In this work, we compare plasma characteristics when a pulsed Nd:YAG laser is focused at 532 nm and 1064 nm on the titanium target. At laser energies of 500 mJ and 700 mJ the plasma is measured by optical emission spectroscopy. Many plasma parameters including the temperature (calculated using Boltzmann plot) and electron density (calculated using Stark-broadened line profiles) will be obtained from the spectral lines of neutral titanium (i.e. Ti I). Some factors for Debye length (λD) and Debye number (ND) have also been determined using the same laser spectroscopy in this paper. The 532 nm wavelength results in a higher electron density and plasma frequency, and the improved ionization efficiency is likely due to the increased photon energy. By contrast, at a 1064 nm wavelength, the electron temperature (Te) is higher, λD is longer, and the number of particles within the Debye sphere (ND) is greater due to more effective inverse bremsstrahlung absorption and thermal heating. The statistical measurements indicate that these differences and the observed wavelength variations depend strongly on the plasma's ionization parameters, and that 1064 nm shows higher thermal and collective plasma properties.
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