Temperature monitoring system, laser frequency conversion cavity and laser

Abstract

The invention relates to the technical field of lasers, and discloses a temperature monitoring system, a laser frequency conversion cavity and a laser, and the system comprises a water cooling pipeline which is arranged at the periphery of the frequency conversion cavity; the first temperature sensor is arranged on the water inlet part of the water cooling pipeline and used for collecting the water inlet temperature of the water cooling pipeline; the second temperature sensor is arranged on the water outlet part of the water cooling pipeline and is used for collecting the water outlet temperature of the water cooling pipeline; the water flow sensor is arranged on the water inlet part or the water outlet part and used for collecting the water flow of the water cooling pipeline; the control unit is used for calculating the heat production amount of the frequency conversion cavity according to the water inlet temperature, the water outlet temperature and the water flow and evaluating the temperature of the frequency conversion cavity according to the heat production amount, a temperature sensor does not need to be arranged in the frequency conversion cavity, a hole is not needed to lead out a signal line, and the sealing performance of the frequency conversion cavity is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of lasers, and in particular to a temperature monitoring system, a laser frequency conversion cavity and a laser. Background Art

[0002] Since the absorption rate of green light by high-reflective materials is about 7-8 times higher than that of infrared light, green lasers have shown incomparable advantages over current traditional infrared lasers in many industrial processing solutions, especially in applications such as high-reflective material cutting and welding / glass cutting. Ultraviolet lasers are also favored by industrial processing in terms of fine processing due to the small thermal impact of cold processing and smaller focused spot. Based on the above advantages of short-wavelength green lasers and ultraviolet lasers, green laser technology and ultraviolet laser technology have achieved a leap forward, and market demand continues to increase.

[0003] At present, green lasers and ultraviolet lasers usually use infrared light as the fundamental frequency light, and use frequency doubling devices to multiply the fundamental frequency light to convert infrared light into green light. In addition to the frequency doubling process, ultraviolet lasers also need to use sum frequency devices to convert green light and infrared light in a sum frequency manner before they can be generated. Usually, the frequency doubling device is set in the frequency doubling cavity, and the conversion of infrared light into green light is completed in the frequency doubling cavity. Similarly, the sum frequency device is set in the sum frequency cavity, and the conversion of green light and infrared light into ultraviolet light is completed in the sum frequency cavity. The sum frequency cavity and the frequency doubling cavity are collectively called the frequency conversion cavity. In the process of frequency doubling and sum frequency operation, the occurrence of frequency doubling and sum frequency has extremely high requirements on temperature. When the temperature is too low or too high, the light-to-light conversion efficiency of frequency doubling and sum frequency will deteriorate. At the same time, excessively high temperature will also generate a lot of heat. It is necessary to monitor the temperature changes in the frequency doubling cavity in real time, and export the heat out of the frequency doubling cavity and sum frequency cavity in time to prevent damage to the various optical devices in the frequency doubling cavity and sum frequency cavity.

[0004] In order to prevent high temperature from damaging the optical devices in the cavity, the current solution is to equip the frequency doubling cavity and sum frequency cavity with temperature sensors to monitor and evaluate the cavity temperature. However, the frequency doubling cavity and sum frequency cavity of the laser need to be strictly sealed. If a temperature sensor is added inside, it is necessary to open a hole in the frequency doubling cavity to lead out the signal line, which will damage the seal. Summary of the invention

[0005] In view of this, the present invention provides a temperature monitoring system, a laser frequency conversion cavity and a laser to solve or partially solve the technical problem that the existing temperature monitoring system monitors the temperature in the frequency conversion cavity, which leads to a decrease in sealing.

[0006] The technical solution proposed by the present invention is as follows:

[0007] In a first aspect, the present invention provides a temperature monitoring system, which is applied to a frequency conversion cavity of a laser, comprising: a water-cooling pipe, which is arranged on the periphery of the frequency conversion cavity; a first temperature sensor, which is arranged on the water inlet of the water-cooling pipe, and is used to collect the water inlet temperature of the water-cooling pipe; a second temperature sensor, which is arranged on the water outlet of the water-cooling pipe, and is used to collect the water outlet temperature of the water-cooling pipe, wherein the water inlet and the water outlet are both located outside the frequency conversion cavity; a water flow sensor, which is arranged on the water inlet or the water outlet, and is used to collect the water flow rate of the water-cooling pipe; a control unit, which is respectively connected to the first temperature sensor, the second temperature sensor and the water flow sensor, and is used to calculate the heat generation of the frequency conversion cavity according to the water inlet temperature, the water outlet temperature and the water flow rate, and to evaluate the temperature of the frequency conversion cavity according to the heat generation.

