CN116111438A - Calibration method of ultraviolet laser and ultraviolet laser - Google Patents

Abstract

The embodiment of the application provides a calibration method of an ultraviolet laser and the ultraviolet laser, and relates to the technical field of lasers. According to the ultraviolet laser calibration method and the ultraviolet laser, the real-time power of the ultraviolet laser is obtained first, and then whether power calibration operation is needed to be executed on the ultraviolet laser is judged according to the real-time power. If the power calibration operation needs to be executed on the ultraviolet laser, determining a temperature adjustment scheme of a frequency multiplication component corresponding to the ultraviolet laser according to the real-time power and the factory power of the ultraviolet laser, and controlling the frequency multiplication component to execute the temperature adjustment scheme. Therefore, the real-time power of the ultraviolet laser can be automatically monitored to judge whether power attenuation occurs, and when the power attenuation occurs, the frequency doubling component is controlled to execute a temperature adjustment scheme to realize temperature compensation, so that the laser power is automatically recovered, and the laser power is automatically and accurately calibrated through simple operation.

Description

Calibration method of ultraviolet laser and ultraviolet laser

technical field

The present application relates to the technical field of lasers, in particular to a method for calibrating an ultraviolet laser and the ultraviolet laser.

Background technique

In the application field of laser technology, ultraviolet lasers are widely used in scientific research, industrial processing, medical treatment, etc., and the reliability and stability of the output of ultraviolet picosecond lasers are required to be high. Ultraviolet lasers generally include ultraviolet picosecond lasers and ultraviolet nanosecond lasers, and ultraviolet lasers usually have frequency doubling components and temperature control modules. In the use of ultraviolet lasers, output power attenuation often occurs, that is, the actual output power is lower than the factory calibration power, which affects the processing and use of the laser. The reason for the power attenuation is usually because the conversion efficiency of the frequency doubling crystal has changed, and the conversion efficiency of the frequency doubling crystal is closely related to its temperature.

The existing calibration method is to place a power meter at the output end of the laser and manually modify the temperature of the frequency doubling crystal through the laser man-machine interface or the host computer software and observe whether the power displayed on the power meter reaches the factory calibration power value to calibrate. The process of this method of operation is relatively cumbersome, and the accuracy of manual calibration is poor.

Contents of the invention

In order to solve the above technical problems, embodiments of the present application provide a method for calibrating an ultraviolet laser and an ultraviolet laser.

In the first aspect, an embodiment of the present application provides a method for calibrating an ultraviolet laser, which is applied to an ultraviolet laser, and the method includes:

Obtain the real-time power of the ultraviolet laser;

judging whether a power calibration operation needs to be performed on the ultraviolet laser according to the real-time power;

If it is determined that a power calibration operation needs to be performed on the ultraviolet laser, then determine a temperature adjustment scheme corresponding to the frequency doubling component of the ultraviolet laser according to the real-time power and the factory power of the ultraviolet laser;

The frequency doubling component is controlled to implement the temperature adjustment scheme.

According to a specific implementation manner of the present application, the step of obtaining the real-time power of the ultraviolet laser includes:

separating a test beam in the output laser light of the ultraviolet laser;

converting the test light beam into an electrical pulse signal through a photodetector, and converting the electrical pulse signal into a digital signal through an analog-to-digital converter;

The digital signal is received and the corresponding real-time power is calculated.

According to a specific implementation manner of the present application, before the step of converting the electrical pulse signal to obtain a digital signal through an analog-to-digital converter, the method further includes:

Filtering and noise reduction processing is performed on the electric pulse signal.

According to a specific implementation of the present application, the temperature adjustment scheme of the frequency doubling component corresponding to the ultraviolet laser is determined according to the real-time power and the factory power of the ultraviolet laser, and the frequency doubling component is controlled to implement the temperature adjustment scheme. Steps to adjust the plan, including:

calculating the compensation temperature according to the real-time power and the factory power;

Controlling the frequency doubling component to perform a temperature raising operation according to the compensation temperature, until a predetermined condition is reached and stop.

According to a specific implementation manner of the present application, the predetermined conditions include any of the following:

The real-time power of the ultraviolet laser reaches the factory power during the temperature raising operation;

The real-time temperature of the frequency doubling component reaches the compensation temperature;

The time to perform the temperature boost operation reaches the time threshold.

