Hamburg 2009 – scientific programme
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A: Fachverband Atomphysik
A 35: Precision Spectroscopy of Atoms and Ions VI
A 35.3: Talk
Friday, March 6, 2009, 11:30–11:45, VMP 6 HS-B
Decoherence and losses by collisions in 88Sr lattice clocks — •Joseph Sundar Raaj Vellore Winfred, Christian Lisdat, Thomas Middelmann, Fritz Riehle, and Uwe Sterr — Physikalisch-Technische Bundesanstalt and Centre for Quantum Engineering and Space-Time Research QUEST,Bundesallee 100, 38116 Braunschweig,Germany.
Recent advancement in optical frequency metrology has enabled optical lattice clocks with neutral atoms to surpass Cesium fountain clock’s stability and accuracy. Such precise measurement of time is very important in technological and scientific endeavors. High atom number induces collisional effects in neutral atom clocks. In case of the 87Sr fermionic isotope, collision induced frequency shift is suppressed while in 88Sr bosonic isotope the shift is present due to s-wave collisions. Due to its higher natural abundance, a 88Sr optical clock can offer better signal-to-noise ratio and therefore higher stability. We report our study of collision induced losses in a 88Sr optical lattice clock. Around 1×106 88Sr atoms are loaded into a 1-D optical lattice operated at the magic wavelength. The atoms are interrogated on the doubly forbidden 1S0-3P0 transition which is made possible by applying static magnetic field that mixes the 3P1 state to 3P0 state. The investigations of density dependent losses and of line broadening give estimates for the loss coefficients which would determine the operational parameters of an 88Sr optical lattice clock.