Fig. 1. The basic principle of the modified laser-induced fluorescence-dip spectroscopy method

Fig. 2. Schematic diagram of three-level distribution for xenon with two-photon excitation and ionization effect

Fig. 3. The relationship between ionization ratio and laser power density

Fig. 4. Potential distributions between plane electrodes

Fig. 5. Schematic diagram of experimental set-up for the modified-LIF-DIP diagnostics

Fig. 6. The sketch of measurement chamber of laser-induced fluorescence-dip optical diagnosis

Fig. 7. Fluorescence dip signal distribution when the laser power density is 10 MW/cm²

Fig. 8. Fluorescence dip signal distribution when the laser power density is 5 MW/cm²

Fig. 9. Resonant wavelength comparison of fluorescence dip signal in 2 kV/cm and 0 kV/cm when the laser power density is 5 MW/cm²