CN114389140A - System and method for inhibiting waveform distortion of hundred-nanosecond laser pulse - Google Patents

System and method for inhibiting waveform distortion of hundred-nanosecond laser pulse Download PDF

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CN114389140A
CN114389140A CN202011116711.7A CN202011116711A CN114389140A CN 114389140 A CN114389140 A CN 114389140A CN 202011116711 A CN202011116711 A CN 202011116711A CN 114389140 A CN114389140 A CN 114389140A
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signal
beam splitter
output end
output
laser
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吴洋
邢美术
林兆培
丁亚茜
戚伟
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Shanghai Transmission Line Research Institute No 23 Research Institute Of China Electronics Technology Group Corp
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Shanghai Transmission Line Research Institute No 23 Research Institute Of China Electronics Technology Group Corp
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • H01S3/0085—Modulating the output, i.e. the laser beam is modulated outside the laser cavity
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
    • H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
    • H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
    • H01S3/1305—Feedback control systems

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  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Optics & Photonics (AREA)
  • Automation & Control Theory (AREA)
  • Lasers (AREA)

Abstract

The invention relates to the technical field of laser, in particular to a system and a method for inhibiting waveform distortion of hundred-nanosecond laser pulses, wherein a trigger signal is set as a square wave to amplify the laser, the pulse waveform of the amplified output laser is observed, and the output waveform is pre-compensated through tracing points by using an arbitrary waveform generator according to the sharpening degree of the output pulse laser; the acousto-optic modulator is simultaneously connected with the light source, pulse laser with corresponding waveform is obtained after a point-tracing trigger signal of the arbitrary waveform generator is received, and finally near-flat-top pulse output after laser amplification is realized. The invention not only solves the problem of sharpening the leading edge of the pulse waveform of the pulse laser in the amplification process, reduces the peak power of the pulse laser, inhibits the optical nonlinear effect of stimulated Brillouin scattering, but also limits the narrowing of the laser pulse width.

Description

System and method for inhibiting waveform distortion of hundred-nanosecond laser pulse
Technical Field
The invention relates to the technical field of laser, in particular to a system and a method for inhibiting waveform distortion of hundred-nanosecond laser pulses.
Background
At present, two methods are mainly adopted for solving the problem of waveform distortion caused by uneven gain in the amplification process of pulse laser: firstly, the self gain flatness of the amplifier is optimally designed, and the gain unevenness of the amplifier is improved by changing the type or doping of the optical fiber substrate; and secondly, a gain flattening technology is introduced, and the gain flattening technology can be divided into a static gain flattening filter and a dynamic gain equalizer. The problem of uneven gain is fundamentally solved by changing the type or doping of the optical fiber matrix, and the optical fiber matrix has good reliability, but is only suitable for a small-range fixed waveband; the static gain flattening filter is simple and easy to implement, has low insertion loss, and intelligently achieves flattening of a static gain spectrum like the first method, and is seriously lack of flexibility; the dynamic gain balancing technology comprises various methods such as an all-fiber acousto-optic tunable filter, cascade liquid crystal optical harmonic balancing, holographic polymer liquid crystal grating and the like, can realize real-time tuning of multi-channel gain through a corresponding control algorithm, has high degree of intellectualization, but is too high in cost and is not suitable for part of small and medium-sized products.
Therefore, a method is needed to be found, which can solve the problem of sharpening the leading edge of a pulse waveform of the pulse laser in the amplification process, reduce the peak power of the pulse laser, inhibit the optical nonlinear effect of stimulated brillouin scattering, limit the narrowing of the laser pulse width, change parameters in real time, and has the advantages of simple operation and low cost.
Disclosure of Invention
The invention aims to provide a hundred-nanosecond laser pulse waveform distortion suppression system and a method, which can solve the waveform distortion generated in the amplification process of pulse laser and have the advantages of automation, visualization and high adaptability, and the specific scheme is as follows:
a suppression system of hundred nanosecond level laser pulse waveform distortion is characterized in that: the system comprises a continuous laser light source, an arbitrary waveform generator, an acousto-optic modulator, a first beam splitter, an amplifier, a second beam splitter, a photoelectric converter, a self-adaptive equalizer and an oscilloscope; the input end of the acousto-optic modulator is connected with the output end of the arbitrary waveform generator, the other input end of the acousto-optic modulator is connected with the continuous laser light source, the first beam splitter is connected with the output end of the acousto-optic modulator, the first output end of the first beam splitter is connected to the first input end of the adaptive equalizer, the second output end of the first beam splitter is connected to the amplifier, the output end of the amplifier is connected with the second beam splitter, the first output end of the second beam splitter is connected with the photoelectric converter, the second output end of the second beam splitter is connected to the oscilloscope, the photoelectric converter is connected with the second input end of the adaptive equalizer, and the output end of the adaptive equalizer is connected with the input end of the arbitrary waveform generator.
