Abstract
High optical quality Nd,Y-codoped CaF2 crystals with diameter 3-inch were obtained by TGT method. Absorption and emission spectra were recorded at 5 K, 12 K, and 300 K respectively. Judd–Ofelt theory was applied to obtain standard parameter Ωt (t = 2, 4, 6) and the fitting result of experimental lifetime of Nd3+ 4F3/2 → 4I11/2 transition. Broad and flat 1.06 μm emission spectra of Nd3+ ions were obtained with Y3+-codoping. The largest emission bandwidth of Nd3+ 4F3/2 → 4I11/2 transition is up to 28 nm. The results revealed that codoping Y3+ ions in Nd:CaF2 crystal can effectively modulate the spectra properties of Nd3+ ions, in addition to the reduction of fluorescence concentration-quenching.
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