CN117705735A - Plasma supercontinuum white light nanosecond laser photolysis measurement system - Google Patents
Plasma supercontinuum white light nanosecond laser photolysis measurement system Download PDFInfo
- Publication number
- CN117705735A CN117705735A CN202311680484.4A CN202311680484A CN117705735A CN 117705735 A CN117705735 A CN 117705735A CN 202311680484 A CN202311680484 A CN 202311680484A CN 117705735 A CN117705735 A CN 117705735A
- Authority
- CN
- China
- Prior art keywords
- white light
- nanosecond
- plasma
- laser
- supercontinuum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005259 measurement Methods 0.000 title claims abstract description 21
- 238000006303 photolysis reaction Methods 0.000 title claims abstract description 21
- 230000015843 photosynthesis, light reaction Effects 0.000 title claims abstract description 21
- 238000005086 pumping Methods 0.000 claims abstract description 40
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 32
- 239000000956 alloy Substances 0.000 claims abstract description 32
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 239000013077 target material Substances 0.000 claims abstract description 17
- 238000001228 spectrum Methods 0.000 claims description 24
- 239000013307 optical fiber Substances 0.000 claims description 19
- 230000003287 optical effect Effects 0.000 claims description 12
- 230000005281 excited state Effects 0.000 claims description 7
- 239000010453 quartz Substances 0.000 claims description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052724 xenon Inorganic materials 0.000 abstract description 11
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 abstract description 11
- 101000694017 Homo sapiens Sodium channel protein type 5 subunit alpha Proteins 0.000 abstract description 4
- 238000004458 analytical method Methods 0.000 abstract description 2
- 230000005284 excitation Effects 0.000 abstract 1
- 239000000523 sample Substances 0.000 description 47
- 238000000862 absorption spectrum Methods 0.000 description 11
- 230000001052 transient effect Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Natural products CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000003473 flash photolysis reaction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003595 spectral effect Effects 0.000 description 3
- 229910000851 Alloy steel Inorganic materials 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002159 nanocrystal Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 125000003944 tolyl group Chemical group 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000001307 laser spectroscopy Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The invention discloses a plasma super-continuous white light nanosecond laser photolysis measurement system, which comprises: two nanosecond laser pumping sources, one of which outputs a short-wavelength light beam for pumping and exciting a sample to be detected, and the other of which outputs a laser light source for ablating and puncturing an alloy target material, wherein the generated plasma supercontinuum white light is used as a detection light source, and the target material is arranged on a moving platform which continuously and stably moves in order to ensure stable supercontinuum output; the generated plasma supercontinuum white light acts on the sample after being focused by the lens, passes through the sample at an angle of 90 degrees on the same horizontal plane with the excitation light beam, is collected by the spectrometer after being focused by the lens, and realizes time resolution delay control on the detected white light by the aid of the digital signal delay device. The invention realizes the generation of self-grinding plasma super-continuous white light, nanosecond laser photolysis analysis, simplification of a measurement mode, and replaces a xenon lamp and expensive PMT/ICCD combination to realize nanosecond time resolution.
Description
Technical Field
The invention belongs to the technical field of time resolution laser spectrum, and particularly relates to a plasma super-continuous white light nanosecond laser photolysis measurement system.
