Method and system for measuring plasma parameters of femtosecond laser-induced gas ionization
A kind of plasma and femtosecond laser technology, applied in the direction of plasma, greenhouse gas reduction, general control system, etc., can solve the problem of not being able to accurately obtain the dynamic evolution of plasma parameters, so as to save measurement time, reduce measurement errors, and improve The effect of parameter acquisition speed
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Embodiment 1
[0040] A method for measuring plasma parameters of femtosecond laser-induced gas ionization, such as figure 1 shown, including the following steps:
[0041] S1. Use the picosecond laser as the probe light to detect the dynamic evolution process of the plasma obtained by femtosecond laser-induced gas ionization, and obtain the diffraction spectrum I of the plasma meas (ω,r); where, ω is the frequency scale of the diffraction spectrum, corresponding to the horizontal axis in the diffraction spectrum image; r is the spatial scale of the diffraction spectrum, corresponding to the vertical axis in the diffraction spectrum image; the picosecond laser is a linear chirped pulse ;
[0042] It should be noted that the present invention is applicable to plasmas obtained by femtosecond laser-induced ionization of gases such as air, helium, oxygen, and mixed gases; the above-mentioned gases include not only single gases such as air, helium, and oxygen, but also mixed gases.
[0043] Spec...
Embodiment 2
[0078] A system for measuring plasma parameters of femtosecond laser-induced gas ionization, comprising:
[0079] The diffraction spectrum acquisition module is used to detect the dynamic evolution process of the plasma obtained by the femtosecond laser-induced gas ionization by using the picosecond laser as the probe light, and obtain the diffraction spectrum I of the plasma meas (ω,r); where, ω is the frequency scale of the diffraction spectrum, r is the spatial scale of the diffraction spectrum; the picosecond laser is a linear chirped pulse;
[0080] Diffraction model building blocks for building diffraction models based on Fraunhofer and Fresnel diffraction theories To characterize the plasma radius r p , detecting light phase shift The physical mapping relationship between the frequency scale ω and the spatial scale r of the diffraction spectrum;
[0081] Plasma Radius Calculation Module, for use from Diffraction Spectrum I meas Randomly select a frequency scale ω ...
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