CN116698375B - Method for acquiring full-laser power section harmonic conversion efficiency curve - Google Patents
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Abstract
The application relates to a method for obtaining a full laser power section harmonic conversion efficiency curve, which belongs to the technical field of high-power lasers, and comprises the steps of injecting fundamental frequency light into a laser device, wherein the energy of the fundamental frequency light is changed in an equal slope in one dimension and is kept unchanged in the other dimension in a light-passing caliber of the fundamental frequency light, and the fundamental frequency light is a flat-top pulse time waveform; under the same experimental initiation, collecting and amplifying fundamental frequency light energy E of system 1 Harmonic conversion system energy E 2 Acquiring a near-field distribution diagram of a fundamental frequency light amplifying system and a near-field distribution diagram of a harmonic conversion system; the application utilizes the spatial distribution of laser energy to collect the gray value distribution of different areas in the same light-passing caliber, calculates the energy distribution of different areas in the light-passing caliber, and obtains the harmonic conversion efficiency under different fundamental frequency light power, thereby drawing the harmonic conversion efficiency curve of the full laser power segment.
Description
Technical Field
The application belongs to the technical field of high-power lasers, and particularly relates to a method for acquiring a full-laser power section harmonic conversion efficiency curve.
Background
The large-scale high-power laser device has strict requirements on the time waveform of the laser pulse, not only is the laser pulse with random shaping within the pulse width range of 0.1 ns-25 ns required to be generated, but also the actual time waveform of the laser pulse is strictly consistent with the designed target time waveform, and the deviation of the actual time waveform from the target time waveform influences the precise physical experiment effect and even leads to failure of experiment initiation, so that the time waveform of the laser pulse needs to be precisely regulated and controlled in order to ensure the smooth and effective development of the physical experiment.
Accurate harmonic conversion efficiency curves are needed to be obtained firstly for precise regulation and control of laser pulse time waveforms, so that the time waveforms of the amplifying system are calculated in an inversion mode, and finally the injection time waveforms of the amplifying system are obtained through gain characteristics. The harmonic conversion efficiency curve has no precise mathematical analysis form, and the conversion efficiency of the harmonic conversion efficiency curve under different fundamental frequency power densities cannot be accurately described by adopting polynomial fitting. At present, formal emission is mainly adopted under different fundamental frequency power densities, under the condition that an amplifying system outputs a flat-top pulse time waveform, the output energy of the amplifying system and the harmonic conversion system is measured, and the harmonic conversion efficiency under the fundamental frequency power density is determined through the energy ratio of the amplifying system and the harmonic conversion system. According to Wnterghem BMV, burkhart SC, haynam Calif., et al National Ignition Facility commissioning and performance Optical Engineering at the Lawrence Livermore National Laboratory II: the National Ignition facility San Jose, calif., USA, 2004, the method requires at least 6 formal emissions to fit a relatively accurate harmonic conversion efficiency curve. Because the large-scale high-power laser device needs to be cooled for at least 3 hours after formally transmitting each time to ensure the heat balance of the system, the acquisition of the harmonic conversion efficiency curve can be completed in at least 2 working days, and meanwhile, the method can not traverse to acquire the harmonic conversion efficiency curves under different fundamental frequency power densities, and is time-consuming, labor-consuming and low in efficiency.
Disclosure of Invention
In order to solve the above-mentioned problems, a method for obtaining a full-laser power harmonic conversion efficiency curve based on laser energy spatial distribution is proposed.
In order to achieve the above purpose, the present application provides the following technical solutions:
a method for acquiring a full laser power section harmonic conversion efficiency curve comprises the following steps:
injecting fundamental frequency light into a laser device, wherein the energy of the fundamental frequency light is changed in an equal slope in one dimension and is kept unchanged in the other dimension in a light-passing caliber of the fundamental frequency light, and the fundamental frequency light is in a flat-top pulse time waveform;
under the same experimental initiation, collecting and amplifying fundamental frequency light energy E of system 1 Harmonic conversion system energy E 2 Acquiring a near-field distribution diagram of a fundamental frequency light amplifying system and a near-field distribution diagram of a harmonic conversion system;
and calculating harmonic conversion efficiency under different fundamental frequency light powers, and drawing a full-laser power section harmonic conversion efficiency curve.
