News since 2014:

• November 2014: Travel grants awarded to the molecular hydrogen spectroscopy teams at VU Amsterdam and LKB Paris by the Van Gogh Programme.
• September 2014: About accurate clocks and SuperGPS positioning: Door meten tot weten (item in VPRO Gids (Dutch)
• August 2014: Altijd op tijd met het White Rabbit protocol: press release about the new nanosecond White Rabbit Ethernet and timing link between the atomic clocks at VSL Delft and Science Park Amsterdam, over 137 km of SURFnet optical fiber (Dutch)
• May 2014: Live radio item in De Nationale Autoshow at BNR Nieuwsradio about self-driving cars and the SuperGPS project (Dutch)
• April 2014:News article about SuperGPS in Eindhovens Dagblad (Dutch)
• January 2014: We founded a new company! Systems for fiber-optic 'SuperGPS' timing now available commercially from OPNT B.V.
• Scientific publication:
  "Delivering 10 Gb/s optical data with picosecond timing uncertainty over 75 km distance", N. Sotiropoulos, C.M. Okonkwo, R. Nuijts, H. de Waardt, J.C.J. Koelemeij, to appear in Optics Express
• A copy (.pdf) of my tutorial on UHV technology (IonTech2 meeting, Paris, Oct 2013) is available here
• Scientific publication:
  "Two-photon spectroscopy of trapped HD⁺ ions in the Lamb-Dicke regime", V.Q. Tran, J.-Ph. Karr, A. Douillet, J.C.J. Koelemeij, L. Hilico, Phys. Rev. A 88, 033421 (2013)
• July 2013 at BNR Nieuwsradio: Radio commentary on the Sr/Cs atomic clock ensembles in Paris (Dutch)


• Scientific publications:
  "Laser cooling of beryllium ions using a frequency-doubled 626 nm diode laser", F.M.J. Cozijn, J. Biesheuvel, A.S. Flores, W. Ubachs, G. Blume, A. Wicht, K. Paschke, G. Erbert, J.C.J. Koelemeij, Opt. Lett. 38, 2370 (2013)

  see also the summary in OSA's Spotlight on Optics

  "Bounds on fifth forces from precision measurements on molecules", E.J. Salumbides, J.C.J. Koelemeij, J. Komasa, K. Pachucki, K.S.E. Eikema, W. Ubachs, Phys. Rev. D 87, 112008 (2013)
  
  "Widely tunable laser frequency offset lock with 30 GHz range and 5 THz offset", J. Biesheuvel, D.W.E. Noom, E.J. Salumbides, K.T. Sheridan, W. Ubachs, J.C.J. Koelemeij, Opt. Express 21, 14008 (2013)


• December 2012: Interview recorded by Hoe?Zo! radio with Prof. Kobus Kuipers, Dr. Daphne Stam, and JK about the nature of light and its role in science and society
• December 2012: Article in Nederlands Tijdschrift voor Natuurkunde 78(12), 472 (2012)
• October 2012: Nobel Prize in Physics awarded to David J. Wineland (NIST Boulder, USA) and Serge Haroche (ENS Paris, France)
• May 2012: NWO/STW Vidi grant awarded
• March 2012: News article about SuperGPS in de Volkskrant
• March 2012: Article SuperGPS NWT Magazine 3/2012
• June 2011: Article SuperGPS Fotonica Magazine 2, p.5 (June 2011)
• Scientific publication:
  "Observation of the v = 8 - v = 0 vibrational overtone in cold trapped HD⁺",  
  J.C.J. Koelemeij, D.W.E. Noom, D. de Jong, M.A. Haddad, W. Ubachs, Appl. Phys. B 107, 1075-1085(2012)
• Scientific Publication:
  "Infrared dynamic polarizability of HD⁺ rovibrational states",  
  J.C.J. Koelemeij, Physical Chemistry Chemical Physics, DOI: 10.1039/c1cp21204d (2011)
• NIST’s Second ‘Quantum Logic Clock’ Based on Aluminum Ion is Now World’s Most Precise Clock
• Nauwkeurigste klok ooit gebouwd
• Scientific Publication:
  "Frequency Comparison of Two High-Accuracy Al⁺ Optical Clocks",  
  C.W. Chou, D.B. Hume, J.C.J. Koelemeij, D.J. Wineland, T. Rosenband, Physcial Review Letters 104, 070802 (2010)
• NIST Pair of Aluminum Atomic Clocks Reveal Einstein's Relativity at a Personal Scale
• Amerikanen maken nauwkeurigste atoomklok ooit - nu.nl
• Tijd verstrijkt sneller als je op een trapje staat - nu.nl
Media Response / Media-aandacht
• Acknowledgment: Al⁺ work supported through NWO/TALENT fellowshipa