Enhanced Multiphoton Absorption Induced Luminescence in Transparent Sm³⁺-doped Ba₂TiSi₂O₈ Glass-ceramics

Abstract

Fresnoite, Ba2TiSi2O8, is a ferroelectric crystal with a very large second-order optical nonlinearity. X-ray diffraction analysis and Raman spectra indicate that Ba2TiSi2O8 crystals are precipitated in the glass-ceramics after heat treatment at 750 °C for 2 h. Near-infrared to visible upconversion luminescence is observed in Sm3+-doped glass and glass-ceramic samples under infrared femtosecond laser irradiation, and the Sm3+-doped glass-ceramic shows strongly enhanced mutiphoton absorption induced luminescence and improved saturate threshold compared with the as-prepared glass. The mechanisms of the observed phenomena are discussed.