Ultra-long discharge tube negative high voltage laser

Abstract

An ultra-long discharge tube negative high-voltage laser, comprising a gas storage tube, wherein the two ends of the gas storage tube are respectively provided with a reflector and a light-emitting surface; a water-cooling tube, which is located inside the gas storage tube; a discharge tube, which is located inside the water-cooling tube, wherein electrodes are respectively provided at both ends of the discharge tube, wherein the electrodes are connected to the outside of the gas storage tube through a lead wire, a space for liquid circulation is formed between the discharge tube and the water-cooling tube, and the water-cooling tube is connected to the outside of the gas storage tube through a water inlet pipe and a water outlet pipe, and is characterized in that: the cathode in the electrode is installed in a cathode chamber located at one end of the discharge tube near the reflector, and a spiral gas return pipe is connected to the cathode chamber; and the anode is sleeved on the outside of the water-cooling tube at the other end of the discharge tube. The laser of the present invention can increase its power under limited length.

Description

Technical Field

[0001] The invention relates to a structural improvement of a carbon dioxide laser, and more particularly to a negative high-voltage small-sized ultra-long discharge tube negative high-voltage laser with higher power through structural improvement. Background Art

[0002] Existing small sealed-type CO2 lasers are usually composed of a gas storage tube, a discharge tube, a water cooling tube, electrodes, and a resonant cavity mirror. The two ends of the discharge tube are respectively provided with cavities with electrodes, namely the anode chamber and the cathode chamber. A common sealed-type CO2 laser will have a spiral gas return pipe connected to the anode chamber.

[0003] Similar structures are disclosed in Chinese utility model patent 89215596.5, Chinese utility model patent 201420436154.0 and Chinese utility model patent 201922497384.3. In order to increase the output power of sealed CO2 laser tubes with this structure, the length of the discharge tube is usually increased, which increases the total length of the laser and also increases the production, transportation, installation and use costs of the laser.

[0004] In order to solve this problem, Chinese invention patent application CN111934172A discloses a slat-type carbon dioxide glass tube laser, including a core discharge cavity, which is covered by an inner glass tube and an outer glass tube in turn, and the two ends of the inner glass tube are respectively provided with a positive discharge electrode and a negative discharge electrode, and the two ends of the inner glass tube are respectively provided with a return gas disk and a fixed disk near the positive discharge electrode and the negative discharge electrode; without increasing the length, the discharge volume is increased, the working gas pressure is high, and the saturated light intensity is higher. The carbon dioxide laser of this structure is quite different from the traditional structure, and it is necessary to make major adjustments to the production and processing process. Summary of the invention

[0005] The purpose of the present invention is to address the deficiencies of the prior art and provide an ultra-long discharge tube negative high-voltage laser that is similar in structure to a traditional sealed carbon dioxide laser and can increase the output power without increasing the overall length of the laser.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0007] An ultra-long discharge tube negative high-voltage laser, comprising:

[0008] An air storage pipe, wherein two ends of the air storage pipe are respectively provided with a reflector and a light emitting surface;

[0009] A water cooling pipe, which is located inside the gas storage pipe;

[0010] A discharge tube is located inside the water cooling tube, electrodes are provided at both ends of the discharge tube, the electrodes are connected to the outside of the gas storage tube through leads, a space for liquid circulation is formed between the discharge tube and the water cooling tube, and the water cooling tube is connected to the outside of the gas storage tube through a water inlet pipe and a water outlet pipe, characterized in that:

[0011] The cathode in the electrode is installed in a cathode chamber located at one end of the discharge tube close to the reflector, and a spiral air return pipe is connected to the cathode chamber; the anode is sleeved on the outside of the water cooling pipe at the other end of the discharge tube.

[0012] The super-long discharge tube in this patent means that compared with the discharge tube in the existing carbon dioxide laser, the length of the discharge tube can be made longer without increasing the overall length of the gas storage tube, thereby making full use of the length of the gas storage tube.

[0013] Since the anode jacket is outside the water cooling tube and no longer occupies the length of the tube, the above technical solution can make the discharge tube longer without increasing the size of the laser, that is, improve the power of the laser. Specifically, it will be explained in combination with the difference between it and the existing carbon dioxide laser.

