LBO crystal frequency-doubling heating furnace of green laser therapy apparatus and control method of LBO crystal frequency-doubling heating furnace
By employing a multi-heating unit and sensing unit design in the LBO crystal frequency doubling furnace, combined with cavity adjustment components and PID feedback control, the problems of insufficient temperature uniformity and temperature control accuracy were solved, achieving efficient and stable green laser treatment effects.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-12
- Publication Date
- 2026-03-13
AI Technical Summary
Existing LBO crystal frequency doubling heating furnaces suffer from poor temperature uniformity, insufficient temperature control precision, and a simple structure, resulting in temperature gradients in different regions of the LBO crystal, which affects the frequency doubling conversion efficiency and the stability and safety of laser treatment.
A frequency doubling furnace for LBO crystals with multiple heating and sensing units was designed. By uniformly distributing heating and sensing units along the circumference of the crystal mounting cavity, and combining cavity adjustment components and fasteners, it can flexibly adapt to LBO crystals of different sizes. Through temperature acquisition by multiple sensing units and PID feedback control, precise temperature regulation and stability can be achieved.
It improves the frequency doubling conversion efficiency of the LBO crystal, ensures the stability and safety of laser output, reduces preheating time, and improves the efficiency and reliability of green laser treatment.
Smart Images
Figure CN121663295A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of medical laser equipment, and in particular to a green laser therapy machine LBO crystal frequency doubling furnace and its control method. Background Technology
[0002] In medical fields such as ophthalmology, dermatology, and urology, 523nm wavelength green laser plays an irreplaceable role due to its unique absorption characteristics. It is necessary to generate 523nm wavelength green laser by frequency doubling of the 1064nm fundamental frequency light using nonlinear optical crystals, such as LBO crystals.
[0003] The LBO crystal frequency doubling furnace, as a miniature temperature control capsule embedded in the device, occupies only a corner of the optical path system when integrated inside the green laser therapy machine. Since the frequency doubling efficiency of the LBO crystal is highly related to its operating temperature, only by precisely controlling the temperature, generally with a temperature control accuracy of less than ±0.1℃, to meet the non-critical phase matching conditions and be near the optimal frequency doubling temperature, can the highest conversion efficiency be achieved, thereby ensuring the stable and reliable operation of the green laser therapy machine.
[0004] However, ordinary LBO crystal frequency doubling furnaces typically use a single heating rod and a single temperature sensor design, which has several drawbacks: First, the temperature uniformity is poor. A single heating rod cannot form a uniform thermal field within the furnace, resulting in temperature gradients in different areas of the LBO crystal, which reduces the frequency doubling conversion efficiency. If the laser treatment efficiency is insufficient during surgery, not only will the expected quality effect not be achieved, but medical accidents may also occur. Second, the temperature control accuracy and reliability are insufficient. A single temperature sensor can only detect the temperature at a certain point in the furnace body, which deviates from the average temperature of the overall thermal field of the furnace body. Moreover, once the sensor fails or drifts, the temperature control of the entire system will become inaccurate, affecting the stability of the output power of the laser treatment machine and the safety of the equipment.
[0005] On the other hand, the existing LBO crystal frequency doubling heating furnace has a relatively simple structure. The LBO crystal installation cavity inside the furnace is not adjustable, making it very inconvenient to load and unload the LBO crystal. It cannot adapt to the rapid loading, unloading, and replacement of LBO crystals of different sizes. Moreover, LBO crystals of different sizes have different heat capacities. Using only a single heating rod and a single temperature sensor may result in insufficient temperature field uniformity. Furthermore, the different effective radiation ranges covering the heating unit may lead to uneven heating of different parts of the crystal. It may also cause thermal hysteresis or temperature fluctuation sensitivity during the heating or cooling process. Consequently, the temperature may deviate from the preset value for a long time due to untimely power adjustment or frequent temperature fluctuations due to excessive power adjustment.
[0006] Therefore, a new technical solution is proposed to solve the problems existing in the current technology. Summary of the Invention
[0007] The purpose of this invention is to provide an LBO crystal frequency doubling heating furnace for green laser therapy and its control method, so as to solve the problems of poor temperature uniformity and insufficient temperature control accuracy and reliability in the existing LBO crystal frequency doubling heating furnaces that require the replacement of LBO crystals of different sizes.