Background
Time-resolved laser spectroscopy is one of the high-resolution spectroscopy techniques that has been widely used to explore transients generated in light-substance interactions, such as determining excited state lifetimes and studying relaxation processes of atoms, molecules, and ions in gas, liquid, and solid phases, due to its ultra-high time resolution resulting from ultra-short laser pulses. With the continuous progress of ultra-short ultra-strong laser technology, modern time-resolved spectroscopic technology has been developed rapidly, and scientists have utilized ultra-short pulse lasers for studying the formation and breaking process of chemical bonds in chemical reactions, which was originally reported by the professor Ahmed Zewail of the national academy of california (j. Phys. Chem. (1987), 87,2395), and thus obtained the 1999 nobel chemical prize, currently, time-resolved spectroscopic technology based on ultra-short ultra-fast laser technology can cover attoses to seconds on a time scale, and the spectral range to ultraviolet to terahertz. The nanosecond laser flash photolysis spectrometer is a time resolution spectrometer based on nanosecond laser, is commonly used in the basic research fields of physics, chemistry, biology, material science and the like, and is one of laser spectrum technologies based on a pump-detection principle. In general, a pump pulse (Nd: YAG 355nm or pump light required for combined OPO generation) excites a sample, transient substances such as short-life new products of an excited state, a free radical intermediate, an exciton and the like are generated in the sample, and during the relaxation back to a ground state, detection light with a certain time delay passes through the excited state position, so that the detection light is recorded as a spectrum form changing with time. Probe light in flash photolysis spectrometers typically uses a xenon lamp light source to monitor the change in absorption spectrum over time, with the result being referred to as Transient Absorption (TA).
The xenon lamp is used as a detection light source of a mature nanosecond laser flash photolyzer, commercial application (such as Edinburgh instrument LP920 and the like) is realized, but the whole set of equipment has obvious weaknesses, and firstly, the equipment can realize time-resolved spectrum detection by combining the xenon lamp detection light source with a relatively expensive PMT/ICCD detector; secondly, the xenon lamp has serious white light stroboscopic effect, the spectrum coverage is mainly concentrated in the visible light range of 400-800nm, and the detection capability of the ultraviolet region below 400nm and the near infrared region of 800-1600nm is poor.
Therefore, how to provide a plasma supercontinuum white light which can replace a xenon lamp, is simple and has controllable spectral range, and to realize laser flash photolysis analysis based on the plasma supercontinuum white light becomes a technical problem to be solved.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a plasma supercontinuum white light nanosecond laser photolysis measurement system.
The technical problems to be solved by the invention are realized by the following technical scheme:
the invention provides a plasma super-continuous white light nanosecond laser photolysis measurement system, which comprises:
a first nanosecond pump source for generating a first pump laser;
a second nanosecond pump source for generating a second pump laser that irradiates the sample cell; the wavelength of the first pump laser is larger than that of the second pump laser;
the alloy target is positioned on the moving platform and moves at a uniform speed along with the moving platform in a reciprocating manner;
the lens group is used for focusing the first pumping laser to the alloy target material to generate plasma supercontinuum white light;
a first lens for controlling a spot diameter and an incident angle of the plasma supercontinuum white light entering the sample cell;
the optical fiber spectrum acquisition equipment is used for collecting detection white light carrying excited state relaxation information;
a second lens for focusing the plasma supercontinuum white light transmitted through the sample cell to the optical fiber spectrum acquisition device;
and the digital signal delayer is used for respectively controlling the working time of the first nanosecond pumping source, the second nanosecond pumping source and the optical fiber spectrum acquisition equipment.
In some embodiments, the lens group includes: a reflecting mirror and a focusing lens;
the reflecting mirror is used for reflecting the first pumping laser to the focusing lens;
the focusing lens is used for focusing the reflected first pump laser to the alloy target material to generate plasma supercontinuum white light.
In some embodiments, the focusing lens is specifically configured to control a diameter range of a contact surface between the focused first pump laser and the alloy target to be 5-10mm.
In some embodiments, the first lens is specifically configured to control a spot diameter of the plasma supercontinuum white light entering the sample cell to be in a range of 5-10mm, and simultaneously control the plasma supercontinuum white light entering the sample cell and the second pump laser entering the sample cell to overlap in a manner of intersecting at 90 degrees on the same plane.
In some embodiments, the alloy target has a thickness of 5mm or more.
In some embodiments, the optical path propagation distance from the first nanosecond pump source to the sample cell is the same as the optical path propagation distance from the second nanosecond pump source to the sample cell, and the time delay between the first pump laser and the second pump laser is >10ns.
In some embodiments, the first pump laser has a wavelength of 1064nm and the second pump laser has a wavelength of 355nm.
