Abstract
The temporal evolution of Nd:YAG laser-produced Sn plasma in atmospheric pressures from 5 to 104 Pa is investigated. The results show that the extreme ultraviolet radiation exists only at the beginning of the expansion process for 20 ns. The maximum temperature of 18.7 eV and density of 9.6×1017 cm 3 are measured at 73 ns. The effects of air pressure and laser energy on the process of plasma expansion are investigated. The results indicate that the air pressure has an inhibitory effect on kinetic energy, while the electron density and temperature increase with air pressure.
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