Study of characteristic parameters of laser-induced coin plasma

The coin plasma is produced by focusing the 1064 nm Q-switched Nd : YAG laser. The plasma temperature 28144 K is inferred using the improved iterative Boltzmann plot method with nine Ni lines (225.47 nm, 303.19 nm, 304.50 nm, 323.30 nm, 339.29 nm, 491.84 nm, 495.32 nm, 500.03 nm, 501.76 nm). The electron number density 8.6 × 10¹⁷ cm^-3 is obtained from the Stark broadening of Ni I 341.48 nm. Based on the experimental results, the laser-induced coin plasma is verified to be in local thermodynamic equilibrium. (authors)