A method and apparatus for suppressing fiber laser spike pulses

Abstract

The application provides a method and device for inhibiting the spike pulse of a fiber laser, wherein the method comprises: generating an original pump signal, and obtaining the amplitude and width of the original pump signal; obtaining a first laser signal generated based on the original pump signal, and detecting the amplitude of the spike pulse in the first laser signal waveform, the amplitude when the first laser signal waveform is stable, and the delay time; determining the width and initial amplitude of an inhibition signal for inhibiting the spike pulse based on the detected data; modulating the original pump signal by using the inhibition signal to generate a second pump signal; and driving the fiber laser by using the second pump signal to generate a second laser signal. The method for inhibiting the spike pulse of the fiber laser generates a square wave for inhibiting the spike pulse before the square wave of the pump source signal, so that the laser signal completely follows the pump source signal, and a standard square wave output is formed.

Description

[0001] This application is a divisional application of the invention patent filed on November 10, 2023, with the Chinese Intellectual Property Office, entitled "A method and apparatus for suppressing spike pulses in a fiber laser", application number 202311504138.0. Technical Field

[0002] This invention relates to the field of fiber lasers, and more specifically, to a method and apparatus for suppressing spike pulses in fiber lasers. Background Technology

[0003] An optical fiber oscillator comprises a pump source, a laser medium, a gain medium, and optical components. The pump source injects energy into the laser medium, exciting ions to an excited state. These excited ions then generate laser light through stimulated emission, which is amplified in the gain medium within the optical fiber. The optical components are used to adjust, output, and control the laser beam.

[0004] Quasi-continuous fiber lasers have a relatively long output pulse duration, falling between that of continuous-wave fiber lasers and pulsed fiber lasers. Quasi-continuous lasers typically use a high-energy pulsed pump source as their energy input. The pump source provides energy to the laser medium in pulse form, exciting doped particles in the gain fiber. This energy is then reflected and enhanced at a specific wavelength through a suitable resonant cavity, ultimately forming a quasi-continuous laser output.

[0005] Quasi-continuous lasers typically have pulse widths in the microsecond range or longer, which is significantly longer than pulsed lasers. Quasi-continuous lasers generally offer high energy output. Their output is relatively stable, with relatively uniform energy and time intervals between pulses, providing a stable light source.

[0006] In an oscillator-pumped modulated fiber laser, the pump source is modulated by a modulator and then injected into the fiber oscillator. Within the oscillator, the light undergoes multiple reflections and amplifications, generating oscillations and amplification effects, ultimately resulting in laser output. The oscillator structure gives the fiber laser high power conversion efficiency. The optical amplification process within the oscillator structure effectively converts pump light energy into laser light energy, reducing energy loss. This allows fiber lasers to provide high output power, making them suitable for applications requiring high-power lasers, such as materials processing and laser communication.

[0007] In fiber lasers based on oscillator structures, the laser output is unstable immediately after the pump signal is applied, resulting in a strong pulse output with a peak value several times or even ten times higher than the stable output, before reaching a stable output. This phenomenon is particularly pronounced in quasi-continuous lasers based on oscillator-pumped modulation, where each pulse begins with a strong spike.

[0008] The generation of spike pulses can have adverse effects on fiber laser applications, such as generating additional noise and reducing the stability of laser output, thus affecting the stability of the entire application system. Therefore, when designing and optimizing quasi-continuous lasers, measures need to be taken to suppress the generation of spike pulses.

[0009] Currently, existing technologies generally do not have a good method for suppressing spike pulses. Summary of the Invention

[0010] This invention provides a method and apparatus for suppressing spike pulses in fiber lasers, effectively suppressing spike pulses in the output laser signal of fiber lasers.

[0011] In a first aspect, the present invention provides a method for suppressing spike pulses in a fiber laser, the method comprising:

[0012] Generate the raw pump signal and obtain its amplitude and width;

[0013] The waveform of the first laser signal generated based on the original pump signal is obtained, and the amplitude of the spike pulse in the waveform of the first laser signal, the amplitude when the waveform of the first laser signal is stable, and the delay time relative to the original pump signal are detected.

[0014] Based on the amplitude of the detected original pump signal, the amplitude of the first laser signal waveform when it is stable, the delay time, and the amplitude of the spike pulse, the width and starting amplitude of the suppression signal used to suppress the spike pulse are determined.

[0015] The original pump signal is modulated using the suppression signal to generate a second pump signal;

[0016] The second pump signal is used to drive the fiber laser to generate a second laser signal.

[0017] In one embodiment of the present invention, determining the width and initial amplitude of the suppression signal for suppressing the spike pulse based on the amplitude and delay time of the detected spike pulse further includes the following steps:

[0018] Calculate a first ratio between the amplitude of the first laser signal waveform when it is stable and the amplitude of the spike pulse; determine the initial amplitude of the suppression signal based on the first ratio and the amplitude of the original pump signal; or

[0019] Calculate a second ratio between the amplitude of the original pump signal and the amplitude of the spike pulse; determine the initial amplitude of the suppression signal based on the second ratio and the amplitude when the first laser signal waveform is stable; and

[0020] The delay time is determined as the width of the suppression signal.

[0021] In another embodiment of the present invention, determining the initial amplitude of the suppression signal based on the first ratio and the amplitude of the original pump signal further includes the following steps:

[0022] Multiplying the first ratio by the amplitude of the original pump signal determines the initial amplitude of the suppression signal; or

[0023] Determining the initial amplitude of the suppression signal based on the second ratio and the amplitude when the first laser signal waveform is stable further includes the following steps:

[0024] The starting amplitude of the suppression signal is determined by multiplying the second ratio by the amplitude when the waveform of the first laser signal is stable.

[0025] In another embodiment of the present invention, wherein modulating the original pump signal with the suppression signal to generate the second pump signal further includes:

[0026] The suppression signal is then added to the leading edge of the original pump signal to generate the waveform of the second pump signal.

[0027] In another embodiment of the invention, the waveform of generating a second pump signal by adding the suppression signal to the leading edge of the original pump signal further includes the following step:

[0028] The suppression signal rises from the initial amplitude to the amplitude of the original pump signal.

[0029] In another embodiment of the present invention, wherein modulating the original pump signal with the suppression signal to generate the second pump signal further includes:

[0030] The suppression signal is generated upon receiving the original pump signal;

[0031] The original pump signal is delayed by the width of the suppression signal;

[0032] The generated suppression signal is added to the delayed original pump signal to obtain the second pump signal.

