CN113507775B - Multipurpose optical Thomson scattering spectrum measuring system suitable for large-scale laser device - Google Patents
Multipurpose optical Thomson scattering spectrum measuring system suitable for large-scale laser device Download PDFInfo
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- CN113507775B CN113507775B CN202110630175.0A CN202110630175A CN113507775B CN 113507775 B CN113507775 B CN 113507775B CN 202110630175 A CN202110630175 A CN 202110630175A CN 113507775 B CN113507775 B CN 113507775B
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- 238000003384 imaging method Methods 0.000 claims abstract description 23
- 239000011521 glass Substances 0.000 claims abstract description 9
- 230000001681 protective effect Effects 0.000 claims abstract description 8
- 210000002381 plasma Anatomy 0.000 claims abstract 5
- 230000001427 coherent effect Effects 0.000 claims description 52
- 239000000523 sample Substances 0.000 claims description 33
- 238000002834 transmittance Methods 0.000 claims description 19
- 206010020843 Hyperthermia Diseases 0.000 claims description 17
- 230000036031 hyperthermia Effects 0.000 claims description 17
- 230000003993 interaction Effects 0.000 claims description 14
- 238000004611 spectroscopical analysis Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 abstract description 21
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/0006—Investigating plasma, e.g. measuring the degree of ionisation or the electron temperature
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/0006—Investigating plasma, e.g. measuring the degree of ionisation or the electron temperature
- H05H1/0012—Investigating plasma, e.g. measuring the degree of ionisation or the electron temperature using electromagnetic or particle radiation, e.g. interferometry
- H05H1/0018—Details
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- H—ELECTRICITY
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- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/0006—Investigating plasma, e.g. measuring the degree of ionisation or the electron temperature
- H05H1/0012—Investigating plasma, e.g. measuring the degree of ionisation or the electron temperature using electromagnetic or particle radiation, e.g. interferometry
- H05H1/0025—Investigating plasma, e.g. measuring the degree of ionisation or the electron temperature using electromagnetic or particle radiation, e.g. interferometry by using photoelectric means
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H1/00—Generating plasma; Handling plasma
- H05H1/0006—Investigating plasma, e.g. measuring the degree of ionisation or the electron temperature
- H05H1/0012—Investigating plasma, e.g. measuring the degree of ionisation or the electron temperature using electromagnetic or particle radiation, e.g. interferometry
- H05H1/0037—Investigating plasma, e.g. measuring the degree of ionisation or the electron temperature using electromagnetic or particle radiation, e.g. interferometry by spectrometry
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Abstract
The invention belongs to the technical field of laser plasma diagnosis, and particularly relates to a multipurpose optical Thomson scattering spectrum measurement system suitable for a large-scale laser device. The measuring system comprises target point plasmas, protective glass, a hole limiting diaphragm, a light receiving lens, an imaging lens, a filter combination, a grating spectrometer, a half-zone attenuation sheet, an optical fringe camera and a computer which are sequentially arranged; the optical stripe camera is electrically connected with the computer; the hole limiting diaphragm and the half-zone attenuation sheet are movably installed; the F number of the light receiving lens is not more than 4. The invention provides a multipurpose optical Thomson scattering spectrum measuring system suitable for a large-scale laser device, which can be used for thermal coherence Thomson scattering diagnosis and super thermal coherence Thomson scattering diagnosis.
Description
Technical Field
The invention belongs to the technical field of laser plasma diagnosis, and particularly relates to a multipurpose optical Thomson scattering spectrum measurement system suitable for a large-scale laser device.
Background
Optical thomson scattering is one of the common diagnostic methods in laser plasma experiments, and has wide application in the fields of high-energy density physical research such as inertial confinement fusion, particle acceleration, intense field physics and the like. Particularly in inertial confinement fusion research, optical Thomson scattering can be used for diagnosing the frequency and amplitude of electrostatic waves of thermal fluctuation in plasma so as to obtain state parameters such as electron temperature, electron density, ion temperature, ion ionization degree, flow field speed and the like; the method can also be used for diagnosing the frequency and amplitude of the electrostatic wave excited to grow in the laser plasma instability process, so that the careful physical process of the laser plasma instability is studied. The former is referred to as thermal coherence thomson scattering because the diagnostic object is a thermal fluctuation electrostatic wave; the latter diagnostic object is an stimulated growing large amplitude electrostatic wave and is therefore known as hyperthermia coherent thomson scattering.
