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.
Lithium niobate doped with iron is an attractive material for use in holographic memory systems due to the combination of its photorefractive properties and relative ease of growth.
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