Power stabilizing method and adjusting system of frequency doubling laser

Abstract

The invention discloses a power stabilizing method and an adjusting system of a frequency doubling laser. The stabilizing method comprises the following steps: acquiring the actual output power of the frequency-doubled laser; acquiring target output power and a set temperature value of the frequency doubling laser; and if the target output power is within the jump range of the output power of the frequency doubling laser, entering automatic power control after delaying for a preset time length. According to the technical scheme provided by the embodiment of the invention, the problems that the optimal temperature of the frequency doubling crystal dynamically changes along with the power and the environment, so that the output power of the frequency doubling laser is unstable and fluctuates are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of frequency-doubling lasers, and in particular to a power stabilization method and an adjustment system for a frequency-doubling laser. Background Art

[0002] Existing frequency-doubled lasers typically achieve stable output power by regulating the pump power of the fundamental optical amplifier through closed-loop control. However, the optimal operating temperature of the frequency-doubled crystal is not fixed; it fluctuates as the output power increases and continues to drift due to the influence of ambient temperature.

[0003] To address this issue, existing technologies typically use manually adjusted thermoelectric coolers (TECs) to set the temperature of the frequency-doubling crystal at different output powers. However, manual TEC adjustment has significant drawbacks. The TEC's response is slow, and the optimal temperature points required for different power levels are numerous and complex, requiring extensive pre-set data and cumbersome operation. Furthermore, even when the preset temperature is reached, output power remains unstable due to environmental fluctuations and the crystal's thermal characteristics, thus failing to fundamentally resolve the fluctuation issue.

[0004] The existing APC and manual TEC solutions cannot effectively deal with the dynamic changes in the optimal temperature of the frequency-doubling crystal with power and environment, which leads to problems such as unstable output power or power fluctuations. Summary of the Invention

[0005] The embodiments of the present invention provide a power stabilization method and regulation system for a frequency-doubling laser, which solves the problem that the optimal temperature of the frequency-doubling crystal dynamically changes with power and environment, thereby causing the output power of the frequency-doubling laser to be unstable and fluctuate, thereby achieving stable output of the frequency-doubling light.

[0006] In a first aspect, embodiments of the present invention provide a method for stabilizing the power of a frequency-doubled laser, comprising: obtaining the actual output power of the frequency-doubled laser; obtaining a target output power and a set temperature value of the frequency-doubled laser; and, if the target output power is within a jump range of the output power of the frequency-doubled laser, entering automatic power control after a predetermined delay.

[0007] Optionally, if the target output power is within the jump range of the output power of the frequency-doubled laser, the system enters automatic power control after a predetermined delay, including:

[0008] If the target output power is within the jump range of the output power of the frequency-doubling laser, the time is delayed for a predetermined time, and within the period of the predetermined time, the control temperature of the frequency-doubling crystal in the frequency-doubling laser is controlled to be a set temperature value;

[0009] If the actual output power is greater than or equal to the target output power, it enters automatic power control.

[0010] Optionally, after controlling the temperature of the frequency-doubling crystal in the frequency-doubling laser to be a set temperature value, the method further includes:

[0011] If the actual output power is less than the target output power, adjust the set temperature value.

[0012] Optionally, before entering automatic power control, the following steps are also included:

[0013] Obtaining a DA value based on the target output power and the set temperature value, wherein the DA value is used to control the output power of the pump source in the frequency-doubled laser;

[0014] After entering automatic power control, it also includes:

[0015] If the DA value is greater than or equal to the maximum limit value, the adjustment direction of the control temperature of the frequency doubling crystal in the frequency doubling laser is adjusted according to the change trend of the actual output power.

[0016] Optionally, according to the variation trend of the actual output power, the adjustment direction of the control temperature of the frequency-doubling crystal in the frequency-doubling laser is adjusted, including:

[0017] If the actual output power continues to decrease, the adjustment direction will be changed to the opposite direction to the original direction.

[0018] Optionally, according to the variation trend of the actual output power, the adjustment direction of the control temperature of the frequency-doubling crystal in the frequency-doubling laser is adjusted, including:

[0019] If the actual output power does not decrease continuously, adjust the control temperature of the frequency doubling crystal in the adjustment direction.

[0020] Optionally, before entering automatic power control, the following steps are also included:

[0021] Obtaining a DA value based on the target output power and the set temperature value, wherein the DA value is used to control the output power of the pump source in the frequency-doubled laser;

[0022] After entering automatic power control, it also includes:

[0023] If the DA value is less than the maximum limit value, the adjustment direction of the control temperature of the frequency doubling crystal in the frequency doubling laser is adjusted according to the change trend of the DA value.

