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Spectrally resolved optical frequency comb from a self-referenced 5 GHz femtosecond laser
Albrecht Bartels, Raphael Gebs, Matt Kirchner +1
We report a mode-locked Ti:sapphire femtosecond laser with 5GHz repetition rate. Spectral broadening of the 24 fs pulses in a microstructured fiber yields an octave-spanning spectr…
Coherent optical phase transfer over a 32-km fiber with 1-s instability at
Seth M. Foreman, Andrew D. Ludlow, Marcio H. G. de Miranda +3
The phase coherence of an ultrastable optical frequency reference is fully maintained over actively stabilized fiber networks of lengths exceeding 30 km. For a 7-km link installed…
Observation of the 1S0 - 3P0 clock transition in 27Al+
T. Rosenband, P. O. Schmidt, D. B. Hume +8
We report for the first time, laser spectroscopy of the 1S0 - 3P0 clock transition in 27Al+. A single aluminum ion and a single beryllium ion are simultaneously confined in a linea…
Measurement of excited-state transitions in cold calcium atoms by direct femtosecond frequency-comb spectroscopy
J. E. Stalnaker, Y. Le Coq, T. M. Fortier +3
We apply direct frequency-comb spectroscopy, in combination with precision cw spectroscopy, to measure the transition frequency in cold calc…