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APS

Absolute Frequency Measurement of ^1S 0 - ^3P 1 Clock Transition in Ultra-Cold Strontium

Martin M. Boyd, Thomas H. Loftus, T. Ido, Andrew D. Ludlow, Robin J. Jones, Jun Ye

Published May 1, 2004• 0 citations
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We report on our progress toward the realization of an optical frequency standard referenced to strontium intercombination lines. While first frequency measurement of the weakly allowed 1S 0- 3P 1 transition was done with saturation spectroscopy on a thermal beam, we are preparing the experimental setup for high resolution spectroscopy on ultracold atoms of the doubly forbidden 1S 0- 3P 0 line. Our current setup allows the capture more than 10 7 atoms at 1 μK in 500 ms in two stages of magneto-optical trapping. We also demonstrated the dipole trapping of ultracold strontium isotopes for accurate spectroscopy and collisional measurements. A semiconductor laser source at 698 nm has already been locked to a pre-stabilization cavity obtaining a fast linewidth of less than 1 kHz. Second stage stabilization of the clock laser to ultra-high finesse cavity is in development. Recent measurement of elastic and inelastic cross-sections of the two most abundant 88Sr and 86Sr isotopes are also presented.

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European Quantum Electronics Conference (EQEC)•Jan 1, 2003•0 citations
Absolute frequency measurement of the 1^{1}1S0_{0}0​↔\leftrightarrow↔3^{3}3P0_{0}0​ clock transition at 578.4 nm in ytterbium
We report on our progress toward the realization of an optical frequency standard referenced to strontium intercombination lines. While first frequency measurement of the weakly allowed 1S 0- 3P 1 transition was done with saturation spectroscopy on a thermal beam, we are preparing the experimental setup for high resolution spectroscopy on ultracold atoms of the doubly forbidden 1S 0- 3P 0 line. Our current setup allows the capture more than 10 7 atoms at 1 μK in 500 ms in two stages of magneto-optical trapping. We also demonstrated the dipole trapping of ultracold strontium isotopes for accurate spectroscopy and collisional measurements. A semiconductor laser source at 698 nm has already been locked to a pre-stabilization cavity obtaining a fast linewidth of less than 1 kHz. Second stage stabilization of the clock laser to ultra-high finesse cavity is in development. Recent measurement of elastic and inelastic cross-sections of the two most abundant 88Sr and 86Sr isotopes are also presented.
Photoassociation spectroscopy is used to probe the ro-vibrational spectrum of the strontium dimer at the at the /sup 1/S/sub 0/ + /sup 3/P/sub 1/ - asymptote by measuring the trap loss depending on the frequency of a photoassociation laser red-detuned to the 1S/sub 0/-3P/sub 1/ transition. This study can be complemented by the measurement of the density dependent shift of the frequency of this narrow intercombination transition. The possibilities to realise a frequency standard on these transitions are discussed.