A pulse compression modulation method and system for ultraviolet laser

Abstract

The present invention relates to the field of laser pulse modulation technology, and in particular to a pulse compression modulation method and system for ultraviolet lasers, the method comprising the following steps: obtaining an ultraviolet laser pulse signal; compressing the pulse time width of the ultraviolet laser pulse signal based on an optical crystal array, thereby obtaining a short and wide laser pulse signal; performing probe pulse superposition processing on the short and wide laser pulse signal, and performing grating time domain projection imaging, thereby obtaining pulse time domain spectrum imaging; generating the time orientation of different frequency components based on pulse time domain spectrum imaging; performing micro-frequency shift photon identification based on the time orientation of different frequency components, and performing original photon flux change analysis to generate offset photon flux change parameters; performing dynamic calibration tuning simulation on the offset photon flux change parameters, thereby generating an optimally tuned compressed pulse. The present invention realizes efficient and accurate laser pulse compression modulation.

Description

Technical Field

[0001] The invention relates to the technical field of laser pulse modulation, and in particular to a pulse compression modulation method and system for an ultraviolet laser. Background Art

[0002] As an important light source that can generate high-energy, short-pulse optical pulses, ultraviolet lasers are widely used in material processing, biomedicine, lidar and other fields. However, traditional ultraviolet laser pulse compression technology often relies on linear optical effects, and has defects such as low pulse peak power and limited modulation depth, which cannot meet the high standards of current precision application scenarios. With the rapid development of nonlinear optical technology, it has become possible to use nonlinear optical effects to efficiently compress and precisely modulate ultraviolet laser pulses. Through cascaded frequency conversion, phase modulation, dispersion compensation and other nonlinear processes, the time width, peak power and spectral characteristics of the pulse can be greatly improved, which provides a new technical path for realizing high-frequency, low-width pulse compression modulation of ultraviolet lasers. However, since ultraviolet light is easily affected by factors such as dispersion and nonlinear distortion during transmission and operation, intelligent analysis and control methods are needed to ensure the accuracy and stability of pulse compression modulation. Summary of the invention

[0003] In order to solve the above technical problems, the present invention proposes a pulse compression modulation method and system for an ultraviolet laser to solve at least one of the above technical problems.

[0004] To achieve the above object, the present invention provides a pulse compression modulation method for an ultraviolet laser, characterized in that the ultraviolet laser internally includes an optical crystal array, a grating and a dispersion compensation device; and comprises the following steps:

[0005] Step S1: obtaining an ultraviolet laser pulse signal; compressing the pulse time width of the ultraviolet laser pulse signal based on an optical crystal array, thereby obtaining a short and wide laser pulse signal;

[0006] Step S2: performing probe pulse superposition processing on the short and wide laser pulse signals, and performing grating time domain projection imaging, thereby obtaining pulse time domain spectrum imaging; generating the time orientation of different frequency components based on the pulse time domain spectrum imaging;

[0007] Step S3: Identify the photons with small frequency shifts based on the time positions of different frequency components, and analyze the changes in the original photon flux to generate shifted photon flux change parameters;

[0008] Step S4: dynamically calibrating and tuning the offset photon flux variation parameters to generate an optimally tuned compressed pulse;

[0009] Step S5: using a dispersion compensation device to perform reverse dispersion compensation processing on the optimally tuned compressed pulse, and performing iterative optimization of pulse broadening, thereby generating a dispersion compensation optimized pulse;

[0010] Step S6: Calculate the pulse power amplitude change of the dispersion compensation optimized pulse and construct the amplitude-time response curve of different polarization states; perform global dynamic modulation optimization of the pulse based on the amplitude-time response curve of different polarization states and construct a pulse precision modulation engine to perform pulse compression modulation operations.

[0011] The present invention obtains ultraviolet laser pulse signals to provide basic data for subsequent processing, realizes further modulation and optimization of laser signals, ensures accurate input signals, and provides a reliable basis for the processing of subsequent steps; based on the optical crystal array, the ultraviolet laser pulse signal is compressed in time width to obtain a short and wide laser pulse signal, which helps to improve the time resolution and accuracy of the laser signal. At the same time, the short and wide laser pulse signal is obtained to achieve more accurate signal processing and analysis, providing a more accurate data basis for subsequent steps; through probe pulse superposition and grating time domain projection imaging, pulse time domain spectrum imaging is obtained to achieve a clear display of the frequency components and time orientation of the laser signal; the time orientation of different frequency components generated based on pulse time domain spectrum imaging helps to deeply analyze the spectrum characteristics of the laser signal and provide accurate frequency information for subsequent processing; the offset Dynamic calibration and tuning simulation are performed on the changing parameters of the photon flux to generate optimally tuned compressed pulses and achieve the best modulation effect of the laser signal; the compression effect of the pulse signal is optimized through dynamic calibration and tuning simulation to improve the signal quality and stability; the optimally tuned compressed pulse is subjected to reverse dispersion compensation processing using a dispersion compensation device to generate a dispersion compensated optimized pulse, which helps to eliminate the signal dispersion effect and improve the signal stability and clarity; the pulse broadening effect is further optimized through iterative optimization of pulse broadening to ensure signal quality and clarity; the global dynamic modulation optimization of the pulse is performed based on the amplitude-time response curves of different polarization states, and a pulse precision modulation engine is constructed to achieve precise modulation and optimization of the pulse signal; the stability and adjustability of the pulse signal are improved through global dynamic modulation optimization of the pulse to ensure the accuracy and efficiency of the pulse compression modulation operation.

[0012] Preferably, step S1 comprises the following steps:

[0013] Step S11: sending fundamental frequency ultraviolet laser pulses to the optical crystal array based on the ultraviolet laser, and identifying the ultraviolet laser pulse signal;

[0014] Step S12: performing nonlinear optical effect analysis on the optical crystal array to obtain multiphoton absorption effect data;

[0015] Step S13: performing light wavelength attenuation analysis on the ultraviolet laser pulse signal according to the multiphoton absorption effect data to obtain a laser pulse wavelength attenuation parameter;

[0016] Step S14: compressing the pulse time width of the ultraviolet laser pulse signal based on the laser pulse wavelength attenuation parameter, thereby obtaining a short and wide laser pulse signal.

[0017] The present invention ensures accurate input signals by sending fundamental frequency ultraviolet laser pulses to an optical crystal array and identifying ultraviolet laser pulse signals. Effective signal identification can ensure the accuracy and stability of subsequent analysis and processing steps. The optical crystal array is subjected to nonlinear optical effect analysis to obtain multiphoton absorption effect data, which is helpful for understanding and optimizing the working mechanism of optical elements. The multiphoton absorption effect data provides important information based on nonlinear optical effects, which can be used to optimize parameter selection and adjustment of subsequent processing steps. The present invention performs optical wavelength attenuation analysis on ultraviolet laser pulse signals according to multiphoton absorption effect data to obtain laser pulse wavelength attenuation parameters. Through optical wavelength attenuation analysis, the attenuation status of optical signals during transmission is understood, which helps to adjust signal parameters to maximize signal quality and stability. Based on the laser pulse wavelength attenuation parameters, the ultraviolet laser pulse signal is subjected to pulse time width compression to obtain a short and wide laser pulse signal. Through pulse time width compression, the time characteristics of the signal are optimized, the time resolution and accuracy of the signal are improved, and a more accurate data basis is provided for the processing of subsequent steps.

