Laser thermal stability maintaining method, laser power supply system and laser

Abstract

The invention relates to a laser thermal stability maintaining method, a laser power supply system and a laser. The method comprises the following steps: acquiring the current light emitting frequency of a light emitting pulse signal of a laser; in response to the fact that the current light emitting frequency is smaller than a preset frequency threshold value, a preheating pulse string signal is generated before the light emitting pulse signal is generated; wherein the total power generated by the laser under the driving of the preheating pulse string signal and the light-emitting pulse signal is maintained within a preset thermal stable power interval. The method can overcome the thermal penetration effect of the laser crystal and improve the thermal stability of the laser.

Description

Technical Field

[0001] The present application relates to the field of laser technology, and in particular to a method for maintaining thermal stability of a laser, a laser power supply system, and a laser. Background Art

[0002] As a new light source, lasers have broad applications in various fields. There are many types of lasers. For example, Nd:YAG lasers, which use xenon lamps as pump sources, occupy a large share of the laser market. Crystal thermal stability is a key performance indicator for solid-state lasers, significantly impacting output power, beam quality, and overall stability.

[0003] In traditional technology, the principle of laser generation by xenon lamp-pumped solid-state lasers is as follows: the power control circuit generates a pulse drive signal to drive the IGBT switch in the discharge circuit, applying a pulse current to the xenon lamp to cause it to emit pulsed light, which then illuminates the laser crystal to generate laser light. However, the efficiency of solid-state lasers is very low. Only a small portion of the total energy input to the pump lamp is converted into laser output, and the vast majority of the pump energy is converted into heat loss in the lamp. Most of the electrical energy consumed when generating laser light is converted into heat energy. In addition, due to the different light output frequencies and pulse widths required for laser operation, that is, different powers and heat, different deformations of the laser crystal occur, resulting in a thermal seepage effect. This thermal seepage effect affects the spot size and beam quality, and can seriously affect the effectiveness of laser treatment, especially for lasers in the medical field. Summary of the Invention

[0004] Based on this, it is necessary to provide a laser thermal stability maintenance method, a laser power supply system and a laser that can improve the thermal stability of the laser crystal in order to address the above technical problems.

[0005] In a first aspect, a method for maintaining thermal stability of a laser is provided, the method comprising:

[0006] Obtain the current output frequency of the laser's light pulse signal;

[0007] In response to the current light output frequency being less than a preset frequency threshold, a preheating pulse train signal is generated before the light emitting pulse signal is generated; wherein, the total power generated by the laser driven by the preheating pulse train signal and the light emitting pulse signal is maintained within a preset thermal stability power range.

[0008] In some embodiments, the method further includes: determining whether the current total power of the laser is lower than the lower limit of a preset thermal stability power range; if so, entering the step of generating a preheating pulse train signal before generating a light-emitting pulse signal; if not, stopping generating the preheating pulse train signal.

[0009] In some embodiments, generating a preheating pulse train signal includes: generating a plurality of sub-pulses using a driving control device; and forming a pulse group with the plurality of sub-pulses, forming a pulse cluster with the plurality of pulse groups, and forming a preheating pulse train signal with at least one pulse cluster.

[0010] In some embodiments, the interval between sub-pulses in each pulse group is a first interval, the interval between pulse groups in each pulse cluster is a second interval, and the interval between each pulse cluster is a third interval; wherein the first interval is smaller than the second interval, and the second interval is smaller than the third interval.

[0011] In some embodiments, the frequency of the sub-pulses is greater than the frequency of the pulse groups, and the frequency of the pulse groups is greater than the frequency of the pulse clusters.

[0012] In some embodiments, the drive control device includes a single-chip microcomputer, and the drive control device is used to generate multiple sub-pulses, including: obtaining period information of the drive pulse by configuring the frequency division information and reloading information of the timer of the drive control device, and obtaining sub-pulses by controlling the number, frequency and duty cycle of the drive pulse; wherein the driving power of the sub-pulse is less than the light emission threshold of the laser.

[0013] In some embodiments, the method further includes: inserting n driving pulses with a duty cycle of zero between each pulse group to space each pulse group, and inserting m driving pulses with a duty cycle of zero between each pulse group to space each pulse cluster; wherein n and m are positive integers, and m is greater than n.

