Spectral properties and anti-Stokes luminescence of TeO2-BaF2:Ho3+, Ho3+/Yb3+ ceramics and glass excited by 1.9-mu m radiation of a Tm:LiYF4 laser

摘要

We demonstrate the up-conversion of Tm:LiYF4 infrared (IR) laser radiation with 1908-nm wavelength into visible light with a spectral maximum at 650 nm by ceramics with a composition of (100 - x)TeO2-xBaF(2) - 1 wt % HoF3-yYbF(3), where x = 20, 30, or 40 mol % and y = 0 or 0.5 wt %. The samples of 60TeO(2)-40BaF(2) - 1 wt % HoF3 - 0.5 wt % YbF3 exhibited anti-Stokes luminescence at a threshold radiation power density of 1.0-1.5 W cm(-2).