Abstract

Fluoride crystals are the most common host materials for visible lasers due to large energy band gap and low phonon energy. Among the rare-earth ions, the Pr³⁺ is very attractive ion for visible solid-state lasers. Efficient laser operation in Pr-doped crystals was obtained around 480 nm, 523 nm, 607 nm, 640 nm, 698 nm and 720 nm [1]. Mixed fluorides LiY_xLu_x-1F₄ crystals posses higher optical quality and require less expensive lutetium fluoride during growth in contrast to LiYF₄ and LiLuF₄, respectively. Moreover, in the case of Сe³⁺ and Nd³⁺ ions, the mixed fluorides have higher segregation coefficient comparing to both LiYF₄ and LiLuF₄ crystals [2, 3]. The optimal cationic composition is x = 0.6–0.7.

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