[0018] Preferably, step S2 comprises the following steps:

[0019] Step S21: performing probe pulse superposition processing on the short and wide laser pulse signal to obtain a coherent superposition pulse signal;

[0020] Step S22: using a grating to perform grating time-domain projection imaging on the coherent superposition pulse signal, thereby obtaining pulse time-domain spectrum imaging;

[0021] Step S23: performing fast Fourier transform on the pulse time domain spectrum imaging to generate pulse frequency domain data;

[0022] Step S24: performing spatial frequency calculation on the pulse frequency domain data to obtain a plurality of spatial frequency interference patterns;

[0023] Step S25: performing multi-frequency position recognition on the multiple spatial frequency interference patterns to generate time positions of different frequency components.

[0024] The present invention performs probe pulse superposition processing on a short and wide laser pulse signal to obtain a coherent superposition pulse signal (coherent superposition helps to enhance the strength and stability of the signal and provide a clearer signal basis for subsequent steps), uses a grating to perform grating time-domain projection imaging on the coherent superposition pulse signal to obtain pulse time-domain spectrum imaging (pulse time-domain spectrum imaging provides spectrum information of the signal in the time domain and provides a basis for subsequent frequency domain analysis), performs fast Fourier transform on the pulse time-domain spectrum imaging to generate pulse frequency domain data (fast Fourier transform can convert the signal from the time domain to the frequency domain to help analyze the frequency components and spectrum characteristics of the signal), performs spatial frequency calculation on the pulse frequency domain data to obtain multiple spatial frequency interference patterns (spatial frequency calculation helps to understand the frequency distribution and interference characteristics of the signal in space), performs multi-frequency position recognition on the multiple spatial frequency interference patterns to generate the time orientation of different frequency components (multi-frequency position recognition helps to determine the spatial and temporal position relationship of different frequency components and provides support for in-depth understanding of the frequency characteristics of the signal).

[0025] Preferably, step S3 specifically comprises the following steps:

[0026] Step S31: performing photon distribution identification on the coherent superposition pulse signal to generate a photon distribution spectrum;

[0027] Step S32: identifying photons with slight frequency shifts on the photon distribution map based on the time positions of different frequency components, thereby extracting frequency shifted photons;

[0028] Step S33: calculating the generation time width of the frequency-shifted photons based on a plurality of spatial frequency interference patterns to obtain the time width of the shifted photons;

[0029] Step S34: performing frequency amplitude characteristic analysis on the frequency-shifted photons to obtain frequency amplitude data of the shifted photons;

[0030] Step S35: performing original photon flux variation analysis on the shifted photon time width and the shifted photon frequency amplitude data to generate shifted photon flux variation parameters.

[0031] The present invention generates a photon distribution spectrum by performing photon distribution recognition on a coherent superposition pulse signal (the photon distribution spectrum provides important information about the distribution of photons in space, helping to understand the spatial characteristics and distribution laws of photons), performs micro-frequency shift photon recognition on the photon distribution spectrum based on the time orientation of different frequency components, extracts frequency-shifted photons, and captures the characteristics of frequency-shifted photons through micro-frequency shift photon recognition, which helps to analyze the frequency change and shift in the signal, and performs time width calculation on the frequency-shifted photons based on multiple spatial frequency interference patterns to obtain the time width of the shifted photons (time The time width calculation provides the characteristic parameters of the offset photons in the time dimension, which helps to understand the time characteristics and time domain waveform of the signal); the frequency amplitude characteristic analysis of the frequency-shifted photons is performed to obtain the frequency amplitude data of the offset photons (the frequency amplitude characteristic analysis helps to understand the frequency changes and amplitude characteristics of the offset photons, and provides an important reference for the frequency modulation characteristics of the signal); the original photon flux change analysis is performed on the offset photon time width and frequency amplitude data to generate the offset photon flux change parameters (the flux change analysis helps to understand the light intensity changes of the offset photons, and provides support for the analysis of the intensity modulation of the optical signal).

[0032] Preferably, the specific steps of step S4 are:

[0033] Step S41: performing frequency component phase shift compensation time on the offset photon light flux variation parameter to generate an offset photon frequency phase shift compensation parameter;

[0034] Step S42: Calculating the grating spacing of the short and wide laser pulse signal to obtain the laser grating spacing;

[0035] Step S43: finely adjusting the laser grating spacing according to the offset photon frequency phase shift compensation parameter, thereby obtaining high-frequency compressed pulse data;

[0036] Step S44: Perform dynamic calibration and tuning simulation on the high-frequency compressed pulse data to generate an optimally tuned compressed pulse.

[0037] The present invention generates offset photon frequency phase shift compensation parameters by performing frequency component phase shift compensation time on offset photon light flux change parameters (frequency phase shift compensation parameters help to adjust the frequency characteristics of the signal so that the signal frequency matches the required frequency, providing a basis for subsequent steps), performs grating spacing calculation on short and wide laser pulse signals to obtain laser grating spacing (grating spacing calculation helps to determine the spatial distribution of the grating, providing a basic reference for modulation parameters for subsequent steps), finely adjusts the laser grating spacing according to the offset photon frequency phase shift compensation parameters to obtain high-frequency compressed pulse data, optimizes the spacing of the laser grating through fine spacing adjustment to match the frequency phase shift compensation parameters, realizes the generation of high-frequency compressed pulses, performs dynamic calibration and tuning simulation on the high-frequency compressed pulse data to generate optimally tuned compressed pulses, and the dynamic calibration and tuning simulation adjusts and optimizes the pulse signal according to real-time data to generate a pulse signal output with the best compression effect.

[0038] Preferably, the specific steps of step S44 are:

[0039] Performing frequency distribution calculation on high-frequency compressed pulse data to obtain compressed pulse frequency distribution parameters;

[0040] Perform time domain sampling and fitting on high-frequency compressed pulse data to generate a pulse time axis;

[0041] The time delay of the pulse time axis is calculated according to the short and wide laser pulse signal to generate the compressed pulse time delay;

[0042] The frequency shift of the compressed pulse frequency distribution parameter is calculated according to the short-width laser pulse signal, thereby generating the compressed pulse frequency shift;

[0043] Dynamic calibration and tuning simulation is performed based on the compressed pulse delay and compressed pulse frequency shift to generate the optimally tuned compressed pulse.

[0044] The present invention calculates the frequency distribution of high-frequency compressed pulse data to accurately understand the characteristics of the pulse signal in the frequency domain. Obtaining the frequency distribution parameters of the compressed pulse helps to optimize the spectrum characteristics of the laser signal and provides an important reference for subsequent processing; by performing time domain sampling and fitting on the high-frequency compressed pulse data, the time axis of the pulse signal can be generated to provide a detailed description of the time characteristics of the pulse signal. The generated pulse time axis helps to accurately understand the time domain characteristics of the pulse signal and provides a basis for the processing and optimization of subsequent steps; the time delay amount of the pulse time axis is calculated according to the short and wide laser pulse signal to generate the time delay amount of the compressed pulse, which helps to adjust and optimize the time delay of the pulse signal. The compressed pulse delay ensures the timing accuracy of the pulse signal and improves the stability and controllability of the signal; the frequency shift of the compressed pulse frequency distribution parameters is calculated according to the short-width laser pulse signal, which can generate the frequency shift of the compressed pulse and realize the adjustment and optimization of the spectrum characteristics. The generated compressed pulse frequency shift helps to adjust the frequency distribution of the pulse signal and improve the frequency stability and accuracy of the signal; dynamic calibration and tuning simulation is performed based on the compressed pulse delay and compressed pulse frequency shift to generate the optimally tuned compressed pulse and realize the comprehensive optimization of the pulse signal; through dynamic calibration and tuning simulation, the time domain and frequency domain characteristics of the pulse signal are ensured to reach the optimal state, thereby improving the signal quality and modulation effect.

