Jan Westenkær Thomsen

2024

Collectively enhanced Ramsey readout by cavity sub- to superradiant transition

Bohr, E., Kristensen, S. L., Hotter, C., Schäffer, S. A., Robinson-Tait, J. C., Thomsen, J. W., Zelevinsky, T., Ritsch, H. & Müller, J. H., 5 Feb 2024, In: Nature Communications. 15, 7 p., 1084.

Research output: Contribution to journal › Journal article › Research › peer-review

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5 Citations (Scopus)

60 Downloads (Pure)

2023

Subnatural Linewidth Superradiant Lasing with Cold ⁸⁸Sr Atoms

Kristensen, S. L., Bohr, E., Robinson-Tait, J., Zelevinsky, T., Thomsen, J. W. & Müller, J. H., 2 Jun 2023, In: Physical Review Letters. 130, 22, 5 p., 223402.

Research output: Contribution to journal › Letter › peer-review

Open Access

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10 Citations (Scopus)

11 Downloads (Pure)

2022

Petabit-per-second data transmission using a chip-scale microcomb ring resonator source

Jorgensen, A. A., Kong, D., Henriksen, M. R., Klejs, F., Ye, Z., Helgason, O. B., Hansen, H. E., Hu, H., Yankov, M., Forchhammer, S., Andrekson, P., Larsson, A., Karlsson, M., Schroder, J., Sasaki, Y., Aikawa, K., Thomsen, J. W., Morioka, T., Galili, M., Torres-Company, V. & 1 others, Oxenlowe, L. K., 20 Oct 2022, In: Nature Photonics. 16, p. 798-802 8 p.

Research output: Contribution to journal › Journal article › Research › peer-review

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86 Citations (Scopus)

230 Downloads (Pure)

2021

Cavity-immune spectral features in the pulsed superradiant crossover regime

Tang, M., Schaffer, S. A., Jorgensen, A. A., Henriksen, M. R., Christensen, B. T. R., Muller, J. H. & Thomsen, J. W., 17 Sep 2021, In: Physical Review Research. 3, 3, 9 p., 033258.

Research output: Contribution to journal › Journal article › Research › peer-review

Open Access

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10 Citations (Scopus)

57 Downloads (Pure)

2020

Lasing on a narrow transition in a cold thermal strontium ensemble

Schäffer, S. A., Tang, M., Henriksen, M. R., Jørgensen, A. A., Christensen, B. T. R. & Thomsen, J. W., 17 Jan 2020, In: Physical Review A. 101, 1, 9 p., 013819.

Research output: Contribution to journal › Journal article › Research › peer-review

Open Access

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47 Citations (Scopus)

36 Downloads (Pure)

Single Dark-Pulse Kerr Comb Supporting 1.84 Pbit/s Transmission over 37-Core Fiber

Kong, D., Jorgensen, A. A., Henriksen, M. R., Klejs, F., Ye, Z., Helgason, O. B., Hansen, H. E., Hu, H., Yankov, M., Forchhammer, S., Andrekson, P., Larsson, A., Karlsson, M., Schroeder, J., Sasaki, Y., Aikawa, K., Thomsen, J. W., Morioka, T., Galili, M., Torres-Company, V. & 1 others, Oxenlowe, L. K., 10 May 2020, 2020 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO). San Jose, California, USA: IEEE, 2 p. JTh4A.7. (Conference on Lasers and Electro-Optics).

