Electron gun

Abstract

The utility model relates to the technical field of electron guns, and provides an electron gun which comprises an electron gun main body, an electron emitter, a first optical fiber connecting piece and a grid electrode. A first optical fiber is arranged in the electron gun body. The electron emitter is arranged on the electron gun body and comprises a second optical fiber and an electron excitation layer, the first optical fiber is connected with the second optical fiber, and the electron excitation layer is arranged on a laser emitting path of the second optical fiber. The first optical fiber connecting piece comprises a first connecting piece arranged on the electron gun body and a second connecting piece arranged on the electron emitter, and the first connecting piece and the second connecting piece are detachably connected with the electron emitter and the electron gun body in a matched mode. The grid electrode is arranged on the electron emitting side of the electron emitter. The electron gun has the advantages of being simple in structure, good in stability, convenient to replace the electron emitter and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of electron guns, in particular to an electron gun. Background Art

[0002] An electron gun is a device that can emit an electron beam. Electron emitters are mainly divided into thermal emission, field emission, and photoemission according to the excitation method. Thermal emission mainly uses metal materials. When heated to thousands of degrees Celsius, electrons are thermally excited and detach from the surface of the material to form vacuum electrons. Field emission mainly uses metal needle tips. Under the action of a strong electric field applied from the outside, a tip discharge effect is generated. Photoemission uses metal materials as photocathodes and uses laser irradiation to excite the photocathode material, thereby generating electrons. In traditional technology, photoemission electron guns use an optical window on the side of the electron gun to focus the free laser on the surface of the metal needle tip to excite electrons. However, this method requires modification of the instrument itself and uses a spatial optical path. The structure is complex, sensitive to environmental factors such as vibration, and has poor stability. Utility Model Content

[0003] Based on this, an embodiment of the present application provides an electron gun with good stability and replaceable electron emitters.

[0004] The present application provides an electron gun, comprising:

[0005] An electron gun body is provided with a first optical fiber.

[0006] An electron emitter is provided on the electron gun body, the electron emitter comprises a second optical fiber and an electron excitation layer, the first optical fiber and the second optical fiber are connected, and the electron excitation layer is provided on the laser emission path of the second optical fiber.

[0007] The first optical fiber connector includes a first connector provided on the electron gun body and a second connector provided on the electron emitter. The first connector and the second connector cooperate to detachably connect the electron emitter and the electron gun body.

[0008] A gate is provided on the electron emission side of the electron emitter.

[0009] In some embodiments, the second connector includes an LC fiber optic connector, an FC fiber optic connector, an SC fiber optic connector, an ST fiber optic connector, an MU fiber optic connector, or an MT-RJ fiber optic connector.

[0010] In some embodiments, the electron gun body includes a shell, and a grid connector, a cathode connector, and a second optical fiber connector provided on the shell; the grid connector is conductively connected to the grid, the cathode connector is conductively connected to the electron emitter, and the second optical fiber connector is connected to the first optical fiber.

[0011] In some embodiments, the electron emitter further includes a first optical fiber fixing member, and the first optical fiber fixing member is sleeved on the second optical fiber.

[0012] In some embodiments, the electron emitter further includes a first conductive layer and a second conductive layer, wherein the first conductive layer is disposed on a surface of the second optical fiber close to the electron excitation layer and in contact with the electron excitation layer, and the second conductive layer is disposed on a surface of the first optical fiber fixing member, and the first conductive layer and the second conductive layer are electronically conductive.

[0013] In some embodiments, the electron emitter further includes a third conductive layer, which is disposed at the connection between the second optical fiber and the first optical fiber fixture, and is used to connect the first conductive layer and the second conductive layer.

[0014] In some embodiments, the first optical fiber fixing member includes a first optical fiber ferrule and a positioning member, the second conductive layer is located on the surface of the first optical fiber ferrule, the second optical fiber is inserted into the first optical fiber ferrule, and the positioning member is sleeved on the outside of the first optical fiber ferrule.

