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Stefan Alaric Schäffer
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Atomic clock performance beyond the geodetic limit
WF McGrew, X Zhang, RJ Fasano, SA Schäffer, K Beloy, D Nicolodi, ...
Nature 564, 87-90, 2018
679*2018
AEDGE: atomic experiment for dark matter and gravity exploration in space
YA El-Neaj, C Alpigiani, S Amairi-Pyka, H Araújo, A Balaž, A Bassi, ...
EPJ Quantum Technology 7 (1), 1-27, 2020
299*2020
Frequency ratio measurements with 18-digit accuracy using a network of optical clocks
K Beloy, MI Bodine, T Bothwell, SM Brewer, SL Bromley, JS Chen, ...
Nature 591, 564–569, 2021
271*2021
Towards the optical second: verifying optical clocks at the SI limit
WF McGrew, X Zhang, H Leopardi, RJ Fasano, D Nicolodi, K Beloy, J Yao, ...
Optica 6 (4), 448-454, 2019
1272019
Lasing on a narrow transition in a cold thermal strontium ensemble
SA Schäffer, M Tang, MR Henriksen, AA Jørgensen, BTR Christensen, ...
Physical Review A 101 (1), 013819, 2020
592020
Cold atoms in space: community workshop summary and proposed road-map
I Alonso, C Alpigiani, B Altschul, H Araújo, G Arduini, J Arlt, L Badurina, ...
EPJ Quantum Technology 9 (1), 1-55, 2022
492022
Optical-Clock-Based Time Scale
J Yao, JA Sherman, T Fortier, H Leopardi, T Parker, W McGrew, X Zhang, ...
Physical Review Applied 12 (4), 044069, 2019
412019
Nonlinear spectroscopy of Sr atoms in an optical cavity for laser stabilization
BTR Christensen, MR Henriksen, SA Schäffer, PG Westergaard, D Tieri, ...
Physical Review A 92 (5), 053820, 2015
392015
Optical atomic clock comparison through turbulent air
MI Bodine, JD Deschênes, IH Khader, WC Swann, H Leopardi, K Beloy, ...
Physical Review Research 2 (3), 033395, 2020
292020
Faraday-shielded dc Stark-shift-free optical lattice clock
K Beloy, X Zhang, WF McGrew, N Hinkley, TH Yoon, D Nicolodi, ...
Physical review letters 120 (18), 183201, 2018
242018
Dynamics of bad-cavity enhanced interaction with cold Sr atoms for laser stabilization
SA Schäffer, BTR Christensen, MR Henriksen, JW Thomsen
Physical Review A 96, 013847, 2017
232017
Cavity-immune spectral features in the pulsed superradiant crossover regime
M Tang, SA Schäffer, AA Jørgensen, MR Henriksen, BTR Christensen, ...
Physical Review Research 3 (3), 033258, 2021
13*2021
Progress on optical‐clock‐based time scale at NIST: Simulations and preliminary real‐data analysis
J Yao, J Sherman, T Fortier, H Leopardi, T Parker, J Levine, J Savory, ...
Navigation: Journal of The Institute of Navigation 65 (4), 601-608, 2018
11*2018
Optical frequency measurements at 1× 10− 18 uncertainty with ytterbium optical lattice clocks
AD Ludlow, WF McGrew, X Zhang, D Nicolodi, RJ Fasano, SA Schaffer, ...
2018 Conference on Precision Electromagnetic Measurements (CPEM 2018), 1-2, 2018
72018
Towards passive and active laser stabilization using cavity-enhanced atomic interaction
SA Schäffer, BTR Christensen, SM Rathmann, MH Appel, MR Henriksen, ...
Journal of Physics: Conference Series 810 (1), 012002, 2017
72017
Collectively enhanced Ramsey readout by cavity sub-to superradiant transition
EA Bohr, SL Kristensen, C Hotter, SA Schäffer, J Robinson-Tait, ...
Nature Communications 15 (1), 1084, 2024
42024
Prospects of a superradiant laser based on a thermal or guided beam of
M Tang, SA Schäffer, JH Müller
Physical Review A 106 (6), 063704, 2022
42022
Large waist cavity for ultra-narrow transition spectroscopy
SA Schäffer, SS Adsersen, BTR Christensen, JW Thomsen
Frequency Control Symposium & the European Frequency and Time Forum (FCS …, 2015
32015
Towards an active optical clock using an optical conveyor within a ring cavity
G Kazakov, S Dubey, F Famà, S Zhou, SA Schäffer, S Bennetts, F Schreck
2021 Joint Conference of the European Frequency and Time Forum and IEEE …, 2021
22021
Laser stabilization on velocity dependent nonlinear dispersion of Sr atoms in an optical cavity
BTR Christensen, SA Schäffer, MR Henriksen, PG Westergaard, J Ye, ...
2015 Joint Conference of the IEEE International Frequency Control Symposium …, 2015
22015
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Articles 1–20