[0045] Preferably, the specific steps of step S5 are:

[0046] Step S51: performing nonlinear optical dispersion analysis on the optimally tuned compressed pulse to obtain pulse forward dispersion data;

[0047] Step S52: performing reverse dispersion compensation calculation on the pulse forward dispersion data to generate reverse dispersion compensation parameters;

[0048] Step S53: performing reverse dispersion compensation processing on the optimal tuned compressed pulse using a dispersion compensation device based on the reverse dispersion compensation parameter to obtain a dispersion compensated compressed pulse;

[0049] Step S54: performing dispersion compensation effect evaluation on the dispersion compensated compressed pulse to generate a dispersion compensation evaluation value;

[0050] Step S55: Perform iterative optimization of pulse broadening based on the dispersion compensation evaluation value, thereby generating a dispersion compensation optimized pulse.

[0051] The present invention performs nonlinear optical dispersion analysis on the optimally tuned compressed pulse to obtain data on the dispersion characteristics of the pulse during its propagation in the medium. The obtained pulse forward dispersion data is helpful for understanding the frequency dependence of the pulse during its propagation in the medium, and provides an important reference for subsequent dispersion compensation. The reverse dispersion compensation calculation is performed on the pulse forward dispersion data to generate reverse dispersion compensation parameters for compensating for the dispersion effect of the medium on the pulse. The generated reverse dispersion compensation parameters are helpful for optimizing the dispersion characteristics of the pulse signal and improving the stability and transmission quality of the signal. Based on the reverse dispersion compensation parameters, the optimally tuned compressed pulse is subjected to reverse dispersion compensation processing using a dispersion compensation device to obtain Dispersion compensated compressed pulses, dispersion compensation processing effectively compensates for the dispersion effect of the medium on the pulse signal, and improves the time domain characteristics and transmission stability of the pulse signal; the dispersion compensation effect of the dispersion compensated compressed pulse is evaluated, and a dispersion compensation evaluation value is generated to evaluate the effectiveness and reliability of the compensation effect. The dispersion compensation evaluation value can assist in verifying the effect of dispersion compensation and provide guidance and basis for subsequent optimization; pulse broadening is iteratively optimized based on the dispersion compensation evaluation value to generate dispersion compensation optimized pulses, and further optimize the dispersion compensation effect of the pulse signal. The pulse broadening iterative optimization ensures that the dispersion compensation of the pulse signal reaches the best state, and improves the transmission quality and modulation effect of the pulse signal.

[0052] Preferably, the specific steps of step S6 are:

[0053] Step S61: performing multi-degree polarization rotation simulation on the dispersion compensation optimized pulse to obtain multiple polarization state simulated pulse data signals;

[0054] Step S62: performing pulse power amplitude variation calculation on multiple polarization state analog pulse data signals to obtain power amplitude variation data of different polarization states;

[0055] Step S63: performing time domain pulse fitting on the power amplitude variation data of different polarization states to construct amplitude-time response curves of different polarization states;

[0056] Step S64: performing maximum controllable pulse peak stability calculation on the amplitude-time response curves of different polarization states, and extracting the maximum controllable pulse power peak;

[0057] Step S65: Utilize the maximum controllable pulse power peak to perform global dynamic modulation optimization on the dispersion compensation optimized pulse, and construct a pulse precision modulation engine to perform pulse compression modulation operations.

[0058] The present invention obtains ultraviolet laser pulse signals and compresses the pulse time width through an optical crystal array to generate short and wide laser pulse signals, which helps to improve the time resolution and accuracy of pulse signals and is suitable for application scenarios requiring high resolution; performs probe pulse superposition processing on short and wide laser pulse signals, and generates pulse time domain spectrum imaging using grating time domain projection imaging, providing detailed information about the frequency and time domain behavior of pulse signals, providing a basis for subsequent analysis; performs micro-frequency shift photon identification based on the time orientation of different frequency components, analyzes the original photon flux change, and generates offset photon flux change parameters, which helps to identify and analyze the frequency change of photons and provide data support for subsequent tuning and optimization; dynamically calibrates the tuning mode Simulation, generate optimally tuned compressed pulses, improve the stability and transmission quality of pulse signals, ensure that the pulse signal remains in the best state during the tuning process to meet the requirements of specific applications, use dispersion compensation devices to perform reverse dispersion compensation processing on the optimally tuned compressed pulses, perform iterative optimization of pulse broadening, generate dispersion compensation optimized pulses, improve the time domain characteristics and transmission stability of pulse signals, ensure the quality and accuracy of pulse signals, calculate the pulse power amplitude change of dispersion compensation optimized pulses, construct amplitude-time response curves of different polarization states, perform global dynamic modulation optimization, improve the accuracy and stability of pulse signals, ensure that the performance of pulse signals in different polarization states meets the requirements, and realize precise operation of pulse compression modulation.

[0059] In this specification, a pulse compression modulation system of an ultraviolet laser is provided, which is used to perform the pulse compression modulation method of the ultraviolet laser as described above, comprising:

[0060] A pulse width compression module is used to obtain an ultraviolet laser pulse signal; based on an optical crystal array, the ultraviolet laser pulse signal is compressed in pulse time width to obtain a short and wide laser pulse signal;

[0061] The probe pulse superposition module is used to perform probe pulse superposition processing on the short and wide laser pulse signals and perform grating time domain projection imaging to obtain pulse time domain spectrum imaging; based on the pulse time domain spectrum imaging, the time orientation of different frequency components is generated;

[0062] The photon shift module is used to identify the photons with small frequency shifts based on the time positions of different frequency components, and to analyze the changes in the original photon flux to generate the shifted photon flux change parameters;

[0063] An optimal tuning module is used to dynamically calibrate and tune the parameters of the offset photon flux change to generate an optimally tuned compressed pulse;

[0064] A dispersion compensation module, used to perform reverse dispersion compensation processing on the optimally tuned compressed pulse using a dispersion compensation device, and perform iterative optimization of pulse broadening, thereby generating a dispersion compensation optimized pulse;

[0065] The global dynamic modulation module is used to calculate the pulse power amplitude change of the dispersion compensation optimized pulse and construct the amplitude-time response curve of different polarization states; based on the amplitude-time response curve of different polarization states, the pulse global dynamic modulation optimization is performed and a pulse precision modulation engine is constructed to perform pulse compression modulation operations.