[0008] A temperature monitoring system in an embodiment of the present invention can calculate the heat generation of the frequency conversion cavity by collecting the water inlet temperature and water outlet temperature of the water cooling pipe through a first temperature sensor and a second temperature sensor outside the frequency conversion cavity, combined with the water flow rate collected by the water flow sensor, and then evaluate the temperature of the frequency conversion cavity. There is no need to set a temperature sensor inside the frequency conversion cavity and open a hole to lead out a signal line, thereby ensuring the sealing of the frequency conversion cavity.

[0009] Optionally, the formula for calculating the heat generation of the frequency conversion cavity is: heat generation = specific heat capacity of water ×

[0010] Water density × water flow × (outlet water temperature - inlet water temperature) × statistical time.

[0011] The heat production can be accurately calculated using this formula.

[0012] Optionally, the temperature monitoring system further includes: a sealing layer, which is arranged on the periphery of the water-cooling pipe and is used to seal the water-cooling pipe and the frequency conversion cavity.

[0013] The entire frequency conversion cavity is sealed by the sealing layer to ensure the stability of the entire frequency conversion work of the laser, and also to ensure the accuracy of the temperature monitoring results.

[0014] Optionally, the temperature monitoring system further includes: a temperature controller, which is arranged on the water inlet; correspondingly, the control unit is also connected to the temperature controller, and is used to adjust the water temperature of the water entering the water cooling pipe according to the temperature of the frequency conversion cavity.

[0015] By adjusting the water temperature of the water entering the water cooling pipe according to the temperature of the frequency conversion cavity, the temperature in the frequency conversion cavity can be maintained stable.

[0016] Optionally, the temperature monitoring system also includes: a water flow regulator, which is arranged on the water inlet; correspondingly, the control unit is also connected to the water flow regulator to adjust the water flow of the water body entering the water cooling pipe according to the temperature of the frequency conversion cavity.

[0017] By adjusting the water flow rate of the water body entering the water cooling pipe according to the temperature of the frequency conversion cavity, the temperature in the frequency conversion cavity can be maintained stable.

[0018] Optionally, the water cooling pipe is an S-shaped pipe.

[0019] The use of S-shaped pipes can increase the water cooling area, improve capacity and efficiency.

[0020] Optionally, the water-cooling pipe is arranged in a plurality of circles, and the plurality of circles of the water-cooling pipe form one or more water-cooling layers surrounding the frequency conversion cavity.

[0021] A water-cooling layer or layers surrounding the frequency conversion cavity are formed by several circles of the water-cooling pipe, so that the water-cooling pipe stays in the frequency conversion cavity for a sufficient time and the water flows through a sufficient area to improve the heat dissipation capacity and efficiency of the water-cooling pipe and ensure that the temperature of each area in the frequency conversion cavity is as consistent as possible.

[0022] Optionally, the water inlet portion is a water inlet pipe, and the water outlet portion is a water outlet pipe.

[0023] The normal flow of cooling water is ensured by arranging a water inlet pipe and a water outlet pipe on the water cooling pipe.

[0024] In a second aspect, the present invention provides a laser frequency conversion cavity, comprising the temperature monitoring system as described in the first aspect of the present invention.

[0025] In a third aspect, the present invention provides a laser, comprising the laser frequency conversion cavity as described in the second aspect of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly express the technical solutions of the embodiments of the present invention, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 This is a schematic diagram of the structure of a temperature monitoring system in an embodiment of the present invention;

[0028] Figure 2 It is a structural schematic diagram of another temperature monitoring system in an embodiment of the present invention;

[0029] Figure 3 Schematic diagram of the structure of another temperature monitoring system in an embodiment of the present invention.

