An optical path coupling device

Abstract

The application provides an optical path coupling device, and belongs to the technical field of laser communication. The optical path coupling device comprises a limiting device, a box body, a hollow optical fiber, a reflecting mirror, a first connecting structure and a second connecting structure. In a first direction, an installation channel is defined in the inside of the limiting device, and a first groove, a second groove and at least one airflow channel are formed in one side of the limiting device and communicated with the installation channel. One side of the box body is provided with an exit window. The hollow optical fiber is arranged in the installation channel, and a first through hole is formed in one side of the hollow optical fiber. The airflow channel is communicated with the hollow optical fiber through the first through hole. The reflecting mirror is arranged in the box body, so that the laser entering the first groove through the entrance window can be reflected by the reflecting mirror and then emitted from the exit window through the installation channel and the second groove. The optical path coupling device provided by the application has a simple structure and is easy to operate, and the success rate of the coupling process of the laser and the hollow optical fiber and the service life of the hollow optical fiber are improved.

Description

Technical Field

[0001] This invention relates to the field of laser communication technology, and more particularly to an optical path coupling device. Background Technology

[0002] High-order harmonic (HHG) processes can generate coherent deep ultraviolet / soft X-ray sources, which can be used for valence electron and inner-shell electron dynamics measurements, exploring material structure and band structure, manipulating magnetic material properties, and mesa deep ultraviolet lithography. Because deep ultraviolet / soft X-rays are strongly absorbed in air, HHG processes must be performed in a vacuum. Generally, gas can be introduced into the vacuum cavity to interact with the femtosecond laser in three ways: using a gas target, a gas nozzle, or a hollow-core fiber (HCF) structure.

[0003] The vacuum structure of existing optical coupling devices does not allow the port of the hollow fiber to be seen, which leads to great uncertainty in the initial adjustment of the laser and hollow fiber coupling process. This not only reduces the coupling efficiency and limits the HHG generation efficiency, but may also damage the hollow fiber by the femtosecond laser, causing the experiment to fail. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to overcome the shortcomings of the prior art and provide an optical path coupling device.

[0005] This invention provides the following technical solution: an optical path coupling device, comprising:

[0006] A limiting device, along a first direction, defines an installation channel within its interior, and one side of the limiting device has a first groove, a second groove, and at least one airflow channel communicating with the installation channel;

[0007] The enclosure has a projection window on one side;

[0008] A hollow optical fiber is inserted into the installation channel. A first through hole is opened on one side of the hollow optical fiber, and the airflow channel is connected to the hollow optical fiber through the first through hole.

[0009] A first connecting structure and a second connecting structure, wherein the housing is connected to the first groove through the first connecting structure, one end of the second connecting structure is connected to the second groove, and the other end of the second connecting structure is provided with an entrance window;

[0010] A reflector is disposed in the housing so that a laser beam incident through the entrance window into the first groove can pass through the mounting channel and the second groove, be reflected by the reflector, and exit through the exit window.

[0011] In some embodiments of the present invention, the first groove and the second groove are respectively disposed at both ends of the mounting channel along the first direction.

[0012] Furthermore, the airflow channels are divided into two sets, which are arranged at intervals.

[0013] Both sets of airflow channels are located between the first groove and the second groove.

[0014] Furthermore, one end of the hollow optical fiber is located in the first groove, and the other end of the hollow optical fiber is located in the second groove.

[0015] Furthermore, a clearance groove is provided on one side of the limiting device, and the clearance groove is located between the two sets of airflow channels, so as to divide the installation channel into a first section and a second section through the clearance groove;

[0016] The hollow optical fiber is inserted into the clearance groove.

[0017] Furthermore, the connection end between the first groove and the mounting channel is provided with an adhesive to form a first sealing structure at one end of the mounting channel;

[0018] The connection end between the second groove and the mounting channel is provided with an adhesive to form a second sealing structure at the other end of the mounting channel.

[0019] Furthermore, the relief groove is provided with colloid to form a third sealing structure in the relief groove, thereby sealing the relief groove through the third sealing structure;

[0020] The third sealing structure is wrapped around a portion of the hollow optical fiber.