[0015] In some embodiments, the electron emitter further includes a second optical fiber fixing member, which includes a second optical fiber ferrule and a positioning connector. The second optical fiber ferrule is sleeved on the side of the second optical fiber away from the electron excitation layer, and the positioning connector is sleeved on the outside of the second optical fiber ferrule and is detachably connected to the positioning member.

[0016] In some embodiments, the second optical fiber fixing member further includes an elastic member and a blocking member, wherein the blocking member is sleeved on a side of the second optical fiber ferrule close to the first optical fiber ferrule, one side of the blocking member abuts against the positioning member, and the opposite side abuts against the positioning connecting member, and the elastic member is sleeved on the blocking member.

[0017] In some embodiments, the first connecting member includes a fiber optic flange, the second connecting member includes a tightening nut, the tightening nut is sleeved on the positioning connecting member, and a blocking structure is provided on the outer surface of the second connecting member, the blocking structure is used to abut against the tightening nut to tighten and fix the electron emitter.

[0018] Compared with the traditional technology, the present invention has at least the following beneficial effects:

[0019] In this application, the electron gun uses optical fiber to transmit laser light, wherein a first optical fiber is provided in the electron gun body and can be connected to the laser source. The electron emitter has a second optical fiber that can be connected to the first optical fiber to transmit the laser light generated by the laser source to the electron excitation layer to excite and form electrons. Compared with the traditional technology of introducing a spatial optical path, the present application uses optical fiber to transmit laser light, which is not only simple in structure but also has better stability. Furthermore, in this application, the electron emitter and the electron gun body are detachably connected using a first optical fiber connector, which facilitates the replacement of the electron emitter. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of an electron gun provided in one embodiment of the present invention;

[0021] Figure 2 This is a schematic structural diagram of an electron emitter provided in one embodiment of the present invention;

[0022] Figure 3 This is a partially enlarged view of an electron emitter provided in one embodiment of the present utility model.

[0023] Among them, 100 is the electron gun body; 110 is the first optical fiber; 120 is the shell; 130 is the grid connector; 140 is the cathode connector; 150 is the second optical fiber connector; 200 is the electron emitter; 210 is the second optical fiber; 220 is the electron excitation layer; 230 is the first conductive layer; 240 is the second conductive layer; 250 is the third conductive layer; 260 is the first optical fiber fixing part; 261 is the first optical fiber ferrule; 262 is the positioning part; 270 is the second optical fiber fixing part; 271 is the second optical fiber ferrule; 272 is the positioning connector; 273 is the blocking part; 274 is the elastic part; 280 is the auxiliary layer; 300 is the first optical fiber connector; 310 is the first connector; 320 is the second connector; 400 is the grid. DETAILED DESCRIPTION

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings, embodiments and examples. These embodiments and examples are only used to illustrate the present invention and are not used to limit the scope of the present invention. The purpose of providing these embodiments and examples is to make the understanding of the disclosure of the present invention more thorough and comprehensive. It should also be understood that the present invention can be implemented in many different forms and is not limited to the embodiments and examples described herein. Those skilled in the art can make various changes or modifications without violating the connotation of the present invention, and the equivalent forms obtained also fall within the scope of protection of the present invention. In addition, in the description below, a large number of specific details are given in order to provide a more comprehensive understanding of the present invention. It should be understood that the present invention can be implemented without one or more of these details.

[0025] It should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of this utility model, unless otherwise expressly specified or limited, the terms "connected," "connect," "fixed," and "disposed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. A person of ordinary skill in the art will be able to understand the meaning of the above terms in this utility model based on the specific circumstances.

[0027] In this utility model, the terms "optionally," "optional," and "optional" mean optional or dispensable, i.e., they refer to either option being selected from two parallel options: "with" or "without." If a technical solution contains multiple "options," each "optional" shall be considered independent unless otherwise specified and there are no contradictions or constraints.