In some embodiments, the output energy of the first nanosecond pump source and the second nanosecond pump source is adjustable, wherein the output energy of the first nanosecond pump source is greater than 50mJ and the beam divergence angle is less than 1mrad; the output energy of the second nanosecond pumping source ranges from 1 mJ to 100mJ, and the beam divergence angle is smaller than 1mrad.
In some embodiments, the sample cell is a four-way quartz cuvette with a size of 1 cm.
Compared with the prior art, the invention has the beneficial effects that:
in the plasma supercontinuum white light nanosecond laser photolysis measurement system provided by the invention, the first pumping laser emitted by the first nanosecond pumping source is gathered on the alloy target material which moves at a uniform speed and reciprocates after passing through the lens group, so that stable plasma supercontinuum white light is generated, wherein the intensity of the generated plasma supercontinuum white light can be controlled by changing the lens used for focusing in the lens group, and the wavelength range of the generated plasma supercontinuum white light can be controlled by changing the material of the alloy target material, so that the plasma supercontinuum white light which has stable energy, controllable wavelength coverage and controllable intensity and can replace a xenon lamp as a detection light source can be generated; on the basis, the system also takes the plasma supercontinuum white light as a detection light source, and completes the acquisition of time-resolved nanosecond transient absorption signals by using a second nanosecond pumping source, fiber spectrum acquisition equipment and a digital signal delayer. Compared with the conventional xenon lamp and PMT/ICCD system, the invention realizes controllable cost, and the stability and spectrum coverage of the detection white light are adjustable. The invention has the advantages of high practicality, simple and universal structure, high stability, high degree of autonomy and the like, provides an original scheme for an autonomous scientific research instrument prototype machine, can be widely applied to the fields of basic research, new material creation, medical equipment and the like, and has wide application prospect and commercial value.
The present invention will be described in further detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of an exemplary plasma supercontinuum white light nanosecond laser photolysis measurement system provided by embodiments of the present invention;
FIG. 2 is a schematic diagram of exemplary plasma supercontinuum white light provided by embodiments of the present invention;
fig. 3 is a schematic diagram of transient absorption spectra of an exemplary perovskite nanocrystalline liquid sample provided by an embodiment of the invention.
Detailed Description
The present invention will be described in further detail with reference to specific examples, but embodiments of the present invention are not limited thereto.
The embodiment of the invention provides a plasma super-continuous white light nanosecond laser photolysis measurement system, which comprises: the system comprises a first nanosecond pumping source, a second nanosecond pumping source, a moving platform, an alloy target, a lens group, a first lens, a sample cell, optical fiber spectrum acquisition equipment, a second lens and a digital signal retarder. The first nanosecond pump source is used for generating first pump laser. The second nanosecond pumping source is used for generating second pumping laser for irradiating the sample cell; the wavelength of the first pump laser is greater than the wavelength of the second pump laser. The alloy target is positioned on the moving platform and moves back and forth at a constant speed along with the moving platform. The lens group is used for focusing the first pumping laser to the alloy target material to generate plasma super-continuous white light. The first lens is used for controlling the spot diameter and the incidence angle of the plasma super-continuous white light entering the sample cell. The optical fiber spectrum acquisition device is used for collecting detection white light carrying excited state relaxation information. And the second lens is used for focusing the plasma supercontinuum white light transmitted through the sample cell to the optical fiber spectrum acquisition equipment. And the digital signal delayer is used for respectively controlling the working time of the first nanosecond pumping source, the second nanosecond pumping source and the optical fiber spectrum acquisition equipment.
In the embodiment of the invention, the wavelength of the first pump laser is 1064nm, and the wavelength of the second pump laser is 355nm. The output energy of the first nanosecond pumping source and the second nanosecond pumping source is adjustable; illustratively, the first nanosecond pump source and the second nanosecond pump source are nanosecond lasers, and the maximum output energy of the nanosecond lasers can reach 300mJ; therefore, the intensity of the output pump light can be improved by adjusting the output energy of the pump source so as to optimize the intensity of the generated plasma supercontinuum white light, thereby obtaining higher absorption spectrum difference.
