Helium-neon laser anti-pollution structure

Abstract

The utility model discloses an anti-pollution structure of a helium-neon laser, which comprises a cathode end valveable metal body and an anode end valveable metal body, the upper end of the anode end valveable metal body is provided with a glass material layer, and one side of the upper end of the anode end valveable metal body is connected with a tungsten rod. The tungsten rod penetrates through the glass material layer and extends to the upper end of the anode end valvable metal body, and a laser shell glass tube is connected between the cathode end valvable metal body and the anode end valvable metal body. According to the utility model, the inner surface of the anode end metal is covered by the glass material so as to prevent the anode end valveable metal from discharging to the cathode, the tungsten rod is additionally arranged as the anode of the laser, and the laser anode end valveable metal is not used as the electrode of the laser and does not participate in high-voltage discharge of the laser, so that the laser anode end valveable metal is not ionized and gasified; pollution caused by ionization and gasification of the anode end kovar metal can be effectively prevented, and the service life of the laser is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of helium-neon lasers, in particular to an anti-pollution structure for a helium-neon laser. Background Technique

[0002] The helium-neon laser is the first gas laser to achieve success in the world. Glass is a material with very good airtightness, and the helium-neon laser adopts a glass tube structure.

[0003] The traditional helium-neon laser adopts a full-glass manual blowing production process. It is difficult to ensure the consistency of the shape from the outer wall to the center at both ends of the tube. Moreover, there are structures such as exhaust holes and electrodes on the tube shells at both ends. When the temperature changes, due to the inconsistent end face shapes, the thermal expansion and contraction deformations are uneven, which causes changes in the parallelism of the laser cavity mirrors, resulting in fluctuations in the laser power and the light output direction, greatly affecting the performance of the helium-neon laser.

[0004] In order to improve the performance and stability of the helium-neon laser, a new type of assembled helium-neon laser with metal at both ends and a glass tube in the middle has replaced the traditional glass blowing structure and become the main structural form of helium-neon laser products.

[0005] The assembled helium-neon laser generally directly uses the valve metal at both ends as electrodes to provide high-voltage direct current for the laser. However, in this type of helium-neon laser structure, it is difficult to avoid the slight gasification of the valve metal at the anode end during the high-voltage starting and ion discharge processes of thousands of volts. The long-term accumulation of these gasified substances will pollute the gas and the capillary wall inside the laser, thus affecting the laser life. Therefore, we propose an anti-pollution structure for a helium-neon laser to solve the above problems. Content of the Utility Model

[0006] The purpose of the utility model is to solve the shortcomings existing in the prior art, and to propose an anti-pollution structure for a helium-neon laser.

[0007] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0008] A helium-neon laser anti-pollution structure includes a cathode end valve metal body and an anode end valve metal body. A glass material layer is provided at the upper end of the anode end valve metal body. One side of the upper end of the anode end valve metal body is connected with a tungsten rod. The tungsten rod penetrates through the glass material layer and extends to the upper end of the anode end valve metal body. A laser outer shell glass tube is connected between the cathode end valve metal body and the anode end valve metal body. One end of the laser outer shell glass tube is connected to the glass material layer. A capillary tube is provided inside the laser outer shell glass tube. The lower end of the capillary tube is connected with a conical port. The lower end of the conical port is connected to the junction of the glass material layer and the laser outer shell glass tube. One end of the cathode end valve metal body is fixed with a cathode aluminum cylinder. The cathode aluminum cylinder is sleeved on the upper end of the capillary tube.

[0009] Preferably, the tungsten rod is welded to one side of the anode end valve metal body.

[0010] Preferably, the length of the tungsten rod is 1 - 10 mm.

[0011] Preferably, the glass material layer is made of one of glass powder or glass sheet.

[0012] Preferably, the thermal expansion coefficient of the glass material layer is the same as that of the cathode end valve metal body and the anode end valve metal body.

[0013] Preferably, the glass material layer, the laser outer shell glass tube, the conical port, the tungsten rod and the anode end valve metal body are welded to each other.

[0014] Preferably, a reflecting mirror is provided at one end of both the cathode end valve metal body and the anode end valve metal body.

[0015] In the present utility model, during manufacturing, a tungsten rod with a diameter of about 2 mm is welded to the inner end face of the anode end valve metal body. Glass powder (or a glass sheet) is coated on the inner end face of the anode end valve metal body. The thermal expansion coefficient of the glass powder (or the glass sheet) should be the same as that of the valve metal. The anode end valve metal body coated with glass powder (or with a glass sheet placed) is put into a high-frequency furnace together with the capillary tube and the laser outer shell glass tube. The high-frequency furnace heats up the anode valve metal to melt and weld the capillary tube, the laser outer shell glass tube and the anode end valve metal body. During this process, the coated glass powder (or the placed glass sheet) will also melt. The melted glass material infiltrates with the valve metal end face to form a firm and uniform glass material covering layer, and is welded into one body with the glass at the conical port end of the capillary tube to form a high-voltage insulation layer to prevent the valve metal from discharging.

[0016] The purpose of the present utility model is to eliminate the ionization and gasification of the anode end valve metal of the assembled helium-neon laser with metal at both ends and a glass tube in the middle during the operation of the laser, thereby preventing the gasified substances of the anode end valve metal from polluting the inside of the laser and prolonging the service life of the laser.