[0066] The present invention obtains ultraviolet laser pulse signals; compresses the pulse time width through an optical crystal array to generate short and wide laser pulse signals, improves the time resolution, makes the laser pulse shorter and more precise, and helps to achieve more precise operations in high-frequency applications; performs probe pulse superposition processing on the short and wide laser pulse signals; obtains pulse time domain spectrum imaging through grating time domain projection imaging, provides detailed pulse signal frequency and time domain characteristic information, and provides a basis for subsequent analysis and processing; identifies tiny frequency-shifted photons based on the time orientation of different frequency components, analyzes the original photon flux changes, and generates offset photon flux change parameters, which helps to identify tiny frequency changes, provides detailed analysis of photon behavior, and provides support for subsequent tuning and optimization; Through dynamic calibration tuning simulation, the optimal tuned compressed pulse is obtained, the stability and quality of the laser signal are improved, and the pulse signal is ensured to maintain the best performance during the tuning process to meet the needs of different applications; the dispersion compensation device is used to perform reverse dispersion compensation processing on the optimal tuned compressed pulse, and pulse broadening is iteratively optimized to generate dispersion compensation optimized pulses, improve the time domain characteristics and transmission stability of the pulse signal, and ensure the quality and accuracy of the pulse signal; the pulse power amplitude change of the dispersion compensation optimized pulse is calculated, the amplitude-time response curve of different polarization states is constructed, and the global dynamic modulation optimization of the pulse is performed to improve the accuracy and stability of the pulse signal, ensure that the performance of the pulse signal in different polarization states meets the requirements, and realize the precise operation of pulse compression modulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 A schematic flow chart of the steps of a pulse compression modulation method for an ultraviolet laser according to the present invention;

[0068] Figure 2 Detailed implementation flow chart of step S1;

[0069] Figure 3 Detailed implementation flow chart of step S2;

[0070] Figure 4 Detailed implementation flow chart of step S3. DETAILED DESCRIPTION

[0071] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0072] The example of the present application provides a pulse compression modulation method and system for an ultraviolet laser. The execution subjects of the method and system include but are not limited to: mechanical equipment, data processing platform, cloud server node, network upload device, etc. equipped with the system can be regarded as the general computing node of the present application. The data processing platform includes but is not limited to: at least one of an audio image management system, an information management system, and a cloud data management system.

[0073] See also Figures 1 to 4 The present invention provides a pulse compression modulation method for an ultraviolet laser, characterized in that the ultraviolet laser internally includes an optical crystal array, a grating and a dispersion compensation device; the method comprises the following steps:

[0074] Step S1: obtaining an ultraviolet laser pulse signal; compressing the pulse time width of the ultraviolet laser pulse signal based on an optical crystal array, thereby obtaining a short and wide laser pulse signal;

[0075] Step S2: performing probe pulse superposition processing on the short and wide laser pulse signals, and performing grating time domain projection imaging, thereby obtaining pulse time domain spectrum imaging; generating the time orientation of different frequency components based on the pulse time domain spectrum imaging;

[0076] Step S3: Identify the photons with small frequency shifts based on the time positions of different frequency components, and analyze the changes in the original photon flux to generate shifted photon flux change parameters;

[0077] Step S4: dynamically calibrating and tuning the offset photon flux variation parameters to generate an optimally tuned compressed pulse;

[0078] Step S5: using a dispersion compensation device to perform reverse dispersion compensation processing on the optimally tuned compressed pulse, and performing iterative optimization of pulse broadening, thereby generating a dispersion compensation optimized pulse;

[0079] Step S6: Calculate the pulse power amplitude change of the dispersion compensation optimized pulse and construct the amplitude-time response curve of different polarization states; perform global dynamic modulation optimization of the pulse based on the amplitude-time response curve of different polarization states and construct a pulse precision modulation engine to perform pulse compression modulation operations.

[0080] The present invention obtains ultraviolet laser pulse signals to provide basic data for subsequent processing, realizes further modulation and optimization of laser signals, ensures accurate input signals, and provides a reliable basis for the processing of subsequent steps; based on the optical crystal array, the ultraviolet laser pulse signal is compressed in time width to obtain a short and wide laser pulse signal, which helps to improve the time resolution and accuracy of the laser signal, and obtains a short and wide laser pulse signal to achieve more accurate signal processing and analysis, providing a more accurate data basis for subsequent steps; through probe pulse superposition and grating time domain projection imaging, pulse time domain spectrum imaging is obtained to achieve a clear display of the frequency components and time orientation of the laser signal; based on pulse time domain spectrum imaging, the time orientation of different frequency components is generated, which helps to deeply analyze the spectrum characteristics of the laser signal, provides accurate frequency information for subsequent processing, and can accurately analyze the offset light Dynamic calibration and tuning simulation is performed on the changing parameters of the sub-luminous flux to generate the optimally tuned compressed pulse and achieve the best modulation effect of the laser signal; the compression effect of the pulse signal is optimized through dynamic calibration and tuning simulation to improve the signal quality and stability; the optimally tuned compressed pulse is subjected to reverse dispersion compensation processing by the dispersion compensation device to generate dispersion compensated optimized pulses, which helps to eliminate the signal dispersion effect and improve the signal stability and clarity; the pulse broadening effect is further optimized through iterative optimization of pulse broadening to ensure signal quality and clarity; the global dynamic modulation optimization of the pulse is performed based on the amplitude-time response curve of different polarization states, and a pulse precision modulation engine is constructed to achieve precise modulation and optimization of the pulse signal; the stability and adjustability of the pulse signal are improved through global dynamic modulation optimization of the pulse to ensure the accuracy and efficiency of the pulse compression modulation operation.

[0081] In the embodiment of the present invention, refer to Figure 1 , is a schematic flow chart of the steps of a pulse compression modulation method of an ultraviolet laser of the present invention. In this example, the steps of the pulse compression modulation method of the ultraviolet laser include:

[0082] Step S1: obtaining an ultraviolet laser pulse signal; compressing the pulse time width of the ultraviolet laser pulse signal based on an optical crystal array, thereby obtaining a short and wide laser pulse signal;

[0083] In this embodiment, an ultraviolet laser or other related equipment is used to generate an initial ultraviolet laser pulse signal, ensuring that the acquired pulse signal has appropriate time width, spectral characteristics and other parameters, and the initial ultraviolet laser pulse signal is coupled into the first nonlinear optical crystal. In this crystal, the pulse signal will undergo a dispersion effect, resulting in phase delays in different frequency components. After passing through the first crystal, the pulse signal enters the next crystal of a different material. In these subsequent crystals, the dispersion effect will continue to accumulate, and ultimately the pulse time width will be compressed. By optimizing parameters such as the type, size, and arrangement order of the crystal, the desired short pulse output can be obtained.

[0084] Step S2: performing probe pulse superposition processing on the short and wide laser pulse signals, and performing grating time domain projection imaging, thereby obtaining pulse time domain spectrum imaging; generating the time orientation of different frequency components based on the pulse time domain spectrum imaging;

[0085] In this embodiment, the short and wide laser pulse signal is divided into two paths, one path is used as the main pulse, and the other path is used as the probe pulse. The time delay of the probe pulse relative to the main pulse is adjusted by an optical delay line, etc., the main pulse and the probe pulse are superimposed and merged to form a signal after the probe pulse is superimposed, and the signal after the probe pulse is superimposed is introduced into the grating system, and the grating will perform spatial encoding and time domain projection on the pulse signal; through the diffraction characteristics of the grating, the time domain information of the pulse signal is converted into a spatial distribution, and a high-speed imaging detector, such as a CCD or CMOS, is used to record the spatial image of this time domain projection; by analyzing and processing the imaging results of the grating time domain projection, the time domain spectral distribution information of the pulse signal is obtained, that is, the pulse time domain spectral imaging result is obtained, and the time information of different frequency components is extracted from the pulse time domain spectral imaging data; according to the time difference of these frequency components, their distribution in time and space is calculated, thereby generating the azimuth distribution of different frequency components in time and space.