Further, the ratio of the output energy of the first output end of the first beam splitter to the output energy of the second output end of the first beam splitter is 1:99, the ratio of the output energy of the first output end of the second beam splitter to the output energy of the second output end of the second beam splitter is 1: 999.
Further, the continuous laser light source is used for modulating the output continuous laser light into pulse laser light.
Further, the arbitrary waveform generator is configured to set the trigger signal to a square wave.
Further, the adaptive equalizer is used for sampling a signal transmitted by the first output end of the first beam splitter through an AD sampling circuit, and taking an average value of voltage values which are higher than 90% of the sampled signal as a top voltage.
Further, the adaptive equalizer is also used for sampling the feedback signal of the photoelectric converter through an AD sampling circuit.
Further, the adaptive equalizer is further configured to send the pre-compensation trigger signal obtained by calculation to the arbitrary waveform generator to form a closed-loop feedback, and compensate the distortion signal by the pre-compensation signal.
A suppression method of a suppression system based on the hundred-nanosecond laser pulse waveform distortion is characterized by comprising the following steps:
step 1, setting a trigger signal into a square wave through the arbitrary waveform generator;
step 2: modulating continuous laser output by the continuous laser light source into pulse laser;
and step 3: the self-adaptive equalizer samples a signal transmitted by the first output end of the first beam splitter through an AD sampling circuit, and the average value of voltage values which are higher than the sampling signal by 90% is used as top voltage;
and 4, step 4: the self-adaptive equalizer samples a feedback signal of the photoelectric converter through an AD sampling circuit, a rising edge and a falling edge are screened out from the sampling signal, and the residual top signal is a distortion part of the feedback signal;
and 5: fitting the distorted part, and performing inverse operation by combining a signal output by an output end I of the beam splitter to calculate a pre-compensation signal waveform;
step 6, the self-adaptive equalizer sends the pre-compensation trigger signal obtained by calculation to an arbitrary waveform generator to form closed loop feedback, and the distortion signal is compensated through the pre-compensation signal;
and 7, repeating the steps 3 to 6 by the self-adaptive equalizer, and pre-compensating the initial pulse amplification signal through closed-loop feedback until the top of the final output signal waveform is flat.
The hundred nanosecond light pulse waveform distortion suppression system and the method have the advantages that:
1. by sampling and inverse operation of the split signals, the problem of sharpening the leading edge of the pulse waveform of the pulse laser in the amplification process is solved, the peak power of the pulse laser is reduced, the optical nonlinear effect of stimulated Brillouin scattering is inhibited,
2. by reducing the peak power of the pulsed laser, narrowing of the laser pulse width is limited.
3. Through the feedback closed-loop design, the method has the advantages of automation, visualization, strong adaptability and the like.
Drawings
The present invention will be described in further detail with reference to the following drawings and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is an output waveform when the pulse width is 300ns square wave;
FIG. 3 is a pre-compensated trigger signal with a pulse width of 300ns
FIG. 4 is a pre-compensated output waveform with a pulse width of 300 ns;
FIG. 5 is an output waveform when a square wave with a pulse width of 500 ns;
FIG. 6 is a pre-compensated trigger signal with a pulse width of 500 ns;
FIG. 7 is a pre-compensated output waveform with a pulse width of 500 ns;
FIG. 8 is an output waveform triggered with a square wave having a pulse width of 800 ns;
FIG. 9 is a pre-compensated trigger signal with a pulse width of 800 ns;
fig. 10 is a pre-compensated output waveform with a pulse width of 800 ns.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1:
in this embodiment, as shown in fig. 1, the acousto-optic modulator is connected to an arbitrary waveform generator, another input end of the acousto-optic modulator is connected to the continuous laser light source, and the acousto-optic modulator subsequently adjusts the trigger signal according to a subsequent feedback signal and pre-compensates an output waveform. The first beam splitter receives the output pulse laser of the acousto-optic modulator, the first beam splitter connects the first output end to the adaptive equalizer, and the second output end is connected to the amplifier. The amplifier amplifies the pulse laser, and the output end of the amplifier is connected with the second beam splitter. The second beam splitter receives the amplified signal and connects the first output end with the photoelectric converter, the second output end is connected to the oscilloscope, and the photoelectric converter converts the signal light at the first output end into an electric signal and is connected with the second input end of the adaptive equalizer. And the output end of the self-adaptive equalizer is connected with the arbitrary waveform generator.