[0008] The technical solution of the present invention is: a green laser therapy machine LBO crystal frequency doubling heating furnace and its control method, comprising: a furnace body, the furnace body including a crystal support and a crystal frame cover for supporting the crystal support, the crystal support being provided with a crystal mounting cavity of variable volume, at least one heating unit being uniformly distributed in the circumferential direction of the crystal mounting cavity, at least one sensing unit being provided in the circumferential direction of the crystal mounting cavity, the total number of heating units and sensing units being greater than 2, the distance between any two adjacent sensing units being the same, and the sensing units being distributed in an axially symmetrical or centrally symmetrical manner.
[0009] Preferably, the crystal support has at least one heating mounting position, and a plurality of the heating mounting positions are centrally symmetrically distributed. The heating unit is detachably connected to the crystal support through the heating mounting positions.
[0010] Preferably, the crystal support has at least one sensor mounting position. When the number of heating mounting positions is greater than 1, the sensor mounting position is located between two adjacent heating mounting positions. When the number of heating mounting positions is equal to 1, at least two sensor mounting positions are located on both sides of the heating mounting positions. The sensor mounting positions are axially symmetrical or centrally symmetrically distributed. The sensing unit is detachably connected to the crystal support through the sensor mounting positions.
[0011] Preferably, the crystal support includes a first part, a second part, and a cavity adjuster. The first part and the second part are detachably connected. The crystal mounting cavity is formed by combining the first part and the cavity adjuster. The cavity adjuster slides relative to the second part in a vertical direction between the first part and the second part. The sliding distance of the cavity adjuster is limited by at least one fastener.
[0012] Preferably, the center of the crystal mounting cavity forms a 90° angle with the lines connecting the center of the heating unit mounting position and the center of the sensing unit mounting position in the first part.
[0013] Preferably, the crystal holder cover includes a sleeve and a fixed end that are fixedly connected to each other. The sleeve and the fixed end form a cavity for placing the crystal holder. The fixed end has a laser through hole, and the outer peripheral wall of the sleeve has at least one radially through locking hole.
[0014] Preferably, the second part has a guide groove, and the cavity adjusting component includes an adjusting body and a guide member that are fixedly connected. The cavity adjusting component slides along the guide groove via the guide member, and the peripheral wall of the second part has at least one radially penetrating fastening hole. Preferably, both the first part and the cavity adjustment component are provided with at least one heating mounting position and one sensing mounting position, wherein the heating mounting position and the sensing mounting position are axial through holes, and the heating mounting position and the sensing mounting position are arranged at circumferential intervals around the crystal mounting cavity.
[0015] This invention also discloses a control method for an LBO crystal frequency doubling heating furnace, applied to the LBO crystal frequency doubling heating furnace of the green laser therapy machine described in any of the above claims. When the number of sensing units is greater than 1, the method includes the following steps: S1. Record and calculate the average temperature value Ta of the collected values from multiple sensing units in real time, and calculate the difference Tm between the average temperature value Ta and the preset target temperature value. S2. The system adjusts the output power of the heating unit according to the difference Tm.
[0016] Preferably, when the number of sensing units is greater than 1, the method further includes the following step: M1, record and calculate the difference T1 between the collected values of any two sensing units in real time; M2. Determine the relationship between the difference T1 and the set safety threshold T0. When the difference T1 ≤ safety threshold T0, record and calculate the average temperature value Ta of the collected values from multiple sensing units. When the difference T1 > safety threshold T0, the system triggers an alarm to indicate a fault and shuts down the power output of the laser therapy machine.
[0017] Compared with the prior art, the advantages of the present invention are: (1) The LBO crystal frequency doubling heating furnace of the green laser therapy machine has a more flexible disassembly structure, which facilitates crystal installation, replacement and maintenance of heating and sensing units, and improves the efficiency of green laser therapy machine. Through cavity adjustment parts and fastener limit, it can flexibly adapt to the thermal characteristics requirements of LBO crystals of different sizes and can quickly install and replace LBO crystals, ensuring that the crystal can maintain stable frequency doubling efficiency and laser output performance after replacement.
[0018] (2) By using redundant design of heating unit and collecting average temperature value, temperature control performance is improved, further enhancing the operability, reliability and stability of medical laser equipment. Attached Figure Description
[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a perspective view of the LBO crystal frequency doubling furnace described in this invention after the LBO crystal has been installed. Figure 2 This is an exploded view of the LBO crystal frequency doubling furnace described in this invention; Figure 3 This is a cross-sectional view of the crystal frame outer cover described in this invention; Figure 4 This is a cross-sectional view of the LBO crystal frequency doubling furnace described in this invention; Figure 5 This is a schematic diagram of the control method for the LBO crystal frequency doubling furnace described in this invention.
