Stabilizing mechanism of vortex light orbital angular momentum number measuring device

Abstract

The utility model belongs to the technical field of vortex light orbital angular momentum number measuring auxiliary equipment, and particularly discloses a stabilizing mechanism of a vortex light orbital angular momentum number measuring device, which comprises a support frame. The adjusting mechanism is used for adjusting the positions of the polarizer, the polarization beam splitter, the quarter-wave plate, the reflective spatial light modulator, the polarization analyzer, the CCD camera, the beam expander and the beam compressor, the position of the optical element can be adjusted according to measurement requirements, different measurement scenes are adapted, when the position needs to be adjusted, a pull plate is pulled to drive a sliding plate to compress a spring through a sliding rod, and the position of the optical element is adjusted. In the process, the limiting rod is separated from the limiting hole, so that limiting of the position of the mounting rod can be relieved, the position of a connected structure can be adjusted through the mounting rod and the mounting plate, the position is adjusted through sliding of the sliding groove, it is ensured that the light beam path does not deviate due to element movement, and normal use of the light beam path can be ensured; and the measurement stability is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of auxiliary equipment for measuring the orbital angular momentum number of vortex light, and particularly relates to a stabilizing mechanism for a device for measuring the orbital angular momentum number of vortex light. Background Technique

[0002] Vortex light with phase singularities and carrying orbital angular momentum has important application prospects in the fields of optical manipulation, optical tweezers, quantum communication, and particle acceleration. The orbital angular momentum number of vortex light not only determines the torsional force when vortex light interacts with matter, but also, as a new light field dimension, can greatly expand the information capacity in optical communication. Therefore, the orbital angular momentum number carries the energy and information of the light field, and its measurement is extremely important;

[0003] After retrieval, the Chinese patent discloses a device and method for measuring the orbital angular momentum number of vortex light (authorization announcement number CN112880978B). The characteristics of this patent lie in the simplicity and easy availability of the detection element, and it can quickly detect the orbital angular momentum number of the used vortex light, so it can be widely applied to the measurement of the orbital angular momentum number in the fields of quantum communication, OAM information encoding and decoding, optical tweezers, optical wrenches, particle manipulation, etc. However, during the measurement process, it is necessary to adjust the positions of the polarizer, polarization beam splitter, quarter-wave plate, reflective spatial light modulator, analyzer, CCD camera, beam expander, and beam reducer according to the actual situation and ensure that the optical path remains unchanged. After adjusting and installing in the traditional way, it is necessary to re-align the positions to improve the measurement stability. Therefore, those skilled in the art have provided a stabilizing mechanism for a device for measuring the orbital angular momentum number of vortex light to solve the above-mentioned problems. Content of the Utility Model

[0004] The purpose of the utility model is to solve the shortcomings existing in the prior art, and to propose a stabilizing mechanism for a device for measuring the orbital angular momentum number of vortex light.

[0005] To achieve the above object, the utility model provides a stabilizing mechanism for a device for measuring the orbital angular momentum number of vortex light, including a support frame. At the top of the support frame, there are two symmetrically distributed connecting plates fixedly connected. Between the two connecting plates, a laser, a polarizer, a polarization beam splitter, a quarter-wave plate, and a reflective spatial light modulator are arranged in sequence from left to right. At the bottom of the quarter-wave plate, there is an analyzer and a CCD camera located inside the support frame. Several groups of adjusting mechanisms are arranged on the surfaces of the connecting plates and the support frame;

[0006] A beam expander is arranged between the polarizer and the quarter-wave plate, and a beam reducer is arranged between the quarter-wave plate and the analyzer.

[0007] In the above technical solution, further, the adjusting mechanism includes two mounting plates, one side of the mounting plate is fixedly connected with a mounting rod, sliding grooves are formed on the surfaces of the connecting plate and the support frame, and a plurality of groups of limiting holes are formed on the surfaces of the connecting plate and the support frame. The number of each group of limiting holes is two and they are symmetrically distributed with the sliding groove as the center. The other end of the mounting rod penetrates through the adjacent sliding groove and is slidably connected with the inner wall of the sliding groove.

[0008] In the above technical solution, further, an adjusting cavity is formed inside the mounting rod, a sliding plate is slidably connected to the inner wall of the adjusting cavity, a sliding rod is fixedly connected to the surface of the sliding plate, and the other end of the sliding rod penetrates through the mounting rod and is fixedly connected with a pulling plate.

[0009] In the above technical solution, further, the diameter of the sliding plate is larger than that of the sliding rod, a spring is fixedly connected to the surface of the sliding plate, and the other end of the spring is fixedly connected with the inner wall of the adjusting cavity.

[0010] In the above technical solution, further, two symmetrically distributed limiting rods are eccentrically fixedly connected to the surface of the pulling plate, and the limiting rods are matched with the limiting holes.