[0086] Step S3: Identify the photons with small frequency shifts based on the time positions of different frequency components, and analyze the changes in the original photon flux to generate shifted photon flux change parameters;

[0087] In this embodiment, the time distribution and position characteristics of each frequency component are analyzed based on the time orientation information of different frequency components, photon signals with small frequency shifts are identified, the photon counts and distribution characteristics of each frequency component are measured and recorded, the photon count changes between different frequency components are analyzed, and the characteristics and laws of the original photon flux changes are determined; based on the identification results of photons with small frequency shifts and combined with the analysis of the original photon flux changes, the flux change parameters of the shifted photons are calculated, including the photon count change amplitude, frequency offset, etc.

[0088] Step S4: dynamically calibrating and tuning the offset photon flux variation parameters to generate an optimally tuned compressed pulse;

[0089] In this embodiment, the offset photon flux change parameters obtained in the previous step are dynamically calibrated. These parameters are affected by various factors and need to be dynamically adjusted. By setting relevant calibration models and monitoring parameter changes in real time, the parameters are dynamically corrected to more accurately reflect the actual situation. On the basis of dynamic calibration, tuning simulation is required. According to the calibrated flux change parameters, a corresponding tuning model is established. Through simulation calculation, different tuning schemes and strategies are explored to find the optimal tuning parameter combination so that the output pulse meets the requirements.

[0090] Step S5: using a dispersion compensation device to perform reverse dispersion compensation processing on the optimally tuned compressed pulse, and performing iterative optimization of pulse broadening, thereby generating a dispersion compensation optimized pulse;

[0091] In this embodiment, after obtaining the optimal tuned compressed pulse, it is necessary to use a dispersion compensation device to perform reverse dispersion compensation processing on it, to offset the dispersion effect accumulated during the transmission of the pulse, so that the pulse can be restored to a more ideal time and frequency characteristic. On the basis of dispersion compensation, it is necessary to further optimize the time broadening characteristics of the pulse. By designing an optimization algorithm, the pulse is optimized for multiple iterations, with the goal of making the pulse reach the optimal state in both time and frequency, for example, minimizing the pulse time broadening while ensuring that the spectrum width is narrow enough. The optimized parameters obtained in the above steps are applied to the actual system, and the input optimal tuned compressed pulse is subjected to dispersion compensation and broadening optimization processing, so as to obtain a fully optimized final output pulse. This dispersion-compensated optimized pulse has a more ideal time-frequency characteristic.

[0092] Step S6: Calculate the pulse power amplitude change of the dispersion compensation optimized pulse and construct the amplitude-time response curve of different polarization states; perform global dynamic modulation optimization of the pulse based on the amplitude-time response curve of different polarization states and construct a pulse precision modulation engine to perform pulse compression modulation operations.

[0093] In this embodiment, the variation of the pulse power amplitude over time of the dispersion compensation optimized pulse is calculated, which includes considering the influence of different polarization states on the pulse amplitude, establishing a mathematical model, and simulating the amplitude-time response under different polarization states; based on the aforementioned calculation results, the amplitude-time response under different polarization states is modeled and plotted, and curves of the pulse amplitude variation over time under different polarization states are obtained, and these curves serve as the basis for subsequent dynamic modulation optimization; based on the obtained amplitude-time response curve, an optimization algorithm is designed to optimize the global dynamic modulation of the pulse, with the goal of achieving an ideal amplitude distribution for the pulse under different polarization states, which requires comprehensive optimization of multiple parameters of the pulse such as time, frequency, and polarization; the modulation parameters obtained by the aforementioned optimization are applied to the actual system, and a pulse precision modulation engine is established, which can perform pulse compression modulation operations, and this engine flexibly adjusts various parameters of the pulse according to demand, thereby generating an ideal pulse output that meets specific application requirements.

[0094] In this embodiment, refer to Figure 2 , is a flowchart of detailed implementation steps of step S1. In this embodiment, the detailed implementation steps of step S1 include:

[0095] Step S11: sending fundamental frequency ultraviolet laser pulses to the optical crystal array based on the ultraviolet laser, and identifying the ultraviolet laser pulse signal;

[0096] Step S12: performing nonlinear optical effect analysis on the optical crystal array to obtain multiphoton absorption effect data;

[0097] Step S13: performing light wavelength attenuation analysis on the ultraviolet laser pulse signal according to the multiphoton absorption effect data to obtain a laser pulse wavelength attenuation parameter;

[0098] Step S14: compressing the pulse time width of the ultraviolet laser pulse signal based on the laser pulse wavelength attenuation parameter, thereby obtaining a short and wide laser pulse signal.

[0099] In this embodiment, a fundamental frequency ultraviolet laser pulse is sent to an optical crystal array by an ultraviolet laser, and a photodetector is arranged at the output end of the optical crystal array to capture and identify the optical signal generated by the ultraviolet laser pulse; the waveform, amplitude, time characteristics and other parameters of the ultraviolet laser pulse signal are analyzed and recorded through the electrical signal output by the photodetector, and the nonlinear optical effect of the optical crystal under the irradiation of a strong ultraviolet laser pulse is studied, with a focus on the multiphoton absorption effect; the multiphoton absorption characteristics of the optical crystal are observed and recorded by adjusting the laser pulse power density, including parameters such as the absorption coefficient and saturation absorption, and the data such as the transmitted light intensity and the reflected light intensity of the optical crystal under different laser power densities are collected and analyzed to quantify the multiphoton absorption effect, and the experimentally measured multiphoton absorption effect parameters are recorded to form a corresponding test data set; the test data is analyzed and processed to extract the quantitative description index of the multiphoton absorption effect, and a relationship between the multiphoton absorption effect and the laser pulse power density is established. The relationship model provides a basis for the subsequent pulse wavelength analysis; according to the multiphoton absorption effect data, the wavelength attenuation characteristics of the ultraviolet laser pulse when passing through the optical crystal are analyzed, and a mathematical model between the multiphoton absorption effect and the laser pulse wavelength attenuation is established to describe the law of wavelength attenuation changing with power density; by fitting the experimental data with the model, the wavelength attenuation parameters of the laser pulse in the optical crystal, such as the attenuation coefficient, cut-off wavelength, etc., are extracted, and the original laser pulse is processed by the corresponding time compression algorithm. The time compression algorithm uses nonlinear optical effects such as self-phase modulation (SPM) and group delay dispersion compensation to achieve the principle; by reasonably designing the parameters of the time compression algorithm, the wavelength attenuation characteristics are used to compress the laser pulse width to obtain a laser pulse with a shorter time width, and the laser pulse signal after time compression is output as the final short and wide laser pulse signal, and the time width, peak power and other parameters of the compressed laser pulse are measured and recorded to verify the time compression effect.

[0100] In this embodiment, refer to Figure 3 , is a flowchart of detailed implementation steps of step S2. In this embodiment, the detailed implementation steps of step S2 include:

[0101] Step S21: performing probe pulse superposition processing on the short and wide laser pulse signal to obtain a coherent superposition pulse signal;

[0102] Step S22: using a grating to perform grating time-domain projection imaging on the coherent superposition pulse signal, thereby obtaining pulse time-domain spectrum imaging;

[0103] Step S23: performing fast Fourier transform on the pulse time domain spectrum imaging to generate pulse frequency domain data;

[0104] Step S24: performing spatial frequency calculation on the pulse frequency domain data to obtain a plurality of spatial frequency interference patterns;

[0105] Step S25: performing multi-frequency position recognition on the multiple spatial frequency interference patterns to generate time positions of different frequency components.