[0020] The components are: 1. Crystal support; 11. First part; 12. Second part; 121. Guide groove; 122. Fastening hole; 13. Cavity adjustment component; 131. Adjustment body; 132. Guide component; 133. Fastener; 14. Crystal mounting cavity; 15. Heating mounting position; 151. Heating unit; 16. Sensor mounting position; 161. Sensor unit; 2. Crystal support cover; 21. Sleeve; 211. Set hole; 22. Fixed end; 221. Laser through hole; 23. Cavity body. Detailed Implementation
[0021] The present invention will be further described in detail below with reference to specific embodiments: like Figures 1-4 As shown, a green laser therapy machine (LBO) crystal frequency doubling heating furnace includes a furnace body, which includes a crystal support 1 and a crystal frame cover 2 for supporting the crystal support 1. The crystal support 1 includes a first part 11, a second part 12, and a cavity adjustment member 13. The first part 11 and the second part 12 are assembled and fixed. The first part 11 and the cavity adjustment member 13 combine to form a crystal mounting cavity 14. The cavity adjustment member 13 slides relative to the second part 12 in a vertical direction between the first part 11 and the second part 12. The peripheral wall of the second part 12 has at least one radially penetrating fastener. Hole 122, cavity adjustment component 13 limits the sliding distance by inserting at least one fastener 133 into the fastening hole 122. The second part 12 has a guide groove 121. Cavity adjustment component 13 includes an adjustment body 131 and a guide component 132 that are fixedly connected. Cavity adjustment component 13 slides along guide groove 121 through guide component 132 to ensure that LBO crystal always maintains the accuracy of center positioning during adjustment, avoids laser optical path misalignment caused by LBO crystal installation offset, ensures the effective interaction area between fundamental frequency light and crystal during frequency doubling, and thus improves frequency doubling conversion efficiency.
[0022] like Figure 2 and Figure 4As shown, both the first part 11 and the cavity adjustment component 13 are provided with at least one heating mounting position 15 and a sensing mounting position 16. The heating mounting position 15 and the sensing mounting position 16 are axial through holes. The heating mounting position 15 and the sensing mounting position 16 are arranged at intervals around the circumference of the crystal mounting cavity 14. At least one heating unit 151 is evenly distributed in the circumferential direction of the crystal mounting cavity 14, and at least one sensing unit 161 is also provided. The total number of heating units 151 and sensing units 161 is greater than 2. Any two The distance between adjacent sensing units 161 is the same. The sensing units 161 are axially symmetric or centrally symmetric. Different combinations of numbers can be used to optimize costs. For example, dual heating units 151 and a single sensing unit 161, or a single heating unit 151 and dual sensing units 161 can be used. The number of heating units 151 or sensing units 161 can also be increased. For example, the ratios of heating units 151 and sensing units 161 can be 3:2, 2:3, 3:3, 4:3, 3:4, 4:4, etc.
[0023] like Figure 2 and Figure 4 As shown, the crystal support 1 has at least one heating mounting position 15, and a plurality of heating mounting positions 15 are centrally symmetrically distributed. The heating unit 151 is mounted on the heating mounting position 15. The crystal support 1 has at least one sensing mounting position 16. When the number of heating mounting positions 15 is greater than 1, the sensing mounting position 16 is located between two adjacent heating mounting positions 15. When the number of heating mounting positions 15 is equal to 1, at least two sensing mounting positions 16 are located on both sides of the heating mounting position 15. The sensing mounting positions 16 are axially symmetrical or centrally symmetrically distributed. The sensing unit 161 is mounted on the sensing mounting position 16. In at least one embodiment, the center of the crystal mounting cavity 14 forms a 90° angle with the center of the heating mounting position 15 and the center of the sensing mounting position 16 of the first part 11, respectively. With the crystal mounting cavity 14 as the heat source center, heat is conducted from both sides to the LBO crystal, reducing the temperature difference between different areas of the LBO crystal and keeping the LBO crystal at the optimal non-critical phase matching temperature. Compared with the structure of a single heating unit 151, the frequency doubling conversion efficiency is improved by 20%, and the stability of the laser output power fluctuation amplitude during treatment is ensured. The layout of the sensing unit 161 makes the collected temperature data closer to the actual working temperature of the LBO crystal, enabling rapid heating at low temperatures and fine adjustment when approaching the target temperature, thereby shortening the preheating time, reducing the patient's waiting time, and improving the efficiency of diagnosis and treatment.
