Anti-interference device for vortex light orbital angular momentum measurement

Abstract

The utility model belongs to the technical field of vortex light orbital angular momentum number measurement auxiliary equipment, and particularly discloses an anti-interference device for vortex light orbital angular momentum number measurement, which comprises a shell, a measurement module is arranged in the shell, and the inner wall of the shell is fixedly connected with a mounting plate; by arranging the shell and the sliding door, when the sliding door is closed, a relatively closed space can be formed in the shell, the influence of an external light source on laser emitted by the laser is avoided, meanwhile, the situation that dust enters the shell is reduced, the anti-interference capability of the device is improved, and meanwhile, under the mutual cooperation of the auxiliary module and the auxiliary assembly, the anti-interference capability of the device is improved. The space where the shell is communicated with the connecting pipe can be actively reduced, the air pressure is increased, positive pressure is formed in the shell compared with the outside, it is guaranteed that external dust cannot enter the shell through a connecting gap between the sliding door and the shell to affect measurement in the use process, and interference of the dust to the measurement result is further reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of vortex light orbital angular momentum number measurement auxiliary equipment, and particularly relates to an anti-interference device for vortex light orbital angular momentum number measurement. Background Art

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

[0003] A search revealed a Chinese patent application for a device and method for measuring the orbital angular momentum of vortex light (authorization publication number CN112880978B). This patent features a simple and readily available detection element, and the ability to rapidly detect the orbital angular momentum of the vortex light used. This device can be widely used for measuring orbital angular momentum in fields such as quantum communication, OAM information encoding and decoding, optical tweezers, optical wrenches, and particle manipulation.

[0004] However, in actual use, in order to prevent the laser from overheating and affecting the measurement, active air blowing is usually used to improve airflow exchange and increase heat dissipation. However, this method easily causes dust to flow rapidly with the airflow, and the flying dust will affect the measurement effect. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings of the prior art and to propose an anti-interference device for measuring the orbital angular momentum of vortex light.

[0006] To achieve the above objectives, the present invention provides an anti-interference device for measuring the orbital angular momentum of vortex light, comprising a housing, a measurement module disposed within the housing, a mounting plate fixedly connected to the inner wall of the housing, a laser disposed on the top of the mounting plate, a sliding door slidably connected to the surface of the housing, and a positive pressure mechanism disposed on the surface of the housing;

[0007] The positive pressure mechanism includes an auxiliary module provided on one side of the housing, and an auxiliary component provided on the other side of the housing;

[0008] Among them, the auxiliary module includes a mounting shell embedded in one side of the outer shell, a partition is fixedly connected to the top of the mounting plate, one end of the laser passes through the partition, and a heat dissipation cavity is formed between one side of the partition, the top of the mounting plate and the interior of the outer shell, and a heat dissipation groove connected to the heat dissipation cavity is opened on the surface of the outer shell.

[0009] In the above technical solution, further, a ventilation slot communicating with the heat dissipation cavity is provided on one side of the mounting shell, a first filter is embedded in the other side of the mounting shell, and a fan is provided inside the mounting shell.

[0010] In the above technical solution, further, the auxiliary component includes a connecting pipe communicated with the interior of the shell, and a threaded sleeve is fixedly connected to a side of the connecting pipe away from the shell.

[0011] In the above technical solution, further, the inner wall of the connecting pipe is slidably connected to an extrusion plate, one side of the extrusion plate is fixedly connected to a threaded rod, and the other end of the threaded rod is threaded through a threaded sleeve and fixedly connected to a rotating block.

[0012] In the above technical solution, further, the surface of the rotating block is provided with anti-slip grooves.

[0013] In the above technical solution, further, a sealing strip is embedded and installed on a side of the sliding door close to the shell.

[0014] In the above technical solution, further, a sealing strip is embedded and installed on a side of the sliding door close to the shell.

[0015] Compared with the prior art, the present invention has the following beneficial effects: by providing an outer shell and a sliding door, a relatively closed space can be formed inside the outer shell when the sliding door is closed, thereby avoiding the influence of external light sources on the laser emission of the laser, and reducing the situation where dust enters the inner shell, thereby improving the anti-interference ability of the device. At the same time, with the mutual cooperation of the auxiliary module and the auxiliary component, the space connecting the outer shell and the connecting pipe can be actively reduced to increase the air pressure, so that a positive pressure is formed inside the outer shell compared to the outside world, thereby ensuring that external dust will not enter the inner shell through the connection gap between the sliding door and the outer shell during use to affect the measurement, and further reducing the interference of dust on the measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the sliding door closing proposed by the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the sliding door opening proposed by the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the auxiliary module proposed in the utility model;

[0019] Figure 4 This is a schematic diagram of the structure of the auxiliary components proposed in the utility model;

[0020] Figure 5 The utility model provides a schematic diagram of the connection between the sealing strip and the sliding door.

