Jan Westenkær Thomsen

Jan Westenkær Thomsen

Head of Department, Professor


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1 - 50 out of 63Page size: 50
  1. 2024
  2. Published

    Collectively enhanced Ramsey readout by cavity sub- to superradiant transition

    Bohr, Eliot, Kristensen, Sofus Laguna, Hotter, C., Schäffer, Stefan Alaric, Robinson-Tait, J. C., 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

  3. 2023
  4. Published

    Subnatural Linewidth Superradiant Lasing with Cold 88Sr Atoms

    Kristensen, Sofus Laguna, Bohr, Eliot, Robinson-Tait, J., Zelevinsky, Tanya, Thomsen, Jan Westenkær & Müller, Jörg Helge, 2 Jun 2023, In: Physical Review Letters. 130, 22, 5 p., 223402.

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

  5. 2022
  6. Published

    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

  7. 2021
  8. Published

    Cavity-immune spectral features in the pulsed superradiant crossover regime

    Tang, M., Schaffer, S. A., Jørgensen, Asbjørn Arvad, Henriksen, M. R., Christensen, B. T. R., Müller, Jörg Helge & Thomsen, Jan Westenkær, 17 Sep 2021, In: Physical Review Research. 3, 3, 9 p., 033258.

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

  9. 2020
  10. Published

    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

  11. 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

  12. 2019
  13. Published

    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., 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, Jan Westenkær, 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

  14. 2017
  15. Published

    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

  16. 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

  17. Published

    Towards Actively Stabilized Micro Ring Resonator Based Frequency Combs

    Henriksen, M. R., Kamel, A. N., Pu, M., Yvind, K. & Thomsen, Jan Westenkær, 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

  18. 2016
  19. Published

    Compact, CO2-stabilized tuneable laser at 2.05 microns

    Westergaard, P. G., Thomsen, Jan Westenkær, 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

  20. 2015
  21. Published

    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

  22. 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 2015

    Research output: Other contribution › Research

  23. Published

    Laser stabilization using saturated absorption in a cavity-QED system

    Tieri, D. A., Cooper, J., Christensen, B. T. R., Thomsen, Jan Westenkær & 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 › Research › peer-review

  24. 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

  25. 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. 357-362

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

  26. Published

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

    Kjoller, K., Porsev, S. G., Westergaard, P. G., Andersen, Nils Overgaard & Thomsen, Jan Westenkær, 26 Mar 2015, In: Physical Review A (Atomic, Molecular and Optical Physics). 91, 3, 032515.

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

  27. Published

    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, Jan Westenkær, 4 Mar 2015, In: Physical Review Letters. 114, 9, 093002.

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

  28. 2013
  29. Published

    A classroom demonstration of reciprocal space

    Madsen, M. H., Høpfner, L., Rasmussen, N., Stolborg, M., Nygård, Jesper, Feidenhans'l, Robert Krarup & Thomsen, Jan Westenkær, 18 Mar 2013, In: American Journal of Physics. 81, 4, 7 p., 274.

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

  30. 2011
  31. Published

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

    Martin, M. J., Meiser, D., Thomsen, Jan Westenkær, 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 › Research › peer-review

  32. Published

    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, Jan Westenkær, 7 Sep 2011, In: Physical Review Letters. 107, 11, p. 113001 5 p.

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

  33. 2010
  34. Published

    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, Jan Westenkær, 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 › Research › peer-review

  35. Published

    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, Jan Westenkær, 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 › Research › peer-review

  36. 2009
  37. Published

    Isotope shifts of the (3s3p) 3P0,1,2-(3s4s) 3S1 Mg I transitions

    He, M., Therkildsen, K. T., Jensen, B. B., Brusch, A., Thomsen, Jan Westenkær & 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 › Research › peer-review

  38. Published

    Measurement of the spin-forbidden decay rate (3s3d)1D2¿(3s3p)3 P2,1 in 24Mg

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

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

  39. Published

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

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

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

  40. Published

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

    Blatt, S., Thomsen, Jan Westenkær, 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

  41. Published

    Ultracold group II atoms: Quantum metrology and information

    Campbell, G., Lodewyck, J. & Thomsen, Jan Westenkær, 2009, Maryland

    Research output: Other contribution › Research

  42. 2008
  43. Published

    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, Jan Westenkær, 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