In some embodiments, the output energy of the first nanosecond pump source is greater than 50mJ and the beam divergence angle is less than 1mrad; the output energy of the second nanosecond pumping source ranges from 1 mJ to 100mJ, the beam divergence angle is smaller than 1mrad, the repetition frequency of the first nanosecond pumping source and the repetition frequency of the first nanosecond pumping source are both 1 Hz to 10Hz, and the repetition frequency is adjustable. The output energy of the second nanosecond pump source may be, for example, 10mJ.
In this embodiment of the present application, the optical path propagation distance from the first nanosecond pump source to the sample cell is the same as the optical path propagation distance from the second nanosecond pump source to the sample cell, that is, the optical path propagation distance from the first pump laser after being emitted from the first nanosecond pump source until the section where the plasma supercontinuum light is generated and enters the sample cell is L, and the optical path propagation distance from the section where the second pump laser after being emitted from the second nanosecond pump source enters the sample cell is also L, where L is greater than 0. Illustratively, L.ltoreq.1m, thus, not only ensuring that the difference in absorption spectrum of the sample is obtained, but also reducing the propagation loss of light, and also reducing the construction cost of the system.
In the invention, on the basis that the optical path propagation distance from the first nanosecond pumping source to the sample cell is the same as the optical path propagation distance from the second nanosecond pumping source to the sample cell, the time delay between the first pumping laser and the second pumping laser is more than 10ns, and the time delay is controlled by a digital signal delay, for example, the digital signal delay can control the time delay to be 10ns and 30ns so as to respectively measure the delayed absorption spectrums with the time delays of 10ns and 30 ns.
According to the embodiment of the invention, the alloy target material moves back and forth on the moving platform at a uniform speed, so that the problem of plasma output attenuation caused by long-time irradiation of the first pump laser on the same position of the alloy target material can be avoided, stable and continuous plasma supercontinuum white light output can be brought, the white light stability during data acquisition in different delay time is ensured, and the acquisition efficiency of transient absorption difference spectrum is improved.
In the embodiment of the invention, the lens group comprises a lens used for focusing light, and the intensity of the generated plasma supercontinuum white light is related to the quantity of light focused on the alloy target material, so that the intensity of the generated plasma supercontinuum white light can be controlled by changing the lens used for focusing the light. The number and types of the specific lenses included in the lens group are not limited, and can be selected according to actual needs, so long as the first pump laser can be focused on the alloy target. For example, the lens group may include: a reflecting mirror and a focusing lens; the reflector is used for reflecting the first pumping laser to the focusing lens; the focusing lens is used for focusing the reflected first pump laser to the alloy target material to generate plasma supercontinuum white light.
In some embodiments, the lens used for focusing the light in the lens group is specifically used for controlling the diameter range of the contact surface between the focused first pump laser and the alloy target to be 5-10mm, so that the energy of the generated plasma supercontinuum white light can be stabilized.
In the embodiment of the invention, the wavelength coverage of the generated plasma supercontinuum white light is related to the material of the alloy target, and the wavelength coverage of the plasma supercontinuum white light required to be generated can be selected by changing the material of the alloy target. For example, to ensure that the conventional ultraviolet-visible region outputs stable plasma white light, an alloy target with stable and efficient laser-induced plasma output can be selected, and the thickness of the alloy target should be >5mm. The alloy target may be, for example, an alloy steel.
In the embodiment of the invention, the first lens is used for controlling the spot diameter and the incidence angle of the plasma super-continuous white light entering the sample cell so as to form a better detection light beam, thereby better realizing the overlapping with the second pumping laser. The specific composition of the first lens can be set according to actual needs. For example, the first lens may be a focusing lens to focus the generated plasma supercontinuum white light, reduce scattering of the plasma supercontinuum white light, and allow the focused plasma supercontinuum white light to enter the sample cell. In some embodiments, the first lens is specifically configured to control a diameter of a light spot of the super-continuum white light of the plasma entering the sample cell to be 5-10mm, and simultaneously control the super-continuum white light of the plasma entering the sample cell and the second pump laser entering the sample cell to overlap in a manner of intersecting at 90 degrees on the same plane, so that the purpose of collecting the information of the excited intermediate can be achieved.
