Laser Induced Breakdown Spectroscopic (LIBS)technique was used to detect calcium and silicon in an unknown sample.In this method plasma was generated by Nd:YAG laser of wavelength 1064 nm with energy 400 mJ and pulse duration between 5 ~ 10 ns.The method was applied for the qualitative as well as quantitative analysis.In the qualitative analysis,the electron number density (Ne )of plasma containing calcium and silicon is determined showing that Ne of neutral particles is equivalent to 1016 (cm-3 )whereas for ionized particles it is 1017 (cm-3 ).Plasma temperature is measured using Boltzmann plot method which must be greater than 10000 k.Intensity ratio method is used for the quantitative analysis shows various elements in abundance with calcium and silicon in majority.
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