[0021] Furthermore, the housing is equipped with a position adjuster, and the reflector is connected to the output end of the position adjuster so as to control the reflector to move along the first direction through the output end of the position adjuster.

[0022] Furthermore, the axis of the hollow optical fiber, the axis of the mounting channel, the axis of the first connecting structure, and the axis of the second connecting structure all coincide.

[0023] Furthermore, along the first direction, a lens is provided on the side of the entrance window opposite to the housing.

[0024] The embodiments of the present invention have the following advantages: by setting a first groove and a second groove spaced apart on one side of the limiting device, it is possible for the operator to easily apply glue to fix the hollow optical fiber. More importantly, the first groove and the second groove can be used to observe whether the laser has passed through the hollow optical fiber, so that the operator can adjust the incident angle of the laser according to the position of the laser and the hollow optical fiber, thereby improving the optical path coupling efficiency and accuracy. In addition, the optical path coupling device provided by the present invention has a simple structure, is easy to use and operate, and greatly improves the success rate of the laser-hollow optical fiber coupling process and the service life of the hollow optical fiber.

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This diagram illustrates a structural schematic of an optical path coupling device according to some embodiments of the present invention from one perspective.

[0028] Figure 2 This diagram illustrates a structural schematic of a limiting device in an optical path coupling device according to some embodiments of the present invention, from one perspective.

[0029] Figure 3 This diagram illustrates a structural schematic of a limiting device in an optical path coupling device according to some embodiments of the present invention from another perspective.

[0030] Figure 4 It shows Figure 3 Sectional view of section AA;

[0031] Figure 5 This diagram illustrates a structural schematic of a limiting device in an optical path coupling device according to some embodiments of the present invention from another perspective.

[0032] Figure 6 It shows Figure 5 Sectional view of the middle BB section;

[0033] Figure 7 This diagram illustrates a structural schematic of an optical path coupling device provided by some embodiments of the present invention from another perspective;

[0034] Figure 8 It shows Figure 7 Cross-sectional view of the central CC section.

[0035] Explanation of key component symbols:

[0036] 100-Limiting device; 110-First groove; 120-Second groove; 130-Airflow channel; 200-Box; 300-Outlet window; 400-Hollow optical fiber; 410-First through hole; 500-First connecting structure; 600-Second connecting structure; 700-Inlet window; 800-Reflector; 140-Leaning groove; 900-Position adjuster; 1000-Lens; 1100-Guide tube; 1200-Support base; 1300-Transparent plate. Detailed Implementation

[0037] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0038] It should be noted that when an element is said to be "fixed" to another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly" on another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0039] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the template description is for the purpose of describing particular embodiments only and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] like Figures 1 to 8 As shown, some embodiments of the present invention provide an optical path coupling device, which is mainly used to improve the success rate of laser coupling with hollow optical fiber, extend the service life of hollow optical fiber, reduce experimental costs, and improve experimental efficiency.

[0043] The optical path coupling device includes a limiting device 100, a housing 200, a hollow optical fiber 400, and a reflector 800. It should be noted that the limiting device 100 provides a limiting effect on the hollow optical fiber 400, thereby improving the stability of the hollow optical fiber 400 within the limiting device 100. In this embodiment, the housing 200 is a vacuum chamber to ensure the collimation of the laser within the housing 200.

[0044] Along the first direction, the interior of the limiting device 100 defines an installation channel, which is a straight channel. Simultaneously, a first groove 110, a second groove 120, and at least one airflow channel 130 are provided on one side of the limiting device 100, communicating with the installation channel. It is understood that the number of airflow channels 130 can be any number of one, two, or more, and can be specifically set according to actual conditions.

[0045] Specifically, in this embodiment, the first groove 110 and the second groove 120 are respectively disposed at both ends of the installation channel, and the groove opening of the first groove 110 is perpendicular to the first direction, and the groove opening of the second groove 120 is perpendicular to the first direction.

[0046] It should be noted that the first direction refers to the axial direction of the installation channel.

[0047] In addition, the airflow channel 130 can be disposed on either side of the limiting device 100, and the airflow channel 130 is disposed at intervals between the first groove 110 and the second groove 120, so that external gas can enter the installation channel through the airflow channel 130.