According to a specific implementation manner of the present application, the step of judging whether a power calibration operation needs to be performed on the ultraviolet laser according to the real-time power includes:

displaying the real-time power on an external display of the ultraviolet laser;

Monitor whether a click operation acting on a preset button is received;

If a click operation acting on the preset button is received, it is determined that a power calibration operation needs to be performed on the ultraviolet laser.

In the second aspect, the embodiment of the present application provides an ultraviolet laser, including a laser generator body, a frequency doubling component, a memory, and a processor, the memory stores a computer program, and the computer program is executed when the processor runs The calibration method of the ultraviolet laser described in any one of the first aspect.

According to a specific embodiment of the present application, the frequency doubling component includes a frequency doubling crystal, a thermistor, a structural member and a semiconductor cooling chip for heating, the structural member surrounds the frequency doubling crystal, and the semiconductor The refrigerating sheet and the thermistor are installed on the structural member.

According to a specific embodiment of the present application, the ultraviolet laser further includes a photodetector and an analog-to-digital converter, the photodetector is arranged at the output end of the laser generator body, and the output of the photodetector The terminal is connected to the analog-to-digital converter, and the analog-to-digital converter is connected to the processor.

According to a specific implementation manner of the present application, the ultraviolet laser further includes a human-computer interaction module.

In the above-mentioned calibration method of the ultraviolet laser and the ultraviolet laser provided in the present application, the real-time power of the ultraviolet laser is obtained first, and then it is judged according to the real-time power whether it is necessary to perform a power calibration operation on the ultraviolet laser. If it is determined that the power calibration operation needs to be performed on the ultraviolet laser, then determine the temperature adjustment scheme corresponding to the frequency doubling component of the ultraviolet laser according to the real-time power and the factory power of the ultraviolet laser, and control the frequency doubling component to perform The temperature adjustment scheme. In this way, the real-time power of the ultraviolet laser can be automatically monitored to determine whether there is power attenuation, and when the power attenuation occurs, the frequency doubling component is controlled to implement a temperature adjustment scheme to achieve temperature compensation and then the laser power is automatically restored, and the automatic laser power is realized through simple operation. , Calibrated accurately.

Description of drawings

In order to illustrate the technical solution of the present application more clearly, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded It is regarded as a limitation on the scope of protection of the present application. In the respective drawings, similar components are given similar reference numerals.

Fig. 1 shows a schematic flow chart of a method for calibrating an ultraviolet laser provided in an embodiment of the present application;

Fig. 2 shows a schematic structural diagram of an ultraviolet laser provided by an embodiment of the present application;

Fig. 3 shows the schematic circuit diagram of the photodetector of the ultraviolet laser that the embodiment of the present application provides;

FIG. 4 shows a schematic diagram of the composition of the frequency doubling component of the ultraviolet laser provided by the embodiment of the present application;

FIG. 5 shows a schematic circuit diagram of a TEC cooling chip of a frequency doubling component of an ultraviolet laser provided in an embodiment of the present application.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all of them.

The components of the embodiments of the application generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative efforts belong to the scope of protection of the present application.

Hereinafter, the terms "comprising", "having" and their cognates that may be used in various embodiments of the present application are only intended to represent specific features, numbers, steps, operations, elements, components or combinations of the foregoing, And it should not be understood as first excluding the existence of one or more other features, numbers, steps, operations, elements, components or combinations of the foregoing or adding one or more features, numbers, steps, operations, elements, components or a combination of the foregoing possibilities.

In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions, and should not be construed as indicating or implying relative importance.

Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which various embodiments of the application belong. The terms (such as those defined in commonly used dictionaries) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning, Unless clearly defined in the various embodiments of the present application.

Example 1

An embodiment of the present disclosure provides a method for calibrating an ultraviolet laser, which is applied to the ultraviolet laser 200 shown in FIG. 2 . As shown in Figure 1, the calibration method of described ultraviolet laser mainly comprises the following steps:

Step S101, obtaining the real-time power of the ultraviolet laser;

The ultraviolet laser 200 may include an ultraviolet nanolaser and an ultraviolet picosecond laser. The reason for its power attenuation is usually because the conversion efficiency of the frequency doubling crystal changes, and the conversion efficiency of the frequency doubling crystal is closely related to its temperature. The calibration method provided by this application, Power calibration is primarily performed through a temperature compensation scheme. In order to realize that the ultraviolet laser 200 can be automatically calibrated remotely during the user's use after leaving the factory, the calibration device relied on in this calibration scheme is the device contained in the ultraviolet laser 200 itself, that is, the calibration device is set in the ultraviolet laser 200 to achieve calibration.