[0028] In the present utility model, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0029] In this utility model, the terms "first," "second," etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance or quantity, nor as implicitly indicating the importance or quantity of the technical features indicated. Furthermore, the terms "first," "second," etc. serve only as non-exhaustive enumeration and description and should not constitute a closed-ended limitation on quantity.

[0030] All documents mentioned in this utility model are cited as references in this utility model, just as each document is cited as a reference separately. Unless they conflict with the utility model purpose and / or technical solution of this utility model, the cited documents involved in this utility model are cited with all their contents and all their purposes. When the utility model involves cited documents, the definitions of relevant technical features, terms, nouns, phrases, etc. in the cited documents are also cited. When the utility model involves cited documents, the examples and preferred methods of the cited relevant technical features can also be incorporated into this utility model as references, but are limited to the ability to implement this utility model. It should be understood that when the cited content conflicts with the description in this utility model, this utility model shall prevail or be modified adaptively according to the description of this utility model.

[0031] Conventional light-emitting electron guns use a spatial optical path, resulting in a complex structure. This requires a high degree of matching between the spatial optical path and the photocathode, making it difficult to disassemble or replace either the spatial optical path or the photocathode.

[0032] Based on this, the present application provides an electron gun, such as Figure 1 、 Figure 2 and Figure 3 As shown, the electron gun includes an electron gun body 100 , an electron emitter 200 , a first optical fiber connecting member 300 and a grid 400 .

[0033] The electron gun body 100 is provided with a first optical fiber 110. Figure 3 As shown, the electron emitter 200 is disposed on the electron gun body 100. The electron emitter 200 includes a second optical fiber 210 and an electron excitation layer 220. The first optical fiber 110 and the second optical fiber 210 are connected. The electron excitation layer 220 is disposed on the laser emission path of the second optical fiber 210. The gate 400 is disposed on the electron emission side of the electron emitter 200.

[0034] The first optical fiber connector 300 includes a first connector 310 disposed on the electron gun body 100 and a second connector 320 disposed on the electron emitter 200 . The first connector 310 and the second connector 320 cooperate to detachably connect the electron emitter 200 and the electron gun body 100 .

[0035] In this application, the electron gun utilizes optical fiber to transmit laser light. The electron gun body 100 is provided with a first optical fiber 110 that can be connected to a laser source. The electron emitter 200 includes a second optical fiber 210 that can connect to the first optical fiber 110, transmitting laser light generated by the laser source to the electron excitation layer 220, thereby exciting the formation of electrons. Compared to conventional techniques that employ spatial optical paths, this application utilizes optical fiber to transmit laser light, resulting in a simpler structure and greater stability. Furthermore, in this application, the electron emitter 200 and the electron gun body 100 are detachably connected using a first optical fiber connector 300, facilitating replacement of the electron emitter 200.

[0036] The laser emitted from the second optical fiber 210 of the present application can be irradiated on the electron excitation layer 220, so that the electron excitation layer 220 is excited by the laser and emits electrons. In addition, the present application adopts low-dimensional materials such as zero-dimensional materials, one-dimensional materials or two-dimensional materials as the material of the electron excitation layer 220. The low-dimensional material has an atomic-level thickness, and the back-incident electrons can be emitted without being transmitted through the body, and the electron emission efficiency is high; and the low-dimensional material has no dangling bonds, is stable in nature and has a high melting point, is not easy to damage, can be applied to high-power excitation scenarios, and has the characteristics of good stability and long service life. It should be noted that the low-dimensional material in the present application refers to a zero-dimensional material, a one-dimensional material or a two-dimensional material.

[0037] In addition, low-dimensional materials can be directly integrated with optical fibers, which transmit lasers and, as a carrier of low-dimensional materials, can provide a stable excitation source with adjustable wavelength, polarization, and optical mode. It can be applied to different application scenarios without the need for complex optical paths and has the characteristics of small size and high integration.