It is because the thermal coherent thomson scattering and the epithermal coherent thomson scattering are not identical, and the requirements of the measurement system are greatly different. Therefore, in the current experimental study, the thermal coherent Thomson scatterometry system and the epithermal coherent Thomson scatterometry system are two completely independent systems, and the design of the two systems is independently completed according to the experimental requirement. In particular, in thermal coherent thomson scattering, the scattered light signal is present in all directions except the plane of polarization of the probe beam, so the mounting orientation of the measurement system can be flexibly selected over a large range. Thermal coherent thomson scattering is pursued to obtain a high-precision plasma state parameter, and therefore, the light receiving solid angle of the measurement system is required to be as small as possible (i.e., the light receiving F number of the measurement system is as large as possible, and the F number represents the ratio of the focal length to the caliber of the light receiving system). In addition, the thermally coherent thomson scattered light belongs to an extremely weak signal, and therefore the measurement system needs to have high transmission efficiency in the target signal band. Currently, in the experimental study of a large-scale laser device, in order to improve the measurement accuracy of plasma state parameters, the F-number of a thermal coherence thomson scattering measurement system is generally selected to be 10 (for example, the focal length is 300mm, and the light receiving caliber is 30 mm); in order to increase the signal strength as much as possible, the measurement system is typically mounted at an angle of 90 ° to the probe beam. In addition, in order to transmit the target signal over a long distance, there are two common light receiving modes of the measurement system: the Cassegrain structure receives light and the lens receives light.
In the case of the hyperthermia coherent thomson scattering, the direction of the scattered signal is substantially fixed at a certain moment, but varies over time over a certain angular range, so that the measurement system can only be installed in a specific orientation and a large solid angle of light reception (i.e. a small F-number of light reception) is required. The transmission efficiency of the measurement system is not high, since the intensity of the super-thermal coherent thomson scattered light is typically more than two orders of magnitude higher than the intensity of the thermal coherent thomson scattered light. Currently, a super-thermal coherent thomson scattering system generally uses an ellipsoidal mirror to perform reflective light receiving imaging or uses a parabolic mirror to perform reflective light receiving transmission. The reflective light receiving mode has the advantages of no need of considering achromatism problem of light beam transmission, and the disadvantage of long space distance between the light receiving element (i.e. ellipsoidal mirror or parabolic mirror) and the measuring element, which brings the following problems: 1) More support adjusting mechanisms are needed; 2) The aiming difficulty of the light path is high, and the time consumption is long; 3) The whole measuring system is difficult to package and integrate. On a large-scale laser device, limited by experimental environment and experimental resources, the space available for installing a supporting structure and the time available for aiming an optical path are very limited. Therefore, the reflective receiving epithermal coherent thomson scattering system is difficult to be compatible with large-scale laser devices, and is only applied to small-scale laser devices at present.
In summary, the existing thermal coherent thomson scattering measurement system cannot be used for super-thermal coherent thomson scattering diagnosis due to the fact that the received light F number is too large; however, the conventional super-thermal coherent thomson scattering measurement system can realize thermal coherent thomson scattering diagnosis, but many problems caused by a reflective light receiving mode cannot be applied to the experimental environment of a large-scale laser device. Therefore, at present, a set of measurement system is not available on a large-scale laser device, and the system can simultaneously have the capabilities of thermal coherent Thomson scattering diagnosis and super-thermal coherent Thomson scattering diagnosis.
Disclosure of Invention
In order to solve the above problems in the prior art, an object of the present invention is to provide a multipurpose optical thomson scattering spectrometry system suitable for a large-scale laser device.
