Calculation method of thermal blooming distortion parameters of broadband beams and calculation model establishment method and system

Abstract

The present invention relates to a method for calculating the thermal blooming distortion parameters of a wide-spectrum light beam and a method and system for establishing a calculation model, and belongs to the field of wide-spectrum laser atmospheric transmission assessment. The model establishment method comprises collecting a first characteristic parameter of the wide-spectrum light beam and a second characteristic parameter at different transmission distances along the optical path; and completing the establishment of a calculation model for the thermal blooming distortion parameters of the wide-spectrum light beam based on the first characteristic parameter of the wide-spectrum light beam and the second characteristic parameter at different transmission distances along the optical path. In response to the shortcomings of the calculation method for the thermal blooming distortion parameters of a high-power wide-spectrum light beam, the present invention takes into account the combined effect of different wavelengths of the wide-spectrum light beam and the significant characteristics of the power distribution of the wide-spectrum light beam source at multiple wavelengths, and combines the principle of treating the wide-spectrum light beam as equivalent to monochromatic light to achieve the calculation of the thermal blooming distortion parameters of the atmospheric transmission of a high-power wide-spectrum light beam.

Description

Technical Field

[0001] The present invention belongs to the field of wide-spectrum laser atmospheric transmission assessment, and particularly relates to a method for calculating thermal blooming distortion parameters of a wide-spectrum beam and a method and system for establishing a calculation model. Background Art

[0002] When high-power lasers propagate through the atmosphere, they interact with the atmosphere, producing a thermal blooming effect. This occurs when atmospheric molecules and aerosols absorb the beam's energy, causing changes in the atmospheric temperature and density along the optical path. This, in turn, alters the atmospheric refractive index distribution, which in turn affects the beam's propagation. The thermal blooming distortion parameter is a key parameter characterizing the strength of this effect and plays an important role in the assessment of high-power laser atmospheric transmission.

[0003] Broadband fiber lasers have developed rapidly in recent years and are a hot topic in current research and application. A notable characteristic of broadband laser sources is that their power is distributed across multiple wavelengths. Different wavelengths experience varying degrees of atmospheric attenuation and thermal blooming, and the thermal blooming effects of different wavelengths interact with each other. All wavelengths of broadband lasers collectively heat the atmosphere, causing thermal blooming. However, methods for calculating the thermal blooming distortion parameters of high-power broadband beams are lacking in projects such as optoelectronic system site selection and directed energy. Summary of the Invention

[0004] In response to the above problems, the present invention provides a method for calculating the thermal blooming distortion parameters of a broadband light beam and a method and system for establishing a calculation model.

[0005] A first object of the present invention is to provide a method for establishing a calculation model for thermal blooming distortion parameters of a broadband light beam, comprising:

[0006] collecting a first characteristic parameter of the broadband light beam and a second characteristic parameter at different transmission distances along the light path;

[0007] According to the first characteristic parameter of the broadband light beam and the second characteristic parameter at different transmission distances along the optical path, a calculation model for the thermal blooming distortion parameter of the broadband light beam is established.

[0008] Furthermore, the first characteristic parameters include light source power spectrum density, effective radius, diffraction limit multiple and focal length;

[0009] The second characteristic parameters include atmospheric absorption coefficient, atmospheric extinction coefficient and atmospheric temperature data.

[0010] Furthermore, the establishment of a calculation model for thermal blooming distortion parameters of the broadband light beam based on the first characteristic parameter of the broadband light beam and the second characteristic parameter at different transmission distances along the optical path includes:

[0011] According to the power spectrum density of the broadband light beam, the broadband light beam is equivalent to monochromatic light, and the equivalent wavelength of the broadband light beam is calculated;

[0012] According to the effective radius, diffraction limit magnification and focal length of the broadband beam, the equivalent expansion radius at different transmission distances along the optical path is calculated;

[0013] According to the atmospheric absorption coefficient at different transmission distances along the optical path, the equivalent atmospheric absorption coefficient at different transmission distances along the optical path is calculated;

[0014] According to the atmospheric extinction coefficient at different transmission distances along the optical path, the equivalent atmospheric transmittance at different transmission distances along the optical path is calculated;

[0015] A calculation model for the thermal blooming distortion parameters of broadband beams is established based on the equivalent expansion radius, equivalent atmospheric absorption coefficient, equivalent atmospheric transmittance at different transmission distances along the optical path, and the equivalent wavelength of the broadband beam.

