Spectroscopic characteristics of 1.54 μm emission in Er/Yb:LiNbO3 crystals tridoped with In3+ ions

► Zr/Er/Yb:LiNbO3 crystals were grown by Czochralski technique. ► The strongest 1.54 μm emission is observed for In (2 mol%)-doped Er/Yb:LiNbO3. ► Judd-Ofelt parameters based on UV-vis-infrared absorption spectra are discussed. ► Absorption/emission cross-section and fluorescence lifetimes are reported. ► Gain cross-section spectra in the eye-safe regime of 1450-1650 nm are studied.