25 research outputs found
Optical Telecommunications-Band Clock based on Neutral Titanium Atoms
We propose an optical clock based on narrow, spin-forbidden M1 and E2
transitions in laser-cooled neutral titanium. These transitions exhibit much
smaller black body radiation shifts than those in alkaline earth atoms, small
quadratic Zeeman shifts, and have wavelengths in the S, C, and L-bands of
fiber-optic telecommunication standards, allowing for integration with robust
laser technology. We calculate lifetimes; transition matrix elements; dynamic
scalar, vector, and tensor polarizabilities; and black body radiation shifts of
the clock transitions using a high-precision relativistic hybrid method that
combines a configuration interaction and coupled cluster approaches. We also
calculate the line strengths and branching ratios of the transitions used for
laser cooling. To identify magic trapping wavelengths, we have completed the
largest-to-date direct dynamical polarizability calculations. Finally, we
identify new challenges that arise in precision measurements due to magnetic
dipole-dipole interactions and describe an approach to overcome them. Direct
access to a telecommunications-band atomic frequency standard will aid the
deployment of optical clock networks and clock comparisons over long distances.Comment: 5 pages, 2 figures main text; 8 pages, 3 figures supplementary tex
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Optical telecommunications-band clock based on neutral titanium atoms
We propose an optical clock based on ultranarrow transitions in neutral titanium, which exhibit small blackbody radiation and quadratic Zeeman shifts and have wavelengths in the S-, C-, and L-telecommunications fiber bands, allowing for integration with robust laser technology. We calculate relevant properties using a high-precision relativistic hybrid method that combines configuration interaction and coupled-cluster approaches. To identify magic wavelengths, we have completed the largest-to-date direct dynamical polarizability calculations. Finally, we identify challenges that arise from magnetic dipole-dipole interactions and describe an approach to overcome them. A telecommunications-band atomic frequency standard will aid the deployment of optical clock networks and clock comparisons over long distances