The technical scheme adopted by the invention is as follows:
the multipurpose optical Thomson scattering spectrum measuring system suitable for large laser device comprises target point plasma, protective glass, a hole limiting diaphragm, a light receiving lens, an imaging lens, a filter combination, a grating spectrometer, a half-area attenuation sheet, an optical fringe camera and a computer which are sequentially arranged, wherein the optical fringe camera is electrically connected with the computer, the hole limiting diaphragm and the half-area attenuation sheet are movably installed, and the F number of the light receiving lens is not more than 4.
When thermal coherence Thomson scattering diagnosis is carried out, the light-passing aperture of the aperture limiting diaphragm is reduced, so that the effective F number of the measuring system is 10; the high transmittance region of the half-zone attenuator is placed on the optical path. 263.3nm probe light is subjected to thermal coherence Thomson scattering in a target area of target plasma, scattered light is converted into parallel light by a light receiving lens to be relayed after passing through protective glass and an aperture limiting diaphragm, and then the parallel light is converged to an incidence slit of an imaging grating spectrometer by an imaging lens. The imaging grating spectrometer utilizes the grating to carry out spectral dispersion on the signal to obtain an ion spectrum bimodal spectrum signal near 263.3nm. After passing through the high-transmittance region of the half-zone attenuation sheet, the bimodal spectrum signal is imaged on the cathode of the optical stripe camera, the optical stripe camera performs time resolution measurement, and then the computer reads and records the data.
When the hyperthermia coherent Thomson scattering diagnosis is carried out, the light transmission caliber of the aperture limiting diaphragm is increased to the maximum, so that the effective F number of the measuring system is the same as the F number of the light receiving lens; both halves of the half-zone attenuator are located on the optical path. 351.3nm interaction beam drives laser plasma instability process in target area of target plasma, 263.3nm probe light and ion sound wave in laser plasma instability process generate hyperthermia coherent Thomson scattering, scattered light is converted into parallel light relay by light receiving lens after passing through protective glass and aperture limiting diaphragm, and then is converged to incident slit of imaging grating spectrometer by imaging lens. The imaging grating spectrometer utilizes the grating to carry out spectral dispersion on the signal to obtain a bimodal spectral signal near 263.3nm. Wherein the stronger peak is a super-thermal coherent Thomson scattering spectrum signal, the weaker peak is a thermal coherent Thomson scattering ion spectrum signal, and the ratio of the intensity of the former to the intensity of the latter is generally more than 100. The super-thermal coherence Thomson scattering spectrum signal and the thermal coherence Thomson scattering ion spectrum signal are imaged on a cathode of the optical fringe camera after passing through a low-transmittance region and a high-transmittance region of the half-area attenuation sheet respectively. The optical fringe camera performs time-resolved measurements of the spectral signal on the cathode, which is then read and recorded by a computer.
The F number of the light receiving lens is not more than 4, and the light receiving lens can be simultaneously suitable for thermal coherence Thomson scattering diagnosis and super thermal coherence Thomson scattering diagnosis. When the invention is used for thermal coherence Thomson scattering diagnosis, the aperture of the aperture limiting diaphragm is reduced, and the high-transmittance area of the half-area attenuation sheet is arranged on an optical path; when the invention is used for the hyperthermia coherent Thomson scattering diagnosis, the aperture of the aperture limiting diaphragm is enlarged, and two half areas of the half area attenuation sheet are both arranged on an optical path. Therefore, when the light receiving lens with the F number not more than 4 is used, the invention can be applied to thermal coherence Thomson scattering diagnosis and epithermal coherence Thomson scattering diagnosis by only adjusting the aperture limiting diaphragm and the half-zone attenuation sheet.
As a preferable scheme of the invention, the caliber of the aperture limiting diaphragm after being reduced is not more than 40mm. The aperture of the aperture limiting diaphragm is not larger than 40mm after the aperture limiting diaphragm is reduced, so that the light transmission aperture of the aperture limiting diaphragm is reduced when the thermal coherence Thomson scattering diagnosis is carried out, the effective F number of a measuring system is 10, and the condition of the thermal coherence Thomson scattering diagnosis is met.
