Exploring Gravity with Optical Clocks



What is an optical clock?

Mission proposals


EU-FP7 project "SOC2"




General Publications

· Einstein Gravity Explorer Mission

· Satellite Optical Clocks: Fundamental Tests and Applications

· Optical Clocks in Space, Proc. III International Conference on Particle and Fundamental Physics in Space (SpacePart06), Beijing 19 - 21 April 2006, Nuclear Physics B (Proc. Suppl.) 166, 300–302 (2007), arXiv:gr-qc/0608081

· Precision Test Of General Relativity Of The Equivalence Principle Using Ultrastable Optial Clocks: A Mission Prospal

Publications of Project “Space Optical Clocks” (2007-11)
Funded by ESA, EU, German Space Agency DLR, and other national agencies

Westergaard et al.,
Lattice-Induced Frequency Shifts in Sr Optical Lattice Clocks at the 1E-17 Level (2011)
Phys. Rev. Lett. 106, 210801 (2011)

Falke et al.,
The 87Sr optical frequency standard at PTB (2011)
Metrologia 48, 399 (2011)

Schiller et al.,
The Space Optical Clocks Project - Status Report March 2011

Schiller et al.,
The Space Optical Clocks Project
Proc. Int. Conf. On Space Optics (2010)

Schioppo et al.,
“Development of a transportable laser cooled strontium source for future applications in space”,

Proc. EFTF(2010)

Lisdat et al.,
“Collisional Losses, Decoherence, and Frequency Shifts in Optical Lattice Clocks with Bosons”,

Phys. Rev. Lett. 103, 90801 (2009).

Lodewyck et al.,
“Non-destructive measurement of the transition probability in a Sr optical lattice clock”,

Phys. Rev. A 79, 061401 (2009).

A. Yu. Nevsky, U. Bressel, I. Ernsting, Ch. Eisele, M. Okhapkin, S. Schiller, A. Gubenko, D. Livshits, S. Mikhrin, I. Krestnikov, A. Kovsh,
“A narrow-linewidth external cavity quantum dot laser for high-resolution spectroscopy in the near-infrared and yellow spectral ranges”,
Appl. Phys. B 92, 501-507 (2008)

Westergaard et al,
“Optimization of the Dick effect in an optical lattice clock”,

Proc. EFTF - IFCS, p. 1187 (2009),

Poli et al,
“An optical lattice clock based on bosonic Sr”,

Proc. EFTF - IFCS, p. 347 (2009).

N. Poli, M. G. Tarallo, M. Schioppo, C. W. Oates, G. M. Tino
“A simplified optical lattice clock”,
Appl. Phys. B97, 27-33 (2009)

Legero, T., Lisdat, C., Winfred, J. S. R. V., Schnatz, H., Grosche, G., Riehle, F. & Sterr, U.,
“Interrogation laser for a strontium lattice clock”,

IEEE Trans. Instrum. Meas. 58, 1252-1257 (2009)

Vellore Winfred et al.,
“Determining the clock frequency shift due to collisions in a 1-D optical lattice clock with 88Sr”,

Proc. EFTF - IFCS, p. 146 (2009),

Abou-Jaoudeh et al.
“A Compact Source of Ultracold Ytterbium for an Optical Lattice Clock”,

Proc. EFTF - IFCS, p. 756 (2009)

Millo et al.
“Ultrastable lasers based on vibration insensitive cavities”

Phys. Rev. A, 79, 053829 (2009).

X. Baillard, M. Fouché, R. Le Targat, P.G. Westergaard, A. Lecallier, F. Chapelet, M. Abgrall, G.D. Rovera, P. Laurent, P. Rosenbusch, S. Bize, G. Santarelli, A. Clairon, P. Lemonde, G. Grosche, B. Lipphardt and H. Schnatz,
“An optical lattice clock with spin-polarized 87Sr atoms”,
Eur. Phys. J. D, 48, 11 (2008).

Xavier Baillard, Mathilde Fouché, Rodolphe Le Targat, Philip G. Westergaard, Arnaud Lecallier, Yann Le Coq, Giovanni D. Rovera, Sebastien Bize and Pierre Lemonde,
“Accuracy evaluation of an optical lattice clock with bosonic atoms”,
Opt. Lett. 32, 1812 (2007)

S. Blatt, A. D. Ludlow, G. K. Campbell, J.W. Thomsen, T. Zelevinsky, M. M. Boyd, and J. Ye, X. Baillard, M. Fouché, R. Le Targat, A. Brusch, and P. Lemonde, M. Takamoto, F.-L. Hong, and H. Katori, V.V. Flambaum,
“New Limits on Coupling of Fundamental Constants to Gravity Using 87Sr Optical Lattice Clocks”,
Phys. Rev. Lett. 100, 140801 (2008)

N. Nemitz, F. Baumer, F. Münchow, S. Tassy, A. Görlitz,
“Production of ultracold heteronuclear YbRb* molecules by photoassociation”,
arXiv:0807.0852, Proc. EFTF 2009

N. Poli, R. E. Drullinger, G. Ferrari, M. Prevedelli, F. Sorrentino, M. G. Tarallo, and G. M. Tino,
“Prospect for a compact strontium optical clock”,
Proc. of SPIE 6673, 66730F (2007)