[0024] Optionally, according to the changing trend of the DA value, the adjustment direction of the control temperature of the frequency-doubling crystal in the frequency-doubling laser is adjusted, including:

[0025] If the DA value increases continuously, the adjustment direction will be changed to the opposite direction of the original one.

[0026] Optionally, according to the changing trend of the DA value, the adjustment direction of the control temperature of the frequency-doubling crystal in the frequency-doubling laser is adjusted, including:

[0027] If the DA value does not increase continuously, adjust the control temperature of the frequency doubling crystal in the adjustment direction.

[0028] In a second aspect, an embodiment of the present invention provides a frequency-doubled laser adjustment system, comprising at least one frequency-doubled laser and a processing device; the processing device is connected to the at least one frequency-doubled laser, and the processing device comprises:

[0029] one or more processors;

[0030] a memory for storing one or more programs;

[0031] When one or more programs are executed by one or more processors, the one or more processors implement any power stabilization method of the first aspect for each frequency-doubled laser.

[0032] The embodiment of the present invention discloses a power stabilization method and regulation system for a frequency-doubling laser. The method includes: obtaining the actual output power of the frequency-doubling laser to achieve accurate perception of the laser's operating status and provide a feedback signal for closed-loop control; obtaining the target output power and set temperature value of the frequency-doubling laser to clarify the system's control target and operating benchmark; if the target output power is within the jump range of the frequency-doubling laser's output power, after a predetermined delay, automatic power control is entered, effectively avoiding malfunctions caused by hardware response delays and short-term interference, and ensuring that the system smoothly starts power closed-loop regulation under stable working conditions. Ultimately, the problem that the optimal temperature of the frequency-doubling crystal changes dynamically with power and environment, which in turn causes unstable and fluctuating output power of the frequency-doubling laser, is solved, and stable output of frequency-doubling light is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 1 is a schematic structural diagram of a frequency-doubling laser adjustment system provided by an embodiment of the present invention;

[0034] Figure 2 This is a flow chart of a method for stabilizing power of a frequency-doubling laser provided by an embodiment of the present invention;

[0035] Figure 3 This is a flow chart of another method for stabilizing power of a frequency-doubled laser provided by an embodiment of the present invention;

[0036] Figure 4 This is a flow chart of another method for stabilizing power of a frequency-doubling laser provided by an embodiment of the present invention;

[0037] Figure 5 This is a flow chart of another method for stabilizing power of a frequency-doubling laser provided by an embodiment of the present invention;

[0038] Figure 6This is a flow chart of another method for stabilizing power of a frequency-doubling laser provided by an embodiment of the present invention;

[0039] Figure 7 This is a flow chart of another method for stabilizing power of a frequency-doubling laser provided by an embodiment of the present invention;

[0040] Figure 8 This is a power test diagram of a power stabilization method for a frequency-doubling laser provided by an embodiment of the present invention;

[0041] Figure 9 The present invention provides a schematic structural diagram of a processing device of a frequency-doubling laser adjustment system. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0043] Figure 1 FIG. 1 is a structural diagram of a frequency-doubling laser adjustment system provided by an embodiment of the present invention. Figure 1 As shown, the system includes at least one frequency-doubled laser 10 and a processing device 20 .

[0044] Specifically, the core components of the frequency-doubling laser 10 include: a pump source 11: which generates fundamental frequency light based on a driving voltage. A frequency-doubling crystal 12: which receives the fundamental frequency light generated by the pump source 11 and converts it into a frequency-doubling light output. A power stabilization method for the frequency-doubling laser is preset in the processing device 20. In addition, the frequency-doubling laser adjustment system also includes: a photodiode 13: which is used to monitor the output power of the frequency-doubling light and feed back a signal representing the power (such as a PIN signal value) to the processing device 20. A thermoelectric cooler 14: which acts on the frequency-doubling crystal 12 to adjust the operating temperature of the frequency-doubling crystal 12.

[0045] For example, if the pump power is low, an amplifier 15 can be added between the pump source 11 and the frequency-doubling crystal 12 to increase the pump power. The arrow in the figure indicates the direction of laser transmission. The pump source 11 generates fundamental frequency light, which is amplified by the amplifier 15 to generate high-power fundamental frequency light. Finally, the frequency-doubling crystal 12 converts this light into frequency-doubled light for output.

[0046] The above structure is an optional embodiment provided by the embodiment of the present invention, which is used to facilitate understanding of the power stabilization method of the frequency-doubling laser provided by the present invention. Those skilled in the art should understand that the present invention is not limited to this specific frequency-doubling laser structure.

[0047] Figure 2This is a flow chart of a power stabilization method for a frequency-doubling laser provided by an embodiment of the present invention. The above control method is applicable to Figure 1 The frequency-doubled laser adjustment system shown. Figure 2 , the stabilization method includes:

[0048] S110: Obtain the actual output power of the frequency-doubled laser.