[0033] In another embodiment of the present invention, wherein modulating the original pump signal with the suppression signal to generate the second pump signal further includes:

[0034] The width of the suppressed signal is determined to be the width of the modulated signal;

[0035] The initial amplitude of the modulation signal is determined by subtracting the initial amplitude of the suppression signal from the amplitude of the original pump signal.

[0036] The modulation signal is generated upon receiving the original pump signal;

[0037] The original pump signal is subtracted from the modulation signal to generate the second pump signal.

[0038] In another embodiment of the present invention, wherein modulating the original pump signal with the suppression signal to generate the second pump signal further includes:

[0039] The width of the suppressed signal is determined to be the width of the modulated signal;

[0040] The initial amplitude of the modulation signal is determined by subtracting the initial amplitude of the suppression signal from the amplitude of the original pump signal.

[0041] The width of the original pump signal is increased to the width of the suppression signal;

[0042] The second pump signal is generated by subtracting the broadened original pump signal from the modulation signal.

[0043] In a second aspect, the present invention also provides a device for suppressing fiber laser spike pulses, comprising: a primary pump signal generation device, a laser signal detection device, a second pump signal generation device, a computing device, and a fiber laser;

[0044] The original pump signal generation device is used to generate an original pump signal, obtain the amplitude and width of the original pump signal, and feed it back to the computing device;

[0045] The laser signal detection device is used to acquire the waveform of the first laser signal generated by the fiber laser driven by the pump light generated based on the original pump signal, and to detect the amplitude of the spike pulse in the first laser signal waveform, the amplitude when the first laser signal waveform is stable, and the delay time relative to the original pump signal, and feed them back to the computing device.

[0046] The computing device determines the width and initial amplitude of a suppression signal for suppressing the spike pulse based on the amplitude of the detected original pump signal, the amplitude of the first laser signal waveform when it is stable, the delay time, and the amplitude of the spike pulse.

[0047] The second pump signal generating device modulates the original pump signal using the suppression signal to generate a second pump signal;

[0048] The fiber laser is driven by the second pump signal to generate pump light and thus generate a second laser signal.

[0049] In one embodiment of the present invention, the computing device further includes:

[0050] The suppression signal amplitude determination device is used for:

[0051] Calculate a first ratio between the amplitude of the first laser signal waveform when it is stable and the amplitude of the spike pulse; multiply the first ratio by the amplitude of the original pump signal to determine the starting amplitude of the suppression signal; and feed this ratio back to the second pump signal generation device; or

[0052] Calculate a second ratio between the amplitude of the original pump signal and the amplitude of the spike pulse; multiply this second ratio by the amplitude when the first laser signal waveform stabilizes to determine the initial amplitude of the suppression signal; and feed this ratio back to the second pump signal generation device.

[0053] A suppression signal width determining device is used to determine the delay time as the width of the suppression signal and feed it back to a second pump signal generating device.

[0054] In another embodiment of the present invention, the second pump signal generating device further includes a signal generating module, a raw pump signal modulation module, and a merging module;

[0055] The signal generation module generates a suppression signal upon receiving the original pump signal;

[0056] The original pump signal modulation module is used to delay the original pump signal;

[0057] The merging module is used to add the suppressed signal to the delayed original pump signal to generate the second pump signal.

[0058] In another embodiment of the invention, the original pump signal modulation module is used to delay the width of the suppression signal by the original pump signal.

[0059] In another embodiment of the invention, the computing device further includes:

[0060] A modulation signal width determining device is used to determine the suppression signal width as the width of the modulation signal and feed it back to the second pump signal generating device;

[0061] The modulation signal amplitude determination device is used to determine the starting amplitude of the modulation signal by subtracting the starting amplitude of the original pump signal from the starting amplitude of the suppression signal, and then feeds it back to the second pump signal generation device.

[0062] In another embodiment of the present invention, the second pump signal generating device further includes a signal generating module and a merging module;

[0063] The signal generation module generates the modulation signal upon receiving the original pump signal;

[0064] The merging module is used to subtract the modulated signal from the original pump signal to generate the second pump signal.

[0065] In another embodiment of the present invention, the second pump signal generating device further includes an original pump signal modulation module, which is used to widen the width of the original pump signal to widen the width of the suppression signal.

[0066] The merging module is used to subtract the modulated signal from the broadened original pump signal to generate the second pump signal.

[0067] The method for suppressing spike pulse generation in fiber lasers of the present invention involves adding a square wave, or other waveform, to suppress spike pulse generation before the square wave of the pump source signal. By adjusting the appropriate height (power) and width (time), the strong pulse spike of the laser occurs during the rising edge of the main square wave, submerged in the rising edge of the main square wave, so that the laser signal is completely aligned with the pump source signal, forming a standard square wave output. Attached Figure Description

[0068] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. 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 effort.

[0069] Figure 1 This is a schematic diagram of the pump signal and output laser signal under ideal conditions.

[0070] Figure 2A This is a schematic diagram of the original pump signal with a standard square wave shape and the output laser signal containing spike pulses under actual conditions.

[0071] Figure 2B This is a schematic diagram of an output laser signal containing spike pulses, displayed on an oscilloscope used for experimental testing.

[0072] Figures 3A-3D This is a schematic diagram of the suppression of spike pulse pump signals and the output laser signal provided in an embodiment of the present invention.

[0073] Figures 4A-4E This is a schematic diagram of the method for generating the second pump signal according to the present invention.

[0074] Figure 5 This invention relates to a device for suppressing spike pulses in fiber lasers.

[0075] Figure 6 This is a flowchart of the method for suppressing spike pulses in a fiber laser according to the present invention. Detailed Implementation

[0076] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Invention Overview

[0078] The principles and spirit of the invention will now be described with reference to several exemplary embodiments. It should be understood that these embodiments are given merely to enable those skilled in the art to better understand and implement the invention, and are not intended to limit the scope of the invention in any way. Rather, these embodiments are provided to make this disclosure more thorough and complete, and to fully convey the scope of this disclosure to those skilled in the art.

[0079] Figure 1 This diagram illustrates the ideal pump signal and output laser signal. Specifically, the output laser signal exhibits no spike pulses, and the pulse width of the pump signal matches the pulse width of the laser signal.

