Abstract
A LiNbO3(:Fe) or LiTaO3 film is sandwiched between a (012)-oriented α-sapphire wafer and an amorphous Al2O3 or SiO2 film using pulsed laser deposition. After annealing at 1000 °C in O2, the film becomes a c-oriented single-domain ferroelectric. This sandwich structure shows an enhanced photoluminescence from trace amounts of Cr3+ centers in the host α-sapphire (R-line emission at 691 nm). Spectral analyses suggest that both strong space-charge and photorefractive effects of the LiNbO3(:Fe) or LiTaO3 film cause a change in the crystal field of the host α-sapphire, which increases the transition probability of Cr3+ and thus leads to an enhancement of the R-line intensity. The result has prospective applications in laser and optical integrated devices.
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77.55.+f; 78.20.-e; 78.55.-m
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Yang, X., Wu, X., Siu, G. et al. Enhanced photoluminescence from Cr3+ centers in α-sapphire coated with LiNbO3(:Fe) and LiTaO3 films. Appl. Phys. A 79, 2085–2087 (2004). https://doi.org/10.1007/s00339-004-2879-4
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DOI: https://doi.org/10.1007/s00339-004-2879-4