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Home page of Kjeld S. E. Eikema
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Prof. dr. K.S.E. EikemaDirector LaserLaB
Amsterdam
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Research interests:
Precision tests of fundamental physics focusing on QED tests, and determinations of fundamental constants and nuclear size effects, using atoms like helium and helium+ ions and H2 molecules. Other interests: testing the stability of fundamental constants, development of frequency comb lasers, high-power (TW-class) ultrafast lasers and ultrafast phenomena, coherent X-ray generation, ion-trapping, laser-produced plasmas, and lensless imaging with light ranging from infrared to soft-X-ray wavelengths.
Have a look at the home page of my group: Ultrafast Laser Physics and Precision Metrology For Fundamental Tests,
and at this link: EUV Generation and Imaging Group at ARCNL, where I work for 10% of my time.
Teaching
Currently I teach Classical Mechanics in period 1 (September-October) of the first year of the combined UvA-VU Physics curriculum, and Ultrafast Laser Physics in period 4 (February-March) the AMEP track of the Physics Master.
Faculty activities
I am director of the LaserLaB Amsterdam and we organize the annual LaserLaB Symposium (typically in June/July). I have been very involved in the preparations for the move of the whole department to the new VO building (offices and labs, December 2024 to March 2025) and still involved in solving the remaining issues. I was a member of a working group promoting the "Profielthema's" (focus areas) of our university. Apart from these activities I take part in committees for appointing and evaluating staff members, etc.
A short CV
2022 - now: Section head of
Quantum Metrology and Laser Applications2018 - now: Director LaserLaB Amsterdam
2014 - now: Group leader (initially for 30%, now 10% fte) at ARCNL of the EUV Generation and Imaging Group (together with prof. S. Witte).
2013 - now: Full professor at the VU University
2010 - 2015: Professor by special appointment (bijzonder hoogleraar) at the Rijksuniversiteit Groningen - KVI.
2008-2010: Associate professor ('Universitair hoofddocent') at the VU
2003-2008: Assistant professor ('Universitair docent') at the VU
2000/2001-2003: Project leader of a Vernieuwingsimpuls project (VIDI), grant for 5 years
1996-2000: Post-doctoral fellow at the Max-Planck-Institute fuer Quantenoptik, in the group of prof. T.W. Haensch
1991-1996: PhD (cum laude) at the Vrije Universiteit, group of prof. Wim Hogervorst,
Thesis title: QED and the ground state of helium, precision extreme ultraviolet spectroscopy.
1988-1991: Physics at the Vrije Universiteit, Amsterdam
1984-1988: Technical Physics at the 'HTS Rijswijk'
Award/Prize:
Fresnel Prize 2003 (for fundamental aspects) from the European Physical Society
Grants obtained in collaborations (incomplete list):
2025: NWO ENW-M2 grant "Helium (plus) as quantum probe for fundamental constants and new physics", project leader, project is a collaboration with prof. Hendrik Bethlem, total grant 800 kEuro.
2023: NWO ENW-XL grant (program leader dr. Jeroen Koelemeij), total grant 2.3 MEuro
2016: FOM/NWO Program "The mysterious size of the Proton" of 1.8 MEuro
Program leader K.S.E. Eikema, in collaboration with W. Ubachs, W. Vassen, J.C.J. Koelemeij and H.L. Bethlem
2013/2014 Member of the Science Team that wrote the winning proposal for the Advanced Research Center for Nanolithography (ARCNL), that started in 2014 in Amsterdam.
