Stefan Alaric Schäffer
Postdoc
Quantop
Blegdamsvej 17
2100 København Ø
10-18 optical atomic clock comparisons within the boulder atomic clock network
Nardelli, N. V., Beloy, K., Bodine, M. I., Bothwell, T., Brewer, S., Bromley, S., Clements, E., Deschenes, J. D., Diddams, S. A., Fasano, R., Fortier, T. M., Hassan, Y., Hume, D. H., Kedar, D., Kennedy, C. J., Khader, I., Koepke, A., Leibrandt, D. R., Leopardi, H., Ludlow, A. & 13 others, , 15 May 2020, In: Cleo. F183, STh3G.3.Research output: Contribution to journal › Conference article › Research › peer-review
- Published
AEDGE: Atomic Experiment for Dark Matter and Gravity Exploration in Space
El-Neaj, Y. A., Alpigiani, C., Amairi-Pyka, S., Araujo, H., Balaz, A., Belic, A., Bentine, E., Bernabeu, J., Bingham, R., Bolpasi, V., Bowden, W., Buchmueller, O., Burrage, C., Calmet, X., Canuel, B., Charmandaris, V., Chen, X., Coleman, J., Cotter, J., Cui, Y. & 69 others, , 4 Mar 2020, In: EPJ Quantum Technology. 7, 1, 27 p., 6.Research output: Contribution to journal › Journal article › Research › peer-review
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Atomic clock performance enabling geodesy below the centimetre level
McGrew, W. F., Zhang, X., Fasano, R. J., Schäffer, Stefan Alaric, Beloy, K., Nicolodi, D., Brown, R. C., Hinkley, N., Milani, G., Schioppo, M., Yoon, T. H. & Ludlow, A. D., 6 Dec 2018, In: Nature. 564, 7734, p. 87-90Research output: Contribution to journal › Journal article › Research › peer-review
- Published
Cavity-enhanced optical clocks
Schäffer, Stefan Alaric, 2019, Niels Bohr Institute, Faculty of Science, University of Copenhagen.Research output: Book/Report › Ph.D. thesis › Research
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Collectively enhanced Ramsey readout by cavity sub- to superradiant transition
Bohr, Eliot, Kristensen, Sofus Laguna, Hotter, C., Schäffer, Stefan Alaric, Robinson-Tait, Julian Curry, Thomsen, Jan Westenkær, Zelevinsky, Tanya, Ritsch, H. & Müller, Jörg Helge, 5 Feb 2024, In: Nature Communications. 15, 7 p., 1084.Research output: Contribution to journal › Journal article › Research › peer-review
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Det aktive atomur - en laser i sin reneste form
Tang, M. & Schäffer, Stefan Alaric, 1 Dec 2018, In: Kvant. 4, p. 20-23Research output: Contribution to journal › Journal article › Communication
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Dynamics of bad-cavity-enhanced interaction with cold Sr atoms for laser stabilization
Schäffer, Stefan Alaric, Christensen, B. T. R., Henriksen, M. R. & Thomsen, Jan Westenkær, 24 Jul 2017, In: Physical Review A. 96, 1, 013847.Research output: Contribution to journal › Journal article › Research › peer-review
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Faraday-Shielded dc Stark-Shift-Free Optical Lattice Clock
Beloy, K., Zhang, X., McGrew, W. F., Hinkley, N., Yoon, T. H., Nicolodi, D., Fasano, R. J., Schäffer, Stefan Alaric, Brown, R. C. & Ludlow, A. D., 2 May 2018, In: Physical Review Letters. 120, 18, 5 p., 183201.Research output: Contribution to journal › Journal article › Research › peer-review
Frequency ratio measurements at 18-digit accuracy using an optical clock network
Boulder Atomic Clock Optical Network (BACON) Collaboration*, B. A. C. O. N. (. C., 25 Mar 2021, In: Nature. 591, 7851, p. 564-569 6 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Incorporating an Optical Clock into a Time Scale at NIST: Simulations and Preliminary Real-Data Analysis
Sherman, J., Fortier, T., Yao, J., Parker, J., Levine, T., Savory, J., Romisch, S., McGrew, W., Zhang, X., Nicolodi, D., Fasano, R., Schäffer, Stefan Alaric, Beloy, K. & Ludlow, A., 29 Jan 2018, Proceedings of the 49th Annual Precise Time and Time Interval Systems and Applications Meeting. Reston, Virginia : Wiley, p. 11-21Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review
- Published
Large waist cavity for ultra-narrow transition spectroscopy
Schäffer, Stefan Alaric, Adsersen, S. S., Christensen, B. T. R. & Thomsen, Jan Westenkær, 12 Apr 2015, 2015 Joint Conference of the IEEE International Frequency Control Symposium & the European Frequency and Time Forum . IEEE ed. Denver,CO, p. 625-629 15285778. (IEEE International Frequency Control Symposium & the European Frequency and Time Forum; No. 15285778).Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review
- Published
Laser stabilization on velocity dependent nonlinear dispersion of Sr atoms in an optical cavity: In Frequency Control Symposium & the European Frequency and Time Forum
Christensen, B. T. R., Schäffer, Stefan Alaric, Henriksen, M. R., Westergaard, P. G., Ye, J. & Thomsen, Jan Westenkær, 10 Apr 2015, In: Proceedings of the IEEE. p. 357-362Research output: Contribution to journal › Conference article › Research › peer-review
- Published
Lasing on a narrow transition in a cold thermal strontium ensemble