[0016] Furthermore, the calculation formula for the equivalent expansion radius at different transmission distances along the optical path is as follows:

[0017]

[0018] in, is the equivalent expansion radius at different transmission distances along the optical path, is the effective radius of the broadband beam, is the diffraction-limited multiple of the broadband beam, is the light source power spectral density, z is the laser transmission distance, L is the focal length, is the maximum value of the power spectrum distribution wavelength, is the minimum value of the power spectrum distribution wavelength.

[0019] Furthermore, the calculation formula of the equivalent atmospheric absorption coefficient at different transmission distances along the optical path is as follows:

[0020]

[0021] in, is the equivalent atmospheric absorption coefficient at different transmission distances along the optical path, Transmission distance along the optical path z The atmospheric absorption coefficient at Transmission distance along the optical path s The atmospheric extinction coefficient at .

[0022] Furthermore, the calculation formula for the equivalent atmospheric transmittance at different transmission distances along the optical path is as follows:

[0023]

[0024] in, is the equivalent atmospheric transmittance at different transmission distances along the optical path, Transmission distance along the optical path z The atmospheric extinction coefficient at .

[0025] Furthermore, the calculation formula corresponding to the calculation model of the thermal blooming distortion parameter of the broadband beam is as follows:

[0026]

[0027] in, is the thermal blooming distortion parameter of broadband beam, Transmission distance along the optical path z The atmospheric temperature at Transmission distance along the optical path z = 0 atmospheric temperature, is the lateral wind speed, which is the vector sum of the atmospheric wind speed and the optical path rotation wind. is the equivalent wavelength of the broadband light velocity, represents the rate of change of refractive index with respect to temperature, represents the atmospheric density, is the specific heat capacity of atmosphere at constant pressure.

[0028] A second object of the present invention is to provide a method for calculating thermal blooming distortion parameters of a broadband light beam, comprising:

[0029] The above calculation model calculates the thermal blooming distortion parameter of the broadband light beam based on the first characteristic parameter of the broadband light beam and the second characteristic parameter at different transmission distances along the optical path.

[0030] A third object of the present invention is to provide a system for establishing a calculation model for thermal blooming distortion parameters of a broadband light beam, comprising a collection module and a calculation module:

[0031] The collection module is used to collect the first characteristic parameter of the broadband light beam and the second characteristic parameter at different transmission distances along the light path;

[0032] The calculation module is used to establish a calculation model for thermal blooming distortion parameters of the broadband light beam based on the first characteristic parameter of the broadband light beam and the second characteristic parameter at different transmission distances along the optical path.

[0033] Further, the calculation module includes a first submodule, a second submodule, a third submodule, a fourth submodule and a fifth submodule;

[0034] The first submodule is used to convert the broadband light beam into monochromatic light according to the power spectrum density of the broadband light beam, and calculate the equivalent wavelength of the broadband light beam;

[0035] The second submodule is used to calculate the equivalent expansion radius at different transmission distances along the optical path according to the effective radius, diffraction limit multiple and focal length of the broadband beam;

[0036] The third submodule is used to calculate the equivalent atmospheric absorption coefficient at different transmission distances along the optical path according to the atmospheric absorption coefficient at different transmission distances along the optical path;

[0037] The fourth submodule is used to calculate the equivalent atmospheric transmittance at different transmission distances along the optical path according to the atmospheric extinction coefficient at different transmission distances along the optical path;

[0038] The fifth submodule is used to establish a calculation model for the thermal blooming distortion parameters of a broadband light beam based on the equivalent expansion radius, equivalent atmospheric absorption coefficient, equivalent atmospheric transmittance at different transmission distances along the optical path, and the equivalent wavelength of the broadband light beam.

