EPR data confirm the presence of Fe impurities in single-crystal laser hosts of YAlO3. Optical absorption in Fe:YAlO3 was measured to distinguish contributions of Fe3+ and Fe2+ to passive loss in Nd:YAlO3. YAlO3 crystals grown or annealed in H2 contain both Fe2+ and OH− which increase the absorption loss at 1.06 μm and cause fluorescence quenching.
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Belt et al. (1974) studied this question.
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