[0021] In the figure: 1. Housing; 101. Sliding door; 102. Measuring module; 103. Laser; 104. Sealing strip; 2. Auxiliary module; 201. Mounting shell; 202. Fan; 204. First filter; 205. Partition; 21. Auxiliary component; 2101. Connecting pipe; 2102. Rotating block; 2103. Threaded rod; 2104. Extrusion plate; 2105. Threaded sleeve. DETAILED DESCRIPTION

[0022] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] like Figure 1-Figure 5 The anti-interference device for measuring the orbital angular momentum of vortex light shown in the figure includes a housing 1, a measurement module 102 is disposed inside the housing 1, a mounting plate is fixedly connected to the inner wall of the housing 1, a laser 103 is disposed on the top of the mounting plate, a sliding door 101 is slidably connected to the surface of the housing 1, and a positive pressure mechanism is disposed on the surface of the housing 1;

[0024] The positive pressure mechanism includes an auxiliary module 2 provided on one side of the housing 1, and an auxiliary component 21 provided on the other side of the housing 1;

[0025] Among them, the auxiliary module 2 includes a mounting shell 201 embedded in one side of the outer shell 1, a partition 205 is fixedly connected to the top of the mounting plate, one end of the laser 103 passes through the partition 205, and a heat dissipation cavity is formed between one side of the partition 205, the top of the mounting plate and the interior of the outer shell 1, and a heat dissipation groove connected to the heat dissipation cavity is opened on the surface of the outer shell 1.

[0026] Among them, the measurement module 102 includes a polarizer, a polarization beam splitter, a quarter-wave plate and a reflective spatial light modulator. The bottom of the quarter-wave plate is provided with a polarizer and a CCD camera located on the inner side of the support frame. A beam expander is provided between the polarizer and the quarter-wave plate, and a beam reducer is provided between the quarter-wave plate and the polarizer.

[0027] Specifically, the laser 103 is a Nd:YAG laser 103 with a wavelength of 1064 nm and a power of 2 mW. The beam expander and the beam reducer are composed of two convex lenses with overlapping focal points, which are used to adjust the radius of the light field.

[0028] like Figure 1-Figure 5 As shown, a ventilation slot communicating with the heat dissipation cavity is provided on one side of the mounting shell 201, a first filter 204 is embedded in the other side of the mounting shell 201, and a fan 202 is provided inside the mounting shell 201;

[0029] By starting the fan 202, the outside air can be guided to pass through the first filter 204 into the interior of the mounting shell 201, and the airflow is injected into the heat dissipation cavity through the guidance of the ventilation groove, which can be used for heat dissipation of the laser 103. The airflow after heat dissipation can be directly discharged into the outside through the heat dissipation groove, avoiding dust from entering the interior of the shell 1 and reducing the impact of dust on the measurement process.

[0030] like Figure 1-Figure 5 As shown, the auxiliary component 21 includes a connecting pipe 2101 communicated with the interior of the housing 1 , and a threaded sleeve 2105 is fixedly connected to a side of the connecting pipe 2101 away from the housing 1 .

[0031] The inner wall of the connecting tube 2101 is slidably connected to an extrusion plate 2104 , one side of the extrusion plate 2104 is fixedly connected to a threaded rod 2103 , and the other end of the threaded rod 2103 is threaded through a threaded sleeve 2105 and fixedly connected to a rotating block 2102 .

[0032] The surface of the rotating block 2102 is provided with anti-slip grooves.

