Single crystals of Er3+:CdF2 with good optical quality were grown by a Bridgman technique after purification of the starting materials. Absorption and emission spectra are recorded at room temperature. The Judd–Ofelt (JO) analysis was applied to obtain the three phenomenological intensity parameters and the transition strengths. These JO parameters are used to calculate the radiative transition probabilities, the radiation lifetimes and the branching ratios. The results obtained are in good agreement with those of other fluoride laser materials. We also carried out luminescence measurements for red and green emission. The studied host may offer infrared and visible laser emissions.
The Tm3+:5NaF-9YF3 single crystals were grown by Czochralski pulling technique after purification of the starting materials. The obtained crystals are of good optical quality. Optical absorption of this material is investigated. The Judd–Ofelt (JO) analysis was applied to the room temperature absorption intensities of Tm3+ ions to determine the so-called JO intensity parameters and the transition strengths. These JO parameters are used to calculate the radiative transition probabilities, the radiation lifetimes and the branching ratios. The results obtained indicate that Tm3+:5NaF-9YF3 may be considered as a laser active material.
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