[0014] In some embodiments, the method further includes: inserting a re-preheating pulse train signal between the preheating pulse train signal before the light-emitting pulse signal and the light-emitting pulse signal; wherein the interval between the re-preheating pulse train signal and the light-emitting pulse signal is smaller than the interval between the re-preheating pulse train signal and the preheating pulse train signal.

[0015] In a second aspect, a laser power supply system is provided, which includes a charging circuit, an energy storage capacitor network, a high-voltage trigger circuit, a drive control device, a simmer maintenance circuit, and a pump source; wherein the simmer maintenance circuit includes an insulated gate bipolar transistor element; wherein,

[0016] a charging circuit, for charging the energy storage capacitor network;

[0017] A high-voltage trigger circuit is used to output a trigger voltage to the pump source to ionize the inert gas inside the pump source;

[0018] an energy storage capacitor network, configured to discharge energy to a pump source according to a light emitting pulse signal; and

[0019] A drive control device is used to send a light-emitting pulse signal and a preheating pulse train signal to an insulated gate bipolar transistor element in a pre-ignition maintenance circuit according to any one of the laser thermal stability maintenance methods of the first aspect.

[0020] According to a third aspect, a laser is provided, comprising the laser power supply system according to the second aspect.

[0021] The above-mentioned laser thermal stability maintenance method, laser power supply system and laser, when the current light output frequency of the laser is lower than the preset frequency threshold, generates a preheating pulse train signal and mixes the preheating pulse train signal with the light-emitting pulse signal, thereby performing thermal compensation for the low-frequency light output working condition, that is, increasing the total power generated by the laser, and regulating the total power of the laser driven by the preheating pulse train signal and the light-emitting pulse signal to be maintained within the thermal stability power range, so that the energy consumption of the laser increases while the light output frequency remains unchanged, thereby overcoming the thermal penetration effect of the laser crystal, improving the thermal stability of the laser, and thus improving the stability of the laser spot emitted by the laser. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Schematic diagram of the structure of the laser power supply system in some embodiments;

[0023] Figure 2 A schematic flow chart of a method for maintaining laser thermal stability in some embodiments;

[0024] Figure 3 A schematic diagram of the structure of a preheating pulse train signal in some embodiments;

[0025] Figure 4 Schematic diagram of the relationship between the preheating pulse train signal, the re-preheating pulse train signal, and the light-emitting pulse signal in some embodiments;

[0026] Figure 5 FIG. 1 is a schematic structural diagram of a pre-ignition maintenance circuit in one embodiment. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0028] The following describes the application scenarios of the laser thermal stability maintenance method involved in this application. Figure 1 As shown, Figure 1 The schematic diagram of the structure of the laser power supply system to which the laser thermal stability maintenance method is applied in some embodiments is shown. The laser thermal stability maintenance method provided in this application can be applied to Figure 1The laser power supply system shown.

[0029] Specifically, the laser power supply system includes a charging circuit 10, an energy storage capacitor network 20, a high-voltage trigger circuit 30, a drive control device 40, a simmer maintenance circuit 60 and a pump source 50; wherein the simmer maintenance circuit 60 includes an insulated gate bipolar transistor element; wherein,

[0030] a charging circuit 10 for charging the energy storage capacitor network 20;

[0031] The high-voltage trigger circuit 30 is used to output a trigger voltage to the pump source 50 to ionize the inert gas inside the pump source 50;

[0032] an energy storage capacitor network 20, configured to discharge energy to the pump source according to the light emitting pulse signal; and

[0033] The driving control device 40 is used to send a light-emitting pulse signal and a preheating pulse train signal to the insulated gate bipolar transistor element in the pre-ignition maintenance circuit 60.

[0034] More specifically, it is used to obtain the current light-emitting frequency of the laser's light-emitting pulse signal; in response to the current light-emitting frequency being less than a preset frequency threshold, a preheating pulse train signal is generated before the light-emitting pulse signal is generated, wherein the preheating pulse train signal and the light-emitting pulse signal drive the insulated gate bipolar transistor element (IGBT) of the discharge circuit (pre-ignition maintenance circuit 60) in the laser driving power supply system, so that the IGBT is turned on, thereby driving the total power generated by the laser to be maintained within a preset thermal stability power range.