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

Open Access

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4 Citations (Scopus)

103 Downloads (Pure)

2019

SAGE: A proposal for a space atomic gravity explorer

Tino, G. M., Bassi, A., Bianco, G., Bongs, K., Bouyer, P., Cacciapuoti, L., Capozziello, S., Chen, X., Chiofalo, M. L., Derevianko, A., Ertmer, W., Gaaloul, N., Gill, P., Graham, P. W., Hogan, J. M., Iess, L., Kasevich, M. A., Katori, H., Klempt, C., Lu, X. & 27 others, Ma, L-S., Mueller, H., Newbury, N. R., Oates, C. W., Peters, A., Poli, N., Rasel, E. M., Rosi, G., Roura, A., Salomon, C., Schiller, S., Schleich, W., Schlippert, D., Schreck, F., Schubert, C., Sorrentino, F., Sterr, U., Thomsen, J. W., Vallone, G., Vetrano, F., Villoresi, P., von Klitzing, W., Wilkowski, D., Wolf, P., Ye, J., Yu, N. & Zhan, M., 1 Nov 2019, In: The European Physical Journal D: Atomic, Molecular, Optical and Plasma Physics. 73, 11, 228.

Research output: Contribution to journal › Journal article › Research › peer-review

85 Citations (Scopus)

2017

Dynamics of bad-cavity-enhanced interaction with cold Sr atoms for laser stabilization

Schäffer, S. A., Christensen, B. T. R., Henriksen, M. R. & Thomsen, J. W., 24 Jul 2017, In: Physical Review A. 96, 1, 013847.

Research output: Contribution to journal › Journal article › peer-review

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17 Citations (Scopus)

Towards Actively Stabilized Micro Ring Resonator Based Frequency Combs

Henriksen, M. R., Kamel, A. N., Pu, M., Yvind, K. & Thomsen, J. W., 2017, 2017 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO). San Jose, USA: Optical Society of America, JTh2A.88. (Conference on Lasers and Electro-Optics).

Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

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Towards passive and active laser stabilization using cavity-enhanced atomic interaction

Schäffer, S. A., Christensen, B. T. R., Rathmann, S. M., Appel, M. H., Henriksen, M. R. & Thomsen, J. W., 19 Jun 2017, In: Journal of Physics - Conference Series. 810, 1, 7 p., 012002.

Research output: Contribution to journal › Journal article › Research › peer-review

Open Access

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5 Citations (Scopus)

371 Downloads (Pure)

2016

Compact, CO2-stabilized tuneable laser at 2.05 microns

Westergaard, P. G., Thomsen, J. W., Henriksen, M. R., Michieletto, M., Triches, M., Lyngsø, J. K. & Hald, J., 7 Mar 2016, In: Optics Express. 24, 5, p. 4872-4880

Research output: Contribution to journal › Journal article › Research › peer-review

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8 Citations (Scopus)

2015

Hyperfine structure of the (3s3d)³J manifold of ²⁵Mg I

Kjoller, K., Porsev, S. G., Westergaard, P. G., Andersen, N. O. & Thomsen, J. W., 26 Mar 2015, In: Physical Review A (Atomic, Molecular and Optical Physics). 91, 3, 032515.

Research output: Contribution to journal › Journal article › peer-review

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Large waist cavity for ultra-narrow transition spectroscopy

Schäffer, S. A., Adsersen, S. S., Christensen, B. T. R. & Thomsen, J. W., 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

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1 Citation (Scopus)

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, S. A., Henriksen, M. R., Westergaard, P. G., Ye, J. & Thomsen, J. W., 10 Apr 2015, In: Proceedings of the IEEE. p. 357-362

Research output: Contribution to journal › Conference article › Research › peer-review

Laser stabilization using saturated absorption in a cavity-QED system

Tieri, D. A., Cooper, J., Christensen, B. T. R., Thomsen, J. W. & Holland, M. J., 10 Jul 2015, In: Physical Review A (Atomic, Molecular and Optical Physics). 92, 1, 013817.

Research output: Contribution to journal › Journal article › peer-review

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11 Citations (Scopus)

Nonlinear spectroscopy of Sr atoms in an optical cavity for laser stabilization

Christensen, B. T. R., Henriksen, M. R., Schäffer, S. A., Westergaard, P. G., Ye, J., Holland, M. & Thomsen, J. W., 6 Nov 2015, In: Physical Review A (Atomic, Molecular and Optical Physics). 92, 053820.