  44. Published

    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, Jan Westenkær, 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

  45. Published

    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, Jörg Helge, Hald, J. & Thomsen, Jan Westenkær, 2008, In: Physical Review A (Atomic, Molecular and Optical Physics). 77, 6, p. 062502

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

  46. Published

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

    Blatt, S., Ludow, A., Campbell, G. & Thomsen, Jan Westenkær, 2008, In: Physical Review Letters. 100, 14, p. 140801

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

  47. Published

    Resonant energy transfer in Bose-Einstien condensates

    Nicolin, A., Jensen, Mogens Høgh, Thomsen, Jan Westenkær & 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

  48. Published

    The absolute frequency of the 87Sr optical clock transition

    Campbell, G. K., Ludlow, A. D., Blatt, S., Thomsen, Jan Westenkær, 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

  49. Published

    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, Jan Westenkær, 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

  50. 2007
  51. Published

    Coherent quantum engineering of free-space laser cooling

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

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

  52. 2005
  53. Published

    Two-photon cooling of magnesium atoms

    Malossi, N., Damkjær, S., Hansen, P. L., Jacobsen, L. B., Kindt, L., Sauge, S., Thomsen, Jan Westenkær, 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 › Research › peer-review

  54. 2004
  55. Published

    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, Jan Westenkær & Andersen, Nils Overgaard, 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

  56. Published

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

    Loo, F. Y., Brusch, A., Sauge, S., Allegrini, M., Arimondo, E., Andersen, Nils Overgaard & Thomsen, Jan Westenkær, 2004, In: Journal of Optics B. 6, 1, p. 81-85

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

  57. 2003
  58. Published

    Noter til kvante optik

    Thomsen, Jan Westenkær, 2003, Museum Tusculanum. 65 p.

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

  59. 2002
  60. Published

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

    Pieksma, M., Cizek, M., Thomsen, Jan Westenkær, 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 › Research › peer-review

  61. Published

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

    Madsen, D. N., Yu, P., Balslev, S. & Thomsen, Jan Westenkær, 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

  62. Published

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

    Madsen, D. N. & Thomsen, Jan Westenkær, 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 › Research › peer-review

  63. Published

    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, Nils Overgaard, Dubois, A., Houver, J. C., Nielsen, S. E., Richter, C., Salgado, J., Svensson, Anders & Thomsen, Jan Westenkær, 2002, In: Journal of Physics B. 35, 9, p. 2051-2068 17 p.

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

  64. Published

    Photoionization of ultracold and Bose-Einstein condensed Rb atoms

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

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

  65. 2000
  66. Published

    Fysik med Ultrakolde Atomer

    Thomsen, Jan Westenkær, 2000, In: Carlsberg Årsskrift. 1, p. 16-20

    Research output: Contribution to journal › Journal article › Research

  67. Published

    Photoassociation spectroscopy of cold He(23S) atoms

    Thomsen, Jan Westenkær, 2000, In: Physical Review Letters. 84, 9, p. 1874-1877 3 p.

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

  68. 1999
  69. Published

    Spatial dependence of electron transfer from optically prepared states: Li+ +Na(3p) -> Li(2p) + Na+

    Andersen, N. & Thomsen, Jan Westenkær, 1999, In: Journal of Physics B: Atomic, Molecular and Optical Physics. 32, p. 5189-5204

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

  70. Published

    Spatial dependence of electron transfer from optically prepared states: Li+ + Na(3p) ¿: Li(2p) + Na+

    Thomsen, Jan Westenkær, Salgado, J., Andersen, Nils Overgaard, Dowek, D., Dubois, A., Houver, J. C., Nielsen, S. E. & Svensson, Anders, 1999, In: J. Phys. B: At. Mol. Opt. Phys.. 32, p. 5189-5204

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

  71. 1997
  72. Published

    State propensities in electron transfer processes from optically prepared states: H+ + Na(3s,3p) ¿ H(n=2,3) + Na+

    Salgado, J., Thomsen, Jan Westenkær, Andersen, Nils Overgaard, Dowek, D., Dubois, A., Houver, J. C., Nielsen, S. E., Reiser, I. & Svensson, Anders, 1997, In: Journal of Physics B: Atomic, Molecular and Optical Physics. 30, 13, p. 3059-3075

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

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