[0035] In some embodiments, the drive control device may include a single-chip microcomputer, or may include a drive control device based on an MCU (Microcontroller Unit), etc., and may further include a processor, a memory and other devices, wherein the memory is used to store computer instructions, and the processor or the control unit is used to execute the computer instructions to obtain the current light output frequency of the laser's light pulse signal; in response to the current light output frequency being less than a preset frequency threshold, a preheating pulse train signal is generated before the light pulse signal is generated; wherein, under the driving of the laser by the preheating pulse train signal and the light pulse signal, the total power generated by the laser is maintained within a preset thermal stability power range.

[0036] Because when the laser light output frequency is high (for example: 100HZ), its total power is relatively large, and when the light output frequency is low (for example: 5HZ), its total power is also small, low-frequency and high-frequency light output will cause the laser crystal to have a large thermal effect deformation, and the reason is caused by the inconsistency between the internal and surface temperatures of the laser crystal. However, when the total power of the laser reaches a certain preset value, the thermal effect deformation of the laser crystal is relatively small. At this time, it can be considered that the laser crystal has reached the thermal stability range, the total power generated by the laser has reached the thermal stability power range, and the spot size of the laser emitted by the laser tends to be consistent. The scheme involved in this application can perform heat compensation for the working condition of low-frequency light output, that is, increase the total power of the laser light output, so that no matter which light output frequency is used, the total power generated by the laser can be maintained to reach the thermal stability power range, thereby maintaining the laser crystal in a thermally stable state.

[0037] Therefore, the above-mentioned laser power supply system involved in the embodiment of the present application, when the current light emission frequency of the light emitting pulse signal is low, that is, when the current total power of the laser is lower than the lower limit of the preset thermal stability power range, generates a preheating pulse train signal through the driving control device, and mixes the preheating pulse train signal with the light emitting pulse signal, thereby performing thermal compensation for the low-frequency light emission working condition, that is, increasing the total power generated by the laser, and controlling the total power generated by the laser under the drive of the preheating pulse train signal and the light emitting pulse signal to be maintained within the thermal stability power range, so that the energy consumption of the laser increases while the light emission frequency remains unchanged, thereby overcoming the thermal penetration effect of the laser crystal, improving the thermal stability of the laser, and improving the stability of the laser spot emitted by the laser.

[0038] In some embodiments, as Figure 2 As shown, Figure 2 A schematic flow chart of a method for maintaining laser thermal stability in some embodiments is shown, which may specifically include the following steps:

[0039] Step S202: obtaining the current light output frequency of the laser light pulse signal;

[0040] In this step, the laser can be configured with multiple output frequencies to support laser operations at various frequencies. For example, different output frequencies can be assigned to different output modes. More specifically, the output frequency for the currently selected mode can be determined by identifying the current user-selected mode and using it as the current output frequency.

[0041] Step S204: In response to the current light output frequency being less than a preset frequency threshold, a preheating pulse train signal is generated before the light emitting pulse signal is generated; wherein, driven by the preheating pulse train signal and the light emitting pulse signal, the total power generated by the laser is maintained within a preset thermal stability power range.

[0042] In this step, when the current light-emitting frequency of the laser is less than the preset frequency threshold, that is, when the laser emits light at a lower frequency, the laser crystal cannot reach a thermally stable state due to insufficient energy absorption, resulting in unstable and uneven laser spot. Therefore, a preheating pulse train signal is generated before the light-emitting pulse signal and doped with the light-emitting pulse signal to thermally compensate the light-emitting pulse signal, and the total power generated by the laser under the drive of the preheating pulse train signal and the light-emitting pulse signal is controlled to be maintained within the thermally stable power range.

[0043] The preheating pulse train signal is a pulse train signal used for energy compensation. Each sub-pulse in the preheating pulse train signal does not achieve the desired light emission effect. In other words, the driving power at the pulse width and frequency of each sub-pulse is less than the laser's laser emission threshold. Therefore, thermal compensation can be achieved without interfering with or generating excess light. The thermally stable power range refers to the power range that can maintain the laser crystal in the laser in a thermally stable state to overcome the heat-through effect.