[0049] Specifically, the PIN value of the current or voltage signal output by the photomultiplier tube anode is collected. This signal is proportional to the incident light power. A calibration curve between the PIN output signal and the light power is pre-established to obtain the actual output power.

[0050] S120: Obtain the target output power and set temperature value of the frequency-doubled laser.

[0051] Specifically, the target output power and set temperature value of the frequency-doubled laser are the core input parameters that determine the system control strategy. These parameters are comprehensively set by the staff based on the actual usage scenarios, such as processing accuracy requirements, ambient temperature and humidity, and device aging degree.

[0052] S130: If the target output power is within the jump range of the output power of the frequency-doubled laser, the system enters automatic power control after a predetermined delay.

[0053] Among them, automatic power control can be understood as a control mode that adjusts the working conditions of the frequency-doubled laser in real time to make the actual output power value tend to be stable; the predetermined delay time can be understood as a buffer time that the system actively waits after detecting that the target power falls into the jump range.

[0054] Specifically, the target output power includes a base value and a jump value: the base value is the default power setting for stable operation of the laser under normal operating conditions, corresponding to the optimal operating point for energy conversion in the long-term collaboration between the pump source and the frequency-doubling crystal; the jump value is the deviation allowed for power fluctuations, and the deviation range from the base value constitutes the jump range. For example, the jump range is ±10%-20% of the base value. When the target power falls within this range, the system will start for a predetermined period of time to buffer the hardware response delay of the pump source drive current adjustment and the TEC temperature control module, while filtering out the impact of non-steady-state signals such as startup transients and electromagnetic interference. After the delay ends, the system will enter automatic power control mode.

[0055] For example, assume that automatic power control is entered directly without a predetermined delay. Initially after power-up, the system detects that the output power of the frequency-doubled laser is low. At this point, the automatic power control algorithm continuously increases the output power. Unchecked, this could cause the output power to quickly reach its maximum allowable value. Subsequently, the system would determine that the power is too high and begin to significantly reduce the pump drive current. This repeated over- and under-regulation would cause the actual output power to oscillate wildly.

[0056] The embodiment of the present invention discloses a power stabilization method for a frequency-doubled laser. By obtaining the actual output power of the frequency-doubled laser, accurate perception of the laser's operating state is achieved, providing a feedback signal for closed-loop control. By obtaining the target output power and set temperature value of the frequency-doubled laser, the control target and working benchmark of the system are clarified. If the target output power is within the jump range of the output power of the frequency-doubled laser, automatic power control is entered after a predetermined delay, effectively avoiding malfunctions caused by hardware response delays and short-term interference, and ensuring that the system smoothly starts power closed-loop control under stable working conditions. Ultimately, the problem of the optimal temperature of the frequency-doubled crystal changing dynamically with power and environment, which in turn causes unstable and fluctuating output power of the frequency-doubled laser, is solved, and stable output of the frequency-doubled light is achieved.

[0057] Figure 3 This is a flow chart of another method for stabilizing the power of a frequency-doubling laser provided by an embodiment of the present invention. The above control method is applicable to Figure 1 The frequency-doubled laser adjustment system shown. Figure 3 The embodiment of the present invention is an optimization of the above embodiment. Specifically, in the above embodiment, "if the target output power is within the jump range of the output power of the frequency-doubled laser, after a predetermined delay, enter automatic power control." can be specifically refined as follows:

[0058] If the target output power is within the jump range of the output power of the frequency-doubling laser, the time is delayed for a predetermined time, and within the period of the predetermined time, the control temperature of the frequency-doubling crystal in the frequency-doubling laser is controlled to be a set temperature value;

[0059] If the actual output power is greater than or equal to the target output power, it enters automatic power control.

[0060] For details not yet provided in this embodiment, please refer to the previous embodiment.

[0061] like Figure 3 As shown, another method for stabilizing the power of a frequency-doubled laser may include the following specific steps:

[0062] S210: Obtain the actual output power of the frequency-doubled laser.

[0063] S220: Obtain the target output power and set temperature value of the frequency-doubled laser.

[0064] S230: If the target output power is within the jump range of the output power of the frequency-doubling laser, delay for a predetermined time period, and control the temperature of the frequency-doubling crystal in the frequency-doubling laser to a set temperature value within the predetermined time period.

[0065] The set temperature value may be understood as an optimal operating temperature calculated or preset at the current target output power.

[0066] Specifically, when the system determines that the target output power is within the preset jump range of the frequency-doubling laser, the system will not immediately enter the automatic power control mode, but will enter the automatic power control mode after a pre-set delay waiting period. During the above waiting time, the system controls the operating temperature of the frequency-doubling crystal inside the frequency-doubling laser to reach or maintain it at the set temperature value. The predetermined delay time reserves initial adjustment time. Before starting the power closed-loop control, the frequency-doubling crystal is first preheated or stabilized at the temperature point with the highest theoretical efficiency, providing a good and stable foundation for subsequent power control.

