Abstract
A ceramic 2-µm laser beam visualizer based on Ho3+-doped β-BaZrF6 is proposed. The ceramic has been prepared by crystallizing 60ZrF4–35BaF2–5BiF3 glass doped with 3 wt % HoF3. Exciting the Ho3+5I7 level by a Tm:LiYF4 (Tm:YLF) laser at λ = 1910 nm, we observed a strong red luminescence, due to the 5F5 → 5I8 transition, and a weaker, green luminescence, corresponding to the (5F4, 5S2) → 5I8 transition. The threshold power density of the Tm:YLF laser at which a red spot was observed on a ceramic sample was 1.1 W/cm2.
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