[0038] Zero-dimensional materials typically have discrete energy levels. Under laser excitation, electrons tunnel primarily through these discrete energy levels, generating highly monochromatic electrons with concentrated energy and minimal energy dispersion. One-dimensional materials, characterized by a small radius of curvature (nanometer scale), can enhance light-matter interactions and provide a large field enhancement factor, ensuring multiphoton emission and light field emission, and are therefore suitable for applications requiring high-brightness electron sources. Two-dimensional materials are characterized by their atomic-layer thickness. Lasers interacting with these materials have little impact on the light transmission pattern, resulting in high stability. Furthermore, the excited electrons can be emitted directly without scattering within the material, ensuring the purity of the emitted electrons and an extremely narrow pulse width.

[0039] The zero-dimensional material in the present application refers to a substance with a three-dimensional size in nanometer scale in space, and electrons cannot move freely; the one-dimensional material refers to a material with electrons moving freely in one non-nanometer scale direction; the two-dimensional material refers to a material with electrons moving freely in two non-nanometer scale directions (i.e., planar motion). The nanometer scale refers to 0.1 nm to 100 nm. The zero-dimensional material, the one-dimensional material and the two-dimensional material can be excited to emit electrons under the action of laser excitation.

[0040] In some embodiments, the zero-dimensional material includes at least one of quantum dots, fullerenes, NV color centers and nanocrystals. The NV color center refers to a nitrogen vacancy color center, and the quantum dots include at least one of carbon quantum dots, CdSe colloidal quantum dots and GaAs semiconductor quantum dots.

[0041] In some embodiments, the one-dimensional material includes at least one of nanotubes, nanoribbons and nanowires. Optionally, the nanowires include at least one of gold nanowires, semiconductor (GaAs) nanowires and Te quantum wires; the nanotubes include carbon nanotubes.

[0042] In some embodiments, the two-dimensional material includes at least one of graphene, black phosphorus, transition metal chalcogenide and hexagonal boron nitride. Optionally, the transition metal chalcogenide includes at least one of WS2, WSe2 and NbSe2.

[0043] It can be understood that, as shown in Figure 1 The first connecting piece 310 and the second connecting piece 320 have detachable matching structures, i.e., the first connecting piece 310 and the second connecting piece 320 are correspondingly matched, and the first connecting piece 310 with different structures has a correspondingly matched second connecting piece 320. In some embodiments, the second connecting piece 320 includes an LC optical fiber connecting piece, an FC optical fiber connecting piece, an SC optical fiber connecting piece, an ST optical fiber connecting piece, an MU optical fiber connecting piece or an MT-RJ optical fiber connecting piece.

[0044] In some embodiments, as shown in Figure 1 The electron gun body 100 includes a shell 120, and a grid connecting piece 130, a cathode connecting piece 140 and a second optical fiber connecting piece 150 arranged on the shell 120; the grid connecting piece 130 is in conductive communication with the grid 400, the cathode connecting piece 140 is in conductive communication with the electron emitter 200, and the second optical fiber connecting piece 150 is connected with the first optical fiber 110.

[0045] In some embodiments, the first optical fiber 110 and the second optical fiber 210 are independently single-mode optical fibers, multi-mode optical fibers, polarization maintaining optical fibers or multi-core optical fibers.

[0046] In some embodiments, the housing 120 has a cavity therein, and an insulating seal is disposed on the housing 120. Optionally, the electron emitter 200 is removably mounted on the insulating seal via a first optical fiber connector 300. The gate connector 130, cathode connector 140, and second optical fiber connector 150 are each disposed on the housing 120 at the cavity. Furthermore, optionally, the gate connector 130 is connected to the gate 400 via a gate connection wire, and the cathode connector 140 is connected to the electron emitter 200 via a cathode connection wire. The gate connection wire, cathode connection wire, and first optical fiber 110 are each integrated into the insulating seal and pass through the cavity to connect to the gate connector 130, cathode connector 140, and second optical fiber connector 150, respectively. It is understood that the cavity can be a high-pressure environment to facilitate assembly of the various connection wires and optical fibers. After installation, the cavity is filled with insulating material to further improve the stability of the electron gun.