In the above system, the ratio of the output energy of the first output end and the second output end of the first beam splitter is 1:99, the ratio of the output energy of the first output end of the second beam splitter to the output energy of the second output end of the second beam splitter is 1: 999.
The suppression method using the system of the embodiment comprises the following steps:
the present embodiment is a square wave signal with an automatic adjustment repetition frequency of 10kHz and a pulse width of 300ns
Setting a trigger signal to be a square wave signal with the repetition frequency of 10kHz and the pulse width of 300ns by the arbitrary waveform generator, and inputting the square wave signal into the acousto-optic modulator;
the acousto-optic modulator is connected with the continuous laser light source in parallel and modulates the continuous laser output by the continuous laser light source into pulse laser;
sending a signal with 1% energy to the adaptive equalizer through the first beam splitter to serve as an expected signal, and outputting a signal with residual energy to the amplifier;
the amplifier amplifies the 99% energy signal sent by the first beam splitter;
after the pulse laser is amplified by the amplifier, a signal with 0.1% energy is fed back to the photoelectric converter through the second beam splitter, and the waveform of the initial amplified signal is shown in fig. 2;
the photoelectric converter converts the optical signal into an electric signal and feeds the electric signal back to the adaptive equalizer;
the self-adaptive equalizer firstly samples the signal with 1% energy transmitted by the first beam splitter through an AD sampling circuit, and processes the value obtained by sampling. The desired signal is a flat-topped pulse signal, the sampled signal has values in the interval [0,0.62], and the average of 90% higher values than the sampled signal is taken as the top value, 0.61.
And secondly, sampling the feedback signal of the photoelectric converter by an AD sampling circuit, wherein after the rising edge 18ns and the falling edge 21ns of the sampling signal are removed, the residual top signal is the distortion part of the feedback signal. Fitting the distorted part of the feedback signaly1Is a fitting formula of
y1＝y1i+A1*exp(-xt1)
Wherein y is1iIs the first value (subsequently denoted as the initial non-zero voltage) after the rising edge signal of the signal, A1Is the difference between the maximum voltage and the initial non-zero voltage, x is the pulse width, t1Is the rate of increase of waveform distortion. After fitting, y1i＝5.04，A1＝3.67，x＝251，t1＝9.17×106。
After the distorted signal is fitted, the desired signal is combined to perform inverse operation so that y is equal to y1*y2Calculating the pre-compensation signal waveform y2，y2Can be expressed as
y2＝y2i+A2*exp(xt2)
Wherein y is2iIs an initial non-zero voltage of the signal, A2Is the difference between the maximum voltage and the initial non-zero voltage, x is the pulse width, t2To pre-compensate for the rate of increase of the trigger signal. After fitting, y2i＝1.68，A2＝0.07，x＝300，t2＝7.02×106。
As shown in fig. 3, finally, the adaptive equalizer sends the calculated pre-compensation trigger signal to an arbitrary waveform generator to form a closed-loop feedback, and the distortion signal is compensated by the pre-compensation signal.
The final output waveform was observed by an oscilloscope to determine that the final output signal waveform was flat on top. The initial pulse amplification signal generates waveform distortion in the initial stage due to transient effect, and the top of the signal is an exponential decay type waveform with the finite decreasing front-high back-low. Waiting for the adaptive equalizer to repeat the above operations, and pre-compensating the initial pulse amplification signal through closed-loop feedback until the top of the final output signal waveform is flat, as shown in fig. 4.
