Research progress of electric field induced second harmonic in atmospheric pressure non-equilibrium plasma
The electric-field-induced second-harmonic(E-FISH),as a non-invasive measurement method with high time resolution of nanosecond or even femtosecond,has received extensive attention in the diagnosis field of non-equilibrium plasma at atmospheric pressure.Based on the principle of second harmonic generation,the applicability of E-FISH was discussed.According to the characteristics of nanosecond and femtosecond lasers in this application,the corresponding diagnostic system was built.A higher temporal resolution was obtained by using nanosecond laser to measure the electric field.The system was calibrated by the uniform electric field generated by parallel plate electrodes,and the quantitative relationship between the second harmonic signal intensity and the square of the electric field intensity was obtained.Meanwhile,the transient electric fields at different positions of the atmospheric pressure plasma were obtained based on the quantitative relationship.
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