In the embodiment of the invention, the second lens is used for focusing the plasma supercontinuum white light which is transmitted through the sample cell, so that the plasma supercontinuum white light enters the optical fiber spectrum acquisition equipment to the greatest extent. The specific composition of the first lens can be set according to actual needs. For example, the second lens may be a focusing lens.
In the embodiment of the invention, the sample cell and the samples in the sample cell can be set according to actual needs. By way of example, the sample cell may be a four-way quartz cuvette of size 1cm, and the sample is a perovskite nanocrystalline solution (CsPbBr 3), the solvent is toluene, and the average size of the nanocrystals is about 5nm.
In the embodiment of the invention, the optical fiber spectrum acquisition equipment can be a multichannel optical fiber spectrometer or a monochromator. The spectral resolution of the optical fiber spectrum acquisition device should be better than 3nm, and the optical fiber spectrum acquisition device covers the wavelength range of 200-1600 nm. The detection white light transmitted through the sample cell can be acquired by adopting a combination mode of an ultraviolet visible spectrometer and a near infrared spectrometer, so that interference caused by the entering of a scattering optical fiber of a second nanosecond pumping source is avoided.
With the above description, one exemplary block diagram of a plasma supercontinuum white nanosecond laser photolysis measurement system is provided by FIG. 1. As shown in fig. 1, the system includes: a digital signal retarder (DG 645), a Nd-YAG nanosecond laser for generating pump laser with a wavelength of 1064nm, a Nd-YAG nanosecond laser for generating pump laser with a wavelength of 355nm, a reflector, a lens I, an alloy target, a lens II, a sample cell, a mobile platform, a lens III and a multi-channel optical fiber spectrometer; the propagation distance of the optical path from the pumping laser with the wavelength of 1064nm to the section where the generated plasma supercontinuum white light enters the sample cell is L, and the propagation distance of the optical path from the pumping laser with the wavelength of 355nm to the section where the generated plasma supercontinuum white light enters the sample cell is L after the pumping laser with the wavelength of 1064nm exits from the nanosecond laser. As shown in fig. 1, the digital signal retarder generates 1064nm pump laser and 355nm pump laser with a time delay of >10ns by controlling the working time of two nanosecond lasers, on the one hand, the 1064nm pump laser reaches a lens I after being reflected by a reflector, and the lens I focuses the received 1064nm pump laser onto an alloy target material which is positioned on a moving platform and moves stably along with the moving platform, so that plasma supercontinuum white light is generated, the generated plasma supercontinuum white light is transmitted to a lens II, and is focused into a sample cell through the lens II; on the other hand, 355nm pump laser directly irradiates the sample cell; the lens II controls the spot diameter of the plasma supercontinuum white light entering the sample cell, and enables the plasma supercontinuum white light entering the sample cell and the 355nm pump laser to be overlapped in a 90-degree intersection mode on the same plane, so that the purpose of collecting the excited state intermediate information is achieved, then the plasma supercontinuum white light passing through the sample cell is continuously transmitted to the lens III, is focused through the lens III and is collected by the working multichannel optical fiber spectrometer, and therefore the transient absorption spectrum of a sample in the sample cell is obtained, and the working time of the multichannel optical fiber spectrometer is controlled by the digital signal retarder.
In the plasma supercontinuum white light nanosecond laser photolysis measurement system provided by the invention, the first pumping laser emitted by the first nanosecond pumping source is gathered on the alloy target material which moves at a uniform speed and reciprocates after passing through the lens group, so that stable plasma supercontinuum white light is generated, wherein the intensity of the generated plasma supercontinuum white light can be controlled by changing the lens used for focusing in the lens group, and the wavelength range of the generated plasma supercontinuum white light can be controlled by changing the material of the alloy target material, so that the plasma supercontinuum white light which has stable energy, controllable wavelength coverage and controllable intensity and can replace a xenon lamp as a detection light source can be generated; on the basis, the system also takes the plasma supercontinuum white light as a detection light source, and completes the acquisition of time-resolved nanosecond transient absorption signals by using a second nanosecond pumping source, fiber spectrum acquisition equipment and a digital signal delayer. Compared with the conventional xenon lamp and PMT/ICCD system, the invention realizes controllable cost, and the stability and spectrum coverage of the detection white light are adjustable. The invention has the advantages of high practicality, simple and universal structure, high stability, high degree of autonomy and the like, provides an original scheme for an autonomous scientific research instrument prototype machine, can be widely applied to the fields of basic research, new material creation, medical equipment and the like, and has wide application prospect and commercial value.
