Abstract
By exciting at 940nm, we have characterized the 1.84μm near infrared emission of trivalent thulium ions in Yb3+, Tm3+:KGd(WO4)2 single crystals as a function of the dopant concentration and temperature, from 10K to room temperature. An overall H63 Stark splitting of ∼470cm−1 for the Tm3+ ions in the Yb3+, Tm3+:KGd(WO4)2 was obtained. We also studied the blue emission at 476nm (Tm3+) and the near infrared emissions at 1.48μm (Tm3+) and 1μm (Yb3+) as a function of the dopant concentration. Experimental decay times of the G41, H43, and F43 (Tm3+) and F5∕22 (Yb3+) excited states have been measured as a function of Yb3+ and Tm3+ ion concentrations. For the F43→H63 transition of Tm3+ ions, we used the reciprocity method to calculate the maximum emission cross section of 3.07×10−20cm2 at 1.84μm for the polarization parallel to the Nm principal optical direction.
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