[0048] In this embodiment, the housing 200 is disposed on one side of the limiting device 100. The housing 200 is located on the side of the first groove 110 opposite to the second groove 120. Specifically, the housing 200 is disposed in the first direction. An exit window 300 is provided on one side of the housing 200 so that the laser entering the housing 200 can be emitted through the exit window 300.

[0049] The hollow optical fiber 400 is inserted into the installation channel. A first through hole 410 is provided on one side of the hollow optical fiber 400. The airflow channel 130 is connected to the hollow optical fiber 400 through the first through hole 410. The outer wall of the vacuum optical fiber is in contact with the inner wall of the installation channel to improve the stability of the hollow optical fiber 400 in the installation channel.

[0050] It should be noted that the number of first through holes 410 can be one, two or more, and can be set according to the actual situation.

[0051] Preferably, the diameter of the first through hole 410 is equal to the diameter of the airflow channel 130, and the axis of the first through hole 410 coincides with the axis of the airflow channel 130.

[0052] In this embodiment, the number of first through holes 410 is equal to the number of airflow channels 130, and one first through hole 410 corresponds to one airflow channel 130.

[0053] In order to enable the staff to see whether the laser has entered the hollow optical fiber 400 through the first groove 110 and the second groove 120 during the test, the length of the hollow optical fiber 400 along the first direction is greater than or equal to the length of the installation channel.

[0054] Preferably, the length of the hollow optical fiber 400 along the first direction is greater than the length of the installation channel. That is, a portion of the hollow optical fiber 400 near the first groove 110 is located in the first groove 110, and a portion of the hollow optical fiber 400 near the second groove 120 is located in the second groove 120. This allows the operator to determine whether the laser has entered the hollow optical fiber 400 through the first groove 110 and the second groove 120, and at the same time, it is easy to adjust the incident angle of the laser, thereby improving experimental efficiency.

[0055] like Figure 1 , Figure 7 and Figure 8As shown, in some embodiments of the present invention, the optical path coupling device further includes a first connecting structure 500 and a second connecting structure 600. The housing 200 and the first groove 110 are connected through the first connecting structure 500. It should be noted that the first connecting structure 500 and the first groove 110 are sealed together. Both the first connecting structure 500 and the second connecting structure 600 are through-hole connecting structures.

[0056] Specifically, along the first direction, one end of the first connecting structure 500 passes through the limiting device 100 so that the first connecting structure 500 communicates with the first groove 110, and the other end of the first connecting structure 500 passes through the side wall of the box 200 so as to communicate with the cavity inside the box 200.

[0057] Furthermore, one end of the second connecting structure 600 communicates with the second groove 120. Specifically, along the first direction, the second connecting structure 600 is disposed on the side of the limiting device 100 near the second groove 120, and one end of the second connecting structure 600 passes through the limiting device 100 to communicate with the second groove 120. Simultaneously, an entrance window 700 is provided at the other end of the second connecting structure 600 to seal one end of the second connecting structure 600, forming a sealed structure, allowing external laser light to enter the second connecting structure 600 through the entrance window 700.

[0058] It should be noted that the axes of the first connecting structure 500, the second connecting structure 600, and the hollow optical fiber 400 coincide with the axis of the mounting channel. This allows the laser to pass sequentially through the second connecting structure 600, the second groove 120, the hollow optical fiber 400, the first groove 110, and the first connecting structure 500 along the first direction before entering the interior of the housing 200.

[0059] Specifically, in this embodiment, both the first connecting structure 500 and the second connecting structure 600 are vacuum connecting tubes or other vacuum-sealed structures.

[0060] By placing the reflector 800 in the housing 200, the laser light incident through the incident window 700 into the first groove 110 can pass through the hollow optical fiber 400 in the mounting channel and the second groove 120, be reflected by the reflector 800, and then exit from the exit window 300. This allows for power and spot measurement outside the housing 200, thereby determining whether the laser light has been efficiently coupled into the hollow optical fiber 400.