[0030] Reference numerals:

[0031] 10-frequency conversion cavity; 11-frequency conversion crystal; 12-optical lens; 13-water cooling pipe; 14-sealing layer; 21-water inlet; 22-water outlet; 31-first temperature sensor; 32-second temperature sensor; 33-water flow sensor; 40-control unit; 51-temperature regulator; 52-water flow regulator. DETAILED DESCRIPTION

[0032] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] In related schemes, in order to prevent high temperature from damaging the optical devices in the cavity, temperature sensors are installed inside the frequency doubling and sum frequency cavities to monitor and evaluate the temperature inside the cavity. Since the temperature sensor that monitors the temperature inside the laser is set inside the cavity, it has the following disadvantages:

[0037] 1. The frequency doubling cavity and sum frequency cavity of the laser need to be strictly sealed. If a temperature sensor is added inside, it is necessary to open a hole in the frequency doubling cavity to lead out the signal line, which will destroy the seal.

[0038] 2. There are a large number of lenses and crystals in the frequency doubling cavity and the sum frequency cavity, and a large amount of laser diffuse reflection, which will cause accelerated damage and false alarms to the temperature sensor, and the monitoring results are sometimes inaccurate.

[0039] 3. There are a large number of lenses and crystals in the frequency doubling cavity and the sum frequency cavity. The location for installing the temperature sensor is limited. The temperature sensor can only monitor the temperature of a single point. Many other areas that need to be monitored cannot be installed. Sometimes, due to the temperature difference at each location, the overall heat generation of the entire frequency doubling cavity cannot be evaluated, resulting in the monitoring results not matching the expected needs.

[0040] Based on this, an embodiment of the present invention provides a temperature monitoring system, which is applied to a frequency conversion cavity 10 of a laser, such as a frequency doubling cavity and a sum frequency cavity.

[0041] like Figure 1 As shown, an embodiment of the present invention provides a temperature monitoring system, including: a water-cooling pipe 13, which is arranged on the periphery of a frequency conversion cavity 10; a first temperature sensor 31, which is arranged on a water inlet 21 of the water-cooling pipe 13, and is used to collect the water inlet temperature of the water-cooling pipe 13; a second temperature sensor 32, which is arranged on a water outlet 22 of the water-cooling pipe 13, and is used to collect the water outlet temperature of the water-cooling pipe 13, wherein the water inlet 21 and the water outlet 22 are both located outside the frequency conversion cavity 10; a water flow sensor 33, which is arranged on the water inlet 21 or the water outlet 22, and is used to collect the water flow rate of the water-cooling pipe 13; a control unit 40, which is respectively connected to the first temperature sensor 31, the second temperature sensor 32 and the water flow sensor 33, and is used to calculate the heat generation of the frequency conversion cavity 10 according to the water inlet temperature, the water outlet temperature and the water flow rate, and to evaluate the temperature of the frequency conversion cavity 10 according to the heat generation.

[0042] Specifically, the frequency conversion cavity 10 can be a frequency doubling cavity or a sum frequency cavity, which is provided with a frequency conversion crystal 11 and a plurality of optical lenses 12 (only one is shown in the figure, but there are actually multiple lenses). A water cooling pipe 13 is provided on the periphery of the frequency conversion crystal 11 and the optical lens 12. One end of the water cooling pipe 13 is connected to a water inlet 21, and the other end is connected to a water outlet 22. Both the water inlet 21 and the water outlet 22 are located outside the frequency conversion cavity 10, and the water inlet 21 and the water outlet 22 are respectively connected to the water inlet and the water outlet of the water cooling pipe 13, thereby forming a water cooling circulation system.

[0043] A first temperature sensor 31 is provided on the water inlet 21 near the water inlet of the water cooling pipe 13, and a second temperature sensor 32 is provided on the water outlet 22 near the water outlet of the water cooling pipe 13. In addition, a water flow sensor is also provided on the water inlet 21 or the water outlet 22.

[0044] The inlet water temperature and the outlet water temperature of the water cooling pipe 13 are collected by the first temperature sensor 31 and the second temperature sensor 32 , and the water flow rate of the water cooling pipe 13 is collected by the water flow rate sensor.

