Abstract
High quality thulium doped Lu1.6Sc0.4O3 mixed sesquioxide laser ceramics were fabricated using a solid-state reactive sintering method. Optical and spectroscopic properties of the ceramics were studied. A high transmittance almost identical to the theoretical value of the ceramics was reached at the lasing wavelength. A large Stark splitting of 920 cm−1 for the ground states 3H6 and 472 cm−1 for the first excited states 3F4 of Tm3+ were observed, resulting in a long wavelength emission band around 2.09 μm with low reabsorption losses at this wavelength. CW laser operation at 2.09 μm pumped by a 796 nm laser diode was achieved with an output power of 11 W and an optical-to-optical conversion efficiency of 28.9%, both of which are the highest values reported so far for lasing around 2.1 μm in Tm3+ doped mixed sesquioxide ceramics.
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