[0061] In this embodiment, by providing a first groove 110 and a second groove 120 on one side of the limiting device 100, the operator can monitor whether the laser hits the incident end face of the hollow optical fiber 400 through the first groove 110 and the second groove 120 during the test, thereby providing a reliable criterion for adjusting the coupling of the hollow optical fiber 400, which can greatly improve the efficiency and success rate of the femtosecond laser coupling into the hollow optical fiber 400.

[0062] In this embodiment, the shape of the first groove 110 and the second groove 120 can be any one of a polygonal prism, a sphere, an ellipsoid, or an irregular shape, and can be specifically set according to the actual situation.

[0063] like Figure 2 , Figure 5 and Figure 6 As shown, in some embodiments of the present invention, the airflow channel 130 is in two sets, the two sets of airflow channels 130 are arranged at intervals, and both sets of airflow channels 130 are located between the first groove 110 and the second groove 120.

[0064] Since the number of first through holes 410 is equal to the number of airflow channels 130, that is, in this embodiment, there are two first through holes 410, one of which is connected to one airflow channel 130 and the other is connected to another airflow channel 130. The axis of the first through hole 410 coincides with the axis of the airflow channel 130, and the aperture of the first through hole 410 is equal to the aperture of the airflow channel 130. This allows external gas to enter the hollow optical fiber 400 through the airflow channel 130 and the first through hole 410, thereby generating high-order harmonics (HHG). The coherent deep ultraviolet / soft X-ray source generated by the high-order harmonic process can be used for valence electron and inner shell electron dynamics measurement, exploration of material structure and band characteristics, manipulation of magnetic material properties, and mesa deep ultraviolet lithography research.

[0065] It should be noted that the experimental process for generating HHG involves focusing a femtosecond laser beam to 10... 14 -10 16 W / cm 2 The range interacts with the gas to generate a coherent deep ultraviolet / soft X-ray source through a high-order nonlinear process.

[0066] Preferably, in some embodiments, a guide tube 1100 is provided on one side of the limiting device 100 where the airflow channel 130 is provided. One end of the guide tube 1100 is sealed to the limiting device 100, and the number of guide tubes 1100 is equal to the number of airflow channels 130. One guide tube 1100 is connected to one airflow channel 130, and the axis of the guide tube 1100 coincides with the axis of the airflow channel 130. The axis of the airflow channel 130 is perpendicular to the first direction.

[0067] It should be noted that in this embodiment, the two airflow channels 130 are located on the same side of the limiting device 100. In other embodiments, the two airflow channels 130 are located on opposite sides of the limiting device 100. The specific configuration can be determined according to the actual situation.

[0068] In some embodiments, the angle between the axis of the airflow channel 130 and the axis of the mounting channel is an acute angle.

[0069] like Figure 4 and Figure 6 As shown, in some embodiments of the present invention, one end of the hollow optical fiber 400 is located in the first groove 110, and the other end of the hollow optical fiber 400 is located in the second groove 120.

[0070] It is understood that at least one end of the hollow optical fiber 400 is placed in the first groove 110, so that the staff can observe the part of the hollow optical fiber 400 placed in the first groove 110 through the opening of the first groove 110. This allows the staff to clearly observe whether the laser has passed through the hollow optical fiber 400 or when the laser is incident on the hollow optical fiber 400, thereby effectively improving the accuracy and efficiency of the experiment.

[0071] It should be noted that the existing adhesive coating process is divided into two parts. First, adhesive is applied to the hollow optical fiber 400 through the side groove. Then, after the adhesive has solidified (generally 24 hours), the vacuum fixture of the hollow optical fiber 400 is erected and the adhesive is applied through the vacuum tube. If the vacuum fixture is erected and the adhesive is applied through the vacuum tube before the adhesive has solidified, the hollow optical fiber 400 may become misaligned or slip, causing the air inlet, which is on the order of hundreds of micrometers, to shift in position. This could lead to a decrease in air intake efficiency and experimental failure.