As a preferable scheme of the invention, the caliber of the expanded aperture limiting diaphragm is not smaller than the caliber of the light receiving lens. When the hyperthermia coherent Thomson scattering diagnosis is carried out, the light-passing aperture of the aperture limiting diaphragm can be enlarged or the aperture limiting diaphragm can be directly taken down. Because the light receiving lens is installed and the light path is required to be adjusted, the operation of directly replacing the light receiving lenses with different F numbers is very troublesome and takes a long time. The invention directly adjusts the aperture of the aperture limiting diaphragm or replaces the aperture limiting diaphragm without adjusting the light path, and has simple operation.
As a preferable scheme of the invention, the half-zone attenuation sheet comprises a first half zone and a second half zone which are arranged left and right, wherein the transmittance of the first half zone is more than or equal to 80%, and the transmittance of the second half zone is less than or equal to 10%. When the super-thermal coherent Thomson scattering diagnosis is carried out, the imaging grating spectrometer utilizes the grating to carry out spectral dispersion on the signal, and a bimodal spectral signal near 263.3nm is obtained. Wherein the stronger peak is a super-thermal coherent Thomson scattering spectrum signal, the weaker peak is a thermal coherent Thomson scattering ion spectrum signal, and the ratio of the intensity of the former to the intensity of the latter is generally more than 100. The super-thermal coherent Thomson scattering spectrum signal is attenuated to a greater extent through the second half region, and the thermal coherent Thomson scattering ion spectrum signal is passed through the first half region, so that the intensities of the super-thermal coherent Thomson scattering spectrum signal and the thermal coherent Thomson scattering ion spectrum signal can be adjusted to a similar extent, and both signals can be recorded.
As a preferred embodiment of the present invention, when performing thermal coherence thomson scattering diagnosis, the first half region of the half region attenuation sheet is located on the optical path; when the hyperthermia coherent Thomson scattering diagnosis is carried out, the first half area and the second half area are both positioned on the optical path.
As a preferred embodiment of the invention, when performing thermal coherence Thomson scattering diagnosis, the probe beam passes through the target plasma, and the wavelength of the probe beam is 263.3nm.
As a preferable scheme of the invention, the optical axis of the probe beam forms an included angle of 90 degrees with the optical axis of the light receiving lens. In order to increase the signal intensity as much as possible, the optical axis of the probe beam forms an angle of 90 ° with the optical axis of the light receiving lens.
As a preferred embodiment of the invention, when performing hyperthermia coherent Thomson scattering diagnosis, both the interaction beam and the probe beam pass through the target plasma, the wavelength of the interaction beam is 351.3nm, and the wavelength of the probe beam is 263.3nm.
As a preferable mode of the present invention, the optical axes of the interaction beam, the probe beam and the light receiving lens are located in the same plane, and the optical axis of the interaction beam is located on an angular bisector of the optical axis of the probe beam and the optical axis of the light receiving lens.
As a preferred embodiment of the present invention, the grating spectrometer is an imaging grating spectrometer.
The beneficial effects of the invention are as follows:
1. the F number of the light receiving lens is not more than 4, and the light receiving lens can be simultaneously suitable for thermal coherence Thomson scattering diagnosis and super thermal coherence Thomson scattering diagnosis. When the invention is used for thermal coherence Thomson scattering diagnosis, the aperture of the aperture limiting diaphragm is reduced, and the high-transmittance area of the half-area attenuation sheet is arranged on an optical path; when the invention is used for the hyperthermia coherent Thomson scattering diagnosis, the aperture of the aperture limiting diaphragm is enlarged, and two half areas of the half area attenuation sheet are both positioned on the optical path. Therefore, when the light receiving lens with the F number not more than 4 is used, the invention can be applied to thermal coherence Thomson scattering diagnosis and epithermal coherence Thomson scattering diagnosis by only adjusting the aperture limiting diaphragm and the half-zone attenuation sheet.
2. The light receiving element is a light receiving lens, does not need more supporting and adjusting mechanisms, and has small aiming difficulty of the light path; the whole measuring system is easy to package and integrate, and is suitable for a large-scale laser device.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure, 1-target plasma; 2-probe beam; 3-interaction beam; 4-protecting glass; 5-limiting aperture stop; 6-a light receiving lens; 7-an imaging lens; 8-filter combination; 9-grating spectrometer; 10-half-zone attenuation sheet; 11-an optical stripe camera; 12-computer.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict.