[0024] like Figure 2 and Figure 5 As shown, the control method of the LBO crystal frequency doubling furnace for green laser therapy includes the following steps when the number of sensing units 161 is greater than 1: S1. Record and calculate the average temperature value Ta of the collected values from multiple sensing units 161 in real time, and calculate the difference Tm between the average temperature value Ta and the target temperature value Tb. S2. The system adjusts the output power of the heating unit 151 according to the difference Tm.
[0025] When the number of sensing units 161 is greater than 1, the following steps are also included: M1, Real-time recording and calculation of the difference T1 between the acquired values of any two sensing units 161; M2. Determine the relationship between the difference T1 and the set safety threshold T0. When the difference T1 ≤ the safety threshold T0, the average temperature value Ta of the collected values of multiple sensing units 161 is recorded and calculated normally. When the difference T1 > the safety threshold T0, the system triggers an alarm to indicate a fault and shuts down the power output of the laser therapy machine.
[0026] Example
[0027] like Figures 1-4 As shown, a green laser therapy machine LBO crystal frequency doubling heating furnace has a furnace body made of brass with good thermal conductivity. The furnace body includes a crystal support 1 and a crystal frame cover 2 for supporting the crystal support 1. The crystal support 1 and the crystal frame cover 2 are assembled into a detachable furnace body. The crystal support 1 is a detachable structure, and the size of the crystal mounting cavity 14 can be adjusted to facilitate the installation and replacement of the LBO crystal. The crystal support 1 includes a first part 11, a second part 12, and a cavity adjustment component 13. The first part 11 and the cavity adjustment component 13 combine to form the crystal mounting cavity 14. The cavity adjustment component 13 slides relative to the second part 12 in the vertical direction between the first part 11 and the second part 12. The sliding distance of the cavity adjustment component 13 is limited by at least one fastener 133. The heating unit 151 is a heating rod, and the sensing unit 161 is a PT100 temperature sensor. The first part 11 and the cavity adjustment component 13 have axial through holes as mounting positions for the heating unit 151 and the sensing unit 161. The four mounting positions are centrally symmetrically distributed. The heating unit 151 and the sensing unit 161 form a diagonal layout. Two heating units 151 are placed diagonally opposite each other, and the remaining two diagonal mounting positions are used to place the sensing units 161. The center of the crystal mounting cavity 14 forms a 90° angle with the center of the heating mounting position 15 and the center of the sensing mounting position 16 of the first part 11, respectively. The surface temperature difference of each region of the LBO crystal is ≤0.05℃, so that the LBO crystal is at the optimal non-critical phase matching temperature. Compared with the structure of a single heating unit 151, the frequency doubling conversion efficiency is improved by 20%.
[0028] like Figure 2 and Figure 4As shown, both the first part 11 and the second part 12 are machined into semi-cylinders and assembled and fixed by four pan head screws. The LBO crystal is a cuboid with square end faces. A triangular prism groove is machined at the center of the splicing surface of the first part 11 and the cavity adjustment component 13. The variable volume crystal mounting cavity 14 is formed by combining the first part 11 and the cavity adjustment component 13. The inner sidewall of the crystal mounting cavity 14 is machined into an inclined surface with an angle of 90° between two adjacent inclined surfaces. The four sidewalls of the LBO crystal are completely fitted with the four inner sidewalls of the crystal mounting cavity 14, which facilitates the heat transfer from the first part 11 and the cavity adjustment component 13 to the LBO crystal, realizing LBO. The rapid heating of the LBO crystal is achieved by creating a square positioning groove at the inner edge where two adjacent inclined surfaces meet. When the LBO crystal is placed in the crystal mounting cavity 14, the positioning groove strengthens the fixation of the LBO crystal and protects its edges from direct collisions. The second part 12 has a guide groove 121. The cavity adjustment component 13 includes a fixedly connected adjustment body 131 and two guides 132. The adjustment body 131 has a U-shaped cross-section, and the guides 132 are cuboids located on both sides of the adjustment body 131. The cavity adjustment component 13 slides along the guide groove 121 via the guides 132, with a sliding stroke of 2mm. This adjustment stroke can adapt to and fix different... The LBO crystal of the specified size has at least one radially penetrating fastening hole 122 on its peripheral wall for fixing the LBO crystal. The crystal holder cover 2 includes a sleeve 21 and a fixed end 22 that are fixedly connected to each other. The crystal holder cover 2 is machined from a cylinder by machining a cavity. The annular sleeve 21 and the circular fixed end 22 form a cavity 23 for placing the crystal holder 1. The cavity 23 has a diameter of 24 mm. After machining, the cavity 23 is not completely penetrating. The fixed end 22 is located at the tail end of the sleeve 21 and is used to place and limit the crystal holder 1. The thickness of the fixed end 22 is 1 mm. A laser through hole 221 with a diameter of 12 mm is opened in the center of the fixed end 22. The 1064nm fundamental frequency light passes through the laser through-hole 221 and strikes the LBO crystal. After the LBO crystal frequency-doubles the fundamental frequency light, it forms a 532nm green laser. The stable green laser output power and wavelength ensure the accuracy of energy transfer in clinical treatment. The outer peripheral wall of the sleeve 21 has at least one radially penetrating locking hole 211. The locking hole 211 is a threaded hole. The crystal support 1 is fixed by tightening the locking screw with the locking hole 211 to prevent the LBO crystal from moving relative to the crystal support outer cover 2. The crystal support outer cover 2 stably limits the position of the crystal support 1. The laser through-hole 221 precisely limits the optical path channel, reduces the risk of laser leakage or scattering, and further improves the safety of laser treatment.
