Effect of Laser Energy and Vacuum Pressure on the Laser induce Plasma from Titanium Target

Abstract

In this study, the effect of laser energy and vacuum pressure in Argon of laser induced spectroscopy from titanium target on the plasma emission and plasma parameter. The plasma was induced by Q-switched nanosecond Nd: YAG laser at three different energies (200, 300, 400 mJ). The laser induced plasma was applied in a vacuum chamber at different Ar pressures of 0.08, 0.2, and 0.4 Torr. The atomic and ionic emission lines increased in intensity directly with the laser energy. The plasma temperature determined according to Boltzmann-Plot, and the electron density (n_e) determined according to Saha-Boltzmann equation were increased with the laser energy. From the other hand, the T_e decreased with increasing the pressure as a result of increasing electron-atom collisions. The n_e increased with increasing the pressure from 0.08 to 0.2 and reduced at 0.4 Torr. The plasma parameters in Ar at different vacuum pressures from the Ti target at different laser energies were satisfied the plasma criteria.