Pulse-periodic Y3Al5O12:Er3+ laser with high activator concentration

The development of a pulsed Y₃Al₅O₁₂:Er³⁺ laser (⁴I_11/2–⁴I_13/2 transition, λ = 2.94 μ) with activator concentrations of 30 wt.% (T = 300 °K) is reported. A pulse repetition frequency of f = 20 Hz was obtained under free-oscillation and Q-switched conditions. Stimulated emission due to this transition at T = 300 °K was obtained over the whole concentration series of the Y₃Al₅O₁₂–Er₃Al₅O₁₂ system with Er³⁺ concentrations of between 10 and 100 wt.%.