[0039] Beneficial effects of the present invention:

[0040] The present invention provides a method for calculating the thermal blooming distortion parameters of a broadband light beam, as well as a method and system for establishing a calculation model. This method addresses the shortcomings of methods for calculating the thermal blooming distortion parameters of high-power broadband light beams. By considering the combined effects of different wavelengths of a broadband light beam and the significant characteristics of the power distribution of a broadband light beam source at multiple wavelengths, and combining the principle of treating a broadband light beam as equivalent to monochromatic light, the thermal blooming distortion parameters of a high-power broadband light beam transmitted through the atmosphere are obtained.

[0041] The calculation process takes into account the differences in atmospheric parameters and the intensity of thermal blooming effects at different wavelengths, and the combined effect of multi-wavelength thermal blooming effects.

[0042] Finally, the calculation method or model of the thermal blooming distortion parameters of broadband light beams provided by the present invention realizes the calculation of the thermal blooming distortion parameters of broadband light beams, and then realizes the use of thermal blooming distortion parameters to evaluate the impact of high-power laser transmission on beam quality, laying the foundation for simulating and numerically simulating the thermal blooming effect of high-power broadband laser atmospheric transmission in the laboratory.

[0043] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0045] Figure 1 A flow chart of a method for establishing a calculation model for thermal blooming distortion parameters of a broadband light beam according to an embodiment of the present invention is shown;

[0046] Figure 2 shows normalized power spectral density data according to an embodiment of the present invention;

[0047] Figure 3 Figure 2 shows the effective radius, diffraction-limited multiple, and equivalent expansion radius data of a broadband beam according to an embodiment of the present invention, where (a) is the collected effective radius data; (b) is the collected diffraction-limited multiple data; and (c) is the calculated equivalent expansion radius data.

[0048] Figure 4 The atmospheric absorption coefficient and equivalent atmospheric absorption coefficient at different transmission distances along the optical path according to an embodiment of the present invention are shown, where (a) is the atmospheric absorption coefficient collected at 0.17 km; (b) is the atmospheric absorption coefficient collected at a transmission distance of 1.00 km; (c) is the atmospheric absorption coefficient collected at a transmission distance of 3.39 km; and (d) is the calculated distribution of the equivalent atmospheric absorption coefficient as a function of transmission distance.

[0049] Figure 5 The atmospheric extinction coefficient and equivalent atmospheric transmittance at different transmission distances along the optical path according to an embodiment of the present invention are shown, where (a) is the atmospheric extinction coefficient collected at a transmission distance of 0.17 km; (b) is the atmospheric extinction coefficient collected at a transmission distance of 1.00 km; (c) is the atmospheric extinction coefficient collected at a transmission distance of 3.39 km; and (d) is the calculated distribution of equivalent atmospheric transmittance as a function of transmission distance.

[0050] Figure 6 The figure shows the distribution of atmospheric temperature and transverse wind speed collected according to an embodiment of the present invention as a function of transmission distance, wherein (a) is the distribution of atmospheric temperature collected as a function of transmission distance; (b) is the distribution of transverse wind speed collected as a function of transmission distance;

[0051] Figure 7 A framework diagram of a system for establishing a calculation model for thermal blooming distortion parameters of a broadband light beam according to an embodiment of the present invention is shown;

[0052] In the figure: 10, acquisition module; 20, calculation module. DETAILED DESCRIPTION

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0054] like Figure 1 As shown, a method for establishing a calculation model for thermal blooming distortion parameters of a broadband light beam according to an embodiment of the present invention includes:

[0055] S1, collecting the first characteristic parameter of the broadband light beam and the second characteristic parameter at different transmission distances along the light path;

[0056] S2. According to the first characteristic parameter of the broadband light beam and the second characteristic parameter at different transmission distances along the optical path, a calculation model for the thermal blooming distortion parameter of the broadband light beam is established.

[0057] In some embodiments of the present invention, in step S1, the first characteristic parameters include light source power spectrum density, effective radius, diffraction limit magnification and focal length;

[0058] The second characteristic parameters include atmospheric absorption coefficient, atmospheric extinction coefficient and atmospheric temperature data.

