Thermal and spectroscopic properties of Tm3Â + doped TZPPN transparent glass laser material

► The prepared glass has high thermal stabilities (∆T = 164 °C). ► This material possesses long radiative lifetime (1.94 ms). ► It has large gain coefficient (3.36 cm− 1). ► Tm3 + doped TZPPN glass is a potential laser material for 1.85 μm.