The technical proposal is further that the fundamental frequency light energy E of the acquisition and amplification system 1 Harmonic conversion system energy E 2 The method specifically comprises the following steps:
an amplifying system fundamental frequency light energy meter is arranged at the output end of the amplifying system, and the amplifying system fundamental frequency light energy E is collected by the amplifying system fundamental frequency light energy meter 1 ；
The output end of the harmonic conversion system is provided with a harmonic conversion system energy calorimeter, and the harmonic conversion system energy E is acquired by using the harmonic conversion system energy calorimeter 2 。
The technical scheme is further configured to obtain a near-field distribution diagram of the fundamental frequency light amplifying system and a near-field distribution diagram of the harmonic conversion system, and specifically includes:
an amplifying system CCD is arranged at the output end of the amplifying system, and a near-field distribution map of the fundamental frequency light amplifying system is obtained by utilizing the amplifying system CCD;
and arranging a harmonic conversion system CCD at the output end of the harmonic conversion system, and acquiring a near-field distribution diagram of the harmonic conversion system by using the harmonic conversion system CCD.
The technical scheme is further characterized in that the amplifying system CCD and the harmonic conversion system CCD have the same model, pixel number and pixel size.
The technical scheme is further that harmonic conversion efficiency under different fundamental frequency light power is calculated, and a full laser power section harmonic conversion efficiency curve is drawn, specifically:
spot A on near field distribution diagram of fundamental frequency light amplifying system 1 And spot a on near field profile of harmonic conversion system 2 Dividing the mixture into a plurality of small blocks on average;
and calculating the harmonic conversion efficiency of each small block and the corresponding fundamental frequency light power thereof, traversing all the small blocks to obtain the harmonic conversion efficiency under different fundamental frequency light powers, and drawing a full-laser power section harmonic conversion efficiency curve.
The technical scheme is further configured to calculate harmonic conversion efficiency of each small block and corresponding fundamental frequency light power thereof, and specifically includes:
reading light spot A 1 Is summed to obtain Σd 1 Read-out spot A 2 Is summed to obtain Σd 2 ；
Spot A is taken up 1 Spot a 2 Averagely dividing the light spot A into a plurality of small blocks 1 Summing the gray values of all pixels contained in each small block to obtain Σd 1nN The corresponding energy is E 1 ×Σd 1nN /ΣD 1 Spot A 2 Summing the gray values of all pixels contained in each small block to obtain Σd 2nN The corresponding energy is E 2 ×Σd 2nN /ΣD 2 Spot A 1 Spot a 2 Harmonic conversion efficiency of the same small blockIs (E) 2 ×Σd 2nN /ΣD 2 ）/（E 1 ×Σd 1nN /ΣD 1 ) The fundamental frequency optical power corresponding to the same small block is (E 1 ×Σd 1nN ）/（ΣD 1 X tau), wherein N, N respectively denote the light spot A 1 Spot a 2 The number of fractions divided equally along the different dimensions, τ, represents the pulse width of the flat-top pulse time waveform.
The technical proposal is further arranged that the facula A 1 Spot a 2 Dividing the light spot A into n parts along the dimension parallel to the slope change of the fundamental frequency light energy and the like 1 Spot a 2 The average of N parts is divided along the dimension perpendicular to the slope change of the fundamental light energy, wherein N is more than 100.
The technical scheme is further that effective data are screened out according to the arrangement of fundamental frequency light power from small to large, and a full laser power section harmonic conversion efficiency curve is drawn.
The technical scheme is further characterized in that n groups of harmonic conversion efficiency curves are drawn firstly, and then the n groups of harmonic conversion efficiency curves are fitted into the harmonic conversion efficiency curves of the full laser power section.
The technical scheme is further that before the laser device is in the emission state, the crystal detuning state of the harmonic conversion system is tuned to be consistent with the emission time of the target experiment.
The beneficial effects of the application are as follows:
and acquiring gray value distribution of different areas in the same light-transmitting aperture under the same light-transmitting aperture by utilizing the spatial distribution of laser energy, and calculating the energy distribution of different areas in the light-transmitting aperture to obtain harmonic conversion efficiency under different fundamental frequency light power, thereby drawing a full-laser power section harmonic conversion efficiency curve. The method has the advantages of convenience in operation, capability of covering a full laser power section, accurate harmonic conversion efficiency data and high confidence, and can save time and labor cost.
Drawings
FIG. 1 is a flow chart of the present application;
FIG. 2 is a schematic diagram of an amplifying system and a harmonic conversion system according to the present application;
FIG. 3 shows spot A in the present application 1 A schematic diagram divided into a plurality of small blocks;
FIG. 4 is a schematic diagram of the movement of a small block in the present application;
fig. 5 is a schematic diagram of a harmonic conversion efficiency curve of a full laser power segment in the present application.