Specifically, as shown in Figure 2, the ultraviolet laser 200 includes a laser generator 201, a processor 202 as a control unit, a frequency doubling component 203, a photodetector 204 and other execution units, and the processor 202 obtains the ultraviolet laser detected by the photodetection unit 200 real-time power, and then control the relevant execution units to perform calibration operations, so that there is no need for an external power meter to obtain the output power of the ultraviolet laser 200 and perform calibration operations.

According to a specific implementation manner of the present application, the step of obtaining the real-time power of the ultraviolet laser 200 includes:

separating a test beam from the output laser of the ultraviolet laser 200;

The test light beam is converted into an electrical pulse signal by a photodetector 204, and the electrical pulse signal is converted by an analog-to-digital converter 205 to obtain a digital signal;

The digital signal is received and the corresponding real-time power is calculated.

As shown in Figure 2, a photodetector 204 is arranged in the ultraviolet laser 200, and a beam is separated from the output laser of the laser generator 201, which is defined as a test beam, and the real-time power of the test beam is detected by the photodetector 204, as the real-time power of the ultraviolet laser 200 .

As shown in FIG. 3 , a simplified schematic diagram of the internal circuit of the photodetector 204 is a photosensor capable of converting optical signals into electrical signals. Connecting a negative voltage to the anode of the photodetector 204D1 makes D1 in a reverse bias state, which will accelerate the generation and movement of photogenerated carriers and increase the responsivity, which is suitable for high-speed applications. Since the photocurrent converted by the photodetector 204 is small, it is not convenient for post-stage processing, so the photocurrent is pre-amplified first, and the connection method between the photodetector 204 and the transimpedance amplifier circuit is adopted. When D1 receives the laser pulse injection, it will generate a synchronous current pulse signal, which will be output as a voltage pulse signal after the conversion circuit. The output of the conversion circuit is: Vs=Id1*Rf;

Wherein, Id1 is the magnitude of the current flowing through the photodetector 204 after the optical signal is converted into an electrical signal, Rf is the feedback resistor, and Vs is the output voltage of the photoelectric conversion circuit.

Using such an amplifying circuit can not only amplify the weak photocurrent signal in the first stage, but also convert the current signal into a voltage signal, which is convenient for the further processing of the signal by the subsequent stage circuit. Connecting capacitor C1 in parallel at both ends of Rf can limit the bandwidth of the signal, filter out the interference of high-frequency signals, and ensure the stability of signal transmission.

The photodetector 204 converts the test beam into an electrical pulse signal, and then converts the test beam into a digital signal through the analog-to-digital converter 205 in the ultraviolet laser 200 to obtain a digital signal, and then calculates the real-time power of the test signal.

On the basis of the above embodiments, according to a specific embodiment of the present application, before the step of converting the electrical pulse signal to a digital signal through the analog-to-digital converter 205, the method further includes:

Filtering and noise reduction processing is performed on the electric pulse signal.

In order to detect real-time power more accurately, a filter 206 can also be added in the ultraviolet laser 200, which is used to perform filtering and noise reduction processing on the detection signal before analog-to-digital conversion, and convert irregular electrical pulse signals into regular electrical pulses signal, improving detection accuracy and calibration sensitivity.

Step S102, judging whether it is necessary to perform a power calibration operation on the ultraviolet laser 200 according to the real-time power;

After obtaining the real-time power of the ultraviolet laser 200 according to the above steps, it can be judged according to the real-time power whether there is power attenuation relative to the factory power, so as to judge whether power calibration operation needs to be performed. The way to trigger the power calibration operation can be fully automatic or semi-automatic.

Among them, the fully automatic triggering method can be that the ultraviolet laser 200 can be equipped with an automatic monitoring program to monitor the real-time power of the ultraviolet laser 200 periodically or every time it is powered on, and according to the automatically monitored real-time power and factory power For comparison, if there is power attenuation, the power calibration operation will be automatically triggered.