It should be noted that, for the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments.
Thus, the following detailed description of the embodiments of the invention is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In addition, in the present invention, if a specific structure, connection relationship, position relationship, power source relationship, etc. are not specifically written, the structure, connection relationship, position relationship, power source relationship, etc. related to the present invention can be known by those skilled in the art without any creative effort.
As shown in fig. 1, the multipurpose optical thomson scattering spectrum measurement system suitable for a large-scale laser device in this embodiment includes a target plasma 1, a protective glass 4, a limiting aperture 5, a light receiving lens 6, an imaging lens 7, a filter combination 8, a grating spectrometer 9, a half-area attenuation sheet 10, an optical stripe camera 11 and a computer 12, which are sequentially arranged, wherein the optical stripe camera 11 is electrically connected with the computer 12, and the limiting aperture 5 and the half-area attenuation sheet 10 are movably installed; the F number of the light receiving lens 6 is not more than 4, the focal length of the light receiving lens 6 is not less than 300mm, the caliber of the light receiving lens 6 is not less than 75mm, and the focal point of the light receiving lens 6 is positioned at the target position of the target plasma 1. The grating spectrometer 9 is an imaging grating spectrometer.
Wherein the caliber of the aperture limiting diaphragm 5 after the aperture limiting diaphragm is reduced is not more than 40mm. The caliber of the expanded aperture limiting diaphragm 5 is not smaller than the caliber of the light receiving lens 6. As a preferable scheme of the invention, the half-zone attenuation sheet 10 comprises a first half zone and a second half zone which are arranged left and right, wherein the transmittance of the first half zone is more than or equal to 80%, and the transmittance of the second half zone is less than or equal to 10%. As a preferred embodiment of the present invention, probe beam 2 passes through target plasma 1 during thermal coherence Thomson scattering diagnosis, and the wavelength of probe beam 2 is 263.3nm.
As a preferable mode of the present invention, the optical axis of the probe beam 2 forms an angle of 90 ° with the optical axis of the light receiving lens 6. In order to increase the signal intensity as much as possible, the optical axis of the probe beam 2 forms an angle of 90 ° with the optical axis of the light receiving lens 6. In performing thermal coherence thomson scattering diagnostics, probe beam 2 passes through target plasma 1, probe beam 2 having a wavelength of 263.3nm. The optical axis of the probe beam 2 forms an included angle of 90 degrees with the optical axis of the light receiving lens 6. In the case of hyperthermia coherent thomson scattering diagnosis, both the interaction beam 3 and the probe beam 2 pass through the target plasma 1, the wavelength of the interaction beam 3 is 351.3nm, and the wavelength of the probe beam 2 is 263.3nm. The optical axes of the interaction beam 3, the probe beam 2 and the light receiving lens 6 are positioned in the same plane, and the optical axis of the interaction beam 3 is positioned on an angular bisector of the optical axis of the probe beam 2 and the optical axis of the light receiving lens 6. The optimal value of the F number of the light receiving lens 6 is 3.
When thermal coherence Thomson scattering diagnosis is carried out, the light-transmitting aperture of the aperture limiting diaphragm 5 is reduced, so that the effective F number of the measuring system is 10; the high transmittance region (first half-zone) of the half-zone attenuator 10 is placed on the optical path. 263.3nm probe light is subjected to thermal coherence Thomson scattering in a target area of the target plasma 1, the scattered light passes through the protective glass 4 and the aperture limiting diaphragm 5, is converted into parallel light by the light receiving lens 6 to be relayed, and then is converged to an incidence slit of the imaging grating spectrometer 9 by the imaging lens 7. The imaging grating spectrometer 9 performs spectral dispersion on the signal by using a grating to obtain an ion spectrum bimodal spectrum signal near 263.3nm. The bimodal spectrum signal is imaged onto the cathode of the optical fringe camera 11 after passing through the high transmittance region of the half-zone attenuator 10, time-resolved measurement is performed by the optical fringe camera 11, and then the data is read and recorded by the computer 12.