[0047] In some embodiments, the gate connector 130 may be a gate pin, the cathode connector 140 may be a cathode pin, and the second optical fiber connector 150 may be an optical fiber flange.

[0048] In some embodiments, as Figure 2 As shown, the electron emitter 200 further includes a first optical fiber fixing member 260, which is sleeved on the second optical fiber 210. The present application fixes the optical fiber by providing the first optical fiber fixing member 260, which not only improves the stability of the optical fiber but also improves the convenience of operation during the assembly process.

[0049] In some embodiments, as Figure 3 As shown, electron emitter 200 further includes a first conductive layer 230 and a second conductive layer 240. First conductive layer 230 is disposed on a surface of second optical fiber 210 near electron excitation layer 220 and in contact with electron excitation layer 220. Second conductive layer 240 is disposed on a surface of first optical fiber fixture 260, and first conductive layer 230 and second conductive layer 240 are electrically conductive. This application utilizes first conductive layer 230 and second conductive layer 240 to achieve electronic conductivity in electron excitation layer 220, thus avoiding the problem of electron excitation layer 220 being too small and difficult to connect due to its small size.

[0050] It will be appreciated that, in the present application, the connecting components in the electron emitter 200 are all conductive components. Therefore, electron conduction to the electron excitation layer 220 can be achieved by directly connecting the cathode connector 140 to the conductive components of the electron emitter 200, further simplifying the structure of the electron gun. If the connecting components in the electron emitter 200 are not conductive components, the cathode connector 140 can be connected to the first optical fiber fixture 260 to also achieve electron conduction to the electron excitation layer 220.

[0051] In some embodiments, Figure 3 As shown, the electron emitter 200 further includes a third conductive layer 250, which is disposed at the junction of the second optical fiber 210 and the first optical fiber fixture 260. The third conductive layer 250 is used to connect the first conductive layer 230 and the second conductive layer 240. To further ensure the electron conduction effect of the electron excitation layer 220 in the electron emitter 200, the third conductive layer 250 is disposed at the junction of the first optical fiber fixture 260 and the second optical fiber 210, effectively ensuring the electron conduction effect of the first conductive layer 230 and the second conductive layer 240.

[0052] In some embodiments, as Figure 2 As shown, the first optical fiber fixture 260 includes a first optical fiber ferrule 261 and a positioning member 262. The second conductive layer 240 is located on the surface of the first optical fiber ferrule 261. The second optical fiber 210 is inserted into the first optical fiber ferrule 261, and the positioning member 262 is sleeved on the exterior of the first optical fiber ferrule 261. Optionally, the first optical fiber ferrule 261 can be a ceramic optical fiber ferrule. The positioning member 262 can be a locking positioning shaft. The present application utilizes the positioning member 262 to further position the second optical fiber 210, and the use of the positioning member 262 can improve the assembly convenience of the second optical fiber 210.

[0053] In some embodiments, Figure 2 As shown, the electron emitter 200 also includes a second optical fiber fixture 270, which includes a second optical fiber ferrule 271 and a positioning connector 272. The second optical fiber ferrule 271 is mounted on the side of the second optical fiber 210 away from the electron excitation layer 220. The positioning connector 272 is mounted on the exterior of the second optical fiber ferrule 271 and is detachably connected to the positioning member 262. Optionally, the second optical fiber ferrule 271 may be a ceramic optical fiber ferrule. The positioning connector 272 and the positioning member 262 may be detachably connected by a thread. By providing the second optical fiber ferrule 271 on the second optical fiber 210 of the electron emitter 200, the present application improves the ease of assembly between the electron emitter 200 and the electron gun body 100. Furthermore, the detachable connection between the positioning connector 272 and the positioning member 262 improves the overall structural stability of the electron emitter 200.