[0067] S240: If the actual output power is greater than or equal to the target output power, enter automatic power control.

[0068] Specifically, after the delay expires, meaning the frequency-doubling crystal's controlled temperature has stabilized at the set value, if the actual output power is greater than or equal to the target output power, the system enters automatic power control mode. In automatic power control mode, the pump output is adjusted to adjust stability based on the difference between the actual output power and the set power value. During this adjustment process, a value is preset within a reasonable range. If it falls within this range, the frequency-doubling crystal is considered to be near its optimal temperature. If it falls outside this range, it is considered to be outside of the optimal temperature, and the pump light output needs to be increased to achieve the set power value.

[0069] This embodiment of the present invention builds on the previous example by adding a temperature preconditioning mechanism within a predetermined delay time. By proactively stabilizing the frequency-doubling crystal temperature at a set value, temperature initialization is completed early, reducing the adjustment burden after automatic power control is activated and allowing the actual output power to approach the target value more quickly. This also avoids overcompensation of pump power due to suboptimal temperature, reduces output power oscillation, and improves system stability.

[0070] Figure 4 This is a flow chart of another method for stabilizing the power of a frequency-doubling laser provided by an embodiment of the present invention. The above control method is applicable to Figure 1 The frequency-doubling laser adjustment system is shown in FIG. Figure 4As shown, the embodiment of the present invention is an optimization of the above embodiment. Specifically, in the above embodiment, after "if the target output power is within the jump range of the output power of the frequency-doubling laser, delay for a predetermined time, and control the control temperature of the frequency-doubling crystal in the frequency-doubling laser to a set temperature value during the period of the predetermined time", it also includes:

[0071] If the actual output power is less than the target output power, adjust the set temperature value.

[0072] For details not yet provided in this embodiment, please refer to the previous embodiment.

[0073] like Figure 4 As shown, another method for stabilizing the power of a frequency-doubled laser may include the following specific steps:

[0074] S310: Obtain the actual output power of the frequency-doubled laser.

[0075] S320: Obtain the target output power and set temperature value of the frequency-doubled laser.

[0076] S330: If the target output power is within the jump range of the output power of the frequency-doubling laser, delay for a predetermined time period, and control the temperature of the frequency-doubling crystal in the frequency-doubling laser to a set temperature value within the predetermined time period.

[0077] S340: If the actual output power is less than the target output power, adjust the set temperature value.

[0078] Specifically, if the current operating temperature of the frequency-doubling crystal deviates from the actual optimal temperature, even increasing the pump power will limit or even negate the increase in the output power of the frequency-doubling light. Therefore, adjusting the set temperature value essentially corrects or re-optimizes the theoretical optimal operating temperature of the frequency-doubling crystal. By adjusting the set temperature value, we can reposition or approach the actual optimal temperature that maximizes the frequency-doubling conversion efficiency at the current target power, thereby increasing the actual output power.

[0079] S350: If the actual output power is greater than or equal to the target output power, enter automatic power control.

[0080] This embodiment of the present invention complements the above-mentioned embodiment by introducing a mechanism for correcting the set temperature value when the actual power is still less than the target power after a predetermined delay. By re-optimizing the optimal operating temperature of the frequency-doubling crystal, frequency-doubling conversion efficiency is further improved, addressing power shortages caused by deviations between the theoretical and actual optimal temperatures, and avoiding DA value overloads caused by relying solely on pump power compensation, achieving more precise power stability control.

[0081] Figure 5This is a flow chart of another method for stabilizing the power of a frequency-doubling laser provided by an embodiment of the present invention. The above control method is applicable to Figure 1 The frequency-doubling laser adjustment system is shown in FIG. Figure 5 As shown, the embodiment of the present invention is an optimization of the above embodiment. Specifically, in the above embodiment, before "if the target output power is within the jump range of the output power of the frequency-doubled laser, after a predetermined delay, enter automatic power control.", it also includes:

[0082] Obtaining a DA value based on the target output power and the set temperature value, wherein the DA value is used to control the output power of the pump source in the frequency-doubled laser;

[0083] After "If the target output power is within the jump range of the output power of the frequency-doubled laser, after a predetermined delay, enter automatic power control.", it also includes:

[0084] If the DA value is greater than or equal to the maximum limit value, the adjustment direction of the control temperature of the frequency doubling crystal in the frequency doubling laser is adjusted according to the change trend of the actual output power.

[0085] For details not yet provided in this embodiment, please refer to the previous embodiment.