Research output: Contribution to journal › Journal article › peer-review

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26 Citations (Scopus)

Observation of Motion-Dependent Nonlinear Dispersion with Narrow-Linewidth Atoms in an Optical Cavity

Westergaard, P. G., Christensen, B. T. R., Tieri, D., Matin, R., Cooper, J., Holland, M., Ye, J. & Thomsen, J. W., 4 Mar 2015, In: Physical Review Letters. 114, 9, 093002.

Research output: Contribution to journal › Journal article › Research › peer-review

File

27 Citations (Scopus)

Towards Molecular Clocks Using Large Waist Cavity Enhanced Spectroscopy: FACT workshop

Adsersen, S. S., Henriksen, M. R., Schäffer, S. A. & Thomsen, J. W., 1 Sep 2015

Research output: Other contribution › Research

2013

A classroom demonstration of reciprocal space

Madsen, M. H., Høpfner, L., Rasmussen, N., Stolborg, M., Nygård, J., Feidenhans'l, R. K. & Thomsen, J. W., 18 Mar 2013, In: American Journal of Physics. 81, 4, 7 p., 274.

Research output: Contribution to journal › Journal article › Research › peer-review

5 Citations (Scopus)

2011

Experimental Determination of the ²⁴Mg I (3s3p)³P₂ Lifetime

Jensen, B. B., He, M., Westergaard, P. G., Gunarsson, K., Madsen, M. H., Brusch, A., Hald, J. & Thomsen, J. W., 7 Sep 2011, In: Physical Review Letters. 107, 11, p. 113001 5 p.

Research output: Contribution to journal › Journal article › Research › peer-review

12 Citations (Scopus)

Extreme nonlinear response of ultranarrow optical transitions in cavity QED for laser stabilization

Martin, M. J., Meiser, D., Thomsen, J. W., Ye, J. & Holland, M. J., 5 Dec 2011, In: Physical Review A (Atomic, Molecular and Optical Physics). 84, 6, p. 063813

Research output: Contribution to journal › Journal article › peer-review

29 Citations (Scopus)

2010

Measurement of the (3s3p)¹ P–(3s3d)¹ D isotope shift in Mg¿

Steenstrup, M. P. H., Brusch, A., Hald, J., Jensen, B. B. & Thomsen, J. W., 12 Nov 2010, In: Physical Review A (Atomic, Molecular and Optical Physics). 82, 5, p. 054501 3 p.

Research output: Contribution to journal › Journal article › peer-review

2 Citations (Scopus)

Precision measurement of fermionic collisions using an ⁸⁷Sr optical lattice clock with 1 × 10^-16 inaccuracy

Swallows....[et al.], M. D., Campbell, G. K., Boyd, M. M. & Thomsen, J. W., 4 Mar 2010, In: IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control. 57, 3, p. 574-582 8 p.

Research output: Contribution to journal › Conference article › peer-review

11 Citations (Scopus)

2009

Isotope shifts of the (3s3p) ³P_0,1,2-(3s4s) ³S₁ Mg I transitions

He, M., Therkildsen, K. T., Jensen, B. B., Brusch, A., Thomsen, J. W. & Porsev, S. G., 2009, In: Physical Review A (Atomic, Molecular and Optical Physics). 80, 2, p. 024501 4 p.

Research output: Contribution to journal › Journal article › peer-review

2 Citations (Scopus)

Measurement of the spin-forbidden decay rate (3s3d)¹D2¿(3s3p)³ P_2,1 in ²⁴Mg

Therkildsen, K. T., Jensen, B. B., Ryder, C. P., Malossi, N. & Thomsen, J. W., 2009, In: Physical Review A (Atomic, Molecular and Optical Physics). 79, 3, p. 034501 4 p.

Research output: Contribution to journal › Journal article › peer-review

3 Citations (Scopus)

Metastable Magnesium fluorescence spectroscopy using a frequency-stabilized 517 nm laser

He, M., Jensen, B. B., Therkildsen, K. T., Brusch, A. & Thomsen, J. W., 2009, In: Optics Express. 17, 9, p. 7682-7687 5 p.