[0106] In this embodiment, a short width laser pulse signal is sampled and superimposed by a probe pulse method. The probe pulse has a known time delay and frequency characteristics. A coherently superimposed pulse signal is obtained by coherently superimposing it with the short width laser pulse signal. A grating interferometer is used to perform time domain projection imaging on the coherently superimposed pulse signal. The grating will perform spatial separation of the frequency distribution of the pulse signal, thereby obtaining spectral imaging of the pulse signal in the time domain. The pulse time domain spectral imaging data is subjected to a fast Fourier transform. The Fourier transform converts the time domain data into frequency domain data, thereby obtaining the frequency domain characteristics of the pulse signal. By analyzing these interference patterns, the position information of different frequency components in time and space is identified, thereby obtaining the time orientation information of different frequency components.

[0107] In this embodiment, refer to Figure 4 , is a flowchart of detailed implementation steps of step S3. In this embodiment, the detailed implementation steps of step S3 include:

[0108] Step S31: performing photon distribution identification on the coherent superposition pulse signal to generate a photon distribution spectrum;

[0109] Step S32: identifying photons with slight frequency shifts on the photon distribution map based on the time positions of different frequency components, thereby extracting frequency shifted photons;

[0110] Step S33: calculating the generation time width of the frequency-shifted photons based on a plurality of spatial frequency interference patterns to obtain the time width of the shifted photons;

[0111] Step S34: performing frequency amplitude characteristic analysis on the frequency-shifted photons to obtain frequency amplitude data of the shifted photons;

[0112] Step S35: performing original photon flux variation analysis on the offset photon time width and the offset photon frequency amplitude data to generate offset photon flux variation parameters.

[0113] In this embodiment, a high-sensitivity photodetector is used to detect the coherent superposition pulse signal at the photon level, and the number of photons detected at each time point is counted and recorded to generate a photon distribution spectrum in the time domain. This photon distribution spectrum reflects the photon statistical characteristics of the pulse signal in the time domain. Combined with the obtained time position information of each frequency component, photons with slight deviations from the expected frequency are identified in the photon distribution spectrum, and these frequency-shifted photons are extracted to prepare for subsequent analysis; using multiple spatial frequency interference patterns, the width characteristics of the extracted frequency-shifted photons in the time domain are calculated to obtain the time width parameters of these frequency-shifted photons, and the extracted frequency-shifted photons are further analyzed to calculate their amplitude characteristics in the frequency domain to obtain the frequency amplitude data of these frequency-shifted photons, and the change characteristics of the frequency-shifted photons in the time and frequency domains are analyzed to derive the light flux change parameters of these frequency-shifted photons.

[0114] In this embodiment, step S4 includes the following steps:

[0115] Step S41: performing frequency component phase shift compensation time on the offset photon light flux variation parameter to generate an offset photon frequency phase shift compensation parameter;

[0116] Step S42: Calculating the grating spacing of the short and wide laser pulse signal to obtain the laser grating spacing;

[0117] Step S43: finely adjusting the laser grating spacing according to the offset photon frequency phase shift compensation parameter, thereby obtaining high-frequency compressed pulse data;

[0118] Step S44: Perform dynamic calibration and tuning simulation on the high-frequency compressed pulse data to generate an optimally tuned compressed pulse.

[0119] In this embodiment, the frequency information contained in the offset photon flux change parameter is analyzed, and the phase shift time that needs to be compensated is calculated according to the change characteristics of the frequency component. This compensation time is the offset photon frequency phase shift compensation parameter. The spacing of the interference fringes is measured by image processing technology, and the actual spacing parameters of the laser grating are calculated according to the interference fringe spacing formula. The offset photon frequency phase shift compensation parameter obtained in step S41 is input, combined with the laser grating spacing calculated in step S42, and the control feedback mechanism is used to fine-tune the grating spacing to compensate for the frequency phase shift. In this way, optimized high-frequency compressed pulse data is obtained, and the high-frequency compressed pulse data obtained in step S43 is input, combined with various optical parameter information obtained previously, such as power, wavelength, spatial frequency, etc., to establish a dynamic simulation model, calibrate and tune the pulse data, and adjust the time width, frequency amplitude and other indicators of the pulse until the optimal is reached, and finally output the optimal compressed laser pulse after dynamic optimization.

[0120] In this embodiment, the specific steps of step S44 are:

[0121] Performing frequency distribution calculation on high-frequency compressed pulse data to obtain compressed pulse frequency distribution parameters;

[0122] Perform time domain sampling and fitting on high-frequency compressed pulse data to generate a pulse time axis;

[0123] The time delay of the pulse time axis is calculated according to the short and wide laser pulse signal to generate the compressed pulse time delay;

[0124] The frequency shift of the compressed pulse frequency distribution parameter is calculated according to the short-width laser pulse signal, thereby generating the compressed pulse frequency shift;

[0125] Dynamic calibration and tuning simulation is performed based on the compressed pulse delay and compressed pulse frequency shift to generate the optimally tuned compressed pulse.

[0126] In this embodiment, the time domain signal is spectrally analyzed by using methods such as fast Fourier transform (FFT) to obtain frequency distribution parameters such as the main frequency, bandwidth, and frequency amplitude of the pulse (these frequency distribution parameters describe the frequency domain characteristics of the pulse), and the time domain waveform signal of the high-frequency compressed pulse data is collected. The time domain waveform is modeled by using mathematical fitting methods such as Gaussian function and Lorentz function to obtain the time domain parameters of the pulse, such as pulse width, peak amplitude, time shape, etc. (these time domain parameters and frequency distribution parameters together describe the complete characteristics of the pulse). The time domain parameters obtained in step 2 are combined with the optical parameters of the short and wide laser pulse to calculate the time delay of the compressed pulse relative to the short and wide pulse through the time delay formula. This time delay is an important basis for subsequent frequency shift calculation and dynamic calibration. The frequency of the short and wide laser pulse signal is compared and analyzed with the frequency of the compressed pulse signal to calculate the frequency difference between the two, that is, the frequency shift of the compressed pulse relative to the short and wide laser pulse. The calculated time delay and frequency shift are input into the tuning algorithm or model. The algorithm is dynamically adjusted and calibrated according to the time delay and frequency shift to optimize the tuning result and generate the optimal compressed pulse characteristics.

[0127] In this embodiment, step S5 includes the following steps:

[0128] Step S51: performing nonlinear optical dispersion analysis on the optimally tuned compressed pulse to obtain pulse forward dispersion data;

[0129] Step S52: performing reverse dispersion compensation calculation on the pulse forward dispersion data to generate reverse dispersion compensation parameters;

[0130] Step S53: performing reverse dispersion compensation processing on the optimal tuned compressed pulse using a dispersion compensation device based on the reverse dispersion compensation parameter to obtain a dispersion compensated compressed pulse;

[0131] Step S54: performing dispersion compensation effect evaluation on the dispersion compensated compressed pulse to generate a dispersion compensation evaluation value;

[0132] Step S55: Perform iterative optimization of pulse broadening based on the dispersion compensation evaluation value, thereby generating a dispersion compensation optimized pulse.