[0080] Figure 2A The actual pump signal and the generated laser signal are shown. Figure 2A The original pump signal shown is the actual pump signal, and the first laser signal is generated from the original pump signal. The figure shows that the first laser signal always lags behind the original pump signal by a certain time interval; this delay is within... Figure 2A The symbol W represents this. Secondly, the first laser signal generates a high-amplitude spike pulse on its rising edge, and the amplitude of the spike pulse is... Figure 2A In Chinese, H represents... Figure 2A In this context, L represents the amplitude of the first laser signal in its stable state.

[0081] The delay time W is generated because after the pump light emitted from the pump source enters the gain medium, the pump light is absorbed because the gain medium is a rare earth-doped fiber. The rare earth ions that have absorbed photon energy undergo energy level transitions and achieve population inversion. After the inverted particles pass through the resonant cavity, they transition from the excited state back to the ground state, release energy, and form a stable laser output. This process requires a certain amount of time.

[0082] The high-amplitude spike pulse is generated because when the pump beam first supplies energy to the laser medium, the laser medium in the fiber optic oscillator is still responding, and its gain amplification effect has not yet been established. During this process, excited-state particles (such as erbium ions in erbium-doped fiber) gradually accumulate in the laser medium, but the laser photon density is low. As excited-state particles accumulate, when the response of the laser medium in the fiber cavity reaches the critical condition, the generated weak laser signal will be output through the fiber output coupler, forming a spike pulse. This is because the accumulation of excited-state particles is sufficient at this point, and through processes such as stimulated emission and spontaneous emission of the excited-state particles, the weak laser signal is suddenly amplified, forming a suddenly enhanced pulse signal. The peak value H of the spike pulse is generally several times or tens of times the amplitude L of the laser signal when it is stable.

[0083] As time progresses, the number of excited-state particles in the fiber optic oscillator continues to increase, and the oscillation process gradually stabilizes, producing continuous laser output. Therefore, the spike pulse that appears when the pump is first applied is due to the accumulation of excited-state particles and the establishment of laser oscillation, after which the laser output gradually stabilizes.

[0084] Figure 2B This is a schematic diagram of an output laser signal containing spike pulses, displayed on an oscilloscope used for experimental testing. As can be seen from the diagram, there is a very strong pulse at the rising edge of the output laser signal, after which the signal waveform tends to stabilize.

[0085] The purpose of this invention is to synchronize the original pump signal with the first laser signal and suppress the generation of high-amplitude spike pulses. Specifically, the delay time W is reduced, making its value approach 0. This causes the spike pulse at the rising edge of the main square wave of the first laser signal to nearly disappear; that is, the peak value H of the spike pulse is reduced, making H approach the value of L.

[0086] Since the generation of spike pulses is related to a sudden increase in pump beam power in the laser medium of a fiber laser, the occurrence of spike pulses can be reduced by controlling the rise in pump beam power. Subsequently, gradually increasing the pump beam power in the laser medium allows excited-state particles to accumulate slowly and gradually, which helps to stabilize the establishment of laser oscillations.

[0087] The following content will explain the principle of the method for suppressing spike pulse generation described in this application.

[0088] This invention addresses the issue by inputting a second pump signal to the pump source, causing the pulse spike to be submerged during the rising edge of the first laser signal. The second pump signal is generated by modulating the original pump signal, specifically by adding a suppression signal with amplitude (power) A and width (time) K before the original pump signal. Figure 3AAs shown, the waveform of the second pump signal comprises parts 301 and 302, and the second laser signal is generated from the second pump signal. Part 301 of the second pump signal is generated from the suppression signal, and part 302 is generated from the original pump signal. For ease of description and correspondence with the figure, part 301 of the second pump signal will be referred to as the suppression waveform 301, and part 302 will be referred to as the original pump waveform 302.

[0089] The suppressed waveform 301 in the second pump signal first enters the pump source. Based on the current of the suppressed waveform 301, the pump source drives the pump source to generate a pump beam of corresponding intensity. The pump beam enters the laser medium, and the laser medium begins to respond. The width K of the suppressed waveform 301 is exactly the time from the pump beam entering the laser medium to the completion of the laser medium's response. When the laser medium reaches the critical condition, the suppressed waveform 301 has completed its entry, and the pump beam generated by the pump source driven by the original pump waveform 302 begins to enter the laser medium. At this time, a certain degree of excited-state particles have accumulated inside the laser medium, and the laser medium begins to produce an amplification effect. The spike pulse generated by the suppressed waveform 301 is synchronized with the rising edge of the second laser signal, that is, the spike pulse overlaps with the rising edge of the second laser signal. Since the amplitude (power) of the suppressed waveform 301 is less than the amplitude (power) of the original pump waveform 302, the peak value of the spike pulse generated by the suppressed waveform 301 is also less than or equal to the amplitude of the second laser signal. This causes the spike generated by the suppressed waveform 301 to be submerged in the rising edge of the second laser signal generated by the original pump waveform 302. The amplitude (power) of the original pump waveform 302 remains unchanged, and the laser medium has completed its response. The second laser signal is synchronized with the original pump waveform 302, and the width B of the second laser signal is the same as the width of the original pump waveform 302, requiring no additional compensation. At this point, the laser medium has achieved stable gain amplification, and the fiber laser's oscillation output begins to stabilize. Therefore, the laser signal will completely follow the pump source signal, forming a standard square wave output.

[0090] The suppressed waveform 301 can not only be Figure 3A The square wave shown can also be Figure 3B The ramp waveform shown can also be Figure 3C and Figure 3D The arc-shaped transition waveform shown. As long as the amplitude (power) A and width (time) K of the suppressed waveform 301 are appropriate, it can achieve a good suppression effect on spike pulses.

[0091] The following will explain how the present invention generates the second pump signal and generates the second laser signal based on the second pump signal.