When the super-thermal coherence Thomson scattering diagnosis is carried out, the light transmission caliber of the aperture limiting diaphragm 5 is increased to the maximum, and the aperture limiting diaphragm 5 can be removed, so that the effective F number of the measuring system is the same as the F number of the light receiving lens 6; the first half and the second half of the half attenuator 10 are both located on the optical path. 351.3nm interaction beam 3 drives laser plasma instability process in target area of target plasma 1, 263.3nm probe light and ion sound wave in laser plasma instability process generate hyperthermia coherence Thomson scattering, scattered light is converted into parallel light relay by light receiving lens 6 after passing through protective glass 4 and aperture limiting diaphragm 5, and then is converged to an entrance slit of imaging grating spectrometer 9 by imaging lens 7. The imaging grating spectrometer 9 performs spectral dispersion on the signal by using a grating to obtain a bimodal spectrum signal near 263.3nm. Wherein the stronger peak is a super-thermal coherent Thomson scattering spectrum signal, the weaker peak is a thermal coherent Thomson scattering ion spectrum signal, and the ratio of the intensity of the former to the intensity of the latter is generally more than 100. The epithermal thomson scattering spectrum signal and the thermal thomson scattering ion spectrum signal are imaged on the cathode of the optical fringe camera 11 after passing through the low-transmittance region and the high-transmittance region of the half-area attenuator 10, respectively. The optical fringe camera 11 performs time-resolved measurements of the spectral signal at the cathode and then reads and records the data by the computer 12.
The optical receiving lens 6 of the present invention has an F number of not more than 4, and can be used for both thermal coherent thomson scattering diagnosis and epithermal coherent thomson scattering diagnosis. When the invention is used for thermal coherence Thomson scattering diagnosis, the light-passing aperture of the aperture limiting diaphragm 5 is reduced, and the high-transmittance area of the half-area attenuation sheet 10 is arranged on an optical path; when the invention is used for the hyperthermia coherent Thomson scattering diagnosis, the light-transmitting aperture of the aperture limiting diaphragm 5 is enlarged, and both half areas of the half area attenuation sheet 10 are positioned on the light path. Therefore, when the light receiving lens 6 with the F number not greater than 4 is used, the invention can be applied to thermal coherence thomson scattering diagnosis and epithermal coherence thomson scattering diagnosis by only adjusting the aperture limiting diaphragm 5 and the half-zone attenuation sheet 10. The light receiving element is a light receiving lens 6, more supporting and adjusting mechanisms are not needed, and the aiming difficulty of the light path is low; the whole measuring system is easy to package and integrate, and is suitable for a large-scale laser device.
The caliber of the aperture limiting diaphragm 5 after the aperture limiting diaphragm is reduced is not more than 40mm. When the aperture of the aperture limiting diaphragm 5 is not larger than 40mm after being reduced, the aperture of the aperture limiting diaphragm 5 is reduced when the thermal coherence thomson scattering diagnosis is carried out, so that the effective F number of the measuring system is 10, and the condition of the thermal coherence thomson scattering diagnosis is met. The caliber of the expanded aperture limiting diaphragm 5 is not smaller than the caliber of the light receiving lens 6. When the hyperthermia coherent Thomson scattering diagnosis is carried out, the light transmission aperture of the aperture limiting diaphragm 5 can be enlarged or the aperture limiting diaphragm 5 can be directly taken down. Since the light receiving lens 6 is installed and the light path thereof needs to be adjusted, the operation of directly replacing the light receiving lens 6 with a different F number is very troublesome. The invention directly adjusts the aperture of the aperture limiting diaphragm 5 or replaces the aperture limiting diaphragm 5 without adjusting the light path, and the operation is simple.
