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Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)

A transportable optical lattice clock using 171Yb

Gregor Mura, Tobias Franzen, C. Abou-Jaoudeh, Axel Görlitz, Heiko Luckmann, Ingo Ernsting, Alexander Yu. Nevsky, Stephan Schiller

Published Jul 1, 2013• 7 citations
Publisher

Abstract

We present first results on the spectroscopy of the1S0→3P0transition at 578nm in a transportable171Yb optical lattice clock. With the Yb atoms confined in a one-dimensional optical lattice, we have observed linewidths below 200 Hz, limited by saturation broadening. Currently the system is being upgraded towards full clock operation and use of more compact and robust subsystems.

DOI
10.1109/eftf-ifc.2013.6702292

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European Frequency and Time Forum•Mar 27, 2006•0 citations
We present first results on the spectroscopy of the1S0→3P0transition at 578nm in a transportable171Yb optical lattice clock. With the Yb atoms confined in a one-dimensional optical lattice, we have observed linewidths below 200 Hz, limited by saturation broadening. Currently the system is being upgraded towards full clock operation and use of more compact and robust subsystems.
An ultra-narrow spectroscopy of clock transition with high signal-to-noise ratio is crucial for a high-performance atomic optical clock. We present a detailed study about how to obtain a Hertz-level clock transition spectrum of 171 Yb atoms. About 4 × 10 4 atoms are loaded into a one-dimensional optical lattice with a magic wavelength of 759 nm, and a long lifetime of 3 s is realized with the lattice power of 1 W. Through normalized shelving detection and spin polarization, 171 Yb clock spectroscopy with a Fourier-limited linewidth of 5.9 Hz is obtained. Our work represents a key step toward an ytterbium optical clock with high frequency stability.
We report spectroscopy of the 1S 0 - 3P 0 clock transition in neutral 174Yb atoms confined to a one-dimensional optical lattice at the ac Stark shift-canceling wavelength of 759.35 nm. Spectroscopic linewidths as narrow as 4 Hz, full width at half-maximum, are shown with good contrast and signal-to-noise ratios. An upper limit on frequency instability is demonstrated to be 3 × 10−15 at one second by measuring with respect to another stable laser through a Ti:sapphire femtosecond laser frequency comb.