[0133] In this embodiment, the time domain waveform and frequency domain spectrum of the optimally tuned compressed pulse are collected, and the forward dispersion effect generated when the pulse propagates in the optical medium is analyzed using the nonlinear optical theory, and the forward dispersion parameters of the pulse in different propagation distances or materials, such as group delay dispersion (GDD), third-order dispersion (TOD), etc., are calculated according to the forward dispersion parameters obtained in step S51; the required reverse dispersion compensation parameters are calculated using the reverse dispersion formula, and these compensation parameters include the GDD, TOD, etc. that need to be compensated. The reverse dispersion compensation offsets the forward dispersion effect and restores the pulse to the initial compression state; the reverse dispersion compensation parameters are input into the dispersion Compensation equipment, such as fiber dispersion compensators, dispersion compensation prisms, etc.; pass the optimally tuned compressed pulse through the dispersion compensation equipment to achieve dispersion compensation and correction, collect the compressed pulse signal after dispersion compensation, and perform time domain or frequency domain analysis to evaluate the pulse characteristics, such as pulse width, peak power, bandwidth, etc., and compare them with the ideal compressed pulse. According to the evaluation result, an evaluation value or index of the dispersion compensation effect is given; according to the evaluation value of the dispersion compensation effect, the dispersion compensation parameters or device settings are adjusted, and the above steps are repeated to further improve the dispersion compensation effect through iterative optimization, and finally generate a compressed pulse after dispersion compensation optimization to meet application requirements.

[0134] In this embodiment, the specific steps of step S6 are:

[0135] Step S61: performing multi-degree polarization rotation simulation on the dispersion compensation optimized pulse to obtain multiple polarization state simulated pulse data signals;

[0136] Step S62: performing pulse power amplitude variation calculation on multiple polarization state analog pulse data signals to obtain power amplitude variation data of different polarization states;

[0137] Step S63: performing time domain pulse fitting on the power amplitude variation data of different polarization states to construct amplitude-time response curves of different polarization states;

[0138] Step S64: performing maximum controllable pulse peak stability calculation on the amplitude-time response curves of different polarization states, and extracting the maximum controllable pulse power peak;

[0139] Step S65: Utilize the maximum controllable pulse power peak to perform global dynamic modulation optimization on the dispersion compensation optimized pulse, and construct a pulse precision modulation engine to perform pulse compression modulation operations.

[0140] In this embodiment, computer simulation is used to perform polarization rotation of dispersion compensation optimization pulses at different angles to generate a series of analog pulse data signals with different polarization states. These analog data signals represent the characteristics of the pulses in different polarization states. The time domain waveform and frequency domain spectrum of the analog pulses in each polarization state are analyzed, and the peak power, average power and other parameters of the pulses in different polarization states are calculated to obtain the pulse power variation curves with time in different polarization states. The power amplitude variation data is curve fitted to fit the pulse amplitude response curves with time in different polarization states. These response curves more accurately describe the characteristics of the pulses under different polarization conditions. The response curves in various polarization states are analyzed to calculate the maximum controllable pulse peak value that can be achieved under these conditions. This maximum controllable pulse peak value is the target value for subsequent modulation optimization, with the maximum controllable pulse peak value obtained as the target. The dispersion compensation optimization pulses are dynamically modulated and optimized to improve the pulse characteristics, and a precise pulse modulation algorithm engine is constructed for high-frequency, low-width pulse compression modulation operations.

[0141] In this embodiment, a pulse compression modulation system of an ultraviolet laser is provided, which is used to perform the pulse compression modulation method of the ultraviolet laser as described above, including:

[0142] A pulse width compression module is used to obtain an ultraviolet laser pulse signal; based on an optical crystal array, the ultraviolet laser pulse signal is compressed in pulse time width to obtain a short and wide laser pulse signal;

[0143] The probe pulse superposition module is used to perform probe pulse superposition processing on the short and wide laser pulse signals and perform grating time domain projection imaging to obtain pulse time domain spectrum imaging; based on the pulse time domain spectrum imaging, the time orientation of different frequency components is generated;

[0144] The photon shift module is used to identify the photons with small frequency shifts based on the time positions of different frequency components, and to analyze the changes in the original photon flux to generate the shifted photon flux change parameters;

[0145] An optimal tuning module is used to dynamically calibrate and tune the parameters of the offset photon flux change to generate an optimally tuned compressed pulse;

[0146] A dispersion compensation module, used to perform reverse dispersion compensation processing on the optimally tuned compressed pulse using a dispersion compensation device, and perform iterative optimization of pulse broadening, thereby generating a dispersion compensation optimized pulse;

[0147] The global dynamic modulation module is used to calculate the pulse power amplitude change of the dispersion compensation optimized pulse and construct the amplitude-time response curve of different polarization states; based on the amplitude-time response curve of different polarization states, the pulse global dynamic modulation optimization is performed and a pulse precision modulation engine is constructed to perform pulse compression modulation operations.

[0148] The present invention obtains ultraviolet laser pulse signals, compresses the pulse time width through an optical crystal array, generates short and wide laser pulse signals, improves time resolution, makes laser pulses shorter and more precise, and helps to achieve more precise operations in high-frequency applications; performs probe pulse superposition processing on the short and wide laser pulse signals, obtains pulse time domain spectrum imaging through grating time domain projection imaging, provides detailed pulse signal frequency and time domain characteristic information, and provides a basis for subsequent analysis and processing; performs micro-frequency shift photon identification based on the time orientation of different frequency components, analyzes the original photon flux change, and generates offset photon flux change parameters, which helps to identify micro-frequency changes, provides detailed analysis of photon behavior, and provides support for subsequent tuning and optimization; Through dynamic calibration tuning simulation, the optimal tuned compressed pulse is obtained, the stability and quality of the laser signal are improved, and the pulse signal is ensured to maintain the best performance during the tuning process to meet the needs of different applications; the dispersion compensation device is used to perform reverse dispersion compensation processing on the optimal tuned compressed pulse, and pulse broadening is iteratively optimized to generate dispersion compensation optimized pulses, improve the time domain characteristics and transmission stability of the pulse signal, and ensure the quality and accuracy of the pulse signal; the pulse power amplitude change of the dispersion compensation optimized pulse is calculated, the amplitude-time response curve of different polarization states is constructed, and the global dynamic modulation optimization of the pulse is performed to improve the accuracy and stability of the pulse signal, ensure that the performance of the pulse signal in different polarization states meets the requirements, and realize the precise operation of pulse compression modulation.

[0149] Therefore, the embodiments should be regarded as illustrative and non-restrictive from all points, and the scope of the present invention is limited by the appended claims rather than the above description, and it is therefore intended that all changes falling within the meaning and range of equivalent elements of the application documents are included in the present invention.

[0150] The above is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but should conform to the widest scope consistent with the principles and novel features invented herein.

