Laser pulse sequence adjustable control device and laser pulse sequence optimization method

Abstract

The present invention belongs to the field of laser technology and provides a control device with adjustable laser pulse sequence and a laser pulse sequence optimization method. The control device with adjustable laser pulse sequence comprises: a pulse laser source for emitting an initial optical pulse sequence; an optical amplification module connected to the pulse laser source; a control module respectively connected to the pulse laser source and the optical amplification module; and an operation module connected to the control module for generating an optical pulse compensation electrical signal. Compared with the prior art, the present invention effectively avoids the "light leakage" phenomenon by independently loading the optical pulse compensation electrical signal on the optical amplification module, effectively controls the intensity of the initial sequence in the output optical pulse sequence, and optimizes the amplitude distribution of the output optical pulse sequence.

Description

Technical Field

[0001] The present invention relates to the field of laser technology, and in particular to a control device with adjustable laser pulse sequence and a laser pulse sequence optimization method. Background Art

[0002] Fiber lasers offer advantages such as high electro-optical conversion efficiency, excellent heat dissipation, superior beam quality, and high pulse energy and peak power. They are widely used in laser processing applications such as laser cutting and laser marking. However, new applications are placing higher demands on laser performance. One key performance concern is the amplitude distribution of the laser's output pulse train over time after it is turned on. This performance impacts the processing performance of applications where frequency or power conversion is required while maintaining the laser's output.

[0003] In practice, it is necessary to obtain a laser with a higher average power output to meet the needs of practical applications. High-power fiber lasers are generally implemented based on master oscillator power amplifier (MOPA) technology, that is, a pulsed laser source (or seed source) emits a low-power laser signal, which is amplified by one or more power amplifier stages (optical amplifier modules) to achieve the power amplification of the injected laser signal, thereby obtaining a high-power laser output consistent with the characteristics of the seed source, such as Figure 1 As shown. For a pulsed fiber laser, when the laser is turned on, the laser pulse sequence output by the seed source will pass through the subsequent cascade amplifier stages in sequence, where the pump source generates a pump laser after loading an electrical signal, and the gain fiber absorbs the pump laser to achieve a population inversion and thereby amplify the power of the injected laser pulse. Generally speaking, the electrical signal loaded by the pump source corresponding to the previous amplifier stage will be ahead of or equal to the electrical signal of the next amplifier stage, to avoid spontaneous radiation amplification and damage to the laser system due to the lack of laser pulse injection into the amplifier stage. In a fiber laser system, the light pulses in the initial few cycles (initial sequence) will not obtain sufficient gain (power amplification factor) due to insufficient stored pump power. As shown Figure 2 As shown in the figure, as the main amplifier stage pump source current is turned on (with a certain rise time), the intensity (amplitude) of the initial optical pulses in the optical pulse sequence gradually increases with the increase in absorption pumping. It takes a certain amount of time to achieve a stable amplitude optical pulse output. In addition, when the electrical signal intensity is high, some overshoot or dropout may occur in the electrical signal itself, further affecting the amplitude difference of the initial optical pulses in the optical pulse sequence after amplification.

[0004] In practical applications, the amplitude of the initial sequence of optical pulses is relatively small, so the processing effect of the first few pulses is poor due to insufficient amplitude. In the fiber laser system, in order to increase the amplitude of the initial sequence of optical pulses, the existing technical solution is to load a conventional continuous and small amplitude pre-current signal on the main amplifier. Figure 3 As shown, the pre-current signal is turned on ahead of the main current signal loaded on the same pump source by a time period of T2-T1, so the gain fiber can absorb and store a certain amount of pump power in advance. To a certain extent, this method can effectively perform power compensation amplification on the initial sequence of the optical pulse sequence. However, this method also has the following defects: First, the pump power stored in the pre-current signal is mainly consumed by the first pulse at the beginning, that is, the gain obtained by the first pulse signal is the largest, while the gain obtained by the subsequent pulses starting from the second pulse is smaller; Second, in order to obtain the subsequent pulses starting from the second pulse with a comparable amplitude to the subsequent stable pulse sequence, this can only be achieved by extending the duration of the pre-current signal or increasing its intensity, that is, storing enough pump power. But at this time, the first pulse will further obtain a larger amplitude output, such as Figure 4 As shown, by increasing the intensity of the pre-current signal, its high peak power poses a risk of damaging optical fibers and optical fiber components. In common fiber laser systems, the main amplifier is loaded with a relatively high pump power to achieve high-power output. In existing technologies, the pre-current signal is directly loaded on the main amplifier, so the corresponding pre-stored pump power will be relatively large. This will cause the laser to have a large laser power output before the main current of the laser is turned on, which is commonly known as "light leakage". Strong light leakage will affect process applications. Similarly, under the same current accuracy, the variation in output pump power will be greater, which will further aggravate the phenomenon of excessively high peak value of the first pulse in the optical pulse sequence. Summary of the Invention