[0092] Since the pulse height and delay time in the laser signal are not the same in each laser, it is necessary to obtain the delay time from the application of the pump signal to the laser signal output in advance through testing. Furthermore, the pulse height in the laser signal is proportional to the power of the initial applied pump signal, so the proportional relationship between them can be obtained through testing. To this end, the inventors designed the following test steps:

[0093] First, load Figure 2A The original pump signal shown is used to detect or directly acquire the amplitude V (power) and width T (time) of the original pump signal. (Corresponding to...) Figure 6 Step 601 shown)

[0094] Second, acquire Figure 2A The waveform of the first laser signal generated based on the original pump signal is shown, and the amplitude H of the spike pulse in the first laser signal waveform, the amplitude L when the first laser signal waveform is stable, and the delay time W relative to the original pump signal are detected. (Corresponding to) Figure 6 Step 602 shown)

[0095] Third, based on the magnitude of the detected original pump signal amplitude V (power), the amplitude H of the spike pulse, and the amplitude L when the first laser signal waveform is stable, the initial amplitude A of the suppression signal used to suppress the spike pulse is determined; based on the delay time W, the width K of the suppression signal used to suppress the spike pulse is determined. (Corresponding to...) Figure 6 Step 603 shown)

[0096] The width K of the suppressed signal is the delay time W of the spike pulse relative to the original pump signal. The first ratio between the amplitude L of the first laser signal waveform when it is stable and the amplitude H of the spike pulse is calculated. The first ratio Multiplying the amplitude V of the original pump signal by the result determines the initial amplitude A of the suppressed signal. Alternatively, a second ratio between the amplitude V of the original pump signal and the amplitude H of the spike pulse can be calculated. Based on the second ratio Multiplying the amplitude L of the first laser signal waveform when it is stable, the result determines the initial amplitude A of the suppression signal, i.e., A = (V*L) / H.

[0097] For example: Assume the original pump signal has a width of 50 nanoseconds (ns) and an amplitude of 5 watts (W). The first laser signal has a width of 40 ns and an amplitude of 10 W. The spike pulse has a delay time of 10 ns and an amplitude of 25 W. Note that the amplitude of the pump signal here may be in voltage (volts).

[0098] The width of the suppression signal is set equal to the delay time of the spike pulse, i.e., 10 ns. The first ratio of the amplitude of the first laser signal waveform when it is stable (10 W) to the amplitude of the spike pulse (25 W) is... Multiplying the first ratio by the amplitude 5w of the original pump signal yields the initial amplitude of the suppression signal as 2w; or multiplying the first ratio by the amplitude 5w of the original pump signal and the amplitude 25w of the spike pulse yields the second ratio. Multiplying by the amplitude of the first laser signal waveform when it is stable (10w), the initial amplitude of the suppression signal is also calculated to be 2w.

[0099] During normal operation, the original pump signal is modulated using the suppression signal to generate a second pump signal. There are two methods for generating the second pump signal in this step, which will be described below. (Corresponding to...) Figure 6 Step 604 shown)

[0100] Method 1: After determining the initial amplitude A and width K of the suppression signal, the suppression signal is generated. The suppression signal rises from the initial amplitude A to the amplitude V of the original pump signal. The waveform of the suppression signal can be a square wave, a ramp, or other curved transition waveform. Experiments are conducted to determine which transition waveform yields the best suppression effect.

[0101] When the original pump signal is applied, a suppression signal is generated, and then the original pump signal is delayed by the width K of the suppression signal for a period of time. Figures 4A-4D As shown, the generated suppression signal is added to the delayed original pump signal to obtain the second pump signal.

[0102] Method 2: After determining the initial amplitude A and width K of the suppression signal, the modulation signal is generated. The width of the modulation signal is set to the width K of the suppression signal. The initial amplitude of the modulation signal is determined by subtracting the initial amplitude A of the suppression signal from the amplitude V of the original pump signal.

[0103] For example: Assume the original pump signal has a width of 50 nanoseconds (ns) and an amplitude of 5 watts (W). The first laser signal has a width of 40 ns and an amplitude of 10 W. The spike pulse has a delay time of 10 ns and an amplitude of 25 W. As mentioned above, the calculated width of the suppressed signal is 10 ns, and its initial amplitude is 2 W.

[0104] Therefore, the width of the modulation signal is 10ns, and the difference between the amplitude of the original pump signal (5w) and the initial amplitude of the suppression signal is 3w. Thus, the initial amplitude of the modulation signal is also 3w.

[0105] The modulation signal is generated synchronously upon receiving the original pump signal. For example... Figure 4EAs shown, the original pump signal is subtracted from the modulation signal to generate the second pump signal. The width of the steady-state pump waveform 302 in the second pump signal generated based on the modulation signal and the original pump signal is the width T of the original pump signal minus the width K of the suppression signal.

[0106] If it is desired that the width of the steady-state pump waveform 302 in the generated second pump signal is the same as the width of the original pump signal, then the width of the original pump signal needs to be widened by the width of the suppression signal. That is, the width of the widened original pump signal is equal to the width T of the original pump signal plus the width K of the suppression signal. Then, the widened original pump signal is subtracted from the modulation signal to generate the second pump signal. The advantage of the second method compared to the first method is that it does not require a delay circuit to delay the original pump signal.

[0107] The second pump signal is used to drive the fiber laser to generate a second laser signal. (Corresponding) Figure 6 (Step 605 shown)

[0108] The above two examples illustrate how to obtain the parameters of the suppressed waveform 301 in the second pump signal through specific calculations, and how to generate a second pump signal with a suppressed signal by widening or delaying the original pump signal and subtracting or adding it to another generated modulation signal or suppressed signal. In fact, the parameters of the suppressed waveform 301 can also be obtained through experimental debugging, and a second pump signal with a suppressed signal can be generated directly through a function signal generator.

[0109] Once the width and initial amplitude of the suppressed waveform 301 are determined, they can be input into the function signal generator to directly obtain a second pump signal with the suppressed signal, without the need for additional operations to generate it.

[0110] Obtaining the parameters of the suppressed waveform 301 through experimental debugging requires first estimating the width and initial amplitude of the suppressed waveform 301. The estimated values ​​are then input into a waveform function generator to directly generate a second pump signal waveform with the suppressed signal. This second pump signal is used to drive the fiber laser to generate a laser signal. The width and initial amplitude of the suppressed waveform 301 input to the function signal generator are continuously changed, while simultaneously observing the relative positions and suppression of the spike pulses and square waves in the laser signal waveform output by the fiber laser. This process continues until the laser signal output by the fiber laser is observed to be consistent with the second laser signal mentioned earlier. The values ​​recorded in the function signal generator at this point represent the determined width and initial amplitude of the suppressed waveform 301.

[0111] During observation, if the spike pulse appears before the rising edge of the square wave, the width of the suppression waveform 301 is gradually increased; if the spike pulse lags behind the rising edge of the square wave, the width of the suppression waveform 301 is decreased. If the amplitude of the spike pulse is higher than the amplitude of the square wave, the initial amplitude of the suppression waveform 301 is reduced.

