YAlO3 crystals have been prepared with small percentages of different rare earths substituted for yttrium. The absorption and luminescence spectra of the samples activated with Dy, Ho, Er, Tm, and Yb have been measured at 77 K. An analysis of these spectra gave the positions of many of the crystalline Stark levels. Stimulated emission has been observed from Ho3+, Er3+, and Tm3+ ions in crystals of YAlO3.
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Antonov et al. (1973) studied this question.
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