[0005] Based on this, the present invention provides an adjustable laser pulse sequence control device and a laser pulse sequence optimization method. By loading an independent optical pulse compensation electrical signal on the optical amplification module, the "light leakage" phenomenon is effectively avoided while also effectively controlling the intensity of the initial sequence in the optical pulse sequence and optimizing the amplitude distribution of the output optical pulse sequence.

[0006] In a first aspect, the present invention provides a control device for an adjustable laser pulse sequence, comprising: a pulsed laser source for emitting an initial optical pulse sequence; an optical amplification module connected to the pulsed laser source; a control module connected to the pulsed laser source and the optical amplification module, respectively; and a calculation module connected to the control module for generating an optical pulse compensation electrical signal; wherein the control module is configured to control the pulsed laser source to emit the initial optical pulse sequence, control the optical amplification module to perform power pre-amplification on the initial optical pulse sequence, perform main power amplification on the power-preamplified initial optical pulse sequence to obtain an intermediate optical pulse sequence, and perform power compensation on the intermediate optical pulse sequence according to the optical pulse compensation electrical signal to output a target optical pulse sequence of equal amplitude.

[0007] In a second aspect, the present invention provides a method for optimizing a laser pulse sequence, comprising the steps of:

[0008] S1, 1 controls the pulse laser source to emit an initial light pulse sequence through a control module;

[0009] S12, generating an optical pulse compensation electrical signal according to a software program set in the operation module, and sending the optical pulse compensation electrical signal to the control module;

[0010] S13. When the initial optical pulse sequence reaches the optical amplification module, controlling the optical amplification module through the control module to perform power pre-amplification on the initial optical pulse sequence;

[0011] S14. Controlling the optical amplification module through the control module to perform main power amplification on the initial optical pulse sequence after power pre-amplification to obtain an intermediate optical pulse sequence, and performing power compensation on the intermediate optical pulse sequence according to the optical pulse compensation electrical signal to output a target optical pulse sequence with equal amplitude.

[0012] Beneficial effects of the present invention:

[0013] The present invention provides a control device for an adjustable laser pulse sequence, comprising: a pulsed laser source for emitting an initial optical pulse sequence; an optical amplification module connected to the pulsed laser source; a control module connected to the pulsed laser source and the optical amplification module, respectively; and a calculation module connected to the control module for generating an optical pulse compensation electrical signal. The control module is configured to control the pulsed laser source to emit the initial optical pulse sequence, control the optical amplification module to pre-amplify the initial optical pulse sequence, perform main power amplification on the pre-amplified initial optical pulse sequence to obtain an intermediate optical pulse sequence, and perform power compensation on the intermediate optical pulse sequence according to the optical pulse compensation electrical signal to output a target optical pulse sequence of equal amplitude. Compared to the prior art, the present invention effectively avoids the "light leakage" phenomenon by loading an independent optical pulse compensation electrical signal on the optical amplification module, while also effectively controlling the intensity of the initial sequence in the output optical pulse sequence and optimizing the amplitude distribution of the output optical pulse sequence.

[0014] In addition, the present invention also provides a laser pulse sequence optimization method, which uses the above-mentioned adjustable laser pulse sequence control device to perform pulse sequence optimization, and simplifies and improves the accuracy of power compensation of the optical pulse output by the optical amplifier module by independently loading the optical pulse compensation electrical signal on the optical amplifier module. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 Fiber lasers based on master oscillator power amplification in the prior art;

[0017] Figure 2 Based on the existing technology Figure 1 Schematic diagram of the shape of the optical pulse sequence output by the fiber laser;

[0018] Figure 3 Based on the existing technology Figure 1 A schematic diagram of the shape of an optical pulse sequence output by a fiber laser after power compensation by setting a low-intensity pre-current signal;

[0019] Figure 4 Based on the existing technology Figure 1 A schematic diagram of another optical pulse sequence output by a fiber laser after power compensation by setting a pre-current signal with a relatively high intensity;

