This study assesses the optical properties, both linear and nonlinear, of high entropy materials (La2O3 + TiO2 + Nb2O5 + WO3 + X2O3, represented as LTNWX where X = B, Ga, and In) synthesized via aerodynamic containerless processing, as referenced in Ref [27]. The optical parameters were determined using established mathematical formulations. The molar refractivity values are 12.50 cm3/mol for LTNWB, 13.79 cm3/mol for LTNWGa, and 16.06 cm3/mol for LTNWIn. Electronic polarizability values were calculated to be 4.956 \(\times {10}^{-24}\) , 5.467 \(\times {10}^{-24}\) , and 6.369 \(\times {10}^{-24}\) for LTNWB, LTNWGa, and LTNWIn, respectively. Reflection loss values were found to be 0.131, 0.139, and 0.178 for LTNWB, LTNWGa, and LTNWIn, respectively. Metallization values were measured at 0.455, 0.441, and 0.372 for LTNWB, LTNWGa, and LTNWIn, respectively. Additionally, the transmission coefficients for LTNWB, LTNWGa, and LTNWIn were 0.767, 0.755, and 0.697, respectively. Notably, the glass with X = In exhibited the highest Nonlinear optical susceptibility (4.439 \(\times {10}^{-12}\) esu) and a low Optical electronegativity (0.746). The nonlinear refraction index values were determined to be 1.971 \(\times {10}^{-11}\) esu for LTNWB, 2.436 \(\times {10}^{-11}\) esu for LTNWGa, and 2.436 \(\times {10}^{-11}\) esu for LTNWIn. Overall, the results suggest that LTNWIn is particularly well-suited for optical applications.