[0059] In certain embodiments of the present invention, data on the effective radius and the diffraction limit multiple are measured using a beam quality analyzer, or obtained from a light source manufacturing company, or set according to research needs.

[0060] In some embodiments of the present invention, the atmospheric absorption coefficient data is obtained through field experimental measurements.

[0061] In some embodiments of the present invention, the atmospheric extinction coefficient is obtained by measuring an outdoor experiment.

[0062] In some embodiments of the present invention, atmospheric temperature data is obtained through field experiments.

[0063] In some embodiments of the present invention, step S2 includes:

[0064] S2-1. Based on the power spectral density of the broadband light beam, the broadband light beam is equivalent to monochromatic light, and the equivalent wavelength of the broadband light beam is calculated;

[0065] S2-2. Calculate the equivalent expansion radius at different transmission distances along the optical path based on the effective radius, diffraction-limited magnification, and focal length of the broadband beam.

[0066] S2-3. Calculate the equivalent atmospheric absorption coefficient at different transmission distances along the optical path based on the atmospheric absorption coefficient at different transmission distances along the optical path;

[0067] S2-4. Calculate the equivalent atmospheric transmittance at different transmission distances along the optical path based on the atmospheric extinction coefficient at different transmission distances along the optical path;

[0068] S2-5. A calculation model for the thermal blooming distortion parameters of a broadband light beam is established based on the equivalent expansion radius, equivalent atmospheric absorption coefficient, equivalent atmospheric transmittance at different transmission distances along the optical path, and the equivalent wavelength of the broadband light beam.

[0069] In some embodiments of the present invention, the calculation formula of the equivalent wavelength of the broadband light beam is shown in Formula (1):

[0070] (1)

[0071] In formula (1), is the equivalent wavelength of the broadband light velocity, is the power spectrum density of the light source. Formula (1) is obtained based on the principle that a broad spectrum beam is equivalent to monochromatic light. is the maximum value of the power spectrum distribution wavelength, is the minimum value of the power spectrum distribution wavelength.

[0072] In some embodiments of the present invention, the calculation formula for the equivalent expansion radius at different transmission distances along the optical path is shown in formula (2):

[0073] (2)

[0074] In formula (2), is the equivalent expansion radius at different transmission distances along the optical path, is the effective radius of the broadband beam, is the diffraction-limited multiple of the broadband beam, z is the laser transmission distance, L is the focal length.

[0075] In some embodiments of the present invention, the calculation formula for the equivalent atmospheric absorption coefficient at different transmission distances along the optical path is shown in formula (3):

[0076] (3)

[0077] In formula (3), is the equivalent atmospheric absorption coefficient at different transmission distances along the optical path, Transmission distance along the optical path z The atmospheric absorption coefficient at Transmission distance along the optical path sThe atmospheric extinction coefficient at .

[0078] In some embodiments of the present invention, the calculation formula for the equivalent atmospheric transmittance at different transmission distances along the optical path is shown in formula (4):

[0079] (4)

[0080] In formula (4), is the equivalent atmospheric transmittance at different transmission distances along the optical path, Transmission distance along the optical path z The atmospheric extinction coefficient at .

[0081] In some embodiments of the present invention, the calculation formula corresponding to the calculation model of the thermal blooming distortion parameter of the broadband beam is shown in formula (5):

[0082] (5)

[0083] In formula (5), is the thermal blooming distortion parameter of broadband beam, Transmission distance along the optical path z The atmospheric temperature at Transmission distance along the optical path z = 0 atmospheric temperature, is the lateral wind speed, which is the vector sum of the atmospheric wind speed and the optical path rotation wind. is the equivalent wavelength of the broadband light velocity, represents the rate of change of refractive index with respect to temperature, represents the atmospheric density, is the specific heat capacity of atmosphere at constant pressure.