[0054] In some embodiments, Figure 2As shown, the second optical fiber fixture 270 further includes an elastic member 274 and a blocking member 273. The blocking member 273 is disposed on a side of the second optical fiber ferrule 271 adjacent to the first optical fiber ferrule 261. One side of the blocking member 273 abuts against the positioning member 262, and the opposite side abuts against the positioning connector 272. The elastic member 274 is disposed on the blocking member 273. The elastic member 274 may be a spring. By providing the blocking member 273 and the elastic member 274, elastically abutting against the positioning member 262 and the positioning connector 272, the present application improves safety during the assembly of the electron emitter 200.

[0055] In some embodiments, the first connecting member 310 includes a fiber optic flange, and the second connecting member 320 includes a tightening nut, which is sleeved on the positioning connecting member 272. The outer surface of the second connecting member 320 is provided with a blocking structure, which is used to resist the tightening nut and tighten and fix the electron emitter 200.

[0056] In some embodiments, Figure 3 As shown, electron emitter 200 may further include an auxiliary layer 280, which is laminated on the side of electron excitation layer 220 that is closer to second optical fiber 210; alternatively, auxiliary layer 280 is laminated on the side of electron excitation layer 220 that is farther from second optical fiber 210. The present application provides auxiliary layer 280 to support electron excitation layer 220 and improve the structural stability of electron excitation layer 220. For example, in the case of zero-dimensional and one-dimensional materials, auxiliary layer 280 is required for support.

[0057] In some embodiments, auxiliary layer 280 includes a conductive support layer or a transparent support layer. It is understood that the conductive support layer not only provides support for electron excitation layer 220 but also has a conductive function, thereby connecting electron excitation layer 220 to first conductive layer 230. The conductive support layer can be made of a conductive material such as metal or graphene. The transparent support layer can support electron excitation layer 220 and have good laser transmittance, and can be a silicon dioxide layer, for example.

[0058] Optionally, the auxiliary layer 280 has a thickness of 0.1 nm to 100 nm, for example, 0.1 nm, 0.5 nm, 1 nm, 5 nm, 10 nm, 20 nm, 30 nm, 40 nm, 50 nm, 60 nm, 70 nm, 80 nm, 90 nm or 100 nm.

[0059] Optionally, the light transmittance of the auxiliary layer 280 is ≥10%, for example, it can be 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90% or 100%.

[0060] In some embodiments, the thickness of electron excitation layer 220 is 0.1 nm to 100 nm, for example, 0.1 nm, 0.5 nm, 1 nm, 5 nm, 10 nm, 20 nm, 30 nm, 40 nm, 50 nm, 60 nm, 70 nm, 80 nm, 90 nm, or 100 nm.

[0061] In some embodiments, the electron gun further includes an anode (not shown), which is disposed on the electron emission side of the grid 400. It is understood that the anode can be disposed on the electron gun or as an independent anode disposed on the electron emission side of the electron gun.

[0062] It should be noted that in this application, the gate 400 is used to restrict the shape of the electron beam, and the anode is used to accelerate the electrons. When electrons are excited and emitted from the electron excitation layer 220, they interact with the electrostatic field established by the gate 400 and the electrons' own space charge, forming an electron beam with a specific shape, which is then emitted from the anode for use.

[0063] Exemplarily, a method for assembling the electron gun is provided, comprising the following steps:

[0064] Insert the second optical fiber 210 having the electron excitation layer 220 into the first optical fiber ferrule 261, and sleeve the positioning member 262 onto the outside of the first optical fiber ferrule 261; then sleeve the second optical fiber ferrule 271 having the blocking member 273 into the positioning connector 272, and then sleeve the second connector 320 onto the outside of the positioning connector 272. The positioning connector 272 and the positioning member 262 are connected and fixed to obtain the electron emitter 200 having the second connector 320;

[0065] The electron emitter 200 having the second connecting member 320 is connected to the first connecting member 310 on the electron gun body 100 , so that the first optical fiber 110 and the second optical fiber 210 are connected.