Example 2:
in this embodiment, as shown in fig. 1, the acousto-optic modulator is connected to an arbitrary waveform generator, another input end of the acousto-optic modulator is connected to the continuous laser light source, and the acousto-optic modulator subsequently adjusts the trigger signal according to a subsequent feedback signal and pre-compensates an output waveform. The first beam splitter receives the output pulse laser of the acousto-optic modulator, the first beam splitter connects the first output end to the adaptive equalizer, and the second output end is connected to the amplifier. The amplifier amplifies the pulse laser, and the output end of the amplifier is connected with the second beam splitter. The second beam splitter receives the amplified signal and connects the first output end with the photoelectric converter, the second output end is connected to the oscilloscope, and the photoelectric converter converts the signal light at the first output end into an electric signal and is connected with the second input end of the adaptive equalizer. And the output end of the self-adaptive equalizer is connected with the arbitrary waveform generator.
In the system, the ratio of the output energy of the first output end of the first beam splitter to the output energy of the second output end of the second beam splitter is 1:99, and the ratio of the output energy of the first output end of the second beam splitter to the output energy of the second output end of the second beam splitter is 1: 999.
The suppression method using the system of the embodiment comprises the following steps:
the present embodiment is a square wave signal with an automatic adjustment repetition frequency of 10kHz and a pulse width of 500ns
Setting a trigger signal to be a square wave signal with the repetition frequency of 10kHz and the pulse width of 500ns by the arbitrary waveform generator, and inputting the square wave signal into the acousto-optic modulator;
the acousto-optic modulator is connected with the continuous laser light source in parallel and modulates the continuous laser output by the continuous laser light source into pulse laser;
sending a signal with 1% energy to the adaptive equalizer through the first beam splitter to serve as an expected signal, and outputting a signal with residual energy to the amplifier;
the amplifier amplifies the 99% energy signal sent by the first beam splitter;
after the pulse laser is amplified by the amplifier, a signal with 0.1% energy is fed back to the photoelectric converter through the second beam splitter, and the waveform of the initial amplified signal is shown in fig. 5;
the photoelectric converter converts the optical signal into an electric signal and feeds the electric signal back to the adaptive equalizer;
the self-adaptive equalizer firstly samples the signal with 1% energy transmitted by the first beam splitter through an AD sampling circuit, and processes the value obtained by sampling. The desired signal is a flat-topped pulse signal, the sampled signal has a value interval of [ 00.61 ], and the top value is 0.59, taking the average of 90% higher values than the sampled signal.
And secondly, sampling the feedback signal of the photoelectric converter by an AD sampling circuit, wherein after the rising edge 22ns and the falling edge 26ns of the sampling signal are removed, the residual top signal is the distortion part of the feedback signal. Fitting the distorted part, the distorted part y of the feedback signal1Is a fitting formula of
y1＝y1i+A1*exp(-xt1)
Wherein y is1iIs the first value (subsequently denoted as the initial non-zero voltage) after the rising edge signal of the signal, A1Is the difference between the maximum voltage and the initial non-zero voltage, x is the pulse width, t1Is the rate of increase of waveform distortion. After fitting, y1i＝2.98，A1＝2.87，x＝462，t1＝5.52×106。
After the distorted signal is fitted, the desired signal is combined to perform inverse operation so that y is equal to y1*y2Calculating the pre-compensation signal waveform y2，y2Can be expressed as
y2＝y2i+A2*exp(xt2)
Wherein y is2iIs an initial non-zero voltage of the signal, A2Is the difference between the maximum voltage and the initial non-zero voltage, x is the pulse width, t2To pre-compensate for the rate of increase of the trigger signal. After fitting, y2i＝3.85，A2＝4.25，x＝500，t2＝6.64×106。
As shown in fig. 6, finally, the adaptive equalizer sends the calculated pre-compensation trigger signal to an arbitrary waveform generator to form a closed-loop feedback, and the distortion signal is compensated by the pre-compensation signal.
The final output waveform was observed by an oscilloscope to determine that the final output signal waveform was flat on top. The initial pulse amplification signal generates waveform distortion in the initial stage due to transient effect, and the top of the signal is an exponential decay type waveform with the finite decreasing front-high back-low. And waiting for the self-adaptive equalizer to repeat the work, and pre-compensating the initial pulse amplification signal through closed-loop feedback until the top of the final output signal waveform is flat. As shown in fig. 7, the top of the final output signal waveform is flat as shown in fig. 7.