[0086] like Figure 5 As shown, another method for stabilizing the power of a frequency-doubled laser may include the following specific steps:

[0087] S410: Obtain the actual output power of the frequency-doubled laser.

[0088] S420: Obtain the target output power and set temperature value of the frequency-doubled laser.

[0089] S430: Obtain a DA value according to the target output power and the set temperature value.

[0090] The DA value is used to control the output power of the pump source in the frequency-doubled laser.

[0091] Specifically, based on the target output power and the set temperature, the target pump drive current required to bring the actual power close to the target is calculated and converted into a corresponding DA value. The DA value reflects the drive current of the pump source, which in turn reflects the pump output power.

[0092] S440: If the target output power is within the jump range of the output power of the frequency-doubled laser, the automatic power control is entered after a predetermined delay.

[0093] S450: If the DA value is greater than or equal to the maximum limit value, adjust the control temperature direction of the frequency doubling crystal in the frequency doubling laser according to the variation trend of the actual output power.

[0094] Specifically, when the DA value reaches or exceeds its preset maximum limit, it indicates that the pump source's drive current has reached its upper limit. If this limit is reached, the current temperature is no longer optimal for the frequency-doubling crystal. At this point, the system dynamically adjusts the frequency-doubling crystal's temperature control direction based on the actual output power trends monitored in real time. This proactive search and approach of the optimal operating temperature point that achieves higher conversion efficiency at the current target output power reduces reliance on pump current and allows the system to escape DA saturation.

[0095] Based on the above embodiments, the embodiments of the present invention add a DA value pre-calculation mechanism based on target power and temperature, and introduce temperature optimization logic when the DA value reaches the upper limit, so that the temperature of the frequency-doubling crystal is adapted to the input power, creating conditions for reducing the DA value, while increasing the output power and maintaining power stability.

[0096] In an optional embodiment, adjusting the control temperature direction of the frequency-doubling crystal in the frequency-doubling laser according to the variation trend of the actual output power includes:

[0097] If the actual output power continues to decrease, the adjustment direction will be changed to the opposite direction to the original direction.

[0098] Specifically, during the adjustment process, the DA value is checked to see if it has reached its upper limit. If so, this indicates that the current temperature is not the optimal temperature for the frequency-doubling crystal. The system will then dynamically adjust the temperature control direction of the frequency-doubling crystal based on the actual output power trend monitored in real time. If the actual output power continues to decrease, the current temperature is determined to have deviated from the optimal phase matching point, and the temperature adjustment direction will be reversed immediately.

[0099] For example, during the adjustment process, the DA value is checked to see if it has reached its upper limit. If so, this indicates that the current temperature point is not the optimal temperature point for the frequency doubling crystal. At this point, the system dynamically adjusts the temperature control direction of the frequency doubling crystal based on the actual output power trend monitored in real time. For example, the temperature may be increased by 0.4°C, and then the output power at this point may be determined. If the output power value continues to decrease, the set temperature direction is determined to be deviating from the optimal temperature point, and the temperature direction is adjusted accordingly.

[0100] In an optional embodiment, adjusting the control temperature direction of the frequency-doubling crystal in the frequency-doubling laser according to the variation trend of the actual output power includes:

[0101] If the actual output power does not decrease continuously, adjust the control temperature of the frequency doubling crystal in the adjustment direction.

[0102] Specifically, after temperature adjustment is performed, if the continuously sampled power does not continuously decrease, it indicates that the current temperature adjustment direction is correct. At this time, the system maintains the original direction and continues to fine-tune, eventually making the frequency doubling crystal temperature reach the optimal temperature point.

[0103] For example, during the adjustment process, it will be determined whether the DA value has reached the upper limit. If it has reached the upper limit, it means that the temperature point at this time is not the optimal temperature point of the frequency doubling crystal. At this time, the system will dynamically adjust the temperature control direction of the frequency doubling crystal based on the actual output power change trend monitored in real time. For example, first increase it by 0.4°C, and then determine the output power at this time. If there is no continuous power drop, the temperature setting direction at this time is approaching the optimal temperature point. At this time, continue to set the temperature in this direction until the temperature near the optimal temperature point is reached. The output power will become close to the set power, and the DA will slowly decrease, leaving the state where the DA value reaches the upper limit.

[0104] Figure 6 This is a flow chart of another method for stabilizing the power of a frequency-doubling laser provided by an embodiment of the present invention. The above control method is applicable to Figure 1 The frequency-doubling laser adjustment system is shown in FIG. Figure 6 As shown, the embodiment of the present invention is an optimization of the above embodiment. Specifically, in the above embodiment, before "if the target output power is within the jump range of the output power of the frequency-doubled laser, after a predetermined delay, enter automatic power control.", it also includes:

[0105] Obtaining a DA value based on the target output power and the set temperature value, wherein the DA value is used to control the output power of the pump source in the frequency-doubled laser;

[0106] After "If the target output power is within the jump range of the output power of the frequency-doubled laser, after a predetermined delay, enter automatic power control.", it also includes:

[0107] If the DA value is less than the maximum limit value, the adjustment direction of the control temperature of the frequency doubling crystal in the frequency doubling laser is adjusted according to the change trend of the DA value.

