Harald Schnatz

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—Two 171 Yb + single-ion optical frequency standards operating at 688 THz (436 nm) are compared in order to investigate systematic frequency shifts in the subhertz range. In the absence of externally applied perturbations, a mean relative frequency difference of 3.8 · 10 −16 is observed. Using a femtosecond frequency comb generator based on an Er 3+-doped(More)
—We stabilize a microwave oscillator at 9.6 GHz to an optical clock laser at 344 THz by using a fiber-based femto-second laser frequency comb as a transfer oscillator. With a second frequency comb, we independently measure the instability of the microwave source with respect to another optical clock laser frequency at 456 THz. The total fractional frequency(More)
— We report on the setup and characterization of a 698 nm master-slave diode laser system to probe the S 1 0 – 3 P 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 [1] using a(More)
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