Spectroscopic Diagnostics of Plasma parameter in Laser Induced Plasma using PbO Lines

pulse laser, where the effect of laser energy at a wavelength of 1064nm was studied on lead oxide that produced by optical emission spectroscopy at different laser energy from 500 to 900 mJ. It was found that the intensity for Pb I and Pb II lines increase with increasing laser energy, but with different ratio, as a result increasing the excitation rate with increasing the number of falling photons. The wave length was recorded at highest laser Energy produced from Pb II which was equal to 666.02 nm. It can be seen that The height of peaks increase with increasing laser energy due to the effect of increasing the Electrical field induced by increasing Electrons density and the temperature of electron (Te) and electron density (ne) increase from 1.222×10 18 cm -3 to 1.444×10 18 cm -3 with increasing laser energy from 500 to 900 mJ respectively as a result of increasing number of falling photons which lead to increase in the electron density. Introduction The objective of plasma diagnostics is to obtain the information about the state of plasma by means of experimental analysis of the physical processes occurring in it. The knowledge of plasma parameters is required to fully understand the effects of the physical processes taking place in the plasma and to deduce from them its properties [1,2]. Optical emission spectroscopy is widely used, due to its simplicity, to measure plasma parameters such as electron temperature (Te) and electron density (ne). Wavelength of emitted light depends on energy difference between levels. While the intensity, depending on Boltzmann distribution for local thermal equilibrium and the intensity can be described as[3].