[0020] Figure 5 A structural block diagram of a control device for adjustable laser pulse sequence provided by an embodiment of the present invention;

[0021] Figure 6 A schematic diagram of the shape of an output optical pulse sequence of a pulse-tunable fiber laser provided by an embodiment of the present invention;

[0022] Figure 7 A block diagram of the structure of a control device for adjustable laser pulse sequences provided by an embodiment of the present invention;

[0023] Figure 8 based on Figure 7 Specific structural block diagram of the control module in;

[0024] Figure 9 A specific control principle diagram of a control device with adjustable laser pulse sequence provided by an embodiment of the present invention;

[0025] Figure 10 A flowchart of a laser pulse sequence optimization method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] It should be noted that when an element is described as being "provided on" / "set on" another element, it can be directly on the other element, or one or more intermediate elements can exist therebetween. In addition, in this specification, the words "first" and "second" do not limit the order of data and execution, but only distinguish between items with basically the same or similar functions and effects. The present invention defines the position of components with reference to the output / emission direction of the signal light. The input end and output end refer to the input end and output end of the laser, unless specifically referring to the input and output of the pump light. For example, Figure 1 The laser light is output from the laser output module 40 ′.

[0028] In the prior art, Figure 1 As shown, the fiber laser based on master oscillator power amplification includes: a seed source 10', a preamplifier 20', a main amplifier 30' and a laser output module 40' arranged in sequence along the laser output direction, wherein the preamplifier 20' includes: a first beam combiner 202', a first gain fiber 203', a first isolator 204' and a preamplifier stage pump source 201' connected to the first beam combiner 202', which are arranged in sequence along the laser output direction; the main amplifier 30' includes a second beam combiner 302', a second gain fiber 303', and a main amplifier stage pump source 30'1 connected to the second beam combiner 302', which are arranged in sequence along the laser output direction; the first isolator 204' is connected to the second beam combiner 302'; and the second gain fiber 303' is connected to the laser output module 40. However, as Figure 1 The fiber laser shown in the figure has a gradually increasing pulse amplitude in the first few cycles of the output light pulse. Figure 2 In order to make the initial period light pulse and the stabilized light pulse output with equal amplitude, a conventional continuous and small amplitude pre-current signal is usually loaded on the pre-amplifier 20' or the main amplifier. However, the technical effect of this solution is not obvious, and there are defects such as "light leakage" and excessive pulse height. Figure 3 and Figure 4 shown.

[0029] Therefore, the embodiment of the present invention provides a control device with adjustable laser pulse sequence, such as Figure 5As shown, it includes: a pulse laser source 10 for emitting an initial optical pulse sequence, which is an initial optical pulse whose pulse waveform, pulse amplitude and pulse width can be arbitrarily controlled; an optical amplifier module 20, connected to the pulse laser source 10; a control module 30, respectively connected to the pulse laser source 10 and the optical amplifier module 20; an operation module 40, connected to the control module 30, for generating an optical pulse compensation electrical signal, wherein the optical pulse compensation electrical signal is a high-level pulse electrical signal, specifically a pulse electrical signal S composed of a rising edge, a peak and a falling edge; wherein the control module 30 is used to control the pulse laser source 10 to emit the initial optical pulse sequence, control the optical amplifier module 20 to perform power pre-amplification on the initial optical pulse sequence, and perform main power amplification on the initial optical pulse sequence after power pre-amplification to obtain an intermediate optical pulse sequence, and perform power compensation on the intermediate optical pulse sequence according to the optical pulse compensation electrical signal to output a target optical pulse sequence c3 of equal amplitude, as shown Figure 6 shown.

[0030] Specifically, in this embodiment, Figure 7 As shown, the control device for adjustable laser pulse sequence includes: a timing module 50, which is connected to the control module 30, and is used to control the optical amplification module 20 through the control module 30 to perform power compensation in advance or at the same time as the main power amplification of the initial optical pulse sequence after power pre-amplification.

[0031] Furthermore, the control device for an adjustable laser pulse sequence further includes a waveform generator 60 and a photodetector 70. The waveform generator 60 is connected to the control module 30. The photodetector 70 is disposed at the output of the optical amplification module 20 and is also connected to the control module 30. The waveform generator 60 is configured to generate and transmit an electrical signal corresponding to the initial optical pulse sequence, a high-level pre-amplified electrical signal, and a high-level main amplified electrical signal to the control module 30. The photodetector 70 is configured to monitor the optical pulse sequence output from the output of the optical amplification module 20. The optical pulse sequence includes an initial optical pulse sequence, an intermediate optical pulse sequence c, and a target optical pulse sequence c3. Based on the optical pulse sequence monitored by the photodetector 70, the control module 30 acquires and stores one or more parameters of the amplitude and envelope of the optical pulse sequence.