[0044] In an actual working scenario, after the laser is started, if the current light-emitting frequency of the laser is at a low gear, that is, the current light-emitting frequency is lower than the preset frequency threshold, it can enter the preheating mode. At this time, the preheating pulse train signal can be continuously generated by the driving control device and applied to the switch IGBT of the laser's discharge circuit, thereby driving the laser's pump source to emit pulsed light. The pulsed light of the pump source irradiates the laser crystal, causing the laser crystal to be preheated. After receiving the user's light-emitting instruction, a light-emitting pulse signal is generated by the driving control device. Since the laser crystal has been preheated, the laser crystal can reach a thermally stable state. At this time, driven by the preheating pulse train signal and the light-emitting pulse signal, the total power generated by the laser can be maintained within the preset thermally stable power range. Therefore, the consistency and stability of the laser spot size emitted by the laser can be improved.

[0045] In the above-mentioned embodiment, when the current light emission frequency of the laser is lower than the preset frequency threshold, a preheating pulse train signal is generated and the preheating pulse train signal is mixed with the light-emitting pulse signal, thereby performing thermal compensation for the low-frequency light emission working condition, that is, increasing the total power generated by the laser, and regulating the total power of the laser driven by the preheating pulse train signal and the light-emitting pulse signal to be maintained within the thermally stable power range, so that the energy consumption of the laser increases while the light emission frequency remains unchanged, thereby overcoming the thermal penetration effect of the laser crystal, improving the thermal stability of the laser, and thus improving the stability of the laser spot emitted by the laser.

[0046] In some embodiments, the method further includes: determining whether the current total power of the laser is lower than the lower limit of a preset thermal stability power range; if so, entering the step of generating a preheating pulse train signal before generating a light-emitting pulse signal; if not, stopping generating the preheating pulse train signal.

[0047] In this embodiment, under normal circumstances, the higher the current light output frequency of the laser, the greater the current total power of the laser, and vice versa. Specifically, the current total power of the laser can be dynamically calculated and compared with the lower limit of the preset thermal stability power interval to determine whether the current total power of the laser has reached the thermal stability power interval. If the current total power of the laser has not reached the thermal stability power interval, that is, the current total power is lower than the lower limit of the preset thermal stability power interval, a preheating pulse train signal is generated for thermal compensation. If the current total power of the laser has reached the thermal stability power interval, that is, the current total power is higher than the lower limit of the preset thermal stability power interval, the generation of the preheating pulse train signal can be stopped. By dynamically judging the total power of the laser light, it is possible to dynamically control whether to add the preheating pulse train signal according to the different light output conditions of different gears of the laser, so that the operation of the laser is more stable.

[0048] In some embodiments, generating a preheating pulse train signal includes: generating a plurality of sub-pulses using a driving control device; and forming a pulse group with the plurality of sub-pulses, forming a pulse cluster with the plurality of pulse groups, and forming a preheating pulse train signal with at least one pulse cluster.

[0049] In this embodiment, you can refer to Figure 3 As shown, the preheating pulse train signal can adopt a multi-level nested structure, such as Figure 3 As shown, the circled content in the figure is an enlarged view of the content indicated by the corresponding arrow. More specifically, a drive control device can be used to generate multiple sub-pulses 10 (first-level signal) at the first-level frequency. Every s sub-pulses form a group to generate a pulse group 20 (second-level signal), and the frequency of the pulse group 20 is the second-level frequency. Every t pulse groups 20 form a group to generate a pulse cluster 30 (third-level signal), and the frequency of the pulse cluster 30 is the third-level frequency. At least one pulse cluster 30 constitutes a preheating pulse train signal. Wherein, s and t are positive integers greater than 1. Preferably, t is greater than s.

[0050] In some embodiments, the frequency of the sub-pulses is greater than the frequency of the pulse groups, and the frequency of the pulse groups is greater than the frequency of the pulse clusters, that is, the first-level frequency is greater than the second-level frequency, and the second-level frequency is greater than the third-level frequency.

[0051] In some embodiments, continue to refer to Figure 3As shown, the interval between the sub-pulses 10 in each pulse group 20 is a first interval 101, the interval between the pulse groups 20 in each pulse cluster 30 is a second interval 201, and the interval between each pulse cluster 30 is a third interval 301; wherein, the first interval 101 is smaller than the second interval 201, and the second interval 201 is smaller than the third interval 301.