[0029] like Figure 2 and Figure 5As shown, the LBO crystal frequency doubling heater of the green laser therapy machine is controlled by the main control system. A target temperature value Tb is set through the human-machine interface of the main control system. Two sensing units 161 input the sampled signals to the temperature sampling circuit of the main control system. The main control system uses an STM32 microprocessor, whose built-in program continuously reads the temperature measurements from the temperature sampling circuit and provides feedback. The average temperature Ta is then calculated using the feedback temperature value. The average temperature Ta is considered the actual temperature of the LBO crystal frequency doubling heater. The average temperature Ta of the two sensing units 161 is then obtained and compared with the preset target temperature value Tb. After calculating the error "error", the PID algorithm is activated. The system software of the main control system obtains the PID negative feedback calculation output value, processes it to generate a corresponding PWM modulation duty cycle signal, and drives the power MOSFET to adjust the duty cycle of the power supply voltage to the two heating units 151, thereby controlling the power of the two heating units 151. When the average temperature value Ta is too low, the duty cycle is increased to increase the power of the two heating units 151; when the average temperature value Ta is too high, the duty cycle is decreased to reduce the power of the two heating units 151. Through PID negative feedback regulation based on the average temperature value Ta of the two temperature sensors, and the simultaneous operation of the two heating units 151 to heat the LBO crystal, the furnace can quickly reach the target temperature and accurately stabilize at the preset target temperature value Tb, providing a uniform and stable frequency doubling temperature environment for the LBO crystal. This reduces the preheating waiting time of the green laser therapy machine, enabling the green laser therapy machine to produce a faster response speed, higher efficiency, and more stable 532nm green laser.
[0030] like Figure 2 and Figure 5 As shown, the main control system software, while sampling the temperature of the two sensing units 161, also adds cross-validation logic for the sampled temperature: it compares the difference in readings between the two temperature sensors in real time. When the difference T1 between the two temperature sensors exceeds the preset safety threshold T0, the system triggers an audible alarm and displays a sensor fault message on the interface, while simultaneously stopping the power output of the laser therapy machine. Based on the feedback of the average temperature value Ta, the main control system software can stably control the furnace temperature within a range of ±0.1°C or even higher precision, further ensuring that the LBO crystal is at its optimal phase-matching temperature, providing a reliable guarantee for the stable output of the green laser therapy machine. Sensing unit 161 not only improves the accuracy and reliability of the sampled temperature but also constructs a hardware safety redundancy mechanism. When any sensing unit 161 fails, the system can immediately detect and alarm, avoiding treatment interruptions or medical risks caused by a single component failure.
[0031] The above embodiments are merely illustrative of the technical concept and features of the present invention, intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly, and should not be construed as limiting the scope of protection of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of the present invention is defined by the appended claims rather than the foregoing description, and thus all changes falling within the meaning and scope of the equivalents of the claims are intended to be included within the present invention.