[0032] It should be noted that the waveform generator 60 can also configure the initial light pulse compensation electrical signal S0 to the control module 30 based on empirical values, so that the calculation module 40 performs a logical operation based on the initial light pulse compensation electrical signal S0 and the rising envelope amplitude and the sequence corresponding to the amplitudes included in the light pulse electrical signal sent by the photodetector 70 to obtain the compensated light pulse electrical signal S. The waveform generator 60 can be a host computer, a display screen equipped with an industrial computer, or an electronic terminal equipped with an interface.

[0033] Furthermore, in this embodiment, if Figure 8 The control module includes: a processor 301, a memory 302 and an execution module 303 respectively connected to the processor 301, and a laser source driving circuit 304, a pre-amplifier stage driving circuit 305, a main amplifier stage driving circuit 306, and a compensation driving circuit 307 respectively connected to the execution module 303. The laser source driving circuit 304 is connected to the pulse laser source 10, and the pre-amplifier stage driving circuit 305, the main amplifier stage driving circuit 306, and the compensation driving circuit 307 are connected to the optical amplification module 20. The waveform generator 60 and the processor 701 can communicate via a network port or a serial port.

[0034] Specifically, combined Figure 9 As shown, the optical amplification module 20 includes a pre-amplifier 201 and a main amplifier 202. The pulse laser source 10, the pre-amplifier 201, and the main amplifier 202 are arranged in sequence along the laser output direction. The pre-amplifier stage driving circuit 305 is connected to the pre-amplifier 305, and the main amplifier stage driving circuit 306 and the compensation driving circuit 307 are connected to the main amplifier 202.

[0035] It should be noted that, in this embodiment, Figure 9 As shown, combined with Figure 8 In the prior art, if the pre-amplified signal is directly loaded onto the main amplifier stage pump source 2021, generally speaking, the main amplifier stage pump source 2021 includes one or more high-power output pump sources, and the corresponding stored pump power will be relatively large. Before the main current of the fiber laser is turned on, it will cause the fiber laser to have a large laser power output, that is, to generate strong light leakage. Similarly, under the same current accuracy, the variation of the output pump power will be greater, which will further aggravate the phenomenon of the first pulse peak being too high. If a compensation pump source 2024 is used to load the compensation optical pulse electrical signal S, light leakage can be effectively avoided and the target optical pulse sequence output of equal amplitude can be obtained. The compensation pump source 2024 is a low-power output pump source, and its power is generally within 10W.

[0036] Specifically, the control device for the adjustable laser pulse sequence also includes: an output module 80, the main amplifier 202 includes: a main amplifier stage pump source 2021, a compensation pump source 2024, a first combiner 2022 and a first gain fiber 2023, the pulse laser source 10, the pre-amplifier 201, the first combiner 2022, the first gain fiber 2023, and the output module 80 are arranged in sequence along the laser output direction, the main amplifier stage pump source 2021 and the compensation pump source 2024 are both connected to the first combiner 2022, the main amplifier stage drive circuit 306 is connected to the main amplifier stage pump source 2021, and the compensation drive circuit 307 is connected to the compensation pump source 2024. Furthermore, the pre-amplifier 201 includes a pre-amplifier stage pump source 2011, a second combiner 2012, a second gain fiber 2013, and an isolator 2014. The pulsed laser source 10, the second combiner 2012, the second gain fiber 2013, the isolator 2014, the first combiner 2022, the first gain fiber 2023, the laser output module 80, and the photodetector 70 are arranged in sequence along the laser output direction. The pre-amplifier stage pump source 2011 is connected to the second combiner 202, the main amplifier stage pump source 2021 and the compensation pump source 2024 are both connected to the first combiner 2022, and the pre-amplifier driving circuit 302 is connected to the pre-amplifier stage pump source 2011 in the pre-amplifier 201. The laser output module 80 is a laser beam header (QBH), a laser collimator (QCS), or a laser isolator (ISO). If the control device with adjustable laser pulse sequence is applied to a medium- to high-power fiber laser, the laser output module 80 is a laser beam header (QBH). If the control device with adjustable laser pulse sequence is applied to a low-power fiber laser, the laser output module 40 is a laser collimator (QCS) or a laser isolator (ISO). The power that the compensation pump source 2024 can load is less than the power that the main amplifier stage pump source 2021 can load. Specifically, the power that the main amplifier stage pump source 2021 can load is 10 to 100 times the power that the compensation pump source 2024 can load.