[0112] The specific method used for each of the second pump signal generation methods listed above depends on the user's actual needs and is not limited to the specific implementation methods described in this article.

[0113] Exemplary device

[0114] After introducing the method of exemplary embodiments of the present invention, the following references are made. Figure 5 Exemplary embodiments of the present invention can be implemented using the following apparatus. For example... Figure 5 As shown, the device includes: a primary pump signal generation device 501, a laser signal detection device 504, a second pump signal generation device 502, a computing device 505, and a fiber laser 503, wherein the connection method is as follows:

[0115] The original pump signal generation device 501 is used to generate the original pump signal. During the testing phase, Figure 5 As shown, line a is open and line b is closed. The raw pump signal generation device 501 directly transmits the generated raw pump signal to the fiber laser 503 via line a. Simultaneously, it acquires the amplitude and width of the raw pump signal and feeds them back to the computing device 505.

[0116] After receiving the original pump signal transmitted from line a, the fiber laser 503 drives the pump source in the fiber laser 503 to generate a corresponding pump beam. The pump beam is coupled into the optical cavity through the optical coupler in the fiber laser 503, and the laser medium in the optical cavity begins to amplify the gain and output the first laser signal.

[0117] The laser signal detection device 504 is connected to the output end of the fiber laser 503, acquires the waveform of the first laser signal generated by the fiber laser 503 based on the original pump signal, generates pump light to drive the first laser signal generated by the original pump signal, and detects the amplitude of the peak pulse in the first laser signal waveform, the amplitude when the first laser signal waveform is stable, and the delay time relative to the original pump signal, and feeds it back to the computing device 505.

[0118] After the above operations are completed, the normal operation phase begins. The original pump signal generation device 501 shuts down line a, no longer transmitting the original pump signal to the fiber laser 503, and opens line b to transmit the original pump signal to the second pump signal generation device.

[0119] The computing device 505 receives the amplitude and width of the original pump signal from the original pump signal generation device 501, and the amplitude of the spike pulse in the first laser signal waveform, the amplitude of the first laser signal waveform when it is stable, and the delay time relative to the original pump signal from the laser signal detection device 504. Based on the received data, it calculates the width and initial amplitude of the modulation signal, and the width and initial amplitude of the suppression signal.

[0120] The computing device 505 includes: a suppression signal width determination device 506 and a suppression signal amplitude determination device 507.

[0121] The suppression signal width determining device 506 is used to determine the width of the suppression signal. It determines the delay time as the width of the suppression signal and feeds back the width of the suppression signal to the second pump signal generating device 502.

[0122] The suppression signal amplitude determination device 507 is used to determine the initial amplitude of the suppression signal. It calculates a first ratio between the amplitude of the first laser signal waveform when it is stable and the amplitude of the spike pulse, multiplies the first ratio by the amplitude of the original pump signal to determine the initial amplitude of the suppression signal, and feeds back the initial amplitude of the suppression signal to the second pump signal generation device 502; or it calculates a second ratio between the amplitude of the original pump signal and the amplitude of the spike pulse, multiplies the second ratio by the amplitude of the first laser signal waveform when it is stable to determine the initial amplitude of the suppression signal, and feeds back the initial amplitude of the suppression signal to the second pump signal generation device 502.

[0123] The second pump signal generating device 502 modulates the original pump signal using the suppression signal to generate a second pump signal. The second pump signal generating device 502 includes a signal generating module 511, an original pump signal modulation module 510, and a merging module 512.

[0124] The original pump signal modulation module 510 receives the original pump signal transmitted from the original pump signal generation device 501 via line b, and also receives the width of the suppression signal transmitted from the suppression signal width determination device 506. The original pump signal modulation module 510 delays the original pump signal by the width of the suppression signal. For example, if the width of the suppression signal is 10 ns, then the original pump signal is delayed by 10 ns. The delayed original pump signal is then sent to the merging module 512.

[0125] The signal generation module 511 receives the width of the suppression signal transmitted from the suppression signal width determination device 506, and the initial amplitude of the suppression signal transmitted from the suppression signal amplitude determination device 507. Then, based on these two parameters, it generates the suppression signal when the original pump signal modulation module 510 receives the original pump signal, and simultaneously sends the suppression signal to the merging module 512.

[0126] The merging module 512 adds the received suppression signal to the delayed original pump signal to generate the second pump signal.

[0127] The computing device 505 further includes: a modulation signal width determination device 508 and a modulation signal amplitude determination device 509.

[0128] The modulation signal width determining device 508 is used to determine the width of the modulation signal. It determines the width of the modulation signal based on the delay time and feeds back the width of the modulation signal to the second pump signal generating device 502.

[0129] The modulation signal amplitude determination device 509 is used to determine the starting amplitude of the modulation signal by subtracting the starting amplitude of the original pump signal from the starting amplitude of the suppression signal, and to feed back the starting amplitude of the modulation signal to the second pump signal generation device 502.

[0130] The original pump signal modulation module 510 receives the original pump signal transmitted from the original pump signal generation device 501 through line b, and sends the original pump signal to the merging module 512.

[0131] The signal generation module 511 receives the width of the modulated signal transmitted from the modulated signal width determination device 508, and the initial amplitude of the modulated signal transmitted from the modulated signal amplitude determination device 509. Based on these two parameters, it generates a modulated signal when the original pump signal modulation module 510 receives the original pump signal, and simultaneously sends the modulated signal to the merging module 512.

[0132] The merging module 512 subtracts the received modulation signal from the original pump signal to generate the second pump signal.

[0133] The width of the original pump waveform 302 in the second pump signal generated in the merging module 512 based on the original pump signal output by the original pump signal modulation module 510 and the modulation signal output by the signal generation module 511 is the width of the original pump signal minus the width of the suppression signal. If it is desired that the width of the original pump waveform 302 of the second pump signal output by the merging module is equal to the width of the original pump signal, then the merging module 512, the signal generation module 511, and the original pump signal modulation module 510 in the second pump signal generation device 502 shall perform the following operations:

[0134] The original pump signal modulation module 510 receives the original pump signal transmitted from the original pump signal generation device 501 via line b, and also receives the width of the suppression signal transmitted from the suppression signal width determination device 506. The original pump signal modulation module 510 widens the suppression signal by increasing the width of the original pump signal. For example, if the suppression signal width is 10 ns and the original pump signal width is 50 ns, then the original pump signal width is widened to 60 ns. The widened original pump signal is then sent to the merging module 512.