[0052] The above-mentioned embodiment, by constructing a preheating pulse train signal with a multi-level inclusion structure, can make the preheating pulse train signal more stable, thereby improving the thermal stability of the laser crystal. Moreover, by controlling the interval between pulses at each level, the driving power of the preheating pulse train signal can be adjusted, thereby achieving flexible adjustment of the thermal compensation of the laser crystal.

[0053] In some embodiments, the drive control device includes a single-chip microcomputer, and the drive control device is used to generate multiple sub-pulses, including: obtaining the period information of the drive pulse by configuring the frequency division information and reloading information of the timer of the single-chip microcomputer, and obtaining the sub-pulses by controlling the number, frequency and duty cycle of the drive pulses; wherein the driving power of the sub-pulse is less than the light emission threshold of the laser.

[0054] The above embodiment, for example, can be generated by using a stm32 microcontroller or other modulation waveform generator using DMA (Direct Memory Access) to generate the following Figure 3 The PWM (Pulse-width modulation) driving pulse shown can obtain sub-pulses for constructing a preheating pulse train by setting appropriate timer frequency division information and reload information, and adjusting the number, frequency and duty cycle of the driving pulses.

[0055] In some embodiments, the method further includes: inserting n driving pulses with a duty cycle of zero between each pulse group to space each pulse group, and inserting m driving pulses with a duty cycle of zero between each pulse group to space each pulse cluster; wherein n and m are positive integers, and m is greater than n.

[0056] In this embodiment, since the period and size of the driving pulse generated by the single-chip microcomputer are constant, the duty cycle can be adjusted, in particular, by inserting a driving pulse with a duty cycle of zero between each pulse group to space each pulse group, and inserting a driving pulse with a duty cycle of zero between each pulse group to space each pulse cluster, thereby realizing a preheating pulse train signal with a multi-level inclusion structure that can be flexibly adjusted and has a variable frequency.

[0057] In this embodiment, a single-chip microcomputer with simple configuration and low cost is adopted as a driving control device, and a single-chip microcomputer that can only emit constant-period pulses is used to construct a preheating pulse train signal with multi-level frequency and multi-level inclusion structure. While reducing the cost of the equipment, the flexibility of dynamic adjustment of the preheating pulse train signal is improved. For example, the frequency of the preheating pulse train signal can be flexibly controlled by adjusting the number of pulse groups of the preheating pulse train signal, the interval between sub-pulses, the interval between pulse groups, the interval between pulse clusters, etc., so that the total power of the laser driven by the preheating pulse train signal and the light-emitting pulse signal is maintained within a preset thermal stability power range. Therefore, the dynamic adjustment capability of the thermal stability of the laser crystal can be improved.

[0058] In some embodiments, reference Figure 4 As shown, Figure 4 A schematic diagram shows the relationship between the preheating pulse train signal, the re-preheating pulse train signal and the light-emitting pulse signal in some embodiments.

[0059] Specifically, the method also includes: inserting a re-preheating pulse train signal 200 between the preheating pulse train signal 100 before the luminous pulse signal 300 and the luminous pulse signal 300; wherein the interval 402 between the re-preheating pulse train signal 200 and the luminous pulse signal 300 is smaller than the interval 401 between the re-preheating pulse train signal 200 and the preheating pulse train signal 100.

[0060] In this embodiment, a reheat pulse train signal with a higher frequency and narrower pulse width is added between the light-emitting pulse signals. This reheat pulse train signal can enhance the pumping effect on the crystal, thereby improving pumping efficiency and further enhancing the stability of laser operation. For example, a reheat pulse train signal can be connected between each light-emitting pulse signal, and the frequency of the reheat pulse train signal is greater than that of the preheat pulse train signal.

[0061] In some embodiments, a laser power supply system is also provided, which can be referred to Figure 1 As shown, the description of the laser power supply system can be found above and will not be repeated here.

[0062] In some embodiments, reference Figure 5 As shown, Figure 5 The schematic diagram of the structure of the pre-ignition maintenance circuit in some embodiments is shown, wherein after the laser enters the preheating stage, Figure 5 The insulated gate bipolar transistor (IGBT) element in the laser diode applies a high-frequency, narrow-pulse-width preheating pulse train signal, causing the xenon lamp (pump source) to emit pulsed light to heat the laser crystal, bringing it to a thermally stable range, thereby overcoming the thermal lens effect and keeping the laser spot size essentially unchanged.

