163 citations · 543 across the 6 of their papers we have counts for
6 papers
Thermal expansion coefficient of single crystal silicon from 7 K to 293 K
Thomas Middelmann, Alexander Walkov, Guido Bartl +1
We measured the absolute lengths of three single crystal silicon samples by means of an imaging Twyman-Green interferometer in the temperature range from 7 K to 293 K with uncertai…
High accuracy correction of blackbody radiation shift in an optical lattice clock
Thomas Middelmann, Stephan Falke, Christian Lisdat +1
We have determined the frequency shift that blackbody radiation is inducing on the S -- P clock transition in strontium. Previously its uncertainty li…
Long range transport of ultra cold atoms in a far-detuned 1D optical lattice
Thomas Middelmann, Stephan Falke, Christian Lisdat +1
We present a novel method to transport ultra cold atoms in a focused optical lattice over macroscopic distances of many Rayleigh ranges. With this method ultra cold atoms were tran…
The 87-Sr optical frequency standard at PTB
St. Falke, H. Schnatz, J. S. R. Vellore Winfred +8
With 87-Sr atoms confined in a one dimensional optical lattice, the frequency of the optical clock transition 5s^2 ^1S_0 - 5s5p ^3P_0 has been determined to be 429 228 004 229 872.…
Tackling the blackbody shift in a strontium optical lattice clock
Thomas Middelmann, Christian Lisdat, Stephan Falke +3
A major obstacle for optical clocks is the frequency shift due to black body radiation. We discuss how one can tackle this problem in an optical lattice clock; in our case 87-Sr: f…
Collisional losses, decoherence, and frequency shifts in optical lattice clocks with bosons
Ch. Lisdat, J. S. R. Vellore Winfred, T. Middelmann +2
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 high…