[0084] By using steps S1-S2 in the above embodiment, a calculation model for thermal blooming distortion parameters is constructed, and the calculation of thermal blooming distortion parameters of broadband beams is realized. Then, the thermal blooming distortion parameters are used to evaluate the impact of high-power laser transmission on beam quality. This lays the foundation for laboratory simulation and numerical simulation of the thermal blooming effect of high-power broadband laser atmospheric transmission. The specific process data involved are shown below:

[0085] Figure 2 The normalized power spectrum density of the light source collected by the embodiment of the present invention is shown Data (normalized power spectral density is obtained by dividing the power spectral density by the maximum power), we can see that nanometer, nm, multiply the normalized power spectral density value by the maximum power to obtain the power spectral density Measured data, when substituted into formula (1), the equivalent wavelength of the broadband beam is 1051.60 nm;

[0086] Figure 3 (a) shows the effective radius of the broadband beam collected by the embodiment of the present invention. data, Figure 3 (b) shows the diffraction-limited multiples of the broad spectrum beam collected by the embodiment of the present invention. Data, focal length kilometers, substituting these data into formula (2), we can get the equivalent expansion radius data at different transmission distances along the optical path, see Figure 3 The curve in (c);

[0087] Figure 4 (a) shows the atmospheric absorption coefficient at a transmission distance of 0.17 km collected by an embodiment of the present invention. Figure 4 (b) shows the atmospheric absorption coefficient at a transmission distance of 1.00 km collected by an embodiment of the present invention. Figure 4 (c) shows the atmospheric absorption coefficient at a transmission distance of 3.39 km collected by the embodiment of the present invention. Substituting these data into formula (3), the equivalent atmospheric absorption coefficient is calculated. Specifically, the equivalent atmospheric absorption coefficient calculated by the embodiment of the present invention is distributed with the transmission distance as shown in the following figure: Figure 4 As shown in (d);

[0088] Figure 5 (a) shows the atmospheric extinction coefficient at a transmission distance of 0.17 km collected by an embodiment of the present invention. Figure 5 (b) shows the atmospheric extinction coefficient at a transmission distance of 1.00 km collected by an embodiment of the present invention. Figure 5 (c) shows the atmospheric extinction coefficient at a transmission distance of 3.39 km collected by the embodiment of the present invention. Substituting these data into formula (4), the equivalent atmospheric transmittance is calculated. Specifically, the equivalent atmospheric transmittance calculated by the embodiment of the present invention is distributed with the transmission distance as shown in the following figure: Figure 5 As shown in (d);

[0089] Figure 6 (a) shows the distribution data of atmospheric temperature along with transmission distance collected by an embodiment of the present invention. Figure 6 (b) shows the distribution data of the lateral wind speed with the transmission distance collected by the embodiment of the present invention. The equivalent wavelength, equivalent expansion radius data, equivalent atmospheric absorption coefficient, and equivalent atmospheric transmittance calculated above are constructed into formula (5), which is the calculation model of the thermal blooming distortion parameter of the wide-spectrum beam. By running formula (5), the thermal blooming distortion parameter of the wide-spectrum beam is calculated. The specific thermal blooming distortion parameter is 34.36.

[0090] According to some embodiments of the present invention, a method for calculating thermal blooming distortion parameters of a broadband light beam includes:

[0091] The calculation model in the above embodiment (i.e., formula (5)) calculates the thermal blooming distortion parameters of the broadband light beam based on the first characteristic parameters of the broadband light beam (the first characteristic parameters include the power spectrum density of the light source, the effective radius, the diffraction limit magnification, and the focal length), and the second characteristic parameters at different transmission distances along the optical path (the second characteristic parameters include the atmospheric absorption coefficient, the atmospheric extinction coefficient, and the atmospheric temperature data).

[0092] In the embodiment of the present invention, the calculation process involved is referred to the calculation of formulas (1) to (4) in the above embodiment.

[0093] like Figure 7 As shown, a system for establishing a calculation model of thermal blooming distortion parameters of a broadband light beam according to some embodiments of the present invention includes a collection module 10 and a calculation module 20:

[0094] The collecting module 10 is used to collect the first characteristic parameter of the broadband light beam and the second characteristic parameter at different transmission distances along the light path;

[0095] The calculation module 20 is used to establish a calculation model for thermal blooming distortion parameters of the broadband light beam according to the first characteristic parameter of the broadband light beam and the second characteristic parameter at different transmission distances along the optical path.