[0135] The signal generation module 511 receives the width of the modulated signal transmitted from the modulated signal width determination device 508, and the initial amplitude of the modulated signal transmitted from the modulated signal amplitude determination device 509. Based on these two parameters, it generates a modulated signal when the original pump signal modulation module 510 receives the original pump signal, and simultaneously sends the modulated signal to the merging module 512.

[0136] The merging module 512 subtracts the received modulated signal from the broadened original pump signal to generate the second pump signal.

[0137] The fiber laser 503 uses the second pump signal to drive the generation of pump light and generate a second laser signal.

[0138] This invention is not limited to the single connection method described above; appropriate equipment and connection methods can be selected according to specific applications and equipment requirements. In practical applications, some debugging and optimization may be necessary to ensure that the device operates normally and obtains the required pump signal characteristics.

[0139] This invention is not limited to the specific embodiments disclosed, and the division of aspects does not imply that features in these aspects cannot be combined for benefit; such division is merely for ease of description. This invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

[0140] This invention provides:

[0141] 1. A method for suppressing spike pulses in a fiber laser, comprising:

[0142] Generate the raw pump signal and obtain its amplitude and width;

[0143] Preset parameters are determined based on the first laser signal generated from the original pump signal;

[0144] The width and initial amplitude of the suppression signal used to suppress spike pulses in the first laser signal waveform are determined based on the preset parameters.

[0145] The original pump signal is modulated using the suppression signal to generate a second pump signal;

[0146] The second pump signal is used to drive the fiber laser to generate a second laser signal.

[0147] 2. According to the method described in item 1, the determination of the preset parameters based on the first laser signal generated from the original pump signal further includes the following steps:

[0148] The waveform of the first laser signal is acquired, and the amplitude of the spike pulse in the waveform of the first laser signal, the amplitude when the waveform of the first laser signal is stable, and the delay time relative to the original pump signal are detected.

[0149] The amplitude of the detected original pump signal, the amplitude when the first laser signal waveform is stable, the delay time, and the amplitude of the spike pulse are determined as the preset parameters.

[0150] 3. According to the method described in item 1, wherein determining the width and initial amplitude of the suppression signal for suppressing spike pulses based on the preset parameters further includes the following steps:

[0151] Calculate a first ratio between the amplitude of the first laser signal waveform when it is stable and the amplitude of the spike pulse; determine the initial amplitude of the suppression signal based on the first ratio and the amplitude of the original pump signal; or

[0152] Calculate a second ratio between the amplitude of the original pump signal and the amplitude of the spike pulse; determine the initial amplitude of the suppression signal based on the second ratio and the amplitude when the first laser signal waveform is stable; and

[0153] The delay time is determined as the width of the suppression signal.

[0154] 4. According to the method described in item 3, wherein determining the initial amplitude of the suppression signal based on the first ratio and the amplitude of the original pump signal further includes the following steps:

[0155] Multiplying the first ratio by the amplitude of the original pump signal determines the initial amplitude of the suppression signal; or

[0156] Determining the initial amplitude of the suppression signal based on the second ratio and the amplitude when the first laser signal waveform is stable further includes the following steps:

[0157] The starting amplitude of the suppression signal is determined by multiplying the second ratio by the amplitude when the waveform of the first laser signal is stable.

[0158] 5. The method according to item 1, wherein generating the second pump signal by modulating the original pump signal with the suppression signal further includes:

[0159] The suppression signal is then added to the leading edge of the original pump signal to generate the waveform of the second pump signal.

[0160] 6. The method according to item 5, wherein the waveform of the second pump signal generated by adding the suppression signal to the leading edge of the original pump signal further includes the following step:

[0161] The suppression signal rises from the initial amplitude to the amplitude of the original pump signal.

[0162] 7. The method according to any one of steps 1-6, wherein generating the second pump signal by modulating the original pump signal with the suppression signal further comprises:

[0163] The suppression signal is generated upon receiving the original pump signal;

[0164] The original pump signal is delayed by the width of the suppression signal;

[0165] The generated suppression signal is added to the delayed original pump signal to obtain the second pump signal.

[0166] 8. The method according to item 1, wherein generating the second pump signal by modulating the original pump signal with the suppression signal further includes:

[0167] The width of the suppressed signal is determined to be the width of the modulated signal;

[0168] The initial amplitude of the modulation signal is determined by subtracting the initial amplitude of the suppression signal from the amplitude of the original pump signal.

[0169] The modulation signal is generated upon receiving the original pump signal;

[0170] The original pump signal is subtracted from the modulation signal to generate the second pump signal.

[0171] 9. The method according to item 1, wherein generating the second pump signal by modulating the original pump signal with the suppression signal further includes:

[0172] The width of the suppressed signal is determined to be the width of the modulated signal;

[0173] The initial amplitude of the modulation signal is determined by subtracting the initial amplitude of the suppression signal from the amplitude of the original pump signal.

[0174] The width of the original pump signal is increased to the width of the suppression signal;

[0175] The second pump signal is generated by subtracting the broadened original pump signal from the modulation signal.

[0176] 10. An apparatus for suppressing spike pulses in a fiber laser, comprising:

[0177] The device includes a primary pump signal generator, a laser signal detection device, a secondary pump signal generator, a computing device, and a fiber laser.

[0178] The original pump signal generation device is used to generate an original pump signal, obtain the amplitude and width of the original pump signal, and feed it back to the computing device;

[0179] The laser signal detection device determines preset parameters based on the first laser signal generated by the original pump signal, and feeds back the preset parameters to the computing device;

[0180] The computing device determines the width and initial amplitude of the suppression signal used to suppress the spike pulse based on the preset parameters;

[0181] The second pump signal generating device modulates the original pump signal using the suppression signal to generate a second pump signal;

[0182] The fiber laser is driven by the second pump signal to generate pump light and thus generate a second laser signal.

[0183] 11. The device according to item 10, the laser signal detection device further includes:

[0184] The waveform of the first laser signal generated based on the original pump signal is obtained, and the amplitude of the spike pulse in the waveform of the first laser signal, the amplitude when the waveform of the first laser signal is stable, and the delay time relative to the original pump signal are detected.

[0185] The amplitude of the detected original pump signal, the amplitude when the first laser signal waveform is stable, the delay time, and the amplitude of the spike pulse are determined as the preset parameters.