[0037] It should be noted that the timing module 50 is used to simultaneously or with a delay enable the pre-amplifier stage pump source 2011 and the main amplifier stage pump source 2021 to operate after the initial optical pulse sequence is emitted by the pulse laser source 10, so as to suppress the spontaneous radiation generated by the main amplifier 202 and reduce the power consumption of the pulse laser source 10, the pre-amplifier stage pump source 2011 and the main amplifier stage pump source 2021; and is also used to simultaneously or with a delay enable the main amplifier stage pump source 2021 to load a high-level main amplifier electrical signal to the initial optical pulse sequence after pre-power amplification for power amplification after the compensation pump source 2024 loads the optical pulse compensation electrical signal, so as to obtain a target optical pulse sequence c3 of equal amplitude.

[0038] Furthermore, the control module 30 also includes: a first digital-to-analog converter (not shown) connected to the laser source drive circuit 304 and the pulsed laser source 10, respectively; a second digital-to-analog converter (not shown) connected to the pre-amplifier stage drive circuit 305 and the pre-amplifier 201, respectively; a third digital-to-analog converter (not shown) connected to the main amplifier stage drive circuit 306 and the main amplifier stage pump source 2021, respectively; and a fourth digital-to-analog converter (not shown) connected to the compensation drive circuit 307 and the compensation pump source 2024, respectively. The first, second, third, and fourth digital-to-analog converters are 10-bit DAC chips, achieving a data refresh rate of 10 ns; the processor 701 is a single-chip microcomputer (MCU), and the execution module is an FPGA or a CPLD.

[0039] In addition, an embodiment of the present invention further provides a laser pulse sequence optimization method, which uses a laser pulse sequence adjustable control device provided in this embodiment to optimize the pulse sequence, such as Figure 10 As shown, combined with Figures 4 to 9 , including the steps of:

[0040] S1. 1 controls 30 the pulse laser source 10 to emit an initial light pulse sequence through a control module;

[0041] S12, generating an optical pulse compensation electrical signal S according to a software program set in the computing module 40, and sending the optical pulse compensation electrical signal S to the control module 40;

[0042] S13, when the initial optical pulse sequence reaches the optical amplification module 20, controlling the optical amplification module 20 through the control module 30 to perform power pre-amplification on the initial optical pulse sequence;

[0043] S14. Control the optical amplification module 20 through the control module 30 to perform main power amplification on the initial optical pulse sequence after power pre-amplification to obtain an intermediate optical pulse sequence, and perform power compensation on the intermediate optical pulse sequence according to the optical pulse compensation electrical signal S to output a target optical pulse sequence with equal amplitude.

[0044] Furthermore, in step S14, specifically, the control module 30 controls the optical amplification module 20 to perform main power amplification on the initial optical pulse sequence after power pre-amplification to obtain an intermediate optical pulse sequence, and the control module performs power compensation on the intermediate optical pulse sequence according to the high-level optical pulse compensation electrical signal in advance or simultaneously to output a target optical pulse sequence with equal amplitude.

[0045] Before step S11, the method further includes step S10 of sending the electrical signal corresponding to the initial optical pulse sequence, the high-level pre-amplified electrical signal, and the high-level main-amplified electrical signal to the control module 30, and the control module 30 acquires and stores the electrical signal corresponding to the initial optical pulse sequence, the high-level pre-amplified electrical signal, and the high-level main-amplified electrical signal.

[0046] The laser pulse sequence optimization method further includes: step S15, monitoring and determining whether the output optical pulse sequence is a target optical pulse sequence of equal amplitude; if the output optical pulse sequence is the target optical pulse sequence c3 of equal amplitude, controlling the optical amplification module 20 to continue loading the pulse compensation electrical signal S to operate; if the output optical pulse sequence is a non-equal amplitude optical pulse sequence, the operation module dynamically adjusts the new pulse compensation electrical signal using a PID iterative algorithm, the control module 30 receives and updates the pulse compensation electrical signal until the output optical pulse sequence is the target optical pulse sequence c3 of equal amplitude, and stores the latest updated pulse compensation electrical signal S and uses it to control the operation of the optical amplification module 20.