The semi-automatic triggering method may be manually triggered by the user for the calibration operation. According to a specific implementation manner of the present application, the step of judging whether a power calibration operation needs to be performed on the ultraviolet laser 200 according to the real-time power may specifically include:

Display the real-time power on the external display of the ultraviolet laser 200;

Monitor whether a click operation acting on a preset button is received;

If a click operation acting on the preset button is received, it is determined that a power calibration operation needs to be performed on the ultraviolet laser 200 .

The ultraviolet laser 200 is connected with an external display and a human-computer interaction module 207. The external display may be a display of a terminal device held by the user and communicated with the ultraviolet laser 200, or may be a display equipped outside the ultraviolet laser 200. After the ultraviolet laser 200 detects the real-time power, the real-time power is displayed on the display for users to check. The user judges whether there is power attenuation by comparing the real-time power with the factory power. If there is power attenuation, the user performs a click operation on the preset button of the human-computer interaction module. The click operation is the one-key calibration operation of the ultraviolet laser 200 . If the ultraviolet laser 200 detects a click operation acting on the preset button, a power calibration operation is triggered.

It should be noted that the ultraviolet laser 200 automatically compares the real-time power with the factory power, or the user manually compares the real-time power with the factory power, and it is not limited that the real-time power and the factory power are exactly the same. That is, if the difference between the real-time power and the factory power is within a small difference range, the power calibration operation may not be triggered. You can set the power calibration operation to be triggered only when the difference is greater than the preset difference range, which can also avoid Unnecessary power consumption due to frequent power calibration. Of course, scenes with higher precision requirements can also set a smaller difference range or limit the real-time power to be exactly the same as the factory power.

Step S103, if it is determined that a power calibration operation needs to be performed on the ultraviolet laser 200, then determine a temperature adjustment scheme corresponding to the frequency doubling component 203 of the ultraviolet laser 200 according to the real-time power and the factory power of the ultraviolet laser 200;

The reason for the power attenuation is that the temperature reduction of the frequency doubling crystal leads to the deterioration of the conversion efficiency. Then, increasing the temperature of the frequency doubling component 203 can increase the power. The degree of power increase is related to the degree of temperature compensation. The difference of the factory power to determine a temperature adjustment scheme, which is implemented by the frequency doubling component 203 of the ultraviolet laser 200 .

Step S104, controlling the frequency doubling component 203 to execute the temperature adjustment scheme.

As shown in FIG. 4 , the frequency doubling component 203 is composed of a frequency doubling crystal, a TEC cooling chip, a thermistor and structural components. The frequency doubling crystal is usually in the shape of a cuboid, and the structural parts wrap and clamp the frequency doubling crystal to fix the frequency doubling crystal and absorb the heat generated when the laser passes through the frequency doubling crystal. TEC cooling chips are installed on the structure to heat or cool it to maintain it at a constant temperature point. The thermistor is also installed on the structural parts for real-time temperature feedback and forms a temperature closed-loop control with the TEC refrigeration sheet.

TEC is a device based on the Peltier effect. By changing the direction of the TEC working current, heating or cooling can be realized, and the cooling power can be adjusted by changing the current. The circuit usually uses an H-bridge drive circuit as shown in Figure 5. When the logic level of the control MOS transistors Q1 and Q4 is 1, and the logic level of the MOS transistors Q2 and Q3 is 0, a flow from VCC to Q1 to L1 will be generated in the circuit. Then to TEC, then to L2, finally to Q4, and then to ground; conversely, after the level logic is interchanged, a current will flow from VCC to Q3 to L2, then to TEC, then to L1, finally to Q2, and then to ground, which is Two-way control is realized. The inductance and capacitor are added to the circuit to play the role of filtering and make the circuit work more stable.

During specific implementation, the temperature adjustment scheme of the frequency doubling component 203 corresponding to the ultraviolet laser 200 is determined according to the real-time power and the factory power of the ultraviolet laser 200, and the frequency doubling component 203 is controlled to execute the temperature adjustment scheme steps, including:

calculating the compensation temperature according to the real-time power and the factory power;

The frequency multiplier component 203 is controlled to perform a temperature raising operation according to the compensation temperature until a predetermined condition is reached and then stops.