[0063] In some embodiments, the laser power supply system may further include a pulse limiting circuit, which can be used to limit the pulse width of the sub-pulses in the preheating pulse train signal so that the pulse width of the sub-pulses of the preheating pulse train signal reaches a preset standard, thereby avoiding the pulse width of the sub-pulses being too wide and generating unnecessary laser output, that is, further avoiding unnecessary laser output while compensating for energy.

[0064] In some embodiments, a laser is also provided, which includes the above-mentioned laser power supply system. The laser can be a solid laser, for example, a pulsed erbium laser (YAG), which can be used in laser beauty, laser therapy and other fields.

[0065] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A method for maintaining thermal stability of a laser, the method comprising: Obtain the current light output frequency of the laser's light pulse signal; In response to the current light output frequency being less than a preset frequency threshold, a preheating pulse train signal is generated before the light emitting pulse signal is generated; wherein, under the drive of the preheating pulse train signal and the light emitting pulse signal, the total power generated by the laser is maintained within a preset thermal stability power range.

2. The method according to claim 1, characterized in that The method further comprises: Determine whether the current total power of the laser is lower than the preset lower limit of the thermal stability power range; if so, enter the step of generating a preheating pulse train signal before generating a light-emitting pulse signal; if not, stop generating the preheating pulse train signal.

3. The method according to claim 1, characterized in that The generating of the preheating pulse train signal comprises: generating a plurality of sub-pulses using a drive control device; and A plurality of the sub-pulses constitute a pulse group, a plurality of the pulse groups constitute a pulse cluster, and at least one pulse cluster constitutes the preheating pulse train signal.

4. The method according to claim 3, characterized in that The interval between the sub-pulses in each of the pulse groups is a first interval, the interval between the pulse groups in each of the pulse clusters is a second interval, and the interval between the pulse clusters is a third interval; wherein, the first interval is smaller than the second interval, and the second interval is smaller than the third interval.

5. The method according to claim 3, characterized in that The frequency of the sub-pulses is greater than the frequency of the pulse group, and the frequency of the pulse group is greater than the frequency of the pulse cluster.

6. The method according to claim 3, characterized in that The drive control device includes a single chip microcomputer, and the method of generating a plurality of sub-pulses by using the drive control device includes: By configuring the frequency division information and reloading information of the timer of the drive control device, the period information of the drive pulse is obtained, and by controlling the number, frequency and duty cycle of the drive pulse, the sub-pulse is obtained; wherein the driving power of the sub-pulse is less than the light emission threshold of the laser.

7. The method according to claim 6, characterized in that The method further comprises: Insert n driving pulses with a duty cycle of zero between each pulse group to space each pulse group, and insert m driving pulses with a duty cycle of zero between each pulse group to space each pulse cluster; wherein n and m are positive integers, and m is greater than n.

8. The method according to claim 1, characterized in that The method further comprises: A re-preheat pulse train signal is inserted between the preheat pulse train signal before the light-emitting pulse signal and the light-emitting pulse signal; wherein the interval between the re-preheat pulse train signal and the light-emitting pulse signal is smaller than the interval between the re-preheat pulse train signal and the preheat pulse train signal.

9. A laser power supply system, comprising a charging circuit, an energy storage capacitor network, a high-voltage trigger circuit, a drive control device, a simmer maintenance circuit, and a pump source; wherein: The simmering maintenance circuit includes an insulated gate bipolar transistor element; wherein, The charging circuit is used to charge the energy storage capacitor network; The high-voltage trigger circuit is used to output a trigger voltage to the pump source to ionize the inert gas inside the pump source; The energy storage capacitor network is used to discharge to the pump source according to the light emitting pulse signal; and The drive control device is used to send a light-emitting pulse signal and a preheating pulse train signal to the insulated gate bipolar transistor element in the pre-ignition maintenance circuit according to the laser thermal stability maintenance method according to any one of claims 1 to 8. 10 . A laser comprising the laser power supply system according to claim 9 .

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