Research output: Contribution to journal › Journal article › Research › peer-review

3 Citations (Scopus)

Rabi spectroscopy and excitation inhomogeneity in a one-dimensional optical lattice clock

Blatt, S., Thomsen, J. W., Campbell, G. K., Ludlow, A. D., Swallows, M. D., Martin, M. J., Boyd, M. M. & Ye, J., 2009, In: Physical Review A (Atomic, Molecular and Optical Physics). 80, 5, p. 052703

Research output: Contribution to journal › Journal article › Research › peer-review

137 Citations (Scopus)

Ultracold group II atoms: Quantum metrology and information

Campbell, G., Lodewyck, J. & Thomsen, J. W., 2009, Maryland

Research output: Other contribution › Research

2008

Amplification and ASE suppression in a polarization-maintaining ytterbium-doped all-solid photonic bandgap fibre

Olausson, C. B., Falk, C. I., Lyngso, J. K., Jensen, B. B., Therkildsen, K. T., Thomsen, J. W., Hansen, K. P., Bjarklev, A. & Broeng, J., 2008, In: Optics Express. 16, 18, p. 13657-13662

Research output: Contribution to journal › Journal article › Research › peer-review

46 Citations (Scopus)

Characterization of a magnetic trap by polarization dependent Zeeman spectroscopy

Nielsen, C. V., Lyngsø, J. K., Thorseth, A., Galouzis, M., Therkildsen, K. T., van Ooijen, E. D. & Thomsen, J. W., 2008, In: European Physical Journal D : Atomic, Molecular and Optical Physics. 48, 1, p. 111-119

Research output: Contribution to journal › Journal article › Research › peer-review

1 Citation (Scopus)

Measurement of the 3s3p ^-3P₁ lifetime in magnesium using a magneto-optical trap

Hansen, P. L., Therkildsen, K. T., Malossi, N., Jensen, B. B., van Ooijen, E. D., Brusch, A., Müller, J. H., Hald, J. & Thomsen, J. W., 2008, In: Physical Review A (Atomic, Molecular and Optical Physics). 77, 6, p. 062502

Research output: Contribution to journal › Journal article › peer-review

11 Citations (Scopus)

New limits on coupling of fundamental constants to gravity using ⁸⁷Sr optical lattice clocks

Blatt, S., Ludow, AD., Campbell, GK. & Thomsen, J. W., 2008, In: Physical Review Letters. 100, 14, p. 140801

Research output: Contribution to journal › Journal article › Research › peer-review

271 Citations (Scopus)

Resonant energy transfer in Bose-Einstien condensates

Nicolin, A., Jensen, M. H., Thomsen, J. W. & Carretero-Gonxález, R., 2008, In: Physica D : Non-linear Phenomena. 237, 19, p. 2476-2481

Research output: Contribution to journal › Journal article › Research › peer-review

9 Citations (Scopus)

The absolute frequency of the ⁸⁷Sr optical clock transition

Campbell, G. K., Ludlow, A. D., Blatt, S., Thomsen, J. W., Martin, M. J., de Miranda, M. H. G., Zelevinsky, T., Boyd, M. M., Ye, J., Diddams, S. A., Heavner, T. P., Parker, T. E. & Jefferts, S. R., 2008, In: Metrologia. 45, 5, p. 539-548 9 p.

Research output: Contribution to journal › Journal article › Research › peer-review

154 Citations (Scopus)

Ultracold strontium clock: applications to the measurement of fundamental constant variations

Ludlow, A. D., Blatt, S., Zelevinsky, T., Campbell, G. K., Martin, M. J., Thomsen, J. W., Boyd, M. M. & Ye, J., 2008, In: European Physical Journal. Special topics. 163, 1, p. 9-18 9 p.

