4 research outputs found
Collisional losses, decoherence, and frequency shifts in optical lattice clocks with bosons
We have quantified collisional losses, decoherence and the collision shift in
a one-dimensional optical lattice clock with bosonic 88Sr. The lattice clock is
referenced to the highly forbidden transition 1S0 - 3P0 at 698 nm, which
becomes weakly allowed due to state mixing in a homogeneous magnetic field. We
were able to quantify three decoherence coefficients, which are due to
dephasing collisions, inelastic collisions between atoms in the upper and lower
clock state, and atoms in the upper clock state only. Based on the measured
coefficients, we determine the operation parameters at which a 1D-lattice clock
with 88Sr shows no degradation due to collisions on the relative accuracy level
of 10-16.Comment: 4 pages, 3 figure
Interrogation laser for a strontium lattice clock
We report on the setup and characterization of a 698 nm master-slave diode
laser system to probe the 1S0-3P0 clock transition of strontium atoms confined
in a one-dimensional optical lattice. A linewidth in the order of around 100 Hz
of the laser system has been measured with respect to an ultrastable 657 nm
diode laser with 1 Hz linewidth using a femtosecond fiber comb as transfer
oscillator. The laser has been used to measure the magnetically induced 1S0-3P0
clock transition in 88Sr where a linewidth of 165 Hz has been observed. The
transfer oscillator method provides a virtual beat signal between the two diode
lasers that has been used to phase lock the 698 nm laser to the 1 Hz linewidth
laser at 657 nm, transferring its stability to the 698 nm laser system.Comment: 5 pages, 7 figures, to be published in "IEEE Transactions on
Instrumentation and Measurement, Special Issue CPEM 2008