[0047] It should be noted that the control module 30 obtains parameters corresponding to the optical pulse sequence based on the photodetector 70, including: a pulse sequence, a maximum pulse amplitude, a minimum pulse amplitude, and a sequence corresponding to the maximum pulse amplitude and a sequence corresponding to the minimum pulse amplitude. The time for obtaining the optical pulse sequence through the control module 30 is within 200 μs. To ensure that the obtained optical pulse parameters are more comprehensive, it is preferably 100 to 200 μs. The operation module 40 performs a logical operation based on the initial optical pulse compensation electrical signal S0 and the parameters corresponding to the acquired optical pulse sequence obtained by the control module to obtain the optical pulse compensation electrical signal S. The operation module 40 can be configured with the initial optical pulse compensation electrical signal S0, or obtained from the waveform generator 60.

[0048] The laser pulse sequence method described in this embodiment uses the adjustable laser pulse sequence control device described in this embodiment to optimize the pulse sequence, specifically as follows:

[0049] Step S10: The processor 301 in the control module 30 obtains an electrical signal corresponding to the initial optical pulse sequence, a high-level pre-amplified electrical signal, and a high-level main-amplified electrical signal; wherein the electrical signal corresponding to the initial optical pulse sequence, the high-level pre-amplified electrical signal, and the high-level main-amplified electrical signal can be obtained from the waveform generator 60 and then stored, or can be directly obtained from the memory 302 stored in the control module 30.

[0050] In step S1, 1, the processor 301 in the control module 30 performs programming control on the execution module 303 according to the electrical signal corresponding to the initial light pulse sequence. The execution module 303 drives and controls the laser source driving circuit 304 so that the laser source driving circuit drives the pulse laser source 10 to emit the initial light pulse sequence.

[0051] Step S12 : generating an optical pulse compensation electrical signal S according to a software program set in the operation module 40 , and sending the optical pulse compensation electrical signal S to the control module 40 .

[0052] Step S13: When the initial optical pulse passes through the pre-amplifier 201, the processor 701 in the control module 30 performs programming control on the execution module 303 according to the high-level pre-amplified electrical signal. The execution module 303 drives and controls the pre-amplification stage driving circuit 305 simultaneously or with a delay. The pre-amplification stage driving circuit 305 drives the pre-amplification stage pump source 2011 in the pre-amplifier 201 to load the pre-amplified electrical signal to perform power pre-amplification on the initial optical pulse sequence. The time after the pre-amplification stage pump source 201 starts loading the pre-amplification electrical signal is recorded as T1, and the time after the pre-amplification stage pump source 201 stops loading the pre-amplification electrical signal is recorded as T4.

[0053] Step S14: When the initial optical pulse sequence after power pre-amplification passes through the main amplifier 202, the processor 301 in the control module 30 programs and controls the execution module 303 based on the optical pulse compensation electrical signal S. The execution module 303 drives and controls the compensation driving circuit 307. The compensation driving circuit 307 drives the compensation pump source 2024 in the main amplifier to apply the optical pulse compensation electrical signal S. Simultaneously or with a delay, the main amplifier stage driving circuit 306 drives and controls the main amplifier stage driving circuit 306. The main amplifier stage driving circuit 306 drives the main amplifier stage pump source 2021 in the main amplifier 202 to apply a high-level main amplifier electrical signal to the initial optical pulse sequence after power pre-amplification for power amplification, thereby obtaining an intermediate optical pulse sequence. When the intermediate optical pulse sequence is applied with the optical pulse compensation electrical signal S, it ultimately outputs a target optical pulse sequence c3 of equal amplitude. The time when the main amplifier stage pump source applies the main amplifier electrical signal is denoted as T2, and the time when the main amplifier stage pump source stops applying the main amplifier electrical signal is denoted as T3.

[0054] Specifically, the time from when the pre-amplifier stage pump source 2011 begins loading the pre-amplifier signal to when the main amplifier stage pump source 2021 loads the main amplifier signal is within 3 ms (T2-T1). The pre-amplifier stage pump source 2011 loads the pre-amplifier signal and the main amplifier stage pump source 2021 loads the main amplifier signal. The pre-amplifier stage pump source 2011 loads the pre-amplifier signal before the main amplifier stage pump source 2021 loads the pre-amplifier signal. The load signal is turned off earlier than the load signal of the main amplifier stage pump source 2021, i.e., T4-T3≥0. This prevents the main amplifier 202 from performing power amplification before the pre-amplifier 201 output laser is injected into the main amplifier 202. This power amplification may generate self-pulses with high peak power, thereby damaging optical fibers, such as the first gain fiber 2023.

