Spectrometric measurement of human teeth plasma produced by nanosecond Nd:YAG pulsed laser

Spectroscopic measurements of human teeth plasma parameters are carried out utilizing the fundamental and second harmonics (1064 and 532 nm) of Nd:YAG laser. The laser irradiance ranging from 1.9 to 9.9 × 10⁹ W/cm² was directed on the sample in order to produce plasma. Calcium emission lines have been investigated and utilized to compute the plasma parameters based on experimental findings. We identified laser-induced plasma characteristics such as electron temperature (T_e) using the Boltzmann and the density of electron (N_e) using the two-line ratio method. T_e and N_e values increased as laser energy increased. The estimated range of Te was (10549–24683)K for 1064 nm and (10179–21896)K for 532nm while the range of Ne was (1.26* 1016–6.87*1016) cm⁻³ for 1064 nm (2.2*1016–9.8*1016)cm⁻³ for 532 nm. The variation of other plasma parameter such as Debye length (λ_D/cm), particles number in Debye sphere (N_D/cm³), and plasma frequency (ω_p/Hz) with laser irradiance have also been investigated.