[0096] In some embodiments of the present invention, the calculation module 20 includes a first submodule, a second submodule, a third submodule, a fourth submodule, and a fifth submodule;

[0097] The first submodule is used to convert the broadband light beam into monochromatic light according to the power spectrum density of the broadband light beam, and calculate the equivalent wavelength of the broadband light beam;

[0098] The second submodule is used to calculate the equivalent expansion radius at different transmission distances along the optical path according to the effective radius, diffraction limit multiple and focal length of the broadband beam;

[0099] The third submodule is used to calculate the equivalent atmospheric absorption coefficient at different transmission distances along the optical path according to the atmospheric absorption coefficient at different transmission distances along the optical path;

[0100] The fourth submodule is used to calculate the equivalent atmospheric transmittance at different transmission distances along the optical path according to the atmospheric extinction coefficient at different transmission distances along the optical path;

[0101] The fifth submodule is used to establish a calculation model for the thermal blooming distortion parameters of a broadband light beam based on the equivalent expansion radius, equivalent atmospheric absorption coefficient, equivalent atmospheric transmittance at different transmission distances along the optical path, and the equivalent wavelength of the broadband light beam.

[0102] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for establishing a calculation model for thermal blooming distortion parameters of a broadband beam, characterized in that: include: collecting a first characteristic parameter of the broadband light beam and a second characteristic parameter at different transmission distances along the light path; Based on the first characteristic parameter of the broadband beam and the second characteristic parameter at different transmission distances along the optical path, a calculation model for the thermal blooming distortion parameter of the broadband beam is established; The calculation formula corresponding to the calculation model of the thermal blooming distortion parameter of the broadband beam is as follows: in, is the thermal blooming distortion parameter of broadband beam, Transmission distance along the optical path z The atmospheric temperature at Transmission distance along the optical path z = 0 atmospheric temperature, is the lateral wind speed, which is the vector sum of the atmospheric wind speed and the optical path rotation wind. is the equivalent wavelength of the broadband light velocity, represents the rate of change of refractive index with respect to temperature, represents the atmospheric density, is the specific heat capacity of the atmosphere at constant pressure, is the maximum value of the power spectrum distribution wavelength, is the minimum value of the power spectrum distribution wavelength, is the light source power spectral density, L is the focal length, is the equivalent atmospheric absorption coefficient at different transmission distances along the optical path, is the equivalent atmospheric transmittance at different transmission distances along the optical path, is the equivalent expansion radius at different transmission distances along the optical path.

2. The method for establishing a calculation model for thermal blooming distortion parameters of a broadband light beam according to claim 1, characterized in that: The first characteristic parameters include light source power spectrum density, effective radius, diffraction limit multiple and focal length; The second characteristic parameters include atmospheric absorption coefficient, atmospheric extinction coefficient and atmospheric temperature data.

3. The method for establishing a calculation model for thermal blooming distortion parameters of a broadband light beam according to claim 1, characterized in that: The method of establishing a calculation model for thermal blooming distortion parameters of a broadband light beam based on the first characteristic parameter of the broadband light beam and the second characteristic parameter at different transmission distances along the optical path includes: According to the power spectrum density of the broadband light beam, the broadband light beam is equivalent to monochromatic light, and the equivalent wavelength of the broadband light beam is calculated; According to the effective radius, diffraction limit magnification and focal length of the broadband beam, the equivalent expansion radius at different transmission distances along the optical path is calculated; According to the atmospheric absorption coefficient at different transmission distances along the optical path, the equivalent atmospheric absorption coefficient at different transmission distances along the optical path is calculated; According to the atmospheric extinction coefficient at different transmission distances along the optical path, the equivalent atmospheric transmittance at different transmission distances along the optical path is calculated; A calculation model for the thermal blooming distortion parameters of broadband beams is established based on the equivalent expansion radius, equivalent atmospheric absorption coefficient, equivalent atmospheric transmittance at different transmission distances along the optical path, and the equivalent wavelength of the broadband beam.