In the accompanying drawings: 1-amplifying system fundamental frequency light energy calorimeter, 2-amplifying system CCD, 3-harmonic conversion system energy calorimeter, 4-harmonic conversion system CCD, 5-harmonic conversion system and 6-amplifying system.
Detailed Description
In order to make the technical solution of the present application better understood by those skilled in the art, the technical solution of the present application will be clearly and completely described in the following with reference to the accompanying drawings, and based on the embodiments of the present application, other similar embodiments obtained by those skilled in the art without making any inventive effort should be included in the scope of protection of the present application. In addition, directional words such as "upper", "lower", "left", "right", and the like, as used in the following embodiments are merely directions with reference to the drawings, and thus, the directional words used are intended to illustrate, not to limit, the application.
Embodiment one:
as shown in fig. 1, a method for obtaining a harmonic conversion efficiency curve of a full laser power segment includes:
s100, injecting fundamental frequency light into a laser device, wherein the energy of the fundamental frequency light is changed in an equal slope in one dimension and is kept unchanged in the other dimension in the light transmission aperture of the fundamental frequency light, and the fundamental frequency light is in a flat-top pulse time waveform.
It should be noted that, the flat-top pulse time waveform means that the top of the time waveform of the laser pulse is flat-top, and the sum of the integral areas of the front edge and the rear edge of the pulse is not more than 10% of the integral area of the whole pulse. The light-transmitting aperture is unchanged, and the fundamental frequency light power range in the light-transmitting aperture comprises a power lowest point and a power highest point. Under the same laser pulse width, the laser energy spatial distribution can provide the parameter information of the full fundamental frequency power density which continuously changes from low to high, and the laser energy spatial distribution refers to that the fundamental frequency light energy is changed in an equal slope in one dimension (horizontal or vertical direction) and is kept unchanged in the other dimension (vertical or horizontal direction) in the laser light transmission caliber.
S300, under the same experimental initiation, collecting and amplifying fundamental frequency light energy E of system 1 Harmonic conversion system energy E 2 And acquiring a near-field distribution diagram of the fundamental frequency light amplification system and a near-field distribution diagram of the harmonic conversion system.
S500, calculating harmonic conversion efficiency under different fundamental frequency light power, and drawing a full laser power section harmonic conversion efficiency curve.
As shown in fig. 2, in the laser device, an amplifying system 6, a transmission link, and a harmonic conversion system 5 are provided in this order along the laser pulse signal transmission direction.
The fundamental frequency light energy E of the acquisition and amplification system 1 Harmonic conversion system energy E 2 The method specifically comprises the following steps:
an amplifying system fundamental frequency light energy meter 1 is arranged at the output end of the amplifying system 6, and the amplifying system fundamental frequency light energy meter 1 is used for collecting the amplifying system fundamental frequency light energy E 1 ；
A harmonic conversion system energy calorie meter 3 is arranged at the output end of the harmonic conversion system 5, and the harmonic conversion system energy calorie meter 3 is utilized to collect the harmonic conversion system energy E 2 。
Further, the acquiring the near-field distribution map of the fundamental frequency light amplifying system and the near-field distribution map of the harmonic conversion system specifically includes:
an amplifying system CCD2 is arranged at the output end of the amplifying system 6, and a near-field distribution diagram of a fundamental frequency light amplifying system is obtained by utilizing the amplifying system CCD 2;
and a harmonic conversion system CCD4 is arranged at the output end of the harmonic conversion system 5, and a near-field distribution diagram of the harmonic conversion system is acquired by utilizing the harmonic conversion system CCD4.
The amplifying system 6 splits part of the reference light to be incident on the fundamental frequency light energy calorimeter 1 and the amplifying system CCD2, and the harmonic conversion system 5 splits part of the reference light to be incident on the harmonic conversion system energy calorimeter 3 and the harmonic conversion system CCD4 under the same experimental initiation.
Further, in order to ensure consistency of the acquired data and facilitate subsequent data processing, the amplifying system CCD2 and the harmonic conversion system CCD4 have the same model, pixel number and pixel size.