[0014] In the existing CO2 laser, the gas return pipe is connected to one side of the anode, so a corresponding anode chamber is required to connect the gas return pipe to the side wall of the anode chamber. The cathode must be installed in the cathode chamber inside the tube due to its characteristics, and must maintain a certain length along the axial direction of the discharge tube and a certain distance from the end of the gas storage tube.

[0015] Compared with the existing carbon dioxide laser, the technology of the present invention moves the return air pipe to the side of the cathode electrode, utilizes the length of the cathode chamber, and surrounds the anode jacket on the outside of the water-cooling pipe at the other end, replacing the original anode chamber, which can fully extend the length of the discharge tube.

[0016] Some preferred technical solutions of the present invention are as follows:

[0017] Preferably, both ends of the gas storage tube are provided with tube sections with reduced diameters, and the end of the discharge tube at the anode end extends into the tube section with reduced diameters.

[0018] Preferably, the cathode is used to connect to the negative high voltage terminal of a power source.

[0019] Preferably, the end of the cathode chamber is connected to the inner wall of the gas storage pipe, and the pipe section where the anode is located is directly connected to the inside of the gas storage pipe.

[0020] Preferably, the distance between the discharge tube opening at the anode end and the light emitting surface is between 5 mm and 20 mm.

[0021] Compared with the prior art, the present invention has the following beneficial effects: the electrode chamber of the cathode is fully utilized, and the length of the anode chamber at the other end is eliminated, thereby allowing a longer discharge tube length, and improving the power of the laser without increasing the external dimensions of the laser. In some embodiments, since there is no anode chamber, the length of the original anode chamber is used as the length of the discharge tube, and since the anode chamber is eliminated, the diameter of this section of the tube is reduced and can be extended to the end of the gas storage tube, and the length of the discharge tube can also be further increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of embodiment 1 of the present invention;

[0023] Figure 2 is a partial enlarged view of the cathode chamber in an embodiment of the present invention;

[0024] Figure 3 is a partial enlarged cross-sectional view of the anode portion in an embodiment of the present invention;

[0025] The meanings of the symbols in the accompanying drawings are as follows: 101 - gas storage pipe, 102 - guide, 103 - reflector, 104 - cathode, 1041 - cathode chamber, 105 - water outlet pipe, 106 - return air pipe, 1061 - pipeline, 107 - discharge tube, 108 - water cooling tube, 109 - anode, 110 - wire, 111 - light emitting surface. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with test examples and specific implementation methods. However, this should not be understood as the scope of the above subject matter of the present invention being limited to the following embodiments, and all technologies realized based on the content of the present invention belong to the scope of the present invention.

[0027] Example 1

[0028] A negative high voltage ultra-long discharge tube carbon dioxide laser, such as Figure 1 As shown, the laser includes a gas storage tube 101, which is usually made of glass, and has a reflector 103 and a light emitting surface 111 at both ends. A water cooling tube 108 is arranged in the gas storage tube 101, and a discharge tube 107 is arranged in the water cooling tube 108. The gap between the outer wall of the discharge tube 107 and the inner wall of the water cooling tube 108 constitutes a flow space for cooling water. Figure 1 As shown in , the water cooling pipe 108 is connected to the outside of the gas storage pipe 101 through the water inlet pipe 112 and the water outlet pipe 105. In this embodiment, the water cooling pipe 108 and the discharge tube 107 are both made of glass, and the length and diameter of the water cooling pipe 108 are adapted to the discharge tube. The above structure is similar to the existing laser, and those skilled in the art can also make adjustments according to the specific parameter requirements of the laser.

[0029] In this embodiment, if Figure 2 As shown, a cathode chamber 1041 is provided at the end of the discharge tube 107 near one end of the reflector 111. The diameter of the cathode chamber 1041 is slightly larger than that of the discharge tube 107. The end of the cathode chamber 1041 is connected to the inner wall of the gas storage tube 101. A pipeline 1061 connected to the spiral gas return pipe 106 is provided on the side wall of the cathode chamber 1041. The pipeline 1061 is staggered with the water outlet pipe 105. The gas in the discharge tube 107 enters the gas storage pipe 101 through the cathode chamber 1041 and the gas return pipe 106. A cathode 104 is provided in the cathode chamber 1041. The cathode 104 is connected to the negative high voltage terminal of the power supply outside the gas storage pipe 101 through the wire 102. As shown in FIG. Figure 3 As shown, an anode 109 is provided at the end of the discharge tube 107 close to the light emitting surface 111. The anode 109 is sleeved on the outer side of the tube wall of the discharge tube 107 close to the light emitting surface 111. The anode 109 is connected to the high voltage end of the power supply outside the gas storage tube 101 through a wire 110.