[0072] Furthermore, the connection end between the first groove 110 and the mounting channel is provided with an adhesive to form a first sealing structure at one end of the mounting channel. This first sealing structure surrounds the circumference of the hollow optical fiber 400, sealing the first groove 110 with the end of the mounting channel near the first groove 110 to prevent gas in the airflow channel 130 from entering the first groove 110 through the mounting channel. Simultaneously, the connection end between the second groove 120 and the mounting channel is provided with an adhesive to form a second sealing structure at the other end of the mounting channel. This second sealing structure surrounds the circumference of the hollow optical fiber 400, sealing the second groove 120 with the end of the mounting channel near the second groove 120 to prevent gas in the airflow channel 130 from entering the second groove 120 through the mounting channel.

[0073] By setting the first groove 110 and the second groove 120 on the limiting device, it is possible to facilitate the application of adhesive through the first groove 110 and the second groove 120 when the limiting device 100 is placed horizontally. This allows the adhesive application process to be completed without changing the position of the hollow optical fiber 400. This not only improves the accuracy of adhesive application but also reduces the number of steps, increases the efficiency of adhesive application, and shortens the waiting time after adhesive application, thereby ensuring the accuracy of the experiment.

[0074] Furthermore, a first mounting platform is provided at the edge of the opening of the first groove 110, and a second mounting platform is provided at the edge of the opening of the second groove 120. A transparent plate is provided at the opening of the first groove 110, and the transparent plate 1300 is disposed on the first mounting platform to seal the opening of the first groove 110, thereby defining the first groove 110 as a first sealed cavity. Similarly, a transparent plate 1300 is provided at the opening of the second groove 120, and the transparent plate is disposed on the second mounting platform to seal the opening of the second groove 120, thereby defining the second groove 120 as a second sealed cavity. This prevents external air from entering the first groove 110 and the second groove 120, while allowing personnel to observe the laser activity in the first groove 110 and the second groove 120 through the transparent plates.

[0075] It should be noted that the transparent plate 1300 described in this embodiment includes any one of transparent glass, transparent acrylic sheet or transparent silicone, and can be specifically set according to the actual situation.

[0076] like Figure 2 , Figure 3 , Figure 4 and Figure 6As shown, in some embodiments of the present invention, a clearance groove 140 is provided on one side of the limiting device 100. It should be noted that the clearance groove 140 is located between the two sets of airflow channels 130, and there is a gap between the clearance groove 140 and the airflow channel 130.

[0077] The installation channel is divided into a first segment and a second segment by the clearance groove 140. It can be understood that the first segment and the second segment of the installation channel are connected by the clearance groove 140, and the hollow optical fiber 400 passes through the clearance groove 140, that is, a part of the hollow optical fiber 400 is located in the clearance groove 140.

[0078] Furthermore, in some embodiments of the present invention, the clearance groove 140 is provided with an adhesive, which wraps around a portion of the hollow optical fiber 400 and forms a third sealing structure in the clearance groove 140 to seal the clearance groove 140. At the same time, the third sealing structure seals the portion of the clearance groove 140 that communicates with the airflow channel 130. This third sealing structure can wrap and seal the hollow optical fiber 400 located in the clearance groove 140, preventing external gas from entering the installation channel through the clearance groove 140.

[0079] Furthermore, by providing colloid in the relief groove 140, the colloid can limit and fix the hollow optical fiber 400, thereby preventing the hollow optical fiber 400 from shifting in the installation channel and improving the stability of the hollow optical fiber 400 in the installation channel.

[0080] The limiting structure is sealed by a first sealing structure, a second sealing structure, and a third sealing structure to improve the accuracy of the test process.

[0081] It should be noted that, in some embodiments of the present invention, the colloid is a transparent vacuum adhesive.

[0082] like Figure 8 As shown, in some embodiments of the present invention, a position adjuster 900 is provided inside the housing 200. The position adjuster 900 is located at the bottom inside the housing 200 and the reflector 800 is connected to the output end of the position adjuster 900 so as to control the reflector 800 to move along the first direction through the output end of the position adjuster 900. Specifically, when the laser is incident on the reflector 800, the position of the reflector is adjusted by the position adjuster 900 to adjust the position of the laser reflected by the reflector 800 in the exit window 300, so that the reflected laser can be exported from the exit window 300.

[0083] Optionally, in some embodiments, the position adjuster 900 is a sliding component, which includes a slide rail (not shown) and a slider (not shown).

