Spectral analyses of Dy/Sr: LaF and Dy/Ca: LaF mixed crystals for laser applications.

Mixed crystals of Dy/Sr: LaF and Dy/Ca: LaF were grown by Bridgman technique and their spectral properties were investigated. Spectra broadening and peak shifts were observed, indicating the co-doping of Sr/Ca brings about a more disordered local symmetry of Dy, which makes both crystals favorable for tunable lasing action. Low-temperature high resolution excitation and emission spectra were carried out for exploring the types of luminescent center of Dy in crystals.