According to a specific implementation manner of the present application, the predetermined conditions include any of the following:

The real-time power of the ultraviolet laser 200 reaches the factory power during the temperature raising operation;

The real-time temperature of the frequency doubling component 203 reaches the compensation temperature;

The time to perform the temperature boost operation reaches the time threshold.

The frequency doubling crystal has a better working temperature range, and then adjust it within the better working temperature range when adjusting the temperature. According to the difference between the current power and the target power to set and adjust the size of the temperature scale, the temperature can be gradually increased from the lower limit of the working temperature range, and at the same time receive the current real-time power feedback of the laser to determine the appropriate temperature point. Considering that the operating temperature of the frequency doubling crystal is limited or the power attenuation may be caused by other reasons, three predetermined conditions for stopping can be set when performing power calibration through the temperature adjustment scheme, as follows:

In the first aspect, the current real-time power of the ultraviolet laser 200 is detected in real time, and when the real-time power reaches or basically reaches the factory power, the temperature increase is stopped and kept at the current temperature.

In the second aspect, stop when the real-time temperature reaches the compensation temperature corresponding to the power difference.

In the third aspect, stop when the temperature raising operation reaches the time threshold. The time threshold can be preset as 3 minutes to 5 minutes. Of course, it can also be customized according to the working parameters of the ultraviolet laser 200 , without limitation.

Predetermined conditions are set to control the execution degree of the temperature raising operation, so as to prevent the output power of the ultraviolet laser 200 from being adversely affected by the temperature raising degree being too high.

In the calibration method of the ultraviolet laser provided in this embodiment, a built-in photodetector is used to measure the power of the ultraviolet laser, and no external power meter is required to observe the output power of the laser. Through the one-key calibration power algorithm, there is no need to manually adjust the output power of the frequency-doubling temperature test laser repeatedly. When the power of the UV laser attenuates at the user end, the user can apply a one-key calibration power operation to make the output power of the laser reach the factory-set power, quickly solve the fault, and restore the application. Reduce the frequency of technicians going to the user's end to repair the laser. Of course, the calibration scheme of the ultraviolet laser provided in this embodiment can also be applied to the calibration of other lasers whose power is attenuated due to the influence of temperature, without limitation.

Example 2

Referring to Fig. 2, a kind of ultraviolet laser provided for the embodiment of the present application includes a laser generator body 201, a frequency doubling assembly 203, a memory (not shown in the figure) and a processor 202, the memory stores a computer program, so The computer program executes the method for calibrating an ultraviolet laser according to any one of the first aspect when the processor is running.

According to a specific embodiment of the present application, the frequency doubling component 203 includes a frequency doubling crystal, a thermistor, a structural member and a semiconductor cooling chip for heating, the structural member surrounds the frequency doubling crystal, and the The semiconductor cooling chip and the thermistor are installed on the structural member.

According to a specific embodiment of the present application, the ultraviolet laser further includes a photodetector 204 and an analog-to-digital converter 205, the photodetector is arranged at the output end of the laser generator body, and the photodetector The output terminal of is connected with the analog-to-digital converter, and the analog-to-digital converter is connected with the processor.

According to a specific implementation manner of the present application, the ultraviolet laser further includes a filter 206 disposed between the output end of the photodetector 204 and the analog-to-digital converter 205 .

According to a specific implementation manner of the present application, the ultraviolet laser further includes a human-computer interaction module 207 .

For the above-mentioned ultraviolet laser provided in the present application, the real-time power of the ultraviolet laser is obtained first, and then it is judged according to the real-time power whether to perform a power calibration operation on the ultraviolet laser. If it is determined that the power calibration operation needs to be performed on the ultraviolet laser, then determine the temperature adjustment scheme corresponding to the frequency doubling component of the ultraviolet laser according to the real-time power and the factory power of the ultraviolet laser, and control the frequency doubling component to perform The temperature adjustment scheme. In this way, the real-time power of the ultraviolet laser can be automatically monitored to determine whether there is power attenuation, and when the power attenuation occurs, the frequency doubling component is controlled to implement a temperature adjustment scheme to achieve temperature compensation and then the laser power is automatically restored, and the automatic laser power is realized through simple operation. , Calibrated accurately. When the power of the UV laser attenuates at the user end, the user can apply a one-key calibration power operation to make the output power of the laser reach the factory-set power, quickly solve the fault, and restore the application. Reduce the frequency of technicians going to the user's end to repair the laser. Certainly, the calibration scheme of the ultraviolet laser provided in this embodiment may also be applicable to the calibration of other lasers whose power is attenuated due to the influence of temperature, without limitation. For the specific implementation process of the provided ultraviolet laser, reference may be made to the specific implementation process of the calibration method for the ultraviolet laser provided in the above-mentioned embodiments, which will not be repeated here.