[0045] The control unit 40 can be a smart terminal such as a computer or a mobile phone. It receives the water inlet temperature, water outlet temperature and water flow rate collected by the sensor, calculates the heat generation of the frequency conversion cavity 10 based on the water inlet temperature, water outlet temperature and water flow rate, and then evaluates the temperature of the frequency conversion cavity 10 based on the heat generation.

[0046] Generally speaking, if the heat generation continues to rise, it means that there is an abnormal lens or crystal in the frequency conversion cavity 10, which causes the lens or crystal to heat abnormally and generate more heat. The greater the heat generation, the greater the temperature in the corresponding frequency conversion cavity 10. Therefore, by pre-calibrating the heat generation corresponding to each temperature, the temperature of the frequency conversion cavity 10 can be evaluated based on the heat generation, and whether the temperature in the frequency conversion cavity 10 is abnormal can be discovered at an early stage.

[0047] A temperature monitoring system according to an embodiment of the present invention can calculate the heat generation of the frequency conversion cavity 10 by collecting the water inlet temperature and the water outlet temperature of the water cooling pipe 13 through a first temperature sensor 31 and a second temperature sensor 32 outside the frequency conversion cavity 10, combined with the water flow collected by the water flow sensor 33, and then evaluate the temperature of the frequency conversion cavity 10. There is no need to set a temperature sensor inside the frequency conversion cavity 10 and to open a hole to lead out a signal line, thereby ensuring the sealing of the frequency conversion cavity 10.

[0048] In addition, in a temperature monitoring system according to an embodiment of the present invention, the first temperature sensor 31, the second temperature sensor 32 and the water flow sensor 33 are all arranged outside the frequency conversion cavity 10, which can prevent the laser inside the frequency conversion cavity 10 from damaging them and causing false alarms.

[0049] In the embodiment of the present invention, the heat generation calculated based on the water inlet temperature, the water outlet temperature and the water flow rate is the overall heat generation of the frequency conversion cavity 10. This can avoid the situation where the temperature sensor can only monitor the temperature of a single point and many other areas that need to be monitored cannot be installed. Sometimes, due to the temperature difference at each location, the overall heat generation of the entire frequency conversion cavity 10 cannot be evaluated, resulting in a mismatch between the monitoring results and the expected needs, thereby improving the accuracy of temperature monitoring.

[0050] In some embodiments, the formula for calculating the heat generation of the frequency conversion cavity 10 is:

[0051] Heat generation = specific heat capacity of water × water density × water flow × (outlet water temperature - inlet water temperature) ×

[0052] Statistics duration.

[0053] In one example, the specific heat capacity of water is 4.0187 kj / (kg·℃), and the density of water is 1000 kg / m 3 , correspondingly, the water flow unit is 10m 3 / s, the unit of outlet water temperature and inlet water temperature is ℃, the unit of statistical time is s, and the statistical time length represents the time difference between detecting inlet water temperature and outlet water temperature, which can be set by yourself.

[0054] The control unit 40 can accurately calculate the heat generation through the above formula.

[0055] In some embodiments, the temperature monitoring system further includes: a sealing layer 14 , which is disposed on the periphery of the water cooling pipe 13 and is used to seal the water cooling pipe 13 and the frequency conversion cavity 10 .

[0056] The sealing layer 14 can be made of metal or glass material. It is a rectangular cavity that covers the water-cooling pipe 13 and the frequency conversion cavity 10. The entire frequency conversion cavity 10 is sealed by the sealing layer 14 to ensure the stability of the entire frequency conversion work of the laser, and also to ensure the accuracy of the temperature monitoring results.

[0057] In some embodiments, Figure 2 As shown, the temperature monitoring system also includes: a temperature controller 51, which is arranged on the water inlet 21; correspondingly, the control unit 40 is also connected to the temperature controller 51, and is used to adjust the water temperature of the water entering the water cooling pipe 13 according to the temperature of the frequency conversion cavity 10.

