Plasma characteristics of Ag:Al alloy produced by fundamental and second harmonic frequencies of Nd:YAG laser

Ali A-K Hussain

doi:10.30723/ijp.v14i31.188

Abstract

In this work, the spectra for plasma glow produced by pulseNd:YAG laser (λ=532 and 1064nm) on Ag:Al alloy with same molarratio samples in distilled water were analyzed by studying the atomiclines compared with aluminum and silver strong standard lines. Theeffect of laser energies of the range 300 to 800 mJ on spectral lines,produced by laser ablation, were investigated using opticalspectroscopy. The electron temperature was found to be increasedfrom 1.698 to 1.899 eV, while the electron density decreased from2.247×1015 to 5.08×1014 cm-3 with increasing laser energy from 300to 800 mJ with wavelength of 1064 nm. The values of electrontemperature using second harmonic frequency are greater than of1064 nm, which increased from 2.405 to 2.444 eV, while the electrondensity decreased from 2.210×1015 to 1.516×1015 cm-3 withincreasing laser energy for the same energy range.

Highlights

Plasma diagnostics are used to obtain information about the nature of plasma, such as the chemical compositions and species of the plasma, density of the plasma, electron temperature [1]
The optical emission spectra of Ag:Al plasma in distilled water were recorded by using optical emission spectroscopy technique with 1064 nm Nd-YAG laser
The value of Te is obtained from the Boltzmann plot method, as shown in Fig. 2, from the analysis of the nine recorded Ag II lines for plasma induced on Ag:Al alloy in distilled water using 1064 nm laser, at different laser energies 300, 400, 500, 600, 700 and 800 mJ

Summary

Introduction

Plasma diagnostics are used to obtain information about the nature of plasma, such as the chemical compositions and species of the plasma, density of the plasma, electron temperature [1]. Pulsed laser-induced plasmas of metals and alloys have more interest as they used in several applications such as synthesize of Nano-particles [2] investigation on elemental content [3] spectroscopic studies [4]. Light emitted in a wide range for spectroscopic analysis from the plasma generated by high- power laser pulses were detected and the. A spectrum often consists of a number of characteristic spectral lines of a particular atom or ion [5]. The electron temperature of plasma was calculated using Boltzmann relation [6]: Ln. where λmn, Imn, gm, and Amn are the wavelength, intensity, statistical weight, and transition probability between the transition states of upper level (m) and lower level (n), respectively. The electron density was calculated using Saha-Boltzmann equation for atom and ion spectral lines emitted from the plasma [7]: ne =

IjIkI AmngmI

ND ne

Results and discussion

Conclusions