It should be noted that, in this document, the term "comprising", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article or terminal comprising a set of elements includes not only those elements, It also includes other elements not expressly listed, or elements inherent in the process, method, article, or terminal. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article or terminal comprising the element.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general-purpose hardware platform, and of course also by hardware, but in many cases the former is better implementation. Based on such an understanding, the technical solution of the present application can be embodied in the form of a software product in essence or the part that contributes to the prior art, and the computer software product is stored in a storage medium (such as ROM/RAM, disk, CD) contains several instructions to enable a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in various embodiments of the present application.

The embodiments of the present application have been described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementations. The above-mentioned specific implementations are only illustrative and not restrictive. Those of ordinary skill in the art will Under the inspiration of this application, without departing from the purpose of this application and the scope of protection of the claims, many forms can also be made, all of which belong to the protection of this application.

Claims (10)

1. A method of calibrating an ultraviolet laser, for application to an ultraviolet laser, the method comprising:

acquiring the real-time power of the ultraviolet laser;

judging whether power calibration operation is required to be executed on the ultraviolet laser according to the real-time power;

if the power calibration operation needs to be executed on the ultraviolet laser, determining a temperature adjustment scheme of a frequency multiplication component corresponding to the ultraviolet laser according to the real-time power and the factory power of the ultraviolet laser;

and controlling the frequency doubling component to execute the temperature adjustment scheme.

2. The method of claim 1, wherein the step of obtaining real-time power of the ultraviolet laser comprises:

separating a test beam from the output laser of the ultraviolet laser;

converting the test light beam into an electric pulse signal through a photoelectric detector, and converting the electric pulse signal into a digital signal through an analog-to-digital converter;

and receiving the digital signal and calculating the corresponding real-time power.

3. The method of claim 2, wherein prior to the step of converting the electrical pulse signal to a digital signal by an analog-to-digital converter, the method further comprises:

and filtering and denoising the electric pulse signal.

4. The method of claim 1, wherein the step of determining a temperature adjustment scheme for a frequency doubling component of the ultraviolet laser based on the real-time power and the factory power of the ultraviolet laser, and controlling the frequency doubling component to execute the temperature adjustment scheme comprises:

calculating a compensation temperature according to the real-time power and the factory power;

and controlling the frequency doubling component to execute temperature lifting operation according to the compensation temperature until a preset condition is reached.

5. The method of claim 4, wherein the predetermined condition comprises any one of:

the real-time power of the ultraviolet laser reaches the factory power in the process of executing the temperature raising operation;

the real-time temperature of the frequency doubling component reaches the compensation temperature;

the duration of performing the temperature ramp-up operation reaches a duration threshold.

6. The method according to any one of claims 1 to 5, wherein the step of determining whether power calibration operation of the ultraviolet laser is required based on the real-time power comprises:

displaying the real-time power on an external display of the ultraviolet laser;

monitoring whether a clicking operation acting on a preset button is received or not;

and if the clicking operation acted on the preset button is received, judging that the power calibration operation needs to be executed on the ultraviolet laser.

7. An ultraviolet laser comprising a laser generator body, a frequency doubling component, a memory and a processor, the memory storing a computer program which, when run by the processor, performs the method of calibrating an ultraviolet laser according to any of claims 1 to 6.

8. The ultraviolet laser of claim 7, wherein the frequency doubling assembly comprises a frequency doubling crystal, a thermistor, a structural member and a semiconductor cooling sheet for heating, the structural member being disposed around the frequency doubling crystal, the semiconductor cooling sheet and the thermistor being mounted on the structural member.

9. The ultraviolet laser of claim 7, further comprising a photodetector and an analog-to-digital converter, wherein the photodetector is disposed at the output of the laser generator body, and wherein the output of the photodetector is coupled to the analog-to-digital converter, and wherein the analog-to-digital converter is coupled to the processor.

10. The ultraviolet laser of claim 7, further comprising a man-machine interaction module.

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