Claims
1. A green laser therapy machine with an LBO crystal frequency doubling heating furnace, characterized in that, include: The furnace body includes a crystal support (1) and a crystal frame cover (2) for supporting the crystal support (1). The crystal support (1) is provided with a crystal mounting cavity (14) with variable volume. At least one heating unit (151) is evenly distributed in the circumferential direction of the crystal mounting cavity (14). At least one sensing unit (161) is provided in the circumferential direction of the crystal mounting cavity (14). The total number of heating units (151) and sensing units (161) is greater than 2. The distance between any two adjacent sensing units (161) is the same. The sensing units (161) are distributed in an axially symmetrical or centrally symmetrical manner.
2. The LBO crystal frequency doubling heating furnace for green laser therapy according to claim 1, characterized in that: The crystal support (1) has at least one heating mounting position (15), and several heating mounting positions (15) are centrally symmetrically distributed. The heating unit (151) is detachably connected to the crystal support (1) through the heating mounting position (15).
3. The LBO crystal frequency doubling heating furnace for green laser therapy according to claim 2, characterized in that: The crystal support (1) has at least one sensor mounting position (16). When the number of heating mounting positions (15) is greater than 1, the sensor mounting position (16) is located between two adjacent heating mounting positions (15). When the number of heating mounting positions (15) is equal to 1, at least two sensor mounting positions (16) are located on both sides of the heating mounting position (15). The sensor mounting positions (16) are axially symmetrical or centrally symmetrical. The sensing unit (161) is detachably connected to the crystal support (1) through the sensor mounting positions (16).
4. The LBO crystal frequency doubling heating furnace for green laser therapy according to claim 3, characterized in that: The crystal support (1) includes a first part (11), a second part (12) and a cavity adjustment member (13). The first part (11) and the second part (12) are detachably connected. The crystal mounting cavity (14) is formed by combining the first part (11) and the cavity adjustment member (13). The cavity adjustment member (13) slides relative to the second part (12) in a vertical direction between the first part (11) and the second part (12). The cavity adjustment member (13) limits the sliding distance by at least one fastener (133).
5. The LBO crystal frequency doubling heating furnace for green laser therapy according to claim 4, characterized in that: The center of the crystal mounting cavity (14) forms a 90° angle with the center of the heating mounting position (15) and the center of the sensing mounting position (16) of the first part (11).
6. The LBO crystal frequency doubling heating furnace for green laser therapy according to claim 1, characterized in that: The crystal holder cover (2) includes a sleeve (21) and a fixed end (22) that are fixedly connected to each other. The sleeve (21) and the fixed end (22) form a cavity (23) for placing the crystal holder (1). The fixed end (22) has a laser through hole (221). The outer peripheral wall of the sleeve (21) has at least one radially through locking hole (211).
7. The LBO crystal frequency doubling heating furnace for green laser therapy according to claim 4, characterized in that: The second part (12) has a guide groove (121). The cavity adjustment component (13) includes an adjustment body (131) and a guide component (132) that are fixedly connected. The cavity adjustment component (13) slides along the guide groove (121) through the guide component (132). The peripheral wall of the second part (12) has at least one radially penetrating fastening hole (122).
8. The LBO crystal frequency doubling heating furnace for green laser therapy according to claim 4, characterized in that: The first part (11) and the cavity adjustment component (13) are each provided with at least one heating mounting position (15) and a sensing mounting position (16). The heating mounting position (15) and the sensing mounting position (16) are axial through holes. The heating mounting position (15) and the sensing mounting position (16) are arranged at circumferential intervals in the crystal mounting cavity (14).
9. A control method for an LBO crystal frequency doubling heating furnace of a green laser therapy machine, applied to the LBO crystal frequency doubling heating furnace of the green laser therapy machine according to any one of claims 1-8, characterized in that, When the number of sensing units (161) is greater than 1, the following steps are included: S1. Real-time recording and calculation of the average temperature value Ta of the collected values of multiple sensing units (161), and calculation of the difference Tm between the average temperature value Ta and the preset target temperature value. S2. The system adjusts the output power of the heating unit (151) according to the difference Tm.
10. The control method for the LBO crystal frequency doubling heating furnace of the green laser therapy machine as described in claim 9, characterized in that, When the number of sensing units (161) is greater than 1, the following steps are also included: M1, record and calculate the difference T1 between the acquired values of any two sensing units (161) in real time; M2. Determine the relationship between the difference T1 and the set safety threshold T0. When the difference T1 ≤ the safety threshold T0, record and calculate the average temperature value Ta of the collected values of multiple sensing units (161). When the difference T1 > the safety threshold T0, the system triggers an alarm to indicate the fault and shuts down the power output of the laser therapy machine.