Yb,Na:CaSrF2 - A promising laser crystal medium in UV - VIS - Near-IR domain

The crystal CaF
₂
and its isotypes SrF
₂
and BaF
₂
doped with lanthanide elements, they are investigated for nonlinear optical applications and generation of ultrashort laser pulses. The Yb-doped crystal fluoride matrixes are could be also attractive for ICT, medical interventions, laser materials treatment, etc. The broad near-IR (NIR) luminescence in Yb
³⁺
state (the second telecommunication window) and also their yellow-green and near-UV luminescence of Yb
²⁺
are observed at low temperatures, although for the Yb,Na:CaSrF
₂
it is clearly observable at normal conditions. The Stokes fluorescence bands between 300 - 400 nm for the Yb,Na:CaSrF
₂
crystal medium induced from non-parametric processes in UV are narrow, clearly distinguishable and could be applied for novel lasers in UV - VIS range.