[0058] Specifically, when the temperature in the frequency conversion cavity 10 is higher than the normal value, the temperature controller 51 can adjust the water temperature of the water entering the water cooling pipe 13, and improve the cooling capacity of the water cooling circulation system by lowering the inlet water temperature of the water cooling pipe 13. When the temperature in the frequency conversion cavity 10 is lower than the normal value, the inlet water temperature of the water cooling pipe 13 can be appropriately increased to prevent the frequency conversion cavity 10 from being in an inappropriate low temperature state, thereby maintaining the temperature stability in the frequency conversion cavity 10, so that the frequency conversion cavity 10 is always in a suitable temperature environment.

[0059] In some embodiments, Figure 3 As shown, the temperature monitoring system also includes: a water flow regulator 52, which is arranged on the water inlet 21; correspondingly, the control unit 40 is also connected to the water flow regulator 52, which is used to adjust the water flow of the water body entering the water cooling pipe 13 according to the temperature of the frequency conversion cavity 10.

[0060] Specifically, when the temperature in the frequency conversion cavity 10 is higher than the normal value, the water flow regulator 52 can adjust the water flow rate, by increasing the water inlet flow rate of the water cooling pipe 13, thereby improving the cooling capacity of the water cooling circulation system. When the temperature in the frequency conversion cavity 10 is lower than the normal value, the water inlet flow rate of the water cooling pipe 13 can be appropriately lowered to prevent the frequency conversion cavity 10 from being in an inappropriate low temperature state, so that the inside of the frequency conversion cavity 10 is always in a suitable temperature environment.

[0061] It should be understood that the water flow controller 52 and the temperature controller 51 may be provided simultaneously to jointly adjust the temperature in the frequency conversion cavity 10 , or the water flow controller 52 or the temperature controller 51 may be provided separately.

[0062] In some embodiments, the water cooling pipe 13 is an S-shaped pipe.

[0063] That is, the water cooling pipe 13 is arranged in an S shape on the surface of the frequency conversion cavity 10. The use of the S-shaped pipe can increase the water cooling area and improve the capacity and efficiency.

[0064] Furthermore, the water cooling pipe 13 is surrounded by a plurality of circles, and the plurality of circles of the water cooling pipe 13 form one or more water cooling layers surrounding the frequency conversion cavity 10 .

[0065] A water-cooling layer or layers surrounding the frequency conversion cavity 10 are formed by a plurality of circles of water-cooling pipes 13, so that the water-cooling pipes 13 stay in the frequency conversion cavity 10 for a sufficient time and the water flows through a sufficient area, so as to improve the heat dissipation capacity and efficiency of the water-cooling pipes 13 and ensure that the temperature of each area in the frequency conversion cavity 10 is as consistent as possible.

[0066] Furthermore, the water inlet 21 is a water inlet pipe, and the water outlet 22 is a water outlet pipe. By arranging the water inlet pipe and the water outlet pipe on the water cooling pipe 13, the normal flow of the cooling water is ensured, and the installation of the sensor is convenient.

[0067] The embodiment of the present invention further provides a laser frequency conversion cavity 10, comprising the temperature monitoring system in the above embodiment.

[0068] An embodiment of the present invention further provides a laser, comprising the laser frequency conversion cavity 10 as in the above embodiment.

[0069] A temperature monitoring system according to an embodiment of the present invention has the following effects:

[0070] A temperature monitoring system according to an embodiment of the present invention can calculate the heat generation of the frequency conversion cavity 10 by collecting the water inlet temperature and the water outlet temperature of the water cooling pipe 13 through a first temperature sensor 31 and a second temperature sensor 32 outside the frequency conversion cavity 10, combined with the water flow collected by the water flow sensor 33, and then evaluate the temperature of the frequency conversion cavity 10. There is no need to set a temperature sensor inside the frequency conversion cavity 10 and to open a hole to lead out a signal line, thereby ensuring the sealing of the frequency conversion cavity 10.

[0071] In addition, in a temperature monitoring system according to an embodiment of the present invention, the first temperature sensor 31, the second temperature sensor 32 and the water flow sensor 33 are all arranged outside the frequency conversion cavity 10, which can prevent the laser inside the frequency conversion cavity 10 from damaging them and causing false alarms.

