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Multi-pulse induced spectrum method and device based on femtosecond plasma grating

A technology for plasma and plasmoids, which is applied in the field of multi-pulse induced spectroscopy methods and devices, can solve the problems that the excitation effect needs to be improved, the cost is high, and is disadvantageous, so as to overcome the plasma shielding effect and the matrix effect, improve the signal strength, The effect of improving the signal-to-noise ratio

Pending Publication Date: 2022-01-21
CHONGQING INST OF EAST CHINA NORMAL UNIV +6
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Although the nanosecond pulse has a good heating effect, the plasma generated by the excited sample will have a strong background line in the early stage, which is not conducive to analysis
The optical filament formed by femtosecond pulse focusing has a power clamping effect. As the laser power increases, its power density and electron density are difficult to break through, so its excitation effect on the sample needs to be improved.
In addition, the two pulse widths require femtosecond lasers and nanosecond lasers, which is not conducive to the development of integrated equipment, and has the disadvantage of high cost, which is not the optimal solution in some practical situations.

Method used

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  • Multi-pulse induced spectrum method and device based on femtosecond plasma grating
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  • Multi-pulse induced spectrum method and device based on femtosecond plasma grating

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Embodiment 1

[0041] Such as figure 1 Shown is a schematic diagram of the femtosecond plasmonic grating-based multi-pulse induced spectroscopy method. Pulse A in the figure is used to form a one-dimensional or multi-dimensional femtosecond plasma grating to excite the sample. Pulse B and pulse C are incident on the sample surface as post-pulse intervals with a delay. Specifically, there may be multiple post-pulses, which may be femtosecond pulses, picosecond pulses, or femtosecond plasma gratings, and frequency-doubled light may be used to form a two-color field to excite the sample. The angle between the incident direction of the post pulse and the femtosecond plasma grating is α and β, and the α and β are one or more of the first-order or higher-order Bragg angles. After the post-pulse is coupled with the plasma grating, the power density and electron density in the plasma grating channel are increased, and the length of the plasma channel is increased to effectively improve the detecti...

Embodiment 2

[0045] One way of forming the femtosecond plasmon grating is based on the focusing of an array lens. The specific schematic diagram of the focusing principle of the array lens is as follows: image 3 shown. The array lens is composed of sub-lenses with a diameter of several hundred nanometers to several millimeters arranged in a certain order on the substrate. Each sub-lens has a unique optical axis, and the entire array of lenses as a whole has a main optical axis. Each sub-lens Optical signals can be transmitted independently of each other without interfering with each other. When a beam of femtosecond laser is incident, the array lens splits the incident beam into many small units, and the energy of each unit can be approximated as uniform distribution. It can form a grating periodic structure after focusing with a common focusing lens.

Embodiment 3

[0047] Another way to form the femtosecond plasma grating is to split the beams, and then use multiple femtosecond laser beams to interact to form the femtosecond plasma grating after synchronization. For better illustration, the present invention provides a multi-pulse induced spectroscopy device based on femtosecond plasmon grating, the implementation of which is as follows Figure 4 shown. The femtosecond laser generates a beam of pulsed laser light with a wavelength of 800nm, a repetition rate of 1kHz, and a pulse width of 50fs. Then after passing through the beam splitter A, the primary transmitted light and the primary reflected light (pulse 1) are formed, and the primary transmitted light passes through the beam splitter B to form the secondary transmitted light (pulse 2) and the secondary reflected light (pulse 3). Pulse 1 light is converged by lens A after passing through delay line 1 (composed of high reflection mirror A-C and stepping motor A), and pulse 2 is conv...

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Abstract

The invention discloses a multi-pulse induced spectrum method and device based on a femtosecond plasma grating. The method comprises the following steps: firstly, exciting a sample based on a femtosecond plasma grating, after a period of time delay, additionally setting a multi-beam pulse combination for incidence relative to the plasma grating at a first-order or high-order Bragg angle, coupling with the previous femtosecond plasma grating, exciting the sample to generate a plasma group, and then carrying out spectral analysis, wherein the post pulse can be one of a picosecond pulse combination, a femtosecond filament combination or a femtosecond plasma grating. According to the method, the advantages of high power density and electron density of the femtosecond plasma grating are utilized, and the femtosecond plasma grating is coupled with post-pulse to excite a sample. Therefore, the method can effectively improve the excitation effect, improve the detection sensitivity and overcome the matrix effect, and meanwhile, the length of a plasma grating channel can be effectively increased, so that fluctuation of spectral line signals is reduced, the detection stability is improved, and popularization and application of the double-pulse LIBS device are facilitated.

Description

technical field [0001] This patent relates to a spectral detection and analysis method, specifically a femtosecond plasma grating-based multi-pulse induced spectroscopy method and device. Background technique [0002] Laser-induced breakdown spectroscopy is a material component analysis technology based on atomic emission spectroscopy. It uses high-energy short laser pulses to focus and irradiate the sample surface to excite and ionize the sample to generate plasma. The position and intensity of the characteristic lines in the spectrum can be used to determine the element composition and element concentration in the sample. Laser-induced breakdown spectroscopy has incomparable advantages such as rapidity, non-contact, no need for sample preparation, and in-situ analysis. Therefore, it has become a research hotspot in the field of spectroscopy and has been applied in many fields. With the development of technology, the requirements and standards for laser-induced breakdown s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/71G01N21/01
CPCG01N21/71G01N21/01G01J3/1809G01N21/718G02B27/1006G01J3/443
Inventor 曾和平施沈城胡梦云
Owner CHONGQING INST OF EAST CHINA NORMAL UNIV
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