[0186] 12. The device according to claim 10, the computing device further includes:

[0187] The suppression signal amplitude determination device is used for:

[0188] Calculate a first ratio between the amplitude of the first laser signal waveform when it is stable and the amplitude of the spike pulse; multiply the first ratio by the amplitude of the original pump signal to determine the starting amplitude of the suppression signal; and feed this ratio back to the second pump signal generation device; or

[0189] Calculate a second ratio between the amplitude of the original pump signal and the amplitude of the spike pulse; multiply this second ratio by the amplitude when the first laser signal waveform stabilizes to determine the initial amplitude of the suppression signal; and feed this ratio back to the second pump signal generation device.

[0190] A suppression signal width determining device is used to determine the delay time as the width of the suppression signal and feed it back to a second pump signal generating device.

[0191] 13. The device according to item 12, wherein the second pump signal generating device further includes a signal generating module, a raw pump signal modulation module, and a merging module;

[0192] The signal generation module generates a suppression signal upon receiving the original pump signal;

[0193] The original pump signal modulation module is used to delay the original pump signal;

[0194] The merging module is used to add the suppressed signal to the delayed original pump signal to generate the second pump signal.

[0195] 14. The device according to claim 13, wherein the original pump signal modulation module is used for

[0196] The original pump signal delays the width of the suppression signal.

[0197] 15. The device according to claim 12, the computing device further includes:

[0198] A modulation signal width determining device is used to determine the suppression signal width as the width of the modulation signal and feed it back to the second pump signal generating device;

[0199] The modulation signal amplitude determination device is used to determine the starting amplitude of the modulation signal by subtracting the starting amplitude of the original pump signal from the starting amplitude of the suppression signal, and then feeds it back to the second pump signal generation device.

[0200] 16. The device according to item 15, wherein the second pump signal generating device further includes a signal generating module and a merging module;

[0201] The signal generation module generates the modulation signal upon receiving the original pump signal;

[0202] The merging module is used to subtract the modulated signal from the original pump signal to generate the second pump signal.

[0203] 17. The apparatus according to claim 15, wherein the second pump signal generating device further includes an original pump signal modulation module for widening the width of the original pump signal to widen the width of the suppressed signal.

[0204] The merging module is used to subtract the modulated signal from the broadened original pump signal to generate the second pump signal.

Claims

1. A method for suppressing spike pulses in a fiber laser, comprising: Generate the raw pump signal and obtain its amplitude and width; The preset parameters are determined based on the first laser signal generated from the original pump signal; The width and initial amplitude of the suppression signal used to suppress spike pulses in the first laser signal waveform are determined based on preset parameters. The final amplitude of the suppression signal is greater than the initial amplitude but less than the amplitude of the original pump signal. A suppression signal is generated upon receiving the original pump signal; The original pump signal is modulated using a suppression signal to generate a second pump signal, which includes: The original pump signal is delayed to suppress the signal width; The generated suppression signal is added to the delayed original pump signal to generate a second pump signal, wherein the initial amplitude of the second pump signal is smaller than that of the original pump signal and greater than 0; A second pump signal is used to drive a fiber laser to generate a second laser signal in order to suppress the spike pulses in the generated laser signal waveform; The process of determining the preset parameters based on the first laser signal generated from the original pump signal also includes the following steps: The waveform of the first laser signal is acquired, and the amplitude of the spike pulse in the waveform of the first laser signal, the amplitude when the waveform of the first laser signal is stable, and the delay time relative to the original pump signal are detected. The amplitude of the detected original pump signal, the amplitude of the first laser signal waveform when it is stable, the delay time, and the amplitude of the spike pulse are determined as preset parameters. The process of determining the width and initial amplitude of the suppression signal used to suppress spike pulses based on preset parameters also includes the following steps: Calculate the first ratio between the amplitude of the first laser signal waveform when it is stable and the amplitude of the spike pulse; determine the initial amplitude of the suppression signal based on the first ratio and the amplitude of the original pump signal; or Calculate a second ratio between the amplitude of the original pump signal and the amplitude of the spike pulse; based on this second ratio and the amplitude of the first laser signal waveform when it is stable, determine the initial amplitude of the suppression signal; and The delay time is determined as the width of the suppressed signal.

2. The method of claim 1, wherein determining the initial amplitude of the suppression signal based on the first ratio and the amplitude of the original pump signal further comprises the following steps: Multiply the first ratio by the amplitude of the original pump signal to determine the initial amplitude of the suppression signal; or Determining the initial amplitude of the suppression signal based on the second ratio and the amplitude when the first laser signal waveform is stable also includes the following steps: The initial amplitude of the suppression signal is determined by multiplying the second ratio by the amplitude when the first laser signal waveform is stable.

3. The method of claim 1, wherein generating the second pump signal by modulating the original pump signal with the suppression signal further comprises: Then, a suppression signal is added to the leading edge of the original pump signal to generate the waveform of the second pump signal.

4. The method of claim 3, wherein immediately following the addition of a suppression signal to the leading edge of the original pump signal to generate the waveform of the second pump signal, the method further comprises the following steps: The suppression signal rises from the initial amplitude to the amplitude of the original pump signal.

5. The method as described in claim 1, characterized in that, The determination of the width and initial amplitude of the suppression signal used to suppress spike pulses in the first laser signal waveform based on preset parameters also includes: Estimate the width and initial amplitude of the suppressed waveform; The estimated value is input into the waveform function generator to directly generate the waveform of the second pump signal with the suppressed signal; The fiber laser is driven to generate a laser signal using a second pump signal. Continuously change the width and initial amplitude of the suppressed waveform input to the function signal generator, and observe the relative position and suppression of the spike pulse and square wave in the laser signal waveform output by the fiber laser. The process stops only when the laser signal output by the fiber laser is observed to be consistent with the second laser signal mentioned earlier. At this point, the values ​​recorded in the function signal generator are the determined values ​​of the required suppressed waveform width and the initial amplitude.

6. The method of claim 5, wherein during the observation process, If the spike pulse of the laser signal generated by the fiber laser appears before the rising edge of the square wave, the width of the suppression signal is gradually increased. If the spike pulse of the laser signal generated by the fiber laser lags behind the rising edge of the square wave, the width of the suppressed waveform is reduced.

7. The method of claim 5, wherein during the observation process, If the amplitude of the spike pulse is higher than that of the square wave, then reduce the initial amplitude of the suppressed waveform.

