YAlO3:Er laser crystals with medium dopant concentration can emit on different transitions of the 4I11/2→4I13/2 manifolds within a laser pulse. In a 20-at. % doped a rod the three most prominent laser lines oscillate at wavelengths of λ1=2.73 μm, λ2=2.79 μm, and λ3=2.92 μm. The temporal sequence of λ1, λ2, and λ3 within a train of relaxation oscillations has been measured and is analyzed on the basis of inversion, linewidth of transitions, and ion-ion interaction in the 4I13/2 state.
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Stalder et al. (1987) studied this question.
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