[0108] For details not yet provided in this embodiment, please refer to the previous embodiment.

[0109] like Figure 6 As shown, another method for stabilizing the power of a frequency-doubled laser may include the following specific steps:

[0110] S510: Obtain the actual output power of the frequency-doubled laser.

[0111] S520: Obtain the target output power and set temperature value of the frequency-doubled laser.

[0112] S530: Obtain a DA value according to the target output power and the set temperature value.

[0113] The DA value is used to control the output power of the pump source in the frequency-doubled laser.

[0114] Specifically, based on the target output power and the set temperature, the target pump drive current required to bring the actual power close to the target is calculated and converted into a corresponding DA value. The DA value reflects the drive current of the pump source, which in turn reflects the pump output power.

[0115] S540: If the target output power is within the jump range of the output power of the frequency-doubled laser, the automatic power control is entered after a predetermined delay.

[0116] S550: If the DA value is less than the maximum limit value, adjust the control temperature direction of the frequency doubling crystal in the frequency doubling laser according to the change trend of the DA value.

[0117] Specifically, during the DA value adjustment process, a DA value within a reasonable range is preset. If the DA value is within this range, it can be considered that the frequency-doubling crystal is near the optimal temperature point. If the DA value exceeds this range, it can be considered that the frequency-doubling crystal is not near the optimal temperature point, so it is necessary to increase the fundamental frequency pump light to reach the set power value. At this time, the temperature adjustment process will be entered again. Unlike before, the actual output power cannot be determined at this time because the power is still in the adjustment process and the output power value is still within a reasonable range. Therefore, by judging the changing trend of the DA value, the adjustment direction of the control temperature of the frequency-doubling crystal in the frequency-doubling laser is adjusted. When the pump source has not yet reached the power upper limit, the energy conversion efficiency is improved by optimizing the frequency-doubling crystal temperature, thereby delaying or preventing the DA value from reaching the upper limit.

[0118] Based on the above embodiments, the embodiments of the present invention add a temperature dynamic adjustment mechanism based on the DA value change trend when the maximum limit of the DA value is not reached. When the DA value does not reach the upper limit, the frequency doubling efficiency change is predicted by monitoring the growth trend of the DA value, and the crystal temperature is actively adjusted to optimize the energy conversion efficiency. When the DA value still has adjustment margin, temperature optimization is intervened in advance to delay the time it reaches the upper limit, extend the high-efficiency working cycle of the pump source, avoid long-term high-load operation of the pump source, and improve the life of the device.

[0119] In an optional embodiment, adjusting the control temperature direction of the frequency doubling crystal in the frequency doubling laser according to the change trend of the DA value includes:

[0120] If the DA value increases continuously, the adjustment direction will be changed to the opposite direction of the original one.

[0121] Specifically, during the adjustment process, the DA value is determined to have reached its upper limit. If it has not, the energy conversion efficiency is improved by optimizing the frequency-doubling crystal temperature, thereby delaying or preventing the DA value from reaching its upper limit. At this time, the system will dynamically adjust the temperature control direction of the frequency-doubling crystal based on the real-time monitoring of the DA value change trend. If the DA value continues to increase, it is determined that the current temperature is deviating from the optimal point, and reverse adjustment is more likely to approach the peak efficiency point.

[0122] For example, during the adjustment process, it will be determined whether the DA value has reached the upper limit. If it has not reached the upper limit, the energy conversion efficiency will be improved by optimizing the frequency doubling crystal temperature, thereby delaying or preventing the DA value from reaching the upper limit. At this time, the system will dynamically adjust the temperature control direction of the frequency doubling crystal based on the actual output power change trend monitored in real time. For example, it will first increase by 0.4°C and then determine the output power at this time. If the DA value continues to increase, it will be determined that the set temperature direction is deviating from the optimal temperature point, and the temperature direction will be reversed.

[0123] In an optional embodiment, adjusting the control temperature direction of the frequency doubling crystal in the frequency doubling laser according to the change trend of the DA value includes:

[0124] If the DA value does not increase continuously, adjust the control temperature of the frequency doubling crystal in the adjustment direction.

[0125] Specifically, during the adjustment process, the system determines whether the DA value has reached its upper limit. If not, it optimizes the frequency-doubling crystal temperature to improve energy conversion efficiency, thereby delaying or preventing the DA value from reaching its upper limit. At this point, the system dynamically adjusts the temperature control direction of the frequency-doubling crystal based on the real-time monitored DA value trend. If the DA value does not continuously increase, it is determined that the current temperature adjustment direction is effective and the frequency-doubling efficiency is improving or maintaining stability.

