on a transmission path of the Gaussian beam and used for loading a phase hologram; the phase hologram is obtained by simulating the interference field distribution of plane waves and symmetrical dovetail beams;
the non-polarization beam splitter prism is arranged between the collimation beam expander and the reflective spatial light modulator and is used for receiving the Gaussian beam, splitting the Gaussian beam, and transmitting a part of the light to the reflective spatial light modulator and then continuing to transmit the light;
the 4f optical system is used for receiving the light beam reflected by the reflective spatial light modulator and filtering the light beam to obtain an initial light field;
the beam quality analyzer is arranged behind the 4f optical system and used for collecting the propagation information of the initial light field to obtain the symmetrical dovetail beam.
Specifically, the 4f optical system includes two lenses and one diaphragm; the diaphragm is positioned between the two lenses, and the distance from the diaphragm to the two lenses is the focal length of each lens; the first lens performs Fourier transform on the light beam reflected by the reflective spatial light modulator to obtain a frequency spectrum plane; the diaphragm is used for selecting the positive first-order interference fringes of the frequency spectrum surface; the second lens is used for carrying out inverse Fourier transformation on the light beam selected by the diaphragm.
Specifically, the he-ne laser, the collimation beam expander, the non-polarization beam splitter prism, the 4f optical system, the reflection type spatial light modulator and the beam quality analyzer are arranged on the same axis.
The derivation process of the symmetrical dovetail light field expression of the utility model is as follows:
the expression of one-dimensional dovetail is
Where p is a constant factor used to manipulate the symmetrical dovetail beam. The angular spectrum distribution is as follows:
in the formula, kxFor spectral space variables, to obtain a symmetric dovetail beam, we need to change the parity of the spectrum, and then the angular spectrum distribution of the symmetric dovetail beam is:
and finally, performing inverse Fourier transform on the formula and multiplying the result by a Gaussian term (ensuring that the energy is limited), so as to obtain an expression of the symmetrical dovetail beam in an initial plane, wherein the expression is as follows:
in the formula w0Is Gaussian beam width, p is a constant factor for regulating the symmetrical dovetail beam, SSw (·) is a variant of dovetail integration:
substituting the expression of the initial plane of the symmetrical dovetail beam into the Fresnel diffraction integral formula to obtain the analytical expression of the symmetrical dovetail beam in the three-dimensional space, namely：
Where i is an imaginary unit, λ is a wavelength, and k is a wave number.
In this embodiment, the parameters are selected as follows: w is a04mm, p is 0. Fig. 2 is a phase hologram produced in the present embodiment. FIG. 3 is a side view and a partial cross-sectional view of a simulated symmetric dovetail beam propagation in this embodiment. Wherein (a) is a side view of propagation, and (b1) - (b4) are
And z is 0, 0.67m, 1.00m and 1.45 m. FIG. 4 is a graph of simulated symmetric dovetail beam propagation intensity in this example. Wherein the normalized light intensity is defined as: the ratio of the intensity at any point to the intensity at the initial plane.
Example 2
As shown in fig. 1, the present invention provides a system for generating and regulating a symmetric dovetail beam, which includes a he-ne laser, a collimating beam expander, a reflective spatial light modulator, a non-polarizing beam splitter prism, a 4f optical system and a beam quality analyzer;
the helium-neon laser is used for generating a Gaussian beam; the wavelength of the Gaussian beam is 632.8 nm;
the collimation and beam expansion lens is arranged at an exit of the laser and is used for collimating and expanding the Gaussian beam; the multiplying power is multiplied by 8;
the reflective spatial light modulator is arranged on a transmission path of the Gaussian beam and used for loading a phase hologram; the phase hologram is obtained by simulating the interference field distribution of plane waves and symmetrical dovetail beams;
the non-polarization beam splitter prism is arranged between the collimation beam expander and the reflective spatial light modulator and is used for receiving the Gaussian beam, splitting the Gaussian beam, and transmitting a part of the light to the reflective spatial light modulator and then continuing to transmit the light;
the resolution of the 4f optical system is 5742 multiplied by 3268, and the 4f optical system is used for receiving and filtering the light beam reflected by the reflective spatial light modulator to obtain an initial light field;
the beam quality analyzer is arranged behind the 4f optical system and used for collecting the propagation information of the initial light field to obtain the symmetrical dovetail beam.