[0011] In the above technical solution, further, a light-shielding shell is detachably arranged on the top of the support frame.

[0012] Compared with the prior art, the present utility model has the following beneficial effects: The adjusting mechanism is used to adjust the positions of the polarizer, polarization beam splitter, quarter-wave plate, reflective spatial light modulator, analyzer, CCD camera, beam expander and beam reducer. The positions of the optical elements can be adjusted according to the measurement requirements to adapt to different measurement scenarios. When the position needs to be adjusted, the pulling plate is pulled to drive the sliding plate to compress the spring through the sliding rod. During this process, the limiting rod is separated from the limiting hole, so that the limitation of the position of the mounting rod can be released, and then the position of the connected structure can be adjusted through the mounting rod and the mounting plate. And it slides inside the preset sliding groove, so that the original path of the light beam passing through each structure will not be biased when the position is changed, which can ensure the normal use of the light beam path and improve the stability of the measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a schematic structural diagram proposed by the present utility model;

[0014] Figure 2 is a separation schematic diagram of the light-shielding shell proposed by the present utility model;

[0015] Figure 3 is a connection schematic diagram of the mounting plate and the quarter-wave plate proposed by the present utility model;

[0016] Figure 4This is a schematic diagram showing the distribution of the pull plate and the limiting rod proposed by the present utility model.

[0017] In the figure: 1, support frame; 101, laser; 102, connecting plate; 103, polarizer; 104, polarization beam splitter; 105, quarter-wave plate; 106, reflective spatial light modulator; 107, analyzer; 108, CCD camera; 2, adjustment mechanism; 201, mounting plate; 202, adjustment cavity; 203, limiting rod; 204, pull plate; 205, sliding rod; 206, spring; 207, sliding plate; 208, mounting rod; 3, light-shielding housing. Specific embodiments

[0018] In order to more clearly understand the above-mentioned objects, features, and advantages of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] As Figures 1 - 4 shown, a stabilizing mechanism of a vortex light orbital angular momentum number measuring device includes a support frame 1. At the top of the support frame 1, two symmetrically distributed connecting plates 102 are fixedly connected. Between the two connecting plates 102, a laser 101, a polarizer 103, a polarization beam splitter 104, a quarter-wave plate 105, and a reflective spatial light modulator 106 are arranged in sequence from left to right. At the bottom of the quarter-wave plate 105, an analyzer 107 and a CCD camera 108 located inside the support frame 1 are provided. On the surfaces of the connecting plate 102 and the support frame 1, several groups of adjustment mechanisms 2 are provided;

[0020] An expander is arranged between the polarizer 103 and the quarter-wave plate 105, and a beam reducer is arranged between the quarter-wave plate 105 and the analyzer 107.

[0021] Specifically, the laser 101 selects a Nd:YAG laser 101 with a wavelength of 1064 nm and a power of 2 mW. The expander and the beam reducer are composed of two convex lenses with coincident foci, and are used to adjust the radius of the light field.

[0022] As Figures 1 - 4 shown, the adjustment mechanism 2 includes two mounting plates 201. On one side of the mounting plate 201, a mounting rod 208 is fixedly connected. Sliding grooves are formed on the surfaces of both the connecting plate 102 and the support frame 1, and several groups of limiting holes are formed on the surfaces of the connecting plate 102 and the support frame 1. The number of each group of limiting holes is two and they are symmetrically distributed with the sliding groove as the center. The other end of the mounting rod 208 penetrates through the adjacent sliding groove and is slidably connected to the inner wall of the sliding groove.

[0023] The interior of the mounting rod 208 is provided with an adjustment cavity 202. A sliding plate 207 is slidably connected to the inner wall of the adjustment cavity 202. A sliding rod 205 is fixedly connected to the surface of the sliding plate 207. The other end of the sliding rod 205 penetrates through the mounting rod 208 and is fixedly connected to a pulling plate 204.

[0024] The diameter of the sliding plate 207 is larger than that of the sliding rod 205. A spring 206 is fixedly connected to the surface of the sliding plate 207. The other end of the spring 206 is fixedly connected to the inner wall of the adjustment cavity 202.

[0025] Two symmetrically distributed limiting rods 203 are eccentrically and fixedly connected to the surface of the pulling plate 204. The limiting rods 203 are matched with the limiting holes.