[0017] The utility model covers the inner surface of the anode-end metal with glass material to block the cathode discharge of the anode-end valve metal, and installs a tungsten rod as the anode of the laser. Since the anode-end valve metal of the laser no longer serves as the electrode of the laser and does not participate in the high-voltage discharge of the laser, it will not be ionized and vaporized. Therefore, it can effectively prevent the anode-end valve metal from being ionized and vaporized to produce pollution and extend the service life of the laser. Description of the Drawings

[0018] Figure 1 is the structural diagram of the utility model;

[0019] Figure 2 is the structural diagram of the connection between the laser housing glass tube and the capillary tube of the utility model;

[0020] Figure 3 is the structural diagram of the laser housing glass tube of the utility model;

[0021] Figure 4 is the structural diagram of the capillary tube of the utility model;

[0022] Figure 5 is the structural diagram of the setting of the anode-end valve metal body and the glass material layer of the utility model;

[0023] Figure 6 is the structural diagram of the connection between the anode-end valve metal body and the tungsten rod of the utility model.

[0024] In the figure: 1 cathode-end valve metal body, 2 cathode aluminum cylinder, 3 laser housing glass tube, 4 glass material layer, 5 anode-end valve metal body, 6 mirror, 7 tungsten rod, 8 capillary tube, 9 tapered opening. Detailed Embodiment

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0026] Referring to Figure 1-6 , a helium-neon laser anti-pollution structure includes a cathode-end valve metal body 1 and an anode-end valve metal body 5. A glass material layer 4 is provided at the upper end of the anode-end valve metal body 5. The glass material layer 4 is made of one of glass powder or glass flakes, and the thermal expansion coefficient of the glass material layer 4 is the same as that of the cathode-end valve metal body 1 and the anode-end valve metal body 5.

[0027] One side of the upper end of the anode end valve metal body 5 is connected with a tungsten rod 7. The tungsten rod 7 penetrates through the glass material layer 4 and extends to the upper end of the anode end valve metal body 5. The tungsten rod 7 is a tungsten rod 7 with a diameter of about 2 mm, and the tungsten rod 7 is welded to one side of the anode end valve metal body 5.

[0028] A laser housing glass tube 3 is connected between the cathode end valve metal body 1 and the anode end valve metal body 5. One end of the laser housing glass tube 3 is connected to the glass material layer 4. A capillary tube 8 is arranged inside the laser housing glass tube 3. The lower end of the capillary tube 8 is connected with a tapered opening 9. The lower end of the tapered opening 9 is connected to the junction of the glass material layer 4 and the laser housing glass tube 3. The glass material layer 4, the laser housing glass tube 3, the tapered opening 9 of the capillary tube 8, the tungsten rod 7 and the anode end valve metal body 5 are fused together as a whole.

[0029] One end of the cathode end valve metal body 1 is fixed with a cathode aluminum cylinder 2. The cathode aluminum cylinder 2 is sleeved on the upper end of the capillary tube 8. Reflective mirrors 6 are arranged at one ends of both the cathode end valve metal body 1 and the anode end valve metal body 5.

[0030] In the present utility model, during production, a tungsten rod 7 with a diameter of about 2 mm is welded to the inner end face of the anode end valve metal body 5. Glass powder (or a glass sheet) is coated on the inner end face of the anode end valve metal body 5. The thermal expansion coefficient of the glass powder (or the glass sheet) should be the same as that of the valve metal. The anode end valve metal body 5 coated with glass powder (or with a glass sheet placed) is put into a high-frequency furnace together with the capillary tube 8 and the laser housing glass tube 3. The high-frequency furnace heats and raises the temperature of the anode valve metal to fuse the capillary tube 8, the laser housing glass tube 3 and the anode end valve metal body 5. During this process, the coated glass powder (or the placed glass sheet) will also melt. The melted glass material infiltrates with the valve metal end face to form a firm and uniform glass material covering layer, and is fused with the glass at the tapered opening 9 end of the capillary tube 3 as a whole to form a high-voltage insulation layer to prevent the valve metal from discharging.

[0031] The above is only a preferred specific embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present utility model, according to the technical solution of the present utility model and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present utility model.

Claims

1. A HeNe laser anti-pollution structure, comprising a cathode-end valveable metal body (1) and an anode-end valveable metal body (5), characterized in that: A glass material layer (4) is provided at the upper end of the anode valveable metal body (5); a tungsten rod (7) is connected to one side of the upper end of the anode valveable metal body (5); the tungsten rod (7) penetrates the glass material layer (4) and extends to the upper end of the anode valveable metal body (5); a laser housing glass tube (3) is connected between the cathode valveable metal body (1) and the anode valveable metal body (5); one end of the laser housing glass tube (3) is connected to the glass material layer (4); a capillary (8) is provided in the laser housing glass tube (3); a conical mouth (9) is connected to the lower end of the capillary (8); the lower end of the conical mouth (9) is connected to the junction of the glass material layer (4) and the laser housing glass tube (3); a cathode aluminum tube (2) is fixed to one end of the cathode valveable metal body (1); the cathode aluminum tube (2) is sleeved on the upper end of the capillary (8).

2. The anti-pollution structure for a HeNe laser according to claim 1, characterized in that: The tungsten rod (7) is welded to one side of the anode-end valveable metal body (5).

3. The anti-pollution structure for HeNe laser according to claim 1, characterized in that: The length of the tungsten rod (7) is 1-10 mm.

4. The anti-pollution structure for HeNe laser according to claim 1, characterized in that: The glass material layer (4) is made of glass powder or glass sheet.

5. The anti-pollution structure for HeNe laser according to claim 1, characterized in that: The thermal expansion coefficient of the glass material layer (4) is the same as that of the cathode-end valveable metal body (1) and the anode-end valveable metal body (5).

6. The anti-pollution structure for HeNe laser according to claim 1, characterized in that: The glass material layer (4), the laser housing glass tube (3), the tapered port (9), the tungsten rod (7) and the anode terminal valve metal body (5) are welded to each other.

7. The anti-pollution structure for HeNe laser according to claim 1, characterized in that: A reflector (6) is provided at one end of the cathode valveable metal body (1) and the anode valveable metal body (5).

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