[0030] After the above laser is powered on, the mixed gas in the discharge tube 107 is excited by the impact of electrons, and the energy level transition occurs to form a particle beam inversion to emit laser. Generally speaking, the length of the discharge tube 107 is proportional to the output power, that is, the distance between the two electrodes. Within a certain length range, the power output per meter of the discharge tube length increases with the total length. The purpose of adding the water cooling tube 108 is to cool the working gas and stabilize the output power. The discharge tube 107 is connected to the gas storage tube 101 at both ends, that is, one end of the gas storage tube 101 has a small hole connected to the discharge tube 107, and the other end is connected to the discharge tube through the spiral return gas pipe 106, so that the gas can circulate in the discharge tube 107 and the gas storage tube 101, and the gas in the discharge tube 107 can be exchanged at any time. Since the connection between the return gas pipe 106 and the cathode chamber 1041 requires a certain space (the access space of the return gas pipe), the connection requires an electrode chamber and a certain length. Furthermore, in the negative high voltage state, the cathode 104 will sputter during operation, that is, the cathode 104 needs to be placed in the cathode chamber 1041 and have a certain length for sputtering with the gas flowing out of the discharge tube during operation. If the gas return pipe is set on the anode side, both sides need electrode chambers (anode chamber and cathode chamber) of a certain length, so that the length left for the discharge tube (the length between the two electrodes) is limited, which limits the further increase of the laser power.

[0031] In this embodiment, since the gas return pipe 106 is placed on the cathode side with the cathode chamber, the corresponding anode chamber is no longer required on the anode 109 side, and the discharge tube 107 can be increased accordingly, thereby increasing the power of the laser.

[0032] like Figure 1As shown, a preferred solution of this embodiment, since the anode chamber is removed from the anode, the gas return pipe is no longer connected to the anode, resulting in a smaller radial dimension of the anode segment, that is, the segment can be extended into a gradual section where the diameter of the gas storage pipe gradually decreases. In this way, when the length of the gas storage pipe is constant, the length of the gas storage pipe is fully utilized, the length of the discharge tube is extended, and the power of the laser is increased. In some preferred embodiments, the distance between the discharge tube mouth at the anode end and the reflector can be between 5 mm and 20 mm (for example, 5 mm or 8 mm). Such a configuration can make full use of the length of the gas storage pipe and increase the power of the laser without increasing the external length of the entire laser.

Claims

1. An ultra-long discharge tube negative high-voltage laser, comprising: An air storage pipe, wherein two ends of the air storage pipe are respectively provided with a reflector and a light emitting surface; A water cooling pipe, which is located inside the gas storage pipe; A discharge tube is located inside the water cooling tube, electrodes are provided at both ends of the discharge tube, the electrodes are connected to the outside of the gas storage tube through leads, a space for liquid circulation is formed between the discharge tube and the water cooling tube, and the water cooling tube is connected to the outside of the gas storage tube through a water inlet pipe and a water outlet pipe, characterized in that: The cathode in the electrode is installed in the cathode chamber located at one end of the discharge tube near the reflector, and the cathode chamber is connected to a spiral air return pipe; the anode is sleeved on the outside of the water cooling pipe at the other end of the discharge tube. The two ends of the gas storage tube are provided with tube sections with reduced diameters, and the end of the discharge tube at the anode end extends into the tube section with reduced diameters. The end of the cathode chamber is connected to the inner wall of the gas storage pipe, and the pipe section where the anode is located is directly connected to the inside of the gas storage pipe. The distance between the discharge tube opening at the anode end and the light emitting surface is between 5 mm and 20 mm.

2. The ultra-long discharge tube negative high-voltage laser according to claim 1, characterized in that: The cathode is used to connect to the negative high voltage terminal of the power source.

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