[0055] In step S15, the optical pulse sequence output from the main amplifier 30 is monitored by the photodetector 70, and the processor 301 in the control module 30 determines whether the optical pulse sequence output from the main amplifier 202 is a target optical pulse sequence of equal amplitude. If the optical pulse sequence output from the main amplifier is the target optical pulse sequence c3 of equal amplitude, the control module 30 controls the compensating pump source 2024 to continue loading the pulse compensating electrical signal S. If the instantaneous optical pulse output from the main amplifier 202 is a non-equal amplitude optical pulse sequence, the processor 301 in the control module 30 uses a PID iterative algorithm to dynamically adjust and update the pulse compensating electrical signal S until the optical pulse sequence output from the main amplifier 202 is the target optical pulse sequence of equal amplitude. The processor 301 in the control module 30 stores the last updated optical pulse compensating electrical signal and uses it to control the operation of the compensating pump source 2024. It should be noted that the PID iterative algorithm described in this embodiment refers to an automatic control iterative optimization method based on PID.

[0056] In summary, an embodiment of the present invention provides a control device for an adjustable laser pulse sequence, comprising: a pulsed laser source 10, configured to emit an initial optical pulse sequence, which is an initial optical pulse whose pulse waveform, pulse amplitude, and pulse width can be arbitrarily controlled; an optical amplification module 20, connected to the pulsed laser source 10; a control module 30, respectively connected to the pulsed laser source 10 and the optical amplification module 20; and an operation module 40, connected to the control module 30, configured to generate an optical pulse compensation electrical signal. The control module 30 is configured to control the pulsed laser source 10 to emit the initial optical pulse sequence, control the optical amplification module 20 to perform power pre-amplification on the initial optical pulse sequence, perform main power amplification on the power-preamplified initial optical pulse sequence to obtain an intermediate optical pulse sequence, and perform power compensation e on the intermediate optical pulse sequence according to the optical pulse compensation electrical signal to output a target optical pulse sequence c3 of equal amplitude. Compared with the prior art, this embodiment effectively avoids the "light leakage" phenomenon by loading an independent high-level optical pulse compensation electrical signal on the optical amplification module 20, while also effectively controlling the intensity of the initial sequence in the output optical pulse sequence and optimizing the amplitude distribution of the output optical pulse sequence.

[0057] In addition, this embodiment also provides a laser pulse sequence optimization method, which uses the above-mentioned adjustable laser pulse sequence control device to optimize the pulse sequence. By independently loading a high-level optical pulse compensation electrical signal on the optical amplifier module 20, the accuracy of the power compensation of the optical pulse output by the optical amplifier module 20 is simplified and improved.

[0058] The above is a detailed introduction to a control device with adjustable laser pulse sequence and a laser pulse sequence optimization method provided in an embodiment of the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of the present invention, there may be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A control device for adjustable laser pulse sequence, characterized in that: include: a pulsed laser source for emitting an initial sequence of light pulses; an optical amplification module, connected to the pulse laser source; A control module, connected to the pulse laser source and the optical amplification module respectively; The operation module is connected to the control module and is used to generate an optical pulse compensation electrical signal; wherein, The optical pulse compensation electrical signal is a high-level pulse electrical signal; the control module is used to control the pulse laser source to emit an initial optical pulse sequence, control the optical amplification module to perform power pre-amplification on the initial optical pulse sequence, perform main power amplification on the initial optical pulse sequence after power pre-amplification to obtain an intermediate optical pulse sequence, and perform power compensation on the intermediate optical pulse sequence according to the optical pulse compensation electrical signal to output a target optical pulse sequence of equal amplitude; The optical amplification module includes a pre-amplifier and a main amplifier, and the main amplifier includes a main amplification stage pump source and a compensation pump source; The compensation pump source is used to load the optical pulse compensation electrical signal.

2. The control device for adjustable laser pulse sequence according to claim 1, characterized in that: include: The timing module is connected to the control module and is used to control the optical amplification module through the control module to perform power compensation in advance or simultaneously with the main power amplification of the initial optical pulse sequence after power pre-amplification.