Specifically, the 4f optical system includes two lenses and one diaphragm; the diaphragm is positioned between the two lenses, and the distance from the diaphragm to the two lenses is the focal length of each lens; the first lens performs Fourier transform on the light beam reflected by the reflective spatial light modulator to obtain a frequency spectrum plane; the diaphragm is used for selecting the positive first-order interference fringes of the frequency spectrum surface; the second lens is used for carrying out inverse Fourier transformation on the light beam selected by the diaphragm.
Specifically, the he-ne laser, the collimation beam expander, the non-polarization beam splitter prism, the 4f optical system, the reflection type spatial light modulator and the beam quality analyzer are arranged on the same axis.
In this embodiment, the parameters are selected as follows: w is a04mm, p is 0. Fig. 2 is a phase hologram produced in the present embodiment. FIG. 5 is a partial cross-sectional view of a symmetrical dovetail beam produced in this embodiment. Wherein (a1) - (a4) correspond to (b1) - (b4) of fig. 3. It can be seen that the symmetrical dovetail beam generated by the system of the present embodiment is feasible and practical to match the simulation.
Example 3
As shown in fig. 6, in this embodiment, on the basis of embodiment 1, the following steps are performed:
s1, changing a constant p;
s2, acquiring a new phase hologram;
and S3, regenerating a symmetrical dovetail beam.
In this embodiment, the parameters are selected as follows: w is a04 mm. Fig. 7 shows phase holograms corresponding to different p-values. Fig. 8 is a graph of the propagation intensity of symmetrical dovetail beams at different p-values, and it can be seen that as p increases, the focus intensity increases and the focus distance becomes longer. Thus, the symmetric dovetail beam can be tuned by adjusting the constant p.
The system is adopted to generate and regulate the symmetrical dovetail light beams, has the advantages of low manufacturing cost, simple system, convenient operation and the like, and solves the problem that the symmetrical dovetail light beams cannot be generated and regulated.
The above examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (7)
1. A system for generating and manipulating a symmetrical dovetail beam, comprising:
a laser for generating a gaussian beam;
the collimation beam expanding lens is arranged at the exit of the laser and is used for collimating and expanding the Gaussian beam;
the reflection type spatial light modulator is arranged on a transmission path of the Gaussian beam and is used for loading the phase hologram; the phase hologram is obtained by simulating the interference field distribution of plane waves and symmetrical dovetail beams;
the non-polarization beam splitting prism is arranged between the collimation beam expander and the reflective spatial light modulator and is used for receiving the Gaussian beam, splitting the Gaussian beam, and transmitting a part of the Gaussian beam to the reflective spatial light modulator and then continuously transmitting the part of the Gaussian beam;
the 4f optical system is used for receiving the light beam reflected by the reflective spatial light modulator and filtering the light beam to obtain an initial light field;
and the beam quality analyzer is arranged behind the 4f optical system and is used for collecting the propagation information of the initial light field to obtain the symmetrical dovetail beam.
2. The system for generating and manipulating a symmetrical dovetail beam according to claim 1, wherein said 4f optical system comprises two lenses and one stop; the diaphragm is positioned between the two lenses, and the distance from the diaphragm to the two lenses is the focal length of each lens; the first lens performs Fourier transform on the light beam reflected by the reflective spatial light modulator to obtain a frequency spectrum plane; the diaphragm is used for selecting the positive first-order interference fringes of the frequency spectrum surface; the second lens is used for carrying out inverse Fourier transformation on the light beam selected by the diaphragm.
3. The system for generating and manipulating a symmetrical dovetail beam of claim 1, wherein said he-ne laser, collimating beam expander, unpolarized beam splitter prism, 4f optical system, reflective spatial light modulator, and beam quality analyzer are disposed on the same axis.
4. The system for generating and manipulating a symmetrical dovetail beam of claim 1, wherein said laser is a helium-neon laser.
5. The system for generating and manipulating a symmetrical dovetail beam of claim 1, wherein said laser generates a gaussian beam having a wavelength of 632.8 nm.
6. The system for generating and manipulating a symmetrical dovetail beam of claim 1, wherein said collimating beam expander lens has a magnification of x 8.
7. The system for generating and manipulating a symmetrical dovetail beam of claim 1, wherein said beam quality analyzer resolution is 5742 x 3268.
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Cited By (1)
| 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 symmetrical Pierce Gaussian vortex light beam track and focusing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115291404A (en) * | 2022-07-18 | 2022-11-04 | 华南师范大学 | Method and system for controlling symmetrical Pierce Gaussian vortex light beam track and focusing |
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