Further, the half-zone attenuation sheet 10 includes a first half zone and a second half zone which are arranged left and right, wherein the transmittance of the first half zone is greater than or equal to 80%, and the transmittance of the second half zone is less than or equal to 10%. When performing thermal coherence thomson scattering diagnosis, the first half of the half-zone attenuator 10 is located on the optical path; when the hyperthermia coherent Thomson scattering diagnosis is carried out, the first half area and the second half area are both positioned on the optical path. In the case of hyperthermia coherent thomson scattering diagnosis, the imaging grating spectrometer 9 performs spectral dispersion on the signal by using a grating to obtain a bimodal spectral signal around 263.3nm. Wherein the stronger peak is a super-thermal coherent Thomson scattering spectrum signal, the weaker peak is a thermal coherent Thomson scattering ion spectrum signal, and the ratio of the intensity of the former to the intensity of the latter is generally more than 100. The super-thermal coherent Thomson scattering spectrum signal is attenuated to a greater extent through the second half region, and the thermal coherent Thomson scattering ion spectrum signal is passed through the first half region, so that the intensities of the super-thermal coherent Thomson scattering spectrum signal and the thermal coherent Thomson scattering ion spectrum signal can be adjusted to a similar extent, and both signals can be recorded.
The invention is not limited to the above-described alternative embodiments, and any person who may derive other various forms of products in the light of the present invention, however, any changes in shape or structure thereof, all falling within the technical solutions defined in the scope of the claims of the present invention, fall within the scope of protection of the present invention.
Claims (6)
1. The multipurpose optical Thomson scattering spectrum measuring system suitable for the large-scale laser device is characterized by comprising target point plasmas (1), protective glass (4), a hole limiting diaphragm (5), a light receiving lens (6), an imaging lens (7), a filter disc combination (8), a grating spectrometer (9), a half-area attenuation sheet (10), an optical fringe camera (11) and a computer (12) which are sequentially arranged, wherein the optical fringe camera (11) is electrically connected with the computer (12), the hole limiting diaphragm (5) and the half-area attenuation sheet (10) are movably installed, and the F number of the light receiving lens (6) is not more than 4; the caliber of the aperture limiting diaphragm (5) after the aperture limiting diaphragm is reduced is not more than 40mm; the caliber of the expanded aperture limiting diaphragm (5) is not smaller than the caliber of the light receiving lens (6); the half-zone attenuation sheet (10) comprises a first half zone and a second half zone which are arranged left and right, wherein the transmittance of the first half zone is more than or equal to 80%, and the transmittance of the second half zone is less than or equal to 10%; when performing thermal coherence thomson scattering diagnosis, a first half area of the half area attenuation sheet (10) is positioned on an optical path; when the hyperthermia coherent Thomson scattering diagnosis is carried out, the first half area and the second half area are both positioned on the optical path.
2. The multipurpose optical thomson scattering spectrometry system for large scale laser apparatus according to claim 1, wherein the probe beam (2) passes through the target plasma (1) when performing thermal coherence thomson scattering diagnosis, and the wavelength of the probe beam (2) is 263.3nm.
3. The multipurpose optical tomson scattering spectrometry system for large scale laser devices according to claim 2, wherein the optical axis of the probe beam (2) is at an angle of 90 ° to the optical axis of the light receiving lens (6).
4. The multipurpose optical thomson scattering spectrometry system for large scale laser apparatus according to claim 1, wherein both the interaction beam (3) and the probe beam (2) pass through the target plasma (1) when performing the hyperthermia coherent thomson scattering diagnosis, the wavelength of the interaction beam (3) is 351.3nm, and the wavelength of the probe beam (2) is 263.3nm.
5. The multipurpose optical tomson scattering spectrometry system for large scale laser device according to claim 4, wherein the optical axes of the interaction beam (3), the probe beam (2) and the light receiving lens (6) are in the same plane, and the optical axis of the interaction beam (3) is located on the angular bisector of the optical axis of the probe beam (2) and the optical axis of the light receiving lens (6).
6. Multipurpose optical tomson scattering spectrometry system for large scale laser devices according to any of claims 1-5, characterized in that the grating spectrometer (9) is an imaging grating spectrometer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110630175.0A CN113507775B (en) | 2021-06-07 | 2021-06-07 | Multipurpose optical Thomson scattering spectrum measuring system suitable for large-scale laser device |
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| CN202110630175.0A CN113507775B (en) | 2021-06-07 | 2021-06-07 | Multipurpose optical Thomson scattering spectrum measuring system suitable for large-scale laser device |
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