[0084] The slide rail is arranged along the first direction, and the slider is slidably connected to the slide rail. It can be understood that the slider can slide along the slide rail in the first direction.

[0085] By connecting the reflector 800 to the slider, the slider drives the reflector 800 to move along the first direction, thereby adjusting the position of the laser reflected by the reflector 800 after entering the housing 200 through the first connection structure 500, so that the laser reflected by the reflector 800 can be emitted through the exit window 300.

[0086] like Figure 1 , Figure 7 and Figure 8 As shown, in some embodiments of the present invention, the optical path coupling device further includes a support base 1200, which is disposed on one side of the limiting device 100 to provide support for the limiting device 100 and improve the stability of the limiting device 100.

[0087] like Figure 1 As shown, in some embodiments of the present invention, the entrance window 700 and the exit window 300 are designed according to the visible light band. Specifically, the entrance window 700 and the exit window 300 can be made of glass or fused silica. The shape of the entrance window 700 and the exit window 300 can be any one of polygon, circle, ellipse or irregular shape, and can be specifically set according to the actual situation.

[0088] like Figure 1 , Figure 7 and Figure 8 As shown, in some embodiments of the present invention, along the first direction, a lens 1000 is provided on the side of the entrance window 700 away from the housing 200, and the laser is focused by the lens 1000 so that the laser after being focused by the lens 1000 can pass through the entrance window 700 and through the hollow optical fiber 400.

[0089] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0090] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0091] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An optical path coupling device, characterized in that, include: A limiting device, along a first direction, defines an installation channel within its interior. One side of the limiting device is provided with a first groove, a second groove, and at least one airflow channel communicating with the installation channel. The first groove and the second groove are respectively disposed at both ends of the installation channel, and the airflow channel is spaced between the first groove and the second groove. The enclosure has a projection window on one side; A hollow optical fiber is inserted into the installation channel. A first through hole is opened on one side of the hollow optical fiber, and the airflow channel is connected to the hollow optical fiber through the first through hole. A first connecting structure and a second connecting structure, wherein the housing is connected to the first groove through the first connecting structure, one end of the second connecting structure is connected to the second groove, and the other end of the second connecting structure is provided with an entrance window; A reflector is disposed in the housing so that a laser beam incident through the entrance window into the first groove can pass through the mounting channel and the second groove, be reflected by the reflector, and exit through the exit window.

2. The optical path coupling device according to claim 1, characterized in that, Along the first direction, the first groove and the second groove are respectively disposed at both ends of the mounting channel.

3. The optical path coupling device according to claim 1, characterized in that, The airflow channels are in two sets, and the two sets of airflow channels are arranged alternately. Both sets of airflow channels are located between the first groove and the second groove.

4. The optical path coupling device according to claim 1, characterized in that, One end of the hollow optical fiber is located in the first groove, and the other end of the hollow optical fiber is located in the second groove.

5. The optical path coupling device according to claim 1, characterized in that, The limiting device has a clearance groove on one side, which is located between the two sets of airflow channels to divide the installation channel into a first section and a second section. The hollow optical fiber is inserted into the clearance groove.

6. The optical path coupling device according to claim 1, characterized in that, The connection end between the first groove and the mounting channel is provided with colloid to form a first sealing structure at one end of the mounting channel; The connection end between the second groove and the mounting channel is provided with an adhesive to form a second sealing structure at the other end of the mounting channel.

7. The optical path coupling device according to claim 5, characterized in that, The relief groove is provided with a colloid to form a third sealing structure in the relief groove, thereby sealing the relief groove through the third sealing structure; The third sealing structure is wrapped around a portion of the hollow optical fiber.

8. The optical path coupling device according to any one of claims 1 to 7, characterized in that, The housing is equipped with a position adjuster, and the reflector is connected to the output end of the position adjuster so as to control the reflector to move along the first direction through the output end of the position adjuster.

9. The optical path coupling device according to any one of claims 1 to 7, characterized in that, The axes of the hollow optical fiber, the mounting channel, the first connecting structure, and the second connecting structure all coincide.

10. The optical path coupling device according to any one of claims 1 to 7, characterized in that, Along the first direction, a lens is provided on the side of the entrance window opposite to the housing.

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