Schäffer, Stefan Alaric, Tang, M., Henriksen, M. R., Jørgensen, Asbjørn Arvad, Christensen, B. T. R. & Thomsen, Jan Westenkær, 17 Jan 2020, In: Physical Review A. 101, 1, 9 p., 013819.Research output: Contribution to journal › Journal article › Research › peer-review
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Nonlinear spectroscopy of Sr atoms in an optical cavity for laser stabilization
Christensen, B. T. R., Henriksen, M. R., Schäffer, Stefan Alaric, Westergaard, P. G., Ye, J., Holland, M. & Thomsen, Jan Westenkær, 6 Nov 2015, In: Physical Review A (Atomic, Molecular and Optical Physics). 92, 053820.Research output: Contribution to journal › Journal article › Research › peer-review
Optical atomic clock comparison through turbulent air
Bodine, M. I., Deschênes, J. D., Khader, I. H., Swann, W. C., Leopardi, H., Beloy, K., Bothwell, T., Brewer, S. M., Bromley, S. L., Chen, J. S., Diddams, S. A., Fasano, R. J., Fortier, T. M., Hassan, Y. S., Hume, D. B., Kedar, D., Kennedy, C. J., Koepke, A., Leibrandt, D. R., Ludlow, A. D. & 15 others, , Sep 2020, In: Physical Review Research. 2, 3, 033395.Research output: Contribution to journal › Journal article › Research › peer-review
- Published
Optical frequency measurements at 1x10(-18) uncertainty with ytterbium optical lattice clocks
Ludlow, A. D., McGrew, W. F., Zhang, X., Nicolodi, D., Fasano, R. J., Schäffer, Stefan Alaric, Brown, R. C., Fox, R. W., Hinkley, N., Yoon, T. H. & Beloy, K., 8 Jul 2018, 2018 Conference on Precision Electromagnetic Measurements (CPEM). Paris, France: IEEEResearch output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review
Optical-Clock-Based Time Scale
Yao, J., Sherman, J. A., Fortier, T., Leopardi, H., Parker, T. E., McGrew, W., Zhang, X., Nicolodi, D., Fasano, R., Schäffer, Stefan Alaric, Beloy, K., Savory, J., Romisch, S., Oates, C., Diddams, S., Ludlow, A. D. & Levine, J., 30 Oct 2019, In: Physical Review Applied. 12, 4, 10 p., 044069.Research output: Contribution to journal › Journal article › Research › peer-review
- Published
Progress on optical- clock-based time scale at NIST: Simulations and preliminary real-data analysis
Yao, J., Sherman, J., Fortier, T., Leopardi, H., Parker, T., Levine, J., Savory, J., Romisch, S., McGrew, W., Zhang, X., Nicolodi, D., Fasano, R., Schäffer, Stefan Alaric, Beloy, K. & Ludlow, A., 19 Sep 2018, In: Navigation. 248, p. 1-8Research output: Contribution to journal › Conference article › Research › peer-review
- Published
Prospects of a superradiant laser based on a thermal or guided beam of 88Sr
Tang, M., Schäffer, Stefan Alaric & Müller, Jörg Helge, 9 Dec 2022, In: Physical Review A. 106, 6, 10 p., 063704.Research output: Contribution to journal › Journal article › Research › peer-review
- Published
Towards Molecular Clocks Using Large Waist Cavity Enhanced Spectroscopy: FACT workshop
Adsersen, S. S., Henriksen, M. R., Schäffer, Stefan Alaric & Thomsen, Jan Westenkær, 1 Sep 2015Research output: Other contribution › Research
Towards an Active Optical Clock using an Optical Conveyor within a Ring Cavity
Kazakov, G., Dubey, S., Fama, F., Zhou, Z. S., Beli Silva, C., Schäffer, Stefan Alaric, Bennetts, S. & Schreck, F., 7 Jul 2021, 2021 Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium, EFTF/IFCS 2021 - Proceedings. Gainesville, Fl, USA: IEEE, Vol. 21403938.Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review
- Published
Towards passive and active laser stabilization using cavity-enhanced atomic interaction
Schäffer, Stefan Alaric, Christensen, B. T. R., Rathmann, S. M., Appel, Martin Hayhurst, Henriksen, M. R. & Thomsen, Jan Westenkær, 19 Jun 2017, In: Journal of Physics - Conference Series. 810, 1, 7 p., 012002.Research output: Contribution to journal › Journal article › Research › peer-review
- Published
Towards the optical second: verifying optical clocks at the SI limit
McGrew, W. F., Zhang, X., Leopardi, H., Fasano, R. J., Nicolodi, D., Beloy, K., Yao, J., Sherman, J. A., Schäffer, Stefan Alaric, Savory, J., Brown, R. C., Romisch, S., Oates, C. W., Parker, T. E., Fortier, T. M. & Ludlow, A. D., 20 Apr 2019, In: Optica. 6, 4, p. 448-454Research output: Contribution to journal › Journal article › Research › peer-review
ID: 143261181
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Towards passive and active laser stabilization using cavity-enhanced atomic interaction
Research output: Contribution to journal › Journal article › Research › peer-review
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Towards the optical second: verifying optical clocks at the SI limit
Research output: Contribution to journal › Journal article › Research › peer-review
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55
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AEDGE: Atomic Experiment for Dark Matter and Gravity Exploration in Space
Research output: Contribution to journal › Journal article › Research › peer-review
Published