LAUSR

Abstract Fluoro-sulfo-phosphate poly-anionic glasses KPO3–AlF3–K2SO4 (KPFS) and Nd3+-doped samples (Nd–KPFS) were prepared by conventional melt-quenching method and their physical properties were comprehensively analyzed. Their actual glass compositions were carefully checked by different methods. These glasses exhibit typically low linear refractive index nd (~ 1.482) and nonlinear refractive index n2 (~ 0.86 × 10−13 esu), high Abbe's number (~ 72.0) and moderate elasticity modulus E⁎ (~ 50.2 GPa). The spectroscopic properties of Nd–KPFS specimens are further evaluated by the Judd-Ofelt theory, and the results suggest that the stimulated radiative parameters can be enhanced by tuning sulfate contents. Besides, Nd–KPFS glasses present relatively long lifetime τexp (~ 428 μs) and large figure of merit FOM (~ 9.29 × 10−24 cm2 s). All of the results imply that such fluoro-sulfo-phosphate glass would be a promising candidate for solid-state laser.