Optical transmission and dispersion of 0.25Pb(In1/2Nb1/2)O3– (0.75 − x) Pb(Mg1/3Nb2/3)O3–xPbTiO3 single crystals

Optical transmission spectra and refractive index dispersions of ternary relaxor-based ferroelectric 0.25Pb(In1/2Nb1/2)O3–(0.75 − x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 [PIMNT0.25/(0.75 − x)/x] single crystals were studied after poled along [001] direction. Sellmeier dispersion equations of the refractive index were obtained by least square fitting, which can be used to calculate the refractive indices in visible and near infrared spectra. The optical transmission of tetragonal PIMNT0.25/0.37/0.38 single crystal is about 70% from 0.5 to 5.8 μm, which is much higher than that of rhombohedral PIMNT0.25/0.45/0.30 and morphotropic phase boundary PIMNT0.25/0.41/0.34 single crystals. Optical interband direct and indirect transitions were investigated by absorption spectra. Our results show that as the PbTiO3 content increases the refractive indices of PIMNT single crystals increase, while the optical band gap decreases.

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