4. The method for establishing a calculation model for thermal blooming distortion parameters of a broadband light beam according to claim 3, characterized in that: The calculation formula for the equivalent expansion radius at different transmission distances along the optical path is as follows: in, is the equivalent expansion radius at different transmission distances along the optical path, is the effective radius of the broadband beam, is the diffraction-limited multiple of the broadband beam, is the light source power spectral density, z is the laser transmission distance, L is the focal length, is the maximum value of the power spectrum distribution wavelength, is the minimum value of the power spectrum distribution wavelength.

5. The method for establishing a calculation model for thermal blooming distortion parameters of a broadband light beam according to claim 3, characterized in that: The calculation formula of the equivalent atmospheric absorption coefficient at different transmission distances along the optical path is as follows: in, is the equivalent atmospheric absorption coefficient at different transmission distances along the optical path, Transmission distance along the optical path z The atmospheric absorption coefficient at Transmission distance along the optical path s The atmospheric extinction coefficient at .

6. The method for establishing a calculation model for thermal blooming distortion parameters of a broadband light beam according to claim 3, characterized in that: The calculation formula of the equivalent atmospheric transmittance at different transmission distances along the optical path is as follows: in, is the equivalent atmospheric transmittance at different transmission distances along the optical path, Transmission distance along the optical path s The atmospheric extinction coefficient at .

7. A method for obtaining thermal blooming distortion parameters of a broadband beam, characterized in that: include: The calculation model obtains the thermal blooming distortion parameters of the broadband beam based on the first characteristic parameter of the broadband beam and the second characteristic parameter at different transmission distances along the optical path. The calculation model is established by the establishment method described in any one of claims 1-6.

8. A system for establishing a calculation model for thermal blooming distortion parameters of a broadband light beam, characterized in that: Including collection module and calculation module: The collection module is used to collect the first characteristic parameter of the broadband light beam and the second characteristic parameter at different transmission distances along the light path; The calculation module is used to establish a calculation model for thermal blooming distortion parameters of the broadband light beam based on the first characteristic parameter of the broadband light beam and the second characteristic parameter at different transmission distances along the optical path; The calculation formula corresponding to the calculation model of the thermal blooming distortion parameter of the broadband beam is as follows: in, is the thermal blooming distortion parameter of broadband beam, Transmission distance along the optical path z The atmospheric temperature at Transmission distance along the optical path z = 0 atmospheric temperature, is the lateral wind speed, which is the vector sum of the atmospheric wind speed and the optical path rotation wind. is the equivalent wavelength of the broadband light velocity, represents the rate of change of refractive index with respect to temperature, represents the atmospheric density, is the specific heat capacity of the atmosphere at constant pressure, is the maximum value of the power spectrum distribution wavelength, is the minimum value of the power spectrum distribution wavelength, is the light source power spectral density, L is the focal length, is the equivalent atmospheric absorption coefficient at different transmission distances along the optical path, is the equivalent atmospheric transmittance at different transmission distances along the optical path, is the equivalent expansion radius at different transmission distances along the optical path.

9. The system for establishing a calculation model for thermal blooming distortion parameters of a broadband light beam according to claim 8, characterized in that: The calculation module includes a first submodule, a second submodule, a third submodule, a fourth submodule and a fifth submodule; The first submodule is used to convert the broadband light beam into monochromatic light according to the power spectrum density of the broadband light beam, and calculate the equivalent wavelength of the broadband light beam; The second submodule is used to calculate the equivalent expansion radius at different transmission distances along the optical path according to the effective radius, diffraction limit multiple and focal length of the broadband beam; The third submodule is used to calculate the equivalent atmospheric absorption coefficient at different transmission distances along the optical path according to the atmospheric absorption coefficient at different transmission distances along the optical path; The fourth submodule is used to calculate the equivalent atmospheric transmittance at different transmission distances along the optical path according to the atmospheric extinction coefficient at different transmission distances along the optical path; The fifth submodule is used to establish a calculation model for the thermal blooming distortion parameters of a broadband light beam based on the equivalent expansion radius, equivalent atmospheric absorption coefficient, equivalent atmospheric transmittance at different transmission distances along the optical path, and the equivalent wavelength of the broadband light beam.

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