8. A method for suppressing spike pulses in a fiber laser, comprising: Generate the raw pump signal and obtain its amplitude and width; The preset parameters are determined based on the first laser signal generated from the original pump signal; The width and initial amplitude of the suppression signal used to suppress spike pulses in the first laser signal waveform are determined based on preset parameters. The final amplitude of the suppression signal is greater than the initial amplitude but less than the amplitude of the original pump signal. A suppression signal is generated upon receiving the original pump signal; The width of the suppressed signal is determined to be the width of the modulated signal; The initial amplitude of the modulation signal is determined by subtracting the initial amplitude of the suppression signal from the amplitude of the original pump signal. A modulated signal is generated upon receiving the original pump signal; The original pump signal is subtracted from the modulation signal to generate a second pump signal, wherein the initial amplitude of the second pump signal is less than that of the original pump signal and greater than 0; A second pump signal is used to drive a fiber laser to generate a second laser signal in order to suppress the spike pulses in the generated laser signal waveform; Determining the preset parameters based on the first laser signal generated from the original pump signal also includes the following steps: The waveform of the first laser signal is acquired, and the amplitude of the spike pulse in the waveform of the first laser signal, the amplitude when the waveform of the first laser signal is stable, and the delay time relative to the original pump signal are detected. The amplitude of the detected original pump signal, the amplitude of the first laser signal waveform when it is stable, the delay time, and the amplitude of the spike pulse are determined as preset parameters. The process of determining the width and initial amplitude of the suppression signal used to suppress spike pulses based on preset parameters also includes the following steps: Calculate the first ratio between the amplitude of the first laser signal waveform when it is stable and the amplitude of the spike pulse; determine the initial amplitude of the suppression signal based on the first ratio and the amplitude of the original pump signal; or Calculate the second ratio between the amplitude of the original pump signal and the amplitude of the spike pulse, and determine the initial amplitude of the suppression signal based on the second ratio and the amplitude when the first laser signal waveform is stable; as well as The delay time is determined as the width of the suppressed signal.

9. A method for suppressing spike pulses in a fiber laser, comprising: Generate the raw pump signal and obtain its amplitude and width; The preset parameters are determined based on the first laser signal generated from the original pump signal; The width and initial amplitude of the suppression signal used to suppress spike pulses in the first laser signal waveform are determined based on preset parameters. The final amplitude of the suppression signal is greater than the initial amplitude but less than the amplitude of the original pump signal. A suppression signal is generated upon receiving the original pump signal; The width of the suppressed signal is determined to be the width of the modulated signal; The initial amplitude of the modulation signal is determined by subtracting the initial amplitude of the suppression signal from the amplitude of the original pump signal. The width of the original pump signal is widened to suppress the width of the signal; The broadened original pump signal is subtracted from the modulation signal to generate a second pump signal, wherein the initial amplitude of the second pump signal is smaller than that of the original pump signal and greater than 0; A second pump signal is used to drive a fiber laser to generate a second laser signal in order to suppress the spike pulses in the generated laser signal waveform; Determining the preset parameters based on the first laser signal generated from the original pump signal also includes the following steps: The waveform of the first laser signal is acquired, and the amplitude of the spike pulse in the waveform of the first laser signal, the amplitude when the waveform of the first laser signal is stable, and the delay time relative to the original pump signal are detected. The amplitude of the detected original pump signal, the amplitude of the first laser signal waveform when it is stable, the delay time, and the amplitude of the spike pulse are determined as preset parameters. The process of determining the width and initial amplitude of the suppression signal used to suppress spike pulses based on preset parameters also includes the following steps: Calculate the first ratio between the amplitude of the first laser signal waveform when it is stable and the amplitude of the spike pulse; determine the initial amplitude of the suppression signal based on the first ratio and the amplitude of the original pump signal; or Calculate the second ratio between the amplitude of the original pump signal and the amplitude of the spike pulse, and determine the initial amplitude of the suppression signal based on the second ratio and the amplitude when the first laser signal waveform is stable; as well as The delay time is determined as the width of the suppressed signal.

10. An apparatus for suppressing spike pulses in a fiber laser, comprising: The device includes a primary pump signal generator, a laser signal detection device, a secondary pump signal generator, a computing device, and a fiber laser. The raw pump signal generation device is used to generate the raw pump signal, obtain the amplitude and width of the raw pump signal, and feed it back to the computing device; The laser signal detection device determines preset parameters based on the first laser signal generated by the original pump signal and feeds the preset parameters back to the computing device. The computing device determines the width and initial amplitude of the suppression signal used to suppress spike pulses based on preset parameters, wherein the final amplitude of the suppression signal is greater than the initial amplitude but less than the amplitude of the original pump signal; The second pump signal generating device modulates the original pump signal with a suppression signal to generate a second pump signal, wherein the initial amplitude of the second pump signal is smaller than that of the original pump signal and greater than 0; The fiber laser uses a second pump signal to drive the generation of pump light to generate a second laser signal, thereby suppressing the spike pulses in the generated laser signal waveform; The second pump signal generation device also includes a signal generation module, a raw pump signal modulation module, and a merging module; The signal generation module generates a suppression signal upon receiving the original pump signal; The raw pump signal modulation module is used to delay the raw pump signal; The merging module is used to add the suppressed signal to the delayed original pump signal to generate a second pump signal; The laser signal detection device also includes: The waveform of the first laser signal generated based on the original pump signal is obtained, and the amplitude of the spike pulse in the waveform of the first laser signal, the amplitude when the waveform of the first laser signal is stable, and the delay time relative to the original pump signal are detected. The amplitude of the detected original pump signal, the amplitude of the first laser signal waveform when it is stable, the delay time, and the amplitude of the spike pulse are determined as preset parameters. The computing device also includes: The suppression signal amplitude determination device is used for: Calculate the first ratio between the amplitude of the first laser signal waveform when it is stable and the amplitude of the spike pulse. Multiply this first ratio by the amplitude of the original pump signal to determine the initial amplitude of the suppression signal, and feed it back to the second pump signal generation device; or The second ratio between the amplitude of the original pump signal and the amplitude of the spike pulse is calculated. This second ratio is multiplied by the amplitude of the first laser signal waveform when it stabilizes to determine the initial amplitude of the suppression signal, and this value is fed back to the second pump signal generation device. The suppression signal width determination device is used to determine the delay time as the width of the suppression signal and feed it back to the second pump signal generation device.

11. The device of claim 10, wherein the original pump signal modulation module is used to delay the width of the original pump signal to suppress the signal.

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