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High optical quality Lu2SiO5 (LSO) and (Lu0.5Gd0.5)2SiO5 (LGSO) laser crystals codoped with Er3+ and Yb3+ have been fabricated by the Czochralski method. Intense upconversion (UC) and infrared emission (1543nm) are observed under excitation of 975nm. The luminescence processes are explained and the emission efficiencies are quantitatively obtained by measuring the UC efficiency and calculating the emission cross section. The temperature-dependent optical properties of the crystals are also investigated. Our study indicates that Er3+–Yb3+:LSO and Er3+–Yb3+:LGSO crystals are promising gain media for developing the solid-state 1.5μm optical amplifiers and tunable UC lasers.
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Han et al. (2008) studied this question.
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