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Rare-earth doped transparent ceramics for spectral filtering and quantum information processing
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Homogeneous linewidths below 10 kHz are reported for the first time in high-quality Eu3+
doped Y 2O3 transparent ceramics. This result is obtained on the 7F0→5D0 transition in Eu3+
doped Y 2O3
ceramics and corresponds to an improvement of nearly one order of magnitude compared to previously reported values in transparent ceramics. Furthermore, we observed spectral hole lifetimes of ∼15 min that are long enough to enable efficient optical pumping of the nuclear hyperfine levels. Additionally, different Eu3+ concentrations (up to 1.0%) were studied, resulting in an increase of up to a factor of three in the peak absorption coefficient. These results suggest that transparent ceramics can be useful in applications where narrow and deep spectral holes can be burned into highly absorbing lines, such as quantum information processing and spectral filtering.
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