In order to verify the technical effects of the present invention, several simulation experiment diagrams are provided below.
Fig. 2 is a schematic diagram of the generated plasma supercontinuum white light, which can well cover the visible light region, when an alloy steel block material having a thickness of 5mm and a size of 4×10cm is selected as an alloy target material, as shown in fig. 2. Fig. 3 is a schematic diagram of transient absorption spectra of a sample obtained when the sample employs a perovskite nanocrystalline solution (CsPbBr 3) in which the solvent is toluene, the average size of the nanocrystals is about 5nm, and absorption spectra of delay times of 10ns and 30ns are collected and difference processing is performed between the absorption spectra and the 0 delay absorption spectrum. Obviously, according to fig. 2 and 3, the plasma supercontinuum white light nanosecond laser photolysis measurement system provided by the application can generate the plasma supercontinuum white light which can replace a xenon lamp as a detection light source, and the collection of the time-resolved nanosecond transient absorption spectrum can be realized by using the plasma supercontinuum white light.
It should be noted that the terms "first," "second," and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying a number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.
In the description, the word "comprising" does not exclude other elements or steps, and the "a" or "an" does not exclude a plurality. Some measures are described in mutually different embodiments, but this does not mean that these measures cannot be combined to produce a good effect.
The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.
Claims (9)
1. A plasma supercontinuum white light nanosecond laser photolysis measurement system, the system comprising:
a first nanosecond pump source for generating a first pump laser;
a second nanosecond pump source for generating a second pump laser that irradiates the sample cell; the wavelength of the first pump laser is larger than that of the second pump laser;
the alloy target is positioned on the moving platform and moves at a uniform speed along with the moving platform in a reciprocating manner;
the lens group is used for focusing the first pumping laser to the alloy target material to generate plasma supercontinuum white light;
a first lens for controlling a spot diameter and an incident angle of the plasma supercontinuum white light entering the sample cell;
the optical fiber spectrum acquisition equipment is used for collecting detection white light carrying excited state relaxation information;
a second lens for focusing the plasma supercontinuum white light transmitted through the sample cell to the optical fiber spectrum acquisition device;
and the digital signal delayer is used for respectively controlling the working time of the first nanosecond pumping source, the second nanosecond pumping source and the optical fiber spectrum acquisition equipment.
2. The plasma supercontinuum white light nanosecond laser photolysis measurement system as recited in claim 1, wherein the lens group comprises: a reflecting mirror and a focusing lens;
the reflecting mirror is used for reflecting the first pumping laser to the focusing lens;
the focusing lens is used for focusing the reflected first pump laser to the alloy target material to generate plasma supercontinuum white light.
3. The plasma supercontinuum white light nanosecond laser photolysis measurement system as recited in claim 2, wherein the focusing lens is specifically configured to control a diameter of a contact surface between the focused first pump laser and the alloy target to be in a range of 5-10mm.
4. The system of claim 1, wherein the first lens is specifically configured to control a spot diameter of the plasma supercontinuum white light entering the sample cell to be in a range of 5-10mm, and simultaneously control the plasma supercontinuum white light entering the sample cell to overlap with the second pump laser entering the sample cell at an intersection of 90 degrees on the same plane.
5. The plasma supercontinuum white light nanosecond laser photolysis measurement system as claimed in claim 1, wherein the thickness of the alloy target is not less than 5mm.
