| Citation: | WANG Zhen, LV Ri-yi, LI Chao, CHEN Jun-feng, ZHANG Man. Calculation and experiment of tiny perturbations in electric field measurement for the Laser-induced fluorescence-dip spectroscopy method[J]. Chinese Optics. doi: 10.37188/CO.2024-0037
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In order to realize the industrial application of high-current pulsed electron beam on material surface modification, real-time tiny perturbation monitoring of the electron beam action process is needed. The electric field strength is one of the key parameters to reflect the characteristics of electron beam. The laser induced fluorescence-dip spectroscopy method based on Stark effect can realize the tiny perturbation measurement of electric field. Therefore, study the influence of laser power density on the electric field has important theoretical and application value for the parameter setting and result interpretation of similar electric field measurement methods.
By the theoretical analysis and calculation, the relationship model between excitation laser power density and the parameters of the test environment in the tiny perturbation state of electric field measurement is obtained; Then, based on the above relationship model and theoretical calculation, the influence of excitation laser power density on electric field measurement is verified experimentally.
The experimental results show that under the conditions that the tracer gas xenon pressure is 1.0×10-4 mbar and the electric field strength is 2 kV/cm or below, the excitation laser power density of tiny perturbations on the electric field measurement is 5 MW/cm2, which is basically consistent with the theoretical calculation value.
The research results provides the quantitative analysis method of the influence of laser power density on electric field in the laser induced fluorescence-dip spectroscopy method, and can be applied in the same kind of electric field measurement methods, providing the way for the setting of laser power density and experimental parameters, support the development of electric field measurement experiments, and effectively improve the accuracy of electric field measurement.
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