[0072] In the embodiment of the present invention, the heat generation calculated based on the water inlet temperature, the water outlet temperature and the water flow rate is the overall heat generation of the frequency conversion cavity 10. This can avoid the situation where the temperature sensor can only monitor the temperature of a single point and many other areas that need to be monitored cannot be installed. Sometimes, due to the temperature difference at each location, the overall heat generation of the entire frequency conversion cavity 10 cannot be evaluated, resulting in a mismatch between the monitoring results and the expected needs, thereby improving the accuracy of temperature monitoring.

[0073] By providing a temperature controller 51 and a water flow controller 52 and adjusting the water inlet temperature and the water flow according to the temperature, the temperature in the frequency conversion cavity 10 can be kept stable, so that the frequency conversion cavity 10 is always in a suitable temperature environment.

[0074] By providing one or more layers of S-shaped pipes, the water-cooling pipe 13 stays in the frequency conversion cavity 10 for a sufficient time and the water flows through a sufficient area, so as to improve the heat dissipation capacity and efficiency of the water-cooling pipe 13 and ensure that the temperature of each area in the frequency conversion cavity 10 is as consistent as possible.

[0075] Although example embodiments and their advantages have been described in detail, those skilled in the art may make various changes, substitutions and modifications to these embodiments without departing from the spirit and defined scope of the present invention, and such modifications and variations are all within the defined scope.

Claims

1. A temperature monitoring system, applied to a frequency conversion cavity (10) of a laser, characterized in that: include: A water cooling pipe (13) is arranged on the periphery of the frequency conversion cavity (10); A first temperature sensor (31), arranged on a water inlet portion (21) of the water cooling pipe (13), and used for collecting the water inlet temperature of the water cooling pipe (13); a second temperature sensor (32), arranged on a water outlet (22) of the water cooling pipe (13), and used for collecting the outlet water temperature of the water cooling pipe (13), wherein the water inlet (21) and the water outlet (22) are both located outside the frequency conversion cavity (10); A water flow sensor (33), arranged on the water inlet (21) or the water outlet (22), and used for collecting the water flow of the water cooling pipe (13); A control unit (40) is connected to the first temperature sensor (31), the second temperature sensor (32) and the water flow sensor (33) respectively, and is used to calculate the heat generation of the frequency conversion chamber (10) according to the water inlet temperature, the water outlet temperature and the water flow rate, and to evaluate the temperature of the frequency conversion chamber (10) according to the heat generation.

2. The temperature monitoring system according to claim 1, characterized in that: The formula for calculating the heat generation of the frequency conversion cavity (10) is: Heat generation = specific heat capacity of water × water density × water flow × (outlet water temperature - inlet water temperature) × statistical time.

3. The temperature monitoring system according to claim 1, characterized in that: Also includes: A sealing layer is arranged on the periphery of the water cooling pipe (13) and is used to seal the water cooling pipe (13) and the frequency conversion cavity (10).

4. The temperature monitoring system according to claim 1, characterized in that: Also includes: A temperature controller (51) is arranged on the water inlet portion (21); Correspondingly, the control unit (40) is also connected to the temperature controller (51) and is used to adjust the temperature of the water entering the water cooling pipe (13) according to the temperature of the frequency conversion cavity (10).

5. The temperature monitoring system according to claim 1 or 4, characterized in that: Also includes: A water flow regulator (52) is arranged on the water inlet portion (21); Correspondingly, the control unit (40) is also connected to the water flow regulator (52) and is used to adjust the water flow of the water body entering the water cooling pipe (13) according to the temperature of the frequency conversion cavity (10).

6. The temperature monitoring system according to claim 1, characterized in that: The water cooling pipe (13) is an S-shaped pipe.

7. The temperature monitoring system according to claim 1, characterized in that: The water cooling pipe (13) is surrounded by a plurality of circles, and the plurality of circles of the water cooling pipe (13) form one or more layers of water cooling layers surrounding the frequency conversion cavity (10).

8. The temperature monitoring system according to claim 1, characterized in that: The water inlet portion (21) is a water inlet pipe, and the water outlet portion (22) is a water outlet pipe.

9. A laser frequency conversion cavity, characterized in that: Comprising a temperature monitoring system as claimed in any one of claims 1 to 8.

10. A laser, characterized in that: It comprises a laser frequency conversion cavity (10) as claimed in claim 9.

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