Example 3:
in this embodiment, as shown in fig. 1, the acousto-optic modulator is connected to an arbitrary waveform generator, another input end of the acousto-optic modulator is connected to the continuous laser light source, and the acousto-optic modulator subsequently adjusts the trigger signal according to a subsequent feedback signal and pre-compensates an output waveform. The first beam splitter receives the output pulse laser of the acousto-optic modulator, the first beam splitter connects the first output end to the adaptive equalizer, and the second output end is connected to the amplifier. The amplifier amplifies the pulse laser, and the output end of the amplifier is connected with the second beam splitter. The second beam splitter receives the amplified signal and connects the first output end with the photoelectric converter, the second output end is connected to the oscilloscope, and the photoelectric converter converts the signal light at the first output end into an electric signal and is connected with the second input end of the adaptive equalizer. And the output end of the self-adaptive equalizer is connected with the arbitrary waveform generator.
In the above system, the ratio of the output energy of the first output end and the second output end of the first beam splitter is 1:99, the ratio of the output energy of the first output end of the second beam splitter to the output energy of the second output end of the second beam splitter is 1: 999.
The suppression method using the system of the embodiment comprises the following steps:
the present embodiment is a square wave signal with an automatic adjustment repetition frequency of 10kHz and a pulse width of 800ns
Setting a trigger signal to be a square wave signal with the repetition frequency of 10kHz and the pulse width of 800ns by the arbitrary waveform generator, and inputting the square wave signal into the acousto-optic modulator;
the acousto-optic modulator is connected with the continuous laser light source in parallel and modulates the continuous laser output by the continuous laser light source into pulse laser;
sending a signal with 1% energy to the adaptive equalizer through the first beam splitter to serve as an expected signal, and outputting a signal with residual energy to the amplifier;
the amplifier amplifies the 99% energy signal sent by the first beam splitter;
after the pulse laser is amplified by the amplifier, a signal with 0.1% energy is fed back to the photoelectric converter through the second beam splitter, and the waveform of the initial amplified signal is shown in fig. 8;
the photoelectric converter converts the optical signal into an electric signal and feeds the electric signal back to the adaptive equalizer;
the self-adaptive equalizer firstly samples the signal with 1% energy transmitted by the first beam splitter through an AD sampling circuit, and processes the value obtained by sampling. The desired signal is a flat-topped pulse signal, the sampled signal has a value interval of [ 00.58 ], and the top value is 0.57 with the average of 90% higher values than the sampled signal.
And secondly, sampling the feedback signal of the photoelectric converter by an AD sampling circuit, and removing the rising edge 20ns and the falling edge 28ns of the sampling signal to obtain the residual top signal which is the distorted part of the feedback signal. Fitting the distorted part, the distorted part y of the feedback signal1Is a fitting formula of
y1＝y1i+A1*exp(-xt1)
Wherein y is1iIs the first value (subsequently denoted as the initial non-zero voltage) after the rising edge signal of the signal, A1Is the difference between the maximum voltage and the initial non-zero voltage, x is the pulse width, t1Is the rate of increase of waveform distortion. After fitting, y1i＝3.69，A1＝29.79，x＝752，t1＝1.05×107。
After the distorted signal is fitted, the desired signal is combined to perform inverse operation so that y is equal to y1*y2Calculating the pre-compensation signal waveform y2，y2Can be expressed as
y2＝y2i+A2*exp(xt2)
Wherein y is2iIs an initial non-zero voltage of the signal, A2Is the difference between the maximum voltage and the initial non-zero voltage, x is the pulse width, t2To pre-compensate for the rate of increase of the trigger signal. After fitting, y2i＝3.51，A2＝3.36，x＝800，t2＝6.09×106。
As shown in fig. 9, finally, the adaptive equalizer sends the calculated pre-compensation trigger signal to an arbitrary waveform generator to form a closed-loop feedback, and the distortion signal is compensated by the pre-compensation signal.
The final output waveform was observed by an oscilloscope to determine that the final output signal waveform was flat on top. The initial pulse amplification signal generates waveform distortion in the initial stage due to transient effect, and the top of the signal is an exponential decay type waveform with the finite decreasing front-high back-low. It is necessary to wait for the adaptive equalizer to repeat the above operations, and pre-compensate the initial pulse amplification signal through closed-loop feedback until the top of the final output signal waveform is flat, as shown in fig. 10.
