The growth, spectroscopic properties, laser parameters, and laser performance of a Nd3+/Mg2+ co-doped congruent LiTaO3 crystal were investigated. Continuous-wave (cw) laser operation at a wavelength of about 1083 nm with a slope efficiency of nearly 12% was achieved. The maximum cw output power obtained was 615 mW, which, to the best of our knowledge, is the highest output power obtained for this crystal thus far. We propose that Nd:MgO:LiTaO3 lasers could be an excellent source for the optical pumping of helium, and may achieve second harmonic generation and optical parametric oscillation in the same crystal.
High-quality Dy:PbF2 crystal is grown by the Bridgman method in a nonvacuum atmosphere. By measuring the area under absorption bands, the experimental oscillator strengths are determined. The Judd–Ofelt (JO) intensity parameters Ωλ (λ = 2, 4, 6) are evaluated by the least-squares fit method. These phenomenological parameters are used to predict radiative transition probabilities, radiative lifetime and branching ratios for various excited levels of the Dy3+:PbF2 crystal. Photoluminescence spectra and lifetime of 6H13/2 levels of the Dy3+ ions have been measured. The laser transitions with most potential are identified and the utility of the PbF2 crystal as laser active material is discussed.
A Tm, Mg co-doped LiNbO 3 crystal was grown by the traditional Czochralski method. The room-temperature absorption, photo-luminescence spectra and fluorescence lifetime of Tm 3+ ions in the crystal have been investigated. The experimental results show that the co-doped of MgO can lead to the lengthening of the measured fluorescence lifetime of the upper Tm 3+ : 3 F 4 level. Based on the Judd-Ofelt approach, the intensity parameters 2,4,6 of Tm 3+ were calculated to be 2 (6.29 × 10 −20 cm 2 ), 4 (0.54 × 10 −20 cm 2 ) and 6 (0.79 × 10 −20 cm 2 ). Other spectroscopic parameters that relate to laser performance were also obtained. Non-photorefractive continuous wave laser operation with a Tm, Mg:LiNbO 3 single crystal is demonstrated at room temperature for the first time. We obtained 1.026 W output power at 1.885 µm with a slope efficiency of near 14%, which, to the best of our knowledge, is the largest output power and the highest slope efficiency obtained for this crystal thus far. The output power was observed to be stable, and the crystal showed no sign of photorefractive damage.
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