[0066] In summary, the electron gun in this application utilizes optical fiber to transmit laser light. A first optical fiber 110 is provided within the electron gun body 100, capable of connecting to a laser source. The electron emitter 200 includes a second optical fiber 210, capable of connecting to the first optical fiber 110 to transmit laser light generated by the laser source to the electron excitation layer 220, thereby exciting and generating electrons. Compared to conventional techniques that employ spatial optical paths, this application utilizes optical fiber to transmit laser light, resulting in a simpler structure and greater stability. Furthermore, the electron emitter 200 and the electron gun body 100 are detachably connected using a first optical fiber connector 300, facilitating replacement of the electron emitter 200.

[0067] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] The above embodiments merely illustrate several implementations of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the concept of the present invention, and these variations and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present utility model patent shall be determined by the appended claims.

Claims

1. An electron gun, characterized in that The electron gun comprises: an electron gun body, wherein a first optical fiber is disposed in the electron gun body; an electron emitter, the electron emitter being disposed on the electron gun body, the electron emitter comprising a second optical fiber and an electron excitation layer, the first optical fiber and the second optical fiber being connected, and the electron excitation layer being disposed on a laser emission path of the second optical fiber; a first optical fiber connector, the first optical fiber connector comprising a first connector provided on the electron gun body and a second connector provided on the electron emitter, the first connector and the second connector cooperating to detachably connect the electron emitter and the electron gun body; A gate is provided on the electron emission side of the electron emitter.

2. The electron gun according to claim 1, wherein The second connector includes an LC fiber optic connector, an FC fiber optic connector, an SC fiber optic connector, an ST fiber optic connector, an MU fiber optic connector, or an MT-RJ fiber optic connector.

3. The electron gun according to claim 1, wherein The electron gun body includes a shell, and a grid connector, a cathode connector and a second optical fiber connector provided on the shell; the grid connector is electrically connected to the grid, the cathode connector is electrically connected to the electron emitter, and the second optical fiber connector is connected to the first optical fiber.

4. The electron gun according to any one of claims 1 to 3, characterized in that The electron emitter further includes a first optical fiber fixing member, and the first optical fiber fixing member is sleeved on the second optical fiber.

5. The electron gun according to claim 4, wherein The electron emitter also includes a first conductive layer and a second conductive layer. The first conductive layer is arranged on a side surface of the second optical fiber close to the electron excitation layer and is in contact with the electron excitation layer. The second conductive layer is arranged on the surface of the first optical fiber fixing part, and the first conductive layer and the second conductive layer are electronically conductive.

6. The electron gun according to claim 5, wherein The electron emitter further includes a third conductive layer, which is disposed at the connection between the second optical fiber and the first optical fiber fixing member, and is used to connect the first conductive layer and the second conductive layer.

7. The electron gun according to claim 5, wherein The first optical fiber fixing member includes a first optical fiber ferrule and a positioning member, the second conductive layer is located on the surface of the first optical fiber ferrule, the second optical fiber is inserted into the first optical fiber ferrule, and the positioning member is sleeved on the outside of the first optical fiber ferrule.

8. The electron gun according to claim 7, wherein The electron emitter also includes a second optical fiber fixing part, which includes a second optical fiber core and a positioning connector. The second optical fiber core is sleeved on the side of the second optical fiber away from the electron excitation layer. The positioning connector is sleeved on the outside of the second optical fiber core and is detachably connected to the positioning part.

9. The electron gun according to claim 8, wherein The second optical fiber fixing member also includes an elastic member and a blocking member. The blocking member is sleeved on the side of the second optical fiber ferrule close to the first optical fiber ferrule. One side of the blocking member is against the positioning member, and the opposite side is against the positioning connecting member. The elastic member is sleeved on the blocking member.

10. The electron gun according to claim 8, wherein The first connecting member includes a fiber optic flange, and the second connecting member includes a tightening nut, which is sleeved on the positioning connecting member. A blocking structure is provided on the outer surface of the second connecting member, and the blocking structure is used to abut against the tightening nut to tighten and fix the electron emitter.

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