Spectral Analysis of the Emissions of Carbon Element in the Laser Induced Plasma System

In this work, Laser-induced plasma technique (LIPS) has employed to generate plasma in air at atmospheric pressure from a carbon sample by using a passively Q-switched Nd:YAG laser (334.7mJ, 1064 nm with 9 ns pulse duration, 37MW peak power ,the area of the laser spot was 5.72*10P P cmP P and 6.4*10P PMw/cmP P the power intensity). optical spectrum analyzer with 150 pm optical resolution for spectrum range (320 nm 740 nm), was used to detect and analyze plasma emission lines of the carbon element and study the plasma properties . The line emission spectra of carbon plasma that have been detected by using a spectrum analyzer (Thorlabs GmbH), have been used to extract the excited plasma temperature via the Boltzmann equation, and measure the electron number density by McWhirter criterion ,where the plasma temperature measured is (6955.001 k) and the electron density NReR= 2.259*10P PcmP P at the fundamental wavelength.