The present invention is not limited to the above embodiments, and those skilled in the art can implement the present invention in other various embodiments according to the present disclosure, since the scope of the present invention is defined by the appended claims.

Claims (8)

1. A suppression system of hundred nanosecond level laser pulse waveform distortion is characterized in that: the system comprises a continuous laser light source, an arbitrary waveform generator, an acousto-optic modulator, a first beam splitter, an amplifier, a second beam splitter, a photoelectric converter, a self-adaptive equalizer and an oscilloscope;
the input end of the acousto-optic modulator is connected with the output end of the arbitrary waveform generator, the other input end of the acousto-optic modulator is connected with the continuous laser light source, the first beam splitter is connected with the output end of the acousto-optic modulator, the first output end of the first beam splitter is connected to the first input end of the adaptive equalizer, the second output end of the first beam splitter is connected to the amplifier, the output end of the amplifier is connected with the second beam splitter, the first output end of the second beam splitter is connected with the photoelectric converter, the second output end of the second beam splitter is connected to the oscilloscope, the photoelectric converter is connected with the second input end of the adaptive equalizer, and the output end of the adaptive equalizer is connected with the input end of the arbitrary waveform generator.
2. The system for suppressing waveform distortion of laser pulses in hundred nanoseconds according to claim 1, wherein: the output energy ratio of the first output end of the first beam splitter to the second output end of the first beam splitter is 1:99, the ratio of the output energy of the first output end of the second beam splitter to the output energy of the second output end of the second beam splitter is 1: 999.
3. The system for suppressing waveform distortion of laser pulses in hundred nanoseconds according to claim 1, wherein: the continuous laser light source is used for modulating the output continuous laser light into pulse laser light.
4. The system for suppressing waveform distortion of laser pulses in hundred nanoseconds according to claim 1, wherein: the arbitrary waveform generator is used for setting the trigger signal into square wave.
5. The system for suppressing waveform distortion of laser pulses in hundred nanoseconds according to claim 1, wherein: the self-adaptive equalizer is used for sampling a signal transmitted by the first output end of the first beam splitter through an AD sampling circuit, and taking the average value of voltage values which are higher than the sampling signal by 90% as top voltage.
6. The system for suppressing waveform distortion of laser pulses in hundred nanoseconds according to claim 5, wherein: the adaptive equalizer is also used for sampling a feedback signal of the photoelectric converter through an AD sampling circuit.
7. The system for suppressing waveform distortion of laser pulses in hundred nanoseconds according to claim 6, wherein: the self-adaptive equalizer is further used for sending the pre-compensation trigger signal obtained through calculation to the arbitrary waveform generator to form closed-loop feedback, and the distortion signal is compensated through the pre-compensation signal.
8. A method for suppressing the waveform distortion of a laser pulse according to any one of claims 1 to 7, wherein:
step 1, setting a trigger signal into a square wave through the arbitrary waveform generator;
step 2: modulating continuous laser output by the continuous laser light source into pulse laser;
and step 3: the self-adaptive equalizer samples a signal transmitted by the first output end of the first beam splitter through an AD sampling circuit, and the average value of voltage values which are higher than the sampling signal by 90% is used as top voltage;
and 4, step 4: the self-adaptive equalizer samples a feedback signal of the photoelectric converter through an AD sampling circuit, a rising edge and a falling edge are screened out from the sampling signal, and the residual top signal is a distortion part of the feedback signal;
and 5: fitting the distorted part, and performing inverse operation by combining a signal output by an output end I of the beam splitter to calculate a pre-compensation signal waveform;
step 6, the self-adaptive equalizer sends the pre-compensation trigger signal obtained by calculation to an arbitrary waveform generator to form closed loop feedback, and the distortion signal is compensated through the pre-compensation signal;
and 7, repeating the steps 3 to 6 by the self-adaptive equalizer, and pre-compensating the initial pulse amplification signal through closed-loop feedback until the top of the final output signal waveform is flat.
CN202011116711.7A 2020-10-19 2020-10-19 System and method for inhibiting waveform distortion of hundred-nanosecond laser pulse Pending CN114389140A (en)

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