[0126] For example, during the adjustment process, it will be determined whether the DA value has reached the upper limit. If it has not reached the upper limit, the energy conversion efficiency will be improved by optimizing the frequency doubling crystal temperature, thereby delaying or preventing the DA value from reaching the upper limit. At this time, the system will dynamically adjust the temperature control direction of the frequency doubling crystal based on the actual output power change trend monitored in real time. For example, first increase it by 0.4°C, and then determine the output power at this time. If the DA value does not increase continuously, it is determined that the temperature adjustment direction set at this time is valid, and the frequency doubling efficiency is improving or maintaining stability.

[0127] Figure 7 This is a flow chart of another method for stabilizing the power of a frequency-doubling laser provided by an embodiment of the present invention. Figure 8 This is a power test diagram of a power stabilization method for a frequency-doubled laser provided by an embodiment of the present invention. Figure 7The technical solution of the embodiment of the present invention is optimized based on the above solution. The control method includes the following specific steps:

[0128] S610, PD real-time collection starts APC.

[0129] Among them, APC can be understood as automatic power control.

[0130] After this step is completed, step S620 is executed.

[0131] S620: Set the initial temperature value and output power.

[0132] After this step is completed, step S630 is executed.

[0133] S630: Determine whether it is within the power jump range.

[0134] If yes, execute step S640; if no, the process ends.

[0135] S640, delay 10S, enter APC adjustment mode.

[0136] After this step is completed, step S650 is executed.

[0137] S650: Determine whether the DA value reaches the maximum limit.

[0138] The DA value is used to control the output power of the pump source in the frequency-doubled laser.

[0139] If so, execute step S661; if not, execute step S671.

[0140] S661. Select the current temperature direction to set the temperature.

[0141] After this step is completed, execute step S662.

[0142] S662: Determine whether the three averages of the output power are decreasing.

[0143] If so, execute step S663; if not, execute step S664.

[0144] S663. Modify the temperature direction.

[0145] After this step is completed, execute step S664.

[0146] S664. Set the current direction to the temperature direction.

[0147] S671. Determine whether the DA value is within a reasonable fluctuation range.

[0148] If so, go to step S680; if not, go to step S672.

[0149] S680, APC fine-tune power within the fluctuation range.

[0150] After this step is completed, the process ends.

[0151] S672. Select the current temperature direction to set the temperature.

[0152] After this step is completed, execute step S673.

[0153] S673. Determine whether the three averages of the output power are increasing.

[0154] If so, execute step S674; if not, execute step S675.

[0155] S674. Modify the temperature direction.

[0156] After this step is completed, execute step S675.

[0157] S675. Set the current direction to the temperature direction.

[0158] like Figure 8 As shown, the horizontal axis is time in hours, and the vertical axis is output power. Based on the above method, the embodiment of the present invention tested the power output of a 10W frequency-doubled laser over a one-hour period. Within that hour, its maximum output power was 10.20W, its minimum output power was 10.09W, and its average output power was 10.14W. The stability of the 10W frequency-doubled laser reached 1% within that hour.

[0159] Figure 9 This is a structural diagram of a processing device of a frequency-doubling laser adjustment system provided by an embodiment of the present invention. Figure 1 A frequency-doubling laser adjustment system provided by an embodiment of the present invention includes at least one frequency-doubling laser 10 and a processing device 20; the processing device 20 is connected to the at least one frequency-doubling laser 10, and the processing device 20 includes: one or more processors; a memory for storing one or more programs; when the one or more programs are executed by one or more processors, the one or more processors can implement the power stabilization method provided by the embodiment of the present invention for each frequency-doubling laser.

[0160] The processing device 20 is signal-connected to the frequency-doubled laser 10 and coordinates the frequency-doubled laser 10 by executing a preset power stabilization method. The processing device 20 obtains the operating parameters of the frequency-doubled laser 10 (such as actual output power, pump drive current, operating temperature, etc.) and adjusts its control parameters accordingly to ensure that the frequency-doubled laser 10 can stably output the target power and operate at the optimal temperature point.

[0161] refer to Figure 9, the processing device 20 includes a processor and a memory. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the invention described and / or claimed herein.

[0162] like Figure 9 As shown, the processing device 20 includes at least one processor 21 and a memory, such as a read-only memory (ROM) 21 and a random access memory (RAM) 23, communicatively connected to the at least one processor 21. The memory stores a computer program executable by the at least one processor, and the processor 21 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 21 or loaded from the storage unit 28 into the random access memory (RAM) 23. The RAM 23 can also store various programs and data required for the operation of the processing device 20. The processor 21, ROM 21, and RAM 23 are interconnected via a bus 24. An input / output (I / O) interface 25 is also connected to the bus 24.