The light spot a of the laser after harmonic conversion on the harmonic conversion system CCD4 2 The size of the light spot A of fundamental frequency laser on the amplifying system CCD2 is equal to that of the fundamental frequency laser 1 Converted to the same resolution (same pixel row number) and find spot A 2 Point on spot A 1 Corresponding to the position on the substrate.
Further, the harmonic conversion efficiency under different fundamental frequency light power is calculated, and a full laser power section harmonic conversion efficiency curve is drawn, specifically:
spot A on near field distribution diagram of fundamental frequency light amplifying system 1 And spot a on near field profile of harmonic conversion system 2 Dividing the mixture into a plurality of small blocks on average;
and calculating the harmonic conversion efficiency of each small block and the corresponding fundamental frequency light power thereof, traversing all the small blocks to obtain the harmonic conversion efficiency under different fundamental frequency light powers, and drawing a full-laser power section harmonic conversion efficiency curve.
Further, the calculating the harmonic conversion efficiency of each small block and the corresponding fundamental frequency optical power thereof specifically includes:
reading light spot A 1 Is summed to obtain Σd 1 Read-out spot A 2 Is summed to obtain Σd 2 ；
Spot A is taken up 1 Spot a 2 Averagely dividing the light spot A into a plurality of small blocks 1 Summing the gray values of all pixels contained in each small block to obtain Σd 1nN The corresponding energy is E 1 ×Σd 1nN /ΣD 1 Spot A 2 Summing the gray values of all pixels contained in each small block to obtain Σd 2nN The corresponding energy is E 2 ×Σd 2nN /ΣD 2 Spot A 1 Spot a 2 The harmonic conversion efficiency of the same small block in (E) 2 ×Σd 2nN /ΣD 2 ）/（E 1 ×Σd 1nN /ΣD 1 ) The fundamental frequency optical power corresponding to the same small block is (E 1 ×Σd 1nN ）/（ΣD 1 X tau), wherein N, N respectively denote the light spot A 1 Spot a 2 The number of fractions divided equally along the different dimensions, τ, represents the pulse width of the flat-top pulse time waveform.
Spot a, as shown in fig. 3 1 Spot a 2 Dividing the light spot A into n parts along the dimension parallel to the slope change of the fundamental frequency light energy and the like 1 Spot a 2 The average of N parts is divided along the dimension perpendicular to the slope change of the fundamental light energy, wherein N is more than 100.
In addition, when N cannot take a larger value, in order to obtain more experimental data, a manner of moving the small block by a certain number of pixels may be adopted, so that the harmonic conversion efficiency curve is smoother, as shown in fig. 4.
Specifically, assuming that the resolution of the amplifying system CCD2 is 512×512 and N is taken to be 100, each small block contains 5 rows of pixels, 508 (512-5+1=508) sets of data can be obtained by moving the small block one row at a time in the manner shown in fig. 4, which is equivalent to N is taken to 508.
It should be noted that, N may be referred to as N, however, since the laser energy remains unchanged in another dimension, N sets of data obtained in the dimension are theoretically the same, and therefore N sets of data are to be divided, and it is actually impossible to obtain an absolutely ideal energy distribution with an equal slope change in one dimension in consideration of experiments, where local energy distribution jumps may exist, and at this time, other N sets of corresponding region data may be used to remove abnormal data.
Further, effective data are screened out according to the arrangement of the fundamental frequency light power from small to large, and a full laser power section harmonic conversion efficiency curve is drawn, as shown in fig. 5.
In other embodiments, n sets of harmonic conversion efficiency curves may be drawn first, and then the n sets of harmonic conversion efficiency curves may be fitted to the full laser power segment harmonic conversion efficiency curves.
Further, before the laser device is in the emission state, the crystal detuning state of the harmonic conversion system is tuned to be consistent with the emission time of the target experiment.
The foregoing detailed description of the application has been presented for purposes of illustration and description, but is not intended to limit the scope of the application, i.e., the application is not limited to the details shown and described.