Research output: Contribution to journal › Journal article › Research › peer-review

4 Citations (Scopus)

2007

Coherent quantum engineering of free-space laser cooling

Dunn, J. W., Thomsen, J. W. & Greene, C. H., 2007, In: Physical Review A (Atomic, Molecular and Optical Physics). 76, 1, p. 011401

Research output: Contribution to journal › Journal article › peer-review

14 Citations (Scopus)

2005

Two-photon cooling of magnesium atoms

Malossi, N., Damkjær, S., Hansen, P. L., Jacobsen, L. B., Kindt, L., Sauge, S., Thomsen, J. W., Cruz, F. C., Allegrini, M. & Arimondo, E., 2005, In: Physical Review A (Atomic, Molecular and Optical Physics). 72, p. 051403(R) 4 p.

Research output: Contribution to journal › Journal article › peer-review

30 Citations (Scopus)

2004

Electron transfer from optically prepared states: He⁺ + Na (3² P)¿ He (2 ^1,3 P)+ Na⁺angular differential sacttering

Nielsen, S. E., Rod, T. H., Salgado, J., Dowek, D., Houver, J. C., Thomsen, J. W. & Andersen, N. O., 2004, In: Journal of Physics B: Atomic, Molecular and Optical Physics. 37, 10, p. 2119-2133

Research output: Contribution to journal › Journal article › Research › peer-review

3 Citations (Scopus)

Investigations of a two-level atom in a magneto-optical trap

Loo, F. Y., Brusch, A., Sauge, S., Allegrini, M., Arimondo, E., Andersen, N. O. & Thomsen, J. W., 2004, In: Journal of Optics B. 6, 1, p. 81-85

Research output: Contribution to journal › Journal article › Research › peer-review

26 Citations (Scopus)

2003

Noter til kvante optik

Thomsen, J. W., 2003, Museum Tusculanum. 65 p.

Research output: Book/Report › Compendium/lecture notes › Education

2002

Energy distribution of He⁺ and He₂⁺ ions formed in ultracold He(2³S₁)+ He(2³P₂) collisions

Pieksma, M., Cizek, M., Thomsen, J. W., Van der Straten, P. & Niehaus, A., 2002, In: Physical Review A (Atomic, Molecular and Optical Physics). 66, 2, p. 022703

Research output: Contribution to journal › Journal article › peer-review

1 Citation (Scopus)

Generation of 99-mW continuous-wave 285-nm radiation for magneto-optical trapping of Mg atoms

Madsen, D. N., Yu, P., Balslev, S. & Thomsen, J. W., 2002, In: Applied physics. B, Lasers and optics (Print). 75, 8, p. 835-839 4 p.

Research output: Contribution to journal › Journal article › Research › peer-review

2 Citations (Scopus)

Measurement of absolute photo-ionization cross sections using magnesium magneto-optical traps

Madsen, D. N. & Thomsen, J. W., 2002, In: Journal of Physics B: Atomic, Molecular and Optical Physics. 35, 9, p. 2173-2181 8 p.

Research output: Contribution to journal › Journal article › peer-review

24 Citations (Scopus)

Photoionization of ultracold and Bose-Einstein condensed Rb atoms

Campini, D., Anderlini, M., Muller, J. H., Fuso, F., Morsch, O., Thomsen, J. W. & Arimondo, E., 2002, In: Physical Review A (Atomic, Molecular and Optical Physics). 66, 6, p. 043409

Research output: Contribution to journal › Journal article › peer-review

40 Citations (Scopus)

P-state-to-P-state transitions in optically prepared atomic collisions: III. A complete analysis of Li⁺ + Na(3p)¿Li(2p) + Na⁺ differential scattering

Dowek, D., Reiser, I., Grego, S., Andersen, N. O., Dubois, A., Houver, J. C., Nielsen, S. E., Richter, C., Salgado, J., Svensson, A. & Thomsen, J. W., 2002, In: Journal of Physics B. 35, 9, p. 2051-2068 17 p.

Research output: Contribution to journal › Journal article › peer-review

13 Citations (Scopus)

2000