Claims

1. A pulse compression modulation method for an ultraviolet laser, characterized in that: The ultraviolet laser includes an optical crystal array, a grating and a dispersion compensation device; the steps include: Step S1: obtaining an ultraviolet laser pulse signal; compressing the pulse time width of the ultraviolet laser pulse signal based on an optical crystal array, thereby obtaining a short and wide laser pulse signal; Step S2: performing probe pulse superposition processing on the short and wide laser pulse signals, and performing grating time-domain projection imaging, thereby obtaining pulse time-domain spectrum imaging; generating the time orientation of different frequency components based on the pulse time-domain spectrum imaging; Step S3: Identify the photons with small frequency shifts based on the time positions of different frequency components, and analyze the changes in the original photon flux to generate shifted photon flux change parameters; Step S4: dynamically calibrating and tuning the offset photon flux variation parameters to generate an optimally tuned compressed pulse; Step S5: using a dispersion compensation device to perform reverse dispersion compensation processing on the optimally tuned compressed pulse, and performing iterative optimization of pulse broadening, thereby generating a dispersion compensation optimized pulse; Step S6: Calculate the pulse power amplitude change of the dispersion compensation optimized pulse and construct the amplitude-time response curve of different polarization states; perform global dynamic modulation optimization of the pulse based on the amplitude-time response curve of different polarization states and construct a pulse precision modulation engine to perform pulse compression modulation operations.

2. The pulse compression modulation method of ultraviolet laser according to claim 1, characterized in that: The specific steps of step S1 are: Step S11: sending fundamental frequency ultraviolet laser pulses to the optical crystal array based on the ultraviolet laser, and identifying the ultraviolet laser pulse signal; Step S12: performing nonlinear optical effect analysis on the optical crystal array to obtain multiphoton absorption effect data; Step S13: performing light wavelength attenuation analysis on the ultraviolet laser pulse signal according to the multiphoton absorption effect data to obtain a laser pulse wavelength attenuation parameter; Step S14: compressing the pulse time width of the ultraviolet laser pulse signal based on the laser pulse wavelength attenuation parameter, thereby obtaining a short and wide laser pulse signal.

3. The method according to claim 1, characterized in that The specific steps of step S2 are: Step S21: performing probe pulse superposition processing on the short and wide laser pulse signal to obtain a coherent superposition pulse signal; Step S22: using a grating to perform grating time-domain projection imaging on the coherent superposition pulse signal, thereby obtaining pulse time-domain spectrum imaging; Step S23: performing fast Fourier transform on the pulse time domain spectrum imaging to generate pulse frequency domain data; Step S24: performing spatial frequency calculation on the pulse frequency domain data to obtain a plurality of spatial frequency interference patterns; Step S25: performing multi-frequency position recognition on the multiple spatial frequency interference patterns to generate time positions of different frequency components.

4. The pulse compression modulation method of ultraviolet laser according to claim 1, characterized in that: The specific steps of step S3 are: Step S31: performing photon distribution identification on the coherent superposition pulse signal to generate a photon distribution spectrum; Step S32: identifying photons with slight frequency shifts on the photon distribution map based on the time positions of different frequency components, thereby extracting frequency shifted photons; Step S33: calculating the generation time width of the frequency-shifted photons based on a plurality of spatial frequency interference patterns to obtain the time width of the shifted photons; Step S34: performing frequency amplitude characteristic analysis on the frequency-shifted photons to obtain frequency amplitude data of the shifted photons; Step S35: performing original photon flux variation analysis on the offset photon time width and the offset photon frequency amplitude data to generate offset photon flux variation parameters.

5. The pulse compression modulation method of ultraviolet laser according to claim 1, characterized in that: The specific steps of step S4 are: Step S41: performing frequency component phase shift compensation time on the offset photon light flux variation parameter to generate an offset photon frequency phase shift compensation parameter; Step S42: Calculating the grating spacing of the short and wide laser pulse signal to obtain the laser grating spacing; Step S43: finely adjusting the laser grating spacing according to the offset photon frequency phase shift compensation parameter, thereby obtaining high-frequency compressed pulse data; Step S44: Perform dynamic calibration and tuning simulation on the high-frequency compressed pulse data to generate an optimally tuned compressed pulse.

6. The pulse compression modulation method of ultraviolet laser according to claim 5, characterized in that: The specific steps of step S44 are: Performing frequency distribution calculation on high-frequency compressed pulse data to obtain compressed pulse frequency distribution parameters; Perform time domain sampling and fitting on high-frequency compressed pulse data to generate a pulse time axis; The time delay of the pulse time axis is calculated according to the short and wide laser pulse signal to generate the compressed pulse time delay; The frequency shift of the compressed pulse frequency distribution parameter is calculated according to the short-width laser pulse signal, thereby generating the compressed pulse frequency shift; Dynamic calibration and tuning simulation is performed based on the compressed pulse delay and compressed pulse frequency shift to generate the optimally tuned compressed pulse.

7. The pulse compression modulation method of ultraviolet laser according to claim 1, characterized in that: The specific steps of step S5 are: Step S51: performing nonlinear optical dispersion analysis on the optimally tuned compressed pulse to obtain pulse forward dispersion data; Step S52: performing reverse dispersion compensation calculation on the pulse forward dispersion data to generate reverse dispersion compensation parameters; Step S53: performing reverse dispersion compensation processing on the optimal tuned compressed pulse using a dispersion compensation device based on the reverse dispersion compensation parameter to obtain a dispersion compensated compressed pulse; Step S54: performing dispersion compensation effect evaluation on the dispersion compensated compressed pulse to generate a dispersion compensation evaluation value; Step S55: Perform iterative optimization of pulse broadening based on the dispersion compensation evaluation value, thereby generating a dispersion compensation optimized pulse.

8. The pulse compression modulation method of ultraviolet laser according to claim 1, characterized in that: The specific steps of step S6 are: Step S61: performing multi-degree polarization rotation simulation on the dispersion compensation optimized pulse to obtain multiple polarization state simulated pulse data signals; Step S62: performing pulse power amplitude variation calculation on multiple polarization state analog pulse data signals to obtain power amplitude variation data of different polarization states; Step S63: performing time domain pulse fitting on the power amplitude variation data of different polarization states to construct amplitude-time response curves of different polarization states; Step S64: performing maximum controllable pulse peak stability calculation on the amplitude-time response curves of different polarization states, and extracting the maximum controllable pulse power peak; Step S65: Utilize the maximum controllable pulse power peak to perform global dynamic modulation optimization on the dispersion compensation optimized pulse, and construct a pulse precision modulation engine to perform pulse compression modulation operations.

9. A pulse compression modulation system for an ultraviolet laser, characterized in that: The method for performing pulse compression modulation of an ultraviolet laser as claimed in claim 1 comprises: A pulse width compression module is used to obtain an ultraviolet laser pulse signal; based on an optical crystal array, the ultraviolet laser pulse signal is compressed in pulse time width to obtain a short and wide laser pulse signal; The probe pulse superposition module is used to perform probe pulse superposition processing on the short and wide laser pulse signals and perform grating time domain projection imaging to obtain pulse time domain spectrum imaging; based on the pulse time domain spectrum imaging, the time orientation of different frequency components is generated; The photon shift module is used to identify the photons with small frequency shifts based on the time positions of different frequency components, and to analyze the changes in the original photon flux to generate the shifted photon flux change parameters; An optimal tuning module is used to dynamically calibrate and tune the parameters of the offset photon flux change to generate an optimally tuned compressed pulse; A dispersion compensation module, used to perform reverse dispersion compensation processing on the optimally tuned compressed pulse using a dispersion compensation device, and perform iterative optimization of pulse broadening, thereby generating a dispersion compensation optimized pulse; The global dynamic modulation module is used to calculate the pulse power amplitude change of the dispersion compensation optimized pulse and construct the amplitude-time response curve of different polarization states; based on the amplitude-time response curve of different polarization states, the pulse global dynamic modulation optimization is performed and a pulse precision modulation engine is constructed to perform pulse compression modulation operations.

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