3. The control device for adjustable laser pulse sequence according to claim 1, characterized in that: include: A waveform generator and a photodetector, wherein the waveform generator is connected to the control module, and the photodetector is provided at the output end of the optical amplification module and is connected to the control module; wherein, The waveform generator is used to send an electrical signal corresponding to the initial optical pulse sequence, a high-level pre-amplified electrical signal, and a high-level main amplified electrical signal to the control module. The photodetector is used to monitor the optical pulse sequence output from the output end of the optical amplification module, where the optical pulse sequence includes an initial optical pulse sequence, an intermediate optical pulse sequence, and a target optical pulse sequence.

4. The control device for adjustable laser pulse sequence according to any one of claims 1 to 3, characterized in that: The control module includes: a processor, a memory and an execution module respectively connected to the processor, and a laser source driving circuit, a pre-amplifier stage driving circuit, a main amplifier stage driving circuit, and a compensation driving circuit respectively connected to the execution module. The laser source driving circuit is connected to the pulsed laser source, and the pre-amplifier stage driving circuit, the main amplifier stage driving circuit, and the compensation driving circuit are connected to the optical amplification module.

5. The control device for adjustable laser pulse sequence according to claim 4, characterized in that: The pulse laser source, preamplifier and main amplifier are sequentially arranged along the laser output direction; the preamplifier stage driving circuit is connected to the preamplifier; and the main amplifier stage driving circuit and compensation driving circuit are connected to the main amplifier.

6. The control device for adjustable laser pulse sequence according to claim 5, characterized in that: include: The output module, the main amplifier also includes a first beam combiner and a first gain fiber, the pulsed laser source, the pre-amplifier, the first beam combiner, the first gain fiber, and the output module are arranged in sequence along the laser output direction, the main amplifier stage pump source and the compensation pump source are both connected to the first beam combiner, the main amplifier stage drive circuit is connected to the main amplifier stage pump source, and the compensation drive circuit is connected to the compensation pump source.

7. A laser pulse sequence optimization method, comprising: optimizing a laser pulse sequence using the adjustable laser pulse sequence control device according to any one of claims 1 to 6, wherein: The method comprises the steps of: Step S11, controlling the pulse laser source to emit an initial light pulse sequence through a control module; Step S12: generating an optical pulse compensation electrical signal according to a software program set in the operation module, and sending the optical pulse compensation electrical signal to the control module; Step S13: When the initial optical pulse sequence reaches the optical amplification module, the control module controls the optical amplification module to perform power pre-amplification on the initial optical pulse sequence; Step S14: The control module controls the optical amplification module to perform main power amplification on the initial optical pulse sequence after power pre-amplification to obtain an intermediate optical pulse sequence, and performs power compensation on the intermediate optical pulse sequence according to the optical pulse compensation electrical signal to output a target optical pulse sequence with equal amplitude.

8. The laser pulse sequence optimization method according to claim 7, wherein: Specifically, step S14 controls the optical amplification module to perform main power amplification on the initial optical pulse sequence after power pre-amplification to obtain an intermediate optical pulse sequence, and performs power compensation on the intermediate optical pulse sequence in advance or simultaneously with the control module according to the low-level optical pulse compensation electrical signal to output a target optical pulse sequence with equal amplitude.

9. The laser pulse sequence optimization method according to claim 7, wherein: The method further comprises: Step S10: Sending the electrical signal corresponding to the initial optical pulse sequence, the high-level pre-amplified electrical signal, and the high-level main amplified electrical signal to the control module, and the control module acquiring and storing the electrical signal corresponding to the initial optical pulse sequence, the low-level pre-amplified electrical signal, and the high-level main amplified electrical signal.

10. The laser pulse sequence optimization method according to claim 9, wherein: The method further comprises: Step S15: Monitor and determine whether the output optical pulse sequence is a target optical pulse sequence of equal amplitude. If the output optical pulse sequence is a target optical pulse sequence of equal amplitude, control the optical amplification module to continue loading the pulse compensation electrical signal to operate. If the output optical pulse sequence is a non-equal amplitude optical pulse sequence, the operation module dynamically adjusts the new pulse compensation electrical signal using a PID iterative algorithm. The control module receives and updates the pulse compensation electrical signal until the output optical pulse sequence is the target optical pulse sequence of equal amplitude. The control module stores the latest updated pulse compensation electrical signal and uses it to control the operation of the optical amplification module.

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