Abstract
The optical emission study of aluminum (Al) plasma generated by a $Q$ -switched Nd:YAG laser has been presented. The plasma parameter, such as electron temperature ( $T_{e}$ ) and electron number density ( $N_{e}$ ), has been estimated. The electron temperature has been estimated by four different methods and $N_{e}$ was estimated by Stark broadening of spectral lines and the Saha–Boltzmann equation. The laser-generated Al plasma was optically thin and also fulfills the conditions of local thermodynamical equilibrium. The emission spectrum used for determination of the branching fraction and thus transition probabilities of all allowed transitions. The measured values are good in agreement with the literature.
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