[0163] Various components in the processing device 20 are connected to an I / O interface 25, including an input unit 26, such as a keyboard, a mouse, etc.; an output unit 27, such as various types of displays, speakers, etc.; a storage unit 28, such as a magnetic disk, an optical disk, etc.; and a communication unit 29, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 29 allows the processing device 20 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0164] The processor 21 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of the processor 21 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any other suitable processor, controller, microcontroller, etc. The processor 21 can execute the power stabilization method for a frequency-doubled laser described in the above-described embodiments of the invention.

[0165] In some embodiments, the power stabilization method for a frequency-doubled laser can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 28. In some embodiments, part or all of the computer program can be loaded and / or installed on the processing device 20 via the ROM 21 and / or the communication unit 29. When the computer program is loaded into the RAM 23 and executed by the processor 21, one or more steps of the power stabilization method for a frequency-doubled laser can be performed. Alternatively, in other embodiments, the processor 21 can be configured to execute the power stabilization method for a frequency-doubled laser by any other appropriate means (e.g., by means of firmware).

[0166] Various embodiments of the systems and techniques described herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0167] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0168] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0169] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0170] A computing system may include clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0171] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will appreciate that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations, and substitutions are possible for those skilled in the art without departing from the scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for stabilizing the power of a frequency-doubled laser, characterized in that: include: Obtaining the actual output power of the frequency-doubled laser; Obtaining a target output power and a set temperature value of the frequency-doubled laser; If the target output power is within the jump range of the output power of the frequency-doubled laser, the automatic power control is entered after a predetermined delay.

2. The power stabilization method according to claim 1, characterized in that: If the target output power is within the jump range of the output power of the frequency-doubled laser, the automatic power control is entered after a predetermined delay, including: If the target output power is within the jump range of the output power of the frequency-doubling laser, delay for a predetermined time, and control the control temperature of the frequency-doubling crystal in the frequency-doubling laser to the set temperature value within the time period of the predetermined time; If the actual output power is greater than or equal to the target output power, the system enters automatic power control.

3. The power stabilization method according to claim 2, characterized in that: After controlling the temperature of the frequency doubling crystal in the frequency doubling laser to be the set temperature value, the method further includes: If the actual output power is less than the target output power, the set temperature value is adjusted.

4. The power stabilization method according to claim 1, wherein: Before entering automatic power control, it also includes: Obtaining a DA value according to the target output power and the set temperature value, wherein the DA value is used to control the output power of the pump source in the frequency-doubled laser; After entering automatic power control, it also includes: If the DA value is greater than or equal to the maximum limit value, the adjustment direction of the control temperature of the frequency doubling crystal in the frequency doubling laser is adjusted according to the variation trend of the actual output power.

5. The power stabilization method according to claim 4, characterized in that: Adjusting the control temperature direction of the frequency doubling crystal in the frequency doubling laser according to the variation trend of the actual output power includes: If the actual output power decreases continuously, the adjustment direction is changed to the opposite direction to the original direction.

6. The power stabilization method according to claim 4, characterized in that: Adjusting the control temperature direction of the frequency doubling crystal in the frequency doubling laser according to the variation trend of the actual output power includes: If the actual output power does not decrease continuously, the control temperature of the frequency doubling crystal is adjusted in the adjustment direction.

7. The power stabilization method according to claim 1, characterized in that: Before entering automatic power control, it also includes: Obtaining a DA value according to the target output power and the set temperature value, wherein the DA value is used to control the output power of the pump source in the frequency-doubled laser; After entering automatic power control, it also includes: If the DA value is less than the maximum limit value, the adjustment direction of the control temperature of the frequency doubling crystal in the frequency doubling laser is adjusted according to the change trend of the DA value.

8. The power stabilization method according to claim 7, characterized in that: Adjusting the control temperature direction of the frequency doubling crystal in the frequency doubling laser according to the change trend of the DA value includes: If the DA value increases continuously, the adjustment direction is changed to the opposite direction to the original direction.

9. The power stabilization method according to claim 7, characterized in that: Adjusting the control temperature direction of the frequency doubling crystal in the frequency doubling laser according to the change trend of the DA value includes: If the DA value does not increase continuously, the control temperature of the frequency doubling crystal is adjusted in the adjustment direction.

10. A frequency-doubling laser adjustment system, characterized in that: including at least one frequency-doubled laser and processing equipment; The processing device is connected to the at least one frequency-doubled laser, and the processing device includes: one or more processors; a memory for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the power stabilization method according to any one of claims 1 to 9 for each frequency-doubled laser.

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