[0026] Specifically, the adjusting mechanism 2 is used to adjust the positions of the polarizer 103, polarization beam splitter 104, quarter-wave plate 105, reflective spatial light modulator 106, analyzer 107, CCD camera 108, beam expander and beam reducer. The positions of the optical elements can be adjusted according to the measurement requirements to adapt to different measurement scenarios;

[0027] And the mounting plate 201 is used for connecting the polarizer 103, polarization beam splitter 104, quarter-wave plate 105, reflective spatial light modulator 106, analyzer 107, CCD camera 108, beam expander and beam reducer. The positions of the above structures can be changed by moving the position of the mounting plate 201;

[0028] By moving the mounting rod 208, its position can be adjusted by sliding through the sliding groove, ensuring that the light beam path does not shift due to the movement of the components, and ensuring the normal use of the light beam path;

[0029] Under normal conditions, the position of the pulling plate 204 can be limited by the spring 206, so that it drives the limiting rod 203 to insert into the limiting hole. Thus, under the combined action of the limiting rod 203 and the limiting hole, the mounting rod 208, pulling plate 204, sliding rod 205 and sliding plate 207 are limited, and further the positioning of the connection structure position is realized, improving the stability effect during the measurement process. When the position needs to be adjusted, pull the pulling plate 204 so that it drives the sliding plate 207 to compress the spring 206 through the sliding rod 205. During this process, the limiting rod 203 is separated from the limiting hole, so that the limitation of the position of the mounting rod 208 can be released, and further the positions of the connected structures can be adjusted through the mounting rod 208 and the mounting plate 201.

[0030] As Figures 1 - 4 shown, a light-shielding shell 3 is detachably arranged on the top of the support frame 1.

[0031] The setting of the light-shielding shell 3 can prevent external light sources from affecting the light source emitted by the laser 101 and improve the measurement effect.

[0032] Working principle: Under normal conditions, it can limit the position of the pull plate 204 under the action of the spring 206, so that the pull plate drives the limit rod 203 to insert into the limit hole. Thus, under the combined action of the limit rod 203 and the limit hole, the installation rod 208, the pull plate 204, the sliding rod 205 and the sliding plate 207 are limited, and then the positioning of the connection structure position is realized, improving the stability effect during the measurement process. When the position needs to be adjusted, pull the pull plate 204 to drive the sliding plate 207 to compress the spring 206 through the sliding rod 205. During this process, the limit rod 203 is separated from the limit hole, so that the limit on the position of the installation rod 208 can be released, and then the position of the connected structure can be adjusted through the installation rod 208 and the installation plate 201.

[0033] The above shows and describes the basic principle, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A stabilizing mechanism for a device for measuring the orbital angular momentum number of vortex light, comprising a support frame (1), characterized in that, At the top of the support frame (1), there are two connecting plates (102) fixedly connected and symmetrically distributed. Between the two connecting plates (102), a laser (101), a polarizer (103), a polarization beam splitter (104), a quarter-wave plate (105), and a reflective spatial light modulator (106) are arranged in sequence from left to right. At the bottom of the quarter-wave plate (105), a polarizer (107) and a CCD camera (108) located inside the support frame (1) are provided. On the surfaces of the connecting plates (102) and the support frame (1), several groups of adjusting mechanisms (2) are provided; An expander is arranged between the polarizer (103) and the quarter-wave plate (105), and a beam reducer is arranged between the quarter-wave plate (105) and the polarizer (107).

2. The stabilizing mechanism of a vortex light orbital angular momentum number measuring device according to claim 1, characterized in that The adjusting mechanism (2) includes two mounting plates (201). On one side of the mounting plate (201), a mounting rod (208) is fixedly connected. On the surfaces of the connecting plates (102) and the support frame (1), sliding grooves are formed, and several groups of limiting holes are formed on the surfaces of the connecting plates (102) and the support frame (1). The number of each group of limiting holes is two and they are symmetrically distributed with the sliding groove as the center. The other end of the mounting rod (208) penetrates through the adjacent sliding groove and is slidably connected to the inner wall of the sliding groove.

3. The stabilizing mechanism of a vortex light orbital angular momentum number measuring device according to claim 2, characterized in that An adjusting cavity (202) is formed inside the mounting rod (208). A sliding plate (207) is slidably connected to the inner wall of the adjusting cavity (202). A sliding rod (205) is fixedly connected to the surface of the sliding plate (207). The other end of the sliding rod (205) penetrates through the mounting rod (208) and is fixedly connected to a pulling plate (204).

4. The stabilizing mechanism of a vortex light orbital angular momentum number measuring device according to claim 3, characterized in that The diameter of the sliding plate (207) is larger than that of the sliding rod (205). A spring (206) is fixedly connected to the surface of the sliding plate (207). The other end of the spring (206) is fixedly connected to the inner wall of the adjusting cavity (202).

5. The stabilizing mechanism of a vortex light orbital angular momentum number measuring device according to claim 3, characterized in that, On the surface of the pulling plate (204), two limiting rods (203) are eccentrically fixedly connected and symmetrically distributed. The limiting rods (203) are matched with the limiting holes.

6. The stabilizing mechanism of a vortex light orbital angular momentum number measuring device according to claim 1, characterized in that A light-shielding shell (3) is detachably arranged on the top of the support frame (1).

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