Abstract
The refractive indices, extinction coefficients, and transmittance of 1 mol% Mn-doped 0.15Pb(In1/2Nb1/2)O3–0.57Pb(Mg1/3Nb2/3)O3–0.28PbTiO3 (Mn-PIN–PMN–PT) relaxor-based single crystal were investigated. The Mn-PIN–PMN–PT single crystal exhibited a rhombohedral to tetragonal phase transition temperature Trt of 120.3 °C and Curie temperature TC of 152.4 °C. The improved Sellmeier equation for the refractive index was determined by least-squares method, which can be applied to calculate accurately the refractive index over a wide wavelength range from 350 to 5000 nm. The Sellmeier optical coefficients were found to be S0 = 1.178 × 1014 m−2, λ0 = 0.215 µm, E0 = 6.06 eV and Ed = 28.73 eV through fitting the single-term oscillator equation. The transmittance reached about 72% over a wide wavelength from 500 nm to 2.5 µm. The optical band-gap energy Eg of 3.34 eV was obtained from absorption coefficient spectra by use of the Tauc model. The results can offer essential parameters of the Mn-PIN–PMN–PT single crystal for optical device applications.
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