[0033] By twisting the rotating block 2102, the threaded rod 2103 can be driven to gradually pass through the threaded sleeve 2105. In this process, the extrusion plate 2104 can be driven to move toward the outer shell 1. The extrusion plate 2104 can reduce the space between the side of the extrusion plate 2104 away from the threaded rod 2103 and the inner wall of the connecting tube 2101. Since the connecting tube 2101 is connected to the outer shell 1, the air pressure at each location is equal. Therefore, the extrusion plate 2104 can increase the air pressure inside the outer shell 1 and the connecting tube 2101 during the movement, so that a positive pressure is formed inside the outer shell 1 compared to the outside world, thereby ensuring that external dust will not enter the interior of the outer shell 1 through the connection gap between the sliding door 101 and the outer shell 1 during use and affect the measurement, thereby further reducing the interference of dust on the measurement results.

[0034] like Figure 1-Figure 5 As shown, a sealing strip 104 is embedded and installed on one side of the sliding door 101 close to the housing 1 .

[0035] The provision of the sealing strip 104 can further improve the sealing performance between the sliding door 101 and the housing 1, and further reduce the situation where external dust enters the interior of the housing 1 through the connection gap.

[0036] Working principle: During use, by starting the fan 202, the outside air can be guided to pass through the first filter 204 into the interior of the mounting shell 201, and the air flow is injected into the heat dissipation cavity through the guidance of the ventilation groove, which can be used for heat dissipation of the laser 103. The air flow after heat dissipation can be introduced into the outside through the heat dissipation groove. By twisting the rotating block 2102, the threaded rod 2103 can be driven to gradually pass through the threaded sleeve 2105. In this process, the extrusion plate 2104 can be driven to move toward the shell 1. The extrusion plate 2104 can be used to reduce the space between the side of the extrusion plate 2104 away from the threaded rod 2103 and the inner wall of the connecting pipe 2101. Since the connecting pipe 2101 is connected to the shell 1, the air pressure at various locations is equal. Therefore, the extrusion plate 2104 can increase the air pressure inside the shell 1 and the connecting pipe 2101 during the movement, so that it forms a positive pressure inside the shell 1 compared to the outside, thereby ensuring that external dust will not enter the interior of the shell 1 through the connection gap between the sliding door 101 and the shell 1 during use to affect the measurement, further reducing the interference of dust on the measurement results.

[0037] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions only illustrate the principles of the present invention. Various changes and improvements are possible without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention.

Claims

1. An anti-interference device for measuring vortex light orbital angular momentum, comprising a housing (1), characterized in that: A measuring module (102) is provided inside the housing (1), a mounting plate is fixedly connected to the inner wall of the housing (1), a laser (103) is provided on the top of the mounting plate, a sliding door (101) is slidably connected to the surface of the housing (1), and a positive pressure mechanism is provided on the surface of the housing (1); The positive pressure mechanism comprises an auxiliary module (2) arranged on one side of the housing (1), and an auxiliary component (21) is arranged on the other side of the housing (1); The auxiliary module (2) includes a mounting shell (201) embedded in one side of the housing (1), a partition (205) is fixedly connected to the top of the mounting plate, one end of the laser (103) passes through the partition (205), a heat dissipation cavity is formed between one side of the partition (205), the top of the mounting plate and the interior of the housing (1), and a heat dissipation groove connected to the heat dissipation cavity is opened on the surface of the housing (1).

2. The anti-interference device for measuring the orbital angular momentum of vortex light according to claim 1, characterized in that: A ventilation slot communicating with the heat dissipation cavity is provided on one side of the installation shell (201), a first filter (204) is embedded and installed on the other side of the installation shell (201), and a fan (202) is provided inside the installation shell (201).

3. The anti-interference device for measuring the orbital angular momentum of vortex light according to claim 1, characterized in that: The auxiliary component (21) comprises a connecting pipe (2101) in communication with the interior of the housing (1), and a threaded sleeve (2105) is fixedly connected to a side of the connecting pipe (2101) away from the housing (1).

4. The anti-interference device for measuring the orbital angular momentum of vortex light according to claim 3, characterized in that: The inner wall of the connecting tube (2101) is slidably connected to an extrusion plate (2104), one side of the extrusion plate (2104) is fixedly connected to a threaded rod (2103), and the other end of the threaded rod (2103) is threadedly passed through a threaded sleeve (2105) and fixedly connected to a rotating block (2102).

5. The anti-interference device for measuring the orbital angular momentum of vortex light according to claim 4, characterized in that: The surface of the rotating block (2102) is provided with anti-slip grooves.

6. The anti-interference device for measuring the orbital angular momentum of vortex light according to claim 1, characterized in that: A sealing strip (104) is embedded and installed on one side of the sliding door (101) close to the housing (1).

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