6. The plasma supercontinuum white light nanosecond laser photolysis measurement system of claim 1, wherein an optical path propagation distance from the first nanosecond pump source to the sample cell is the same as an optical path propagation distance from the second nanosecond pump source to the sample cell, and wherein a time delay between the first pump laser and the second pump laser is >10ns.
7. The plasma supercontinuum white light nanosecond laser photolysis measurement system as claimed in claim 1, wherein the wavelength of the first pump laser is 1064nm and the wavelength of the second pump laser is 355nm.
8. The plasma supercontinuum white light nanosecond laser photolysis measurement system of claim 1, wherein the output energy of the first nanosecond pump source and the second nanosecond pump source are adjustable, wherein the output energy of the first nanosecond pump source is greater than 50mJ and the beam divergence angle is less than 1mrad; the output energy of the second nanosecond pumping source ranges from 1 mJ to 100mJ, and the beam divergence angle is smaller than 1mrad.
9. The plasma supercontinuum white light nanosecond laser photolysis measurement system as in claim 1 wherein the sample cell is a four-way quartz cuvette of 1cm in size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311680484.4A CN117705735A (en) | 2023-12-07 | 2023-12-07 | Plasma supercontinuum white light nanosecond laser photolysis measurement system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311680484.4A CN117705735A (en) | 2023-12-07 | 2023-12-07 | Plasma supercontinuum white light nanosecond laser photolysis measurement system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117705735A true CN117705735A (en) | 2024-03-15 |
Family
ID=90163222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311680484.4A Pending CN117705735A (en) | 2023-12-07 | 2023-12-07 | Plasma supercontinuum white light nanosecond laser photolysis measurement system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117705735A (en) |
-
2023
- 2023-12-07 CN CN202311680484.4A patent/CN117705735A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Rohwetter et al. | Filament-induced remote surface ablation for long range laser-induced breakdown spectroscopy operation | |
| US7821634B2 (en) | Laser-triggered plasma apparatus for atomic emission spectroscopy | |
| CN103487146B (en) | Ultra wide band stimulated raman spectroscopy microscopic imaging system simple and convenient to use | |
| Asahi et al. | Development of a femtosecond diffuse reflectance spectroscopic system, evaluation of its temporal resolution, and applications to organic powder systems | |
| CN103822908A (en) | Fluorescence, Raman and laser induced atomic emission spectroscopy combined system | |
| CN105675560A (en) | Method for obtaining fluorescence emission spectrum information of single polymer molecule in shearing field | |
| Margetic et al. | Hydrodynamic expansion of a femtosecond laser produced plasma | |
| CN110632038A (en) | Light path time-delay double-pulse LIBS device | |
| JP2001141567A (en) | Infrared spectroscope | |
| US8724111B2 (en) | Flash photolysis system | |
| CN117705735A (en) | Plasma supercontinuum white light nanosecond laser photolysis measurement system | |
| Kovalchuk et al. | Laser-Synchrotron Facility of the National Research Centre “Kurchatov Institute” | |
| JP2004309458A (en) | Time-resolved fluorescence microscope | |
| US11193825B2 (en) | Short pulsewidth high repetition rate nanosecond transient absorption spectrometer | |
| JP4895534B2 (en) | Mid-infrared light-ultraviolet light generator | |
| CN116223481A (en) | Multi-element multi-spectral line spectrum enhanced laser-induced breakdown spectroscopy measurement method | |
| US10474002B2 (en) | Generation of high energy mid-infrared continuum laser pulses | |
| US20070171420A1 (en) | Pulsed ellipsometer device | |
| JP2000055809A (en) | Raman microspectroscope and method therefor | |
| JP4393147B2 (en) | Terahertz electromagnetic wave generating element | |
| CN215525538U (en) | LIBS backscattering collection target detection device | |
| CN209802988U (en) | Multifunctional spectrum system | |
| JP2702047B2 (en) | Time-resolved fluorescence excitation spectrum analyzer | |
| Stratis et al. | Characterization of laser-induced plasmas for fiber optic probes | |
| KR20030054084A (en) | Method of laser-induced plasma atomic emission spectroscopy and apparatus thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |