We report the optical study of europium nitrate hexahydrate crystals Eu(NO3)⋅3 6H2O and their deuterated version Eu(NO3)⋅3 6D2O conducted at 50 mK. The crystals show sub-GHz inhomogeneous linewidths for the F07↔5D0 transition and optical coherence times up to 136 μs for the non-deuterated crystal and 750 μs for the deuterated one. In addition, using the spectral hole burning technique, the hyperfine splittings in the absence of an external field have been estimated for the ground and optical levels. These results suggest that rare-earth nitrate crystals could represent a promising class of materials for quantum information applications as well as for fundamental physics experiments requiring narrow optical transitions and good coherence properties.
High-resolution optical spectroscopy of europium nitrate hexahydrate crystals
Chiossi F.
;
2025
Abstract
We report the optical study of europium nitrate hexahydrate crystals Eu(NO3)⋅3 6H2O and their deuterated version Eu(NO3)⋅3 6D2O conducted at 50 mK. The crystals show sub-GHz inhomogeneous linewidths for the F07↔5D0 transition and optical coherence times up to 136 μs for the non-deuterated crystal and 750 μs for the deuterated one. In addition, using the spectral hole burning technique, the hyperfine splittings in the absence of an external field have been estimated for the ground and optical levels. These results suggest that rare-earth nitrate crystals could represent a promising class of materials for quantum information applications as well as for fundamental physics experiments requiring narrow optical transitions and good coherence properties.
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