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Frontiers in Optics

High resolution spectroscopy of optical lattice-confined 174Yb

Chad Hoyt, Zeb W. Barber, Chris W. Oates, Leo W. Hollberg

Published Jan 1, 2006• 0 citations
Publisher

Abstract

We report high resolution spectroscopy of optical lattice-confined 174Yb atoms. We demonstrate spectroscopic linewidths as narrow as 4 Hz (full-width at half-maximum) using the highly forbidden clock transition (1S0-3P0) in a one-dimensional optical lattice.
DOI
10.1364/ls.2006.lthb3

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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.
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.
With ultracold 87Srconfined in a magic wavelength optical lattice, we present the most precise study (2.8 Hz statistical uncertainty) to date of the 1S0-3P0 optical clock transition with a detailed analysis of systematic shifts (19 Hz uncertainty) in the absolute frequency measurement of 429 228 004 229 869 Hz. The high resolution permits an investigation of the optical lattice motional sideband structure. The local oscillator for this optical atomic clock is a stable diode laser with its hertz-level linewidth characterized by an octave-spanning femtosecond frequency comb.