Abstract

Room-temperature 1.532-μm pumped 1.645-μm laser action in the Er³⁺:Y₃Al₅O₁₂(Er:YAG) ⁴I_13/2y3 (6602-cm⁻¹) ⇒ ⁴I_15/2z7 (523-cm⁻¹) transition was demonstrated and was analyzed. Laser action at 1.645 μm was achieved in Er:YAG crystals with Er concentrations ranging from 0.5% to 4%. Slope efficiencies as high as 40% were obtained with 0.5% Er:YAG. For concentrations up to 4%, measurements of laser thresholds indicate that upconversion losses were small.

© 1994 Optical Society of America

Effects of energy transfer among Er³⁺ ions on the fluorescence decay and lasing properties of heavily doped Er:Y₃Al₅O₁₂

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