Claims (8)
1. The method for acquiring the full laser power section harmonic conversion efficiency curve is characterized by comprising the following steps of:
injecting fundamental frequency light into a laser device, wherein the energy of the fundamental frequency light is changed in an equal slope in one dimension and is kept unchanged in the other dimension, the fundamental frequency light is a flat-top pulse time waveform, the top of the time waveform of a laser pulse is a flat top, and the sum of the integral areas of the front edge and the rear edge of the pulse is not more than 10% of the integral area of the whole pulse;
under the same experimental initiation, collecting and amplifying fundamental frequency light energy E of system 1 Harmonic conversion system energy E 2 Acquiring a near-field distribution diagram of a fundamental frequency light amplifying system and a near-field distribution diagram of a harmonic conversion system;
calculating harmonic conversion efficiency under different fundamental frequency light power, and drawing a full-laser power section harmonic conversion efficiency curve, wherein the method specifically comprises the following steps:
spot A on near field distribution diagram of fundamental frequency light amplifying system 1 And spot a on near field profile of harmonic conversion system 2 Dividing the mixture into a plurality of small blocks on average;
calculating the harmonic conversion efficiency of each small block and the corresponding fundamental frequency light power thereof, traversing all the small blocks to obtain the harmonic conversion efficiency under different fundamental frequency light powers, and drawing a full-laser power section harmonic conversion efficiency curve;
the harmonic conversion efficiency of each small block and the corresponding fundamental frequency light power are calculated, and the method specifically comprises the following steps:
reading light spot A 1 Is summed to obtain Σd 1 Read-out spot A 2 Is summed to obtain Σd 2 ；
Spot A is taken up 1 Spot a 2 Averagely dividing the light spot A into a plurality of small blocks 1 Summing the gray values of all pixels contained in each small block to obtain Σd 1nN The corresponding energy is E 1 ×Σd 1nN /ΣD 1 Spot A 2 Summing the gray values of all pixels contained in each small block to obtain Σd 2nN The corresponding energy is E 2 ×Σd 2nN /ΣD 2 Spot A 1 Spot a 2 The harmonic conversion efficiency of the same small block in (E) 2 ×Σd 2nN /ΣD 2 ）/（E 1 ×Σd 1nN /ΣD 1 ) The fundamental frequency optical power corresponding to the same small block is (E 1 ×Σd 1nN ）/（ΣD 1 X tau), wherein N, N respectively denote the light spot A 1 Spot a 2 The number of fractions divided equally along the different dimensions, τ, represents the pulse width of the flat-top pulse time waveform.
2. The method for obtaining a full-laser power segment harmonic conversion efficiency curve according to claim 1, wherein the acquisition amplification system fundamental frequency light energy E 1 Harmonic conversion system energy E 2 The method specifically comprises the following steps:
an amplifying system fundamental frequency light energy meter is arranged at the output end of the amplifying system, and the amplifying system fundamental frequency light energy meter is used for collecting the amplifying system fundamental frequency light energy E 1 ；
The method comprises the steps of arranging a harmonic conversion system energy calorimeter at the output end of a harmonic conversion system, and collecting harmonic conversion system energy E by using the harmonic conversion system energy calorimeter 2 。
3. The method for obtaining the harmonic conversion efficiency curve of the full laser power segment according to claim 1, wherein the obtaining the near-field distribution map of the fundamental frequency light amplifying system and the near-field distribution map of the harmonic conversion system specifically comprises:
an amplifying system CCD is arranged at the output end of the amplifying system, and a near-field distribution map of the fundamental frequency light amplifying system is obtained by using the amplifying system CCD;
and arranging a harmonic conversion system CCD at the output end of the harmonic conversion system, and acquiring a near-field distribution diagram of the harmonic conversion system by using the harmonic conversion system CCD.
4. A method for obtaining a full laser power segment harmonic conversion efficiency curve according to claim 3, wherein the amplifying system CCD and the harmonic conversion system CCD have the same model number, number of pixels and pixel size.
5. The method for obtaining a full laser power segment harmonic conversion efficiency curve according to claim 1, wherein the light spot a 1 Spot a 2 Dividing the light spot A into n parts along the dimension parallel to the slope change of the fundamental frequency light energy and the like 1 Spot a 2 The average of N parts is divided along the dimension perpendicular to the slope change of the fundamental light energy, wherein N is more than 100.
6. The method for obtaining the harmonic conversion efficiency curve of the full laser power segment according to claim 5, wherein effective data are screened out according to the arrangement of fundamental frequency light power from small to large, and the harmonic conversion efficiency curve of the full laser power segment is drawn.
7. The method for obtaining a harmonic conversion efficiency curve of a full laser power segment according to claim 5, wherein n groups of harmonic conversion efficiency curves are drawn first, and then the n groups of harmonic conversion efficiency curves are fitted to the harmonic conversion efficiency curve of the full laser power segment.
8. The method of any one of claims 1-7, wherein the crystal detuning state of the harmonic conversion system is tuned to be consistent with the target experimental emission before the laser device is in the emission state.
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