2010 FOM Programme (VU & KVI): "Broken Mirrors and Drifting Constants"
2008 NWO-Groot for an X-ray imaging facility (program leader prof. Erwin Peterman)
2006 FOM Metrology program grant (progam leader prof. Wim Ubachs)
Personal Grants
| In March 2016, I received a European Research Council (ERC) Advanced Grant of 2.5 MEuro to investigate QED and the 'proton radius puzzle' by precision spectroscopy on the 1S-2S transition in trapped helium+ ions. |  |
2013 Projectruimte grant from FOM "Testing the boundaries of QED with He+"
2007 'Vici' grant from NWO
2001 FOM projectruimts FSTO grant
2001 'Vidi' grant from NWO
Selected high-profile publications
Full list of publications
Y. van de Werf, K. Steinebach, R. Jannin, H.L. Bethlem, K.S.E. Eikema,
Alpha and helion charge radius difference determined from quantum degenerate helium,
Science 388, 850-853 (2025)
https://www.science.org/doi/10.1126/science.adj2462
E.L. Gr�ndeman, V. Barb�, Andr�s Martinez de Velasco, C. Roth, M. Collombon, J.J. Krauth, L.S. Dreissen, R. Ta�eb, K.S.E. Eikema
Laser excitation of the 1S-2S transition in singly-ionized helium
Communications Physics 7, 414 (2024)
https://www.nature.com/articles/s42005-024-01891-4
R. Jannin, Y. van der Werf, K. Steinebach, H.L. Bethlem, K.S.E. Eikema,
Pauli blocking of stimulated emission in a degenerate Fermi gas
Nature Communications 13, 6479 (2022)
https://www.nature.com/articles/s41467-022-34135-6
S. Patra, M. Germann, J.-Ph. Karr, M. Haidar, L. Hilico, V.I. Korobov, F.M.J. Cozijn, K.S.E. Eikema, W. Ubachs, J.C.J. Koelemeij
Proton-electron mass ratio from laser spectroscopy of HD+ at the part-per-trillion level
Science 10.1126/science.aba0453 (2020)
https://science.sciencemag.org/content/early/2020/07/29/science.aba0453
M. Beyer, N. Hoelsch, J. Hussels, C.-F. Cheng, E.J. Salumbides, K.S.E. Eikema, W. Ubachs, Ch. Jungen, and F. Merkt
Determination of the interval between the ground states of para- and ortho-H2
Phys. Rev. Lett. 123, 163002 (2019)
https://journals-aps-org.vu-nl.idm.oclc.org/prl/pdf/10.1103/PhysRevLett.123.163002
L.S. Dreissen, C. Roth, E.L. Gruendeman, J.J. Krauth, M. Favier and K.S.E. Eikema
High-precision Ramsey-Comb Spectroscopy Based on High-Harmonic Generation
Phys. Rev. Lett. 123, 143001 (2019)
https://journals-aps-org.vu-nl.idm.oclc.org/prl/pdf/10.1103/PhysRevLett.123.143001
N. Holsch, M. Beyer, E.J. Salumbides, K.S.E. Eikema, W. Ubachs, C. Jungen, F. Merkt
Benchmarking Theory with an Improved Measurement of the Ionization and Dissociation Energies of H2
Phys. Rev. Lett. 122, 103002 (2019)
https://journals-aps-org.vu-nl.idm.oclc.org/prl/pdf/10.1103/PhysRevLett.122.103002
R.J. Rengelink, Y. van der Werf, R.P.M.J.W. Notermans, R. Jannin, K.S.E. Eikema, M.D. Hoogerland, W. Vassen,
Precision spectroscopy of helium in a magnetic wavelength optical dipole trap
Nature Physics 14, 1132 (2018)
https://www.nature.com/articles/s41567-018-0242-5
C-F Cheng, J. Hussels, M. Niu, H.L. Bethlem, K.S.E. Eikema, E.J. Salumbides, W. Ubachs, M. Beyer, N. Holsch, J.A. Agner, F. Merkt, T.G. Tao, S.M. Hu, C. Jungen,
Dissociation Energy of the Hydrogen Molecule at 10(-9) Accuracy
Phys. Rev. Lett. 121, 013001 (2018)
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.121.013001
F.M.J. Cozijn, P. Dupre, E.J. Salumbides, K.S.E. Eikema, W. Ubachs,
Sub-Doppler Frequency Metrology in HD for Tests of Fundamental Physics
Phys. Rev. Lett. 120, 153002 (2018)
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.120.153002
R.K. Altman, L.S. Dreissen, E.J. Salumbides, W. Ubachs and K.S.E. Eikema,
Deep-Ultraviolet Frequency Metrology of H2 for Tests of Molecular quantum Theory
Phys. Rev. Lett. 120, 043204 (2018)
https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.120.043204
R.K. Altmann, S. Galtier, L.S. Dreissen, and K.S.E. Eikema,
High-Precision Ramsey-Comb spectroscopy at Deep-Ultraviolet Wavelengths
Phys. Rev. Lett. 117, 173201 (2016)
http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.117.173201
J. Biesheuvel, J-P Karr, L. Hilico, K.S.E. Eikema, W. Ubachs, J.C.J. Koelemeij,
Probing QED and fundamental constants through laser spectroscopy of vibrational transitions in HD
Nat. Comm. 7, 10385 (2016)
https://www.nature.com/articles/ncomms10385
K.S.E. Eikema,
News and Views: Twisted high-harmonic generation
Nat. Photon. 9, 710-712 (2015)
http://www.nature.com/nphoton/journal/v9/n11/full/nphoton.2015.204.html
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S.M. Witte, V.T. Tenner,
D.W.E. Noom, K.S.E. Eikema Lensless diffractive imaging with ultra-broadband table-top sources: from infrared to extreme ultraviolet wavelengths Light: Science and Applications 3, 1-7 (2014) (open access) http://www.nature.com/lsa/journal/v3/n3/pdf/lsa201444a.pdf |
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J. Morgenweg, I. Barmes and K.S.E. Eikema, Ramsey-comb spectroscopy with intense ultrashort laser pulses Nature Physics 10, 30-33 (2014) http://www.nature.com/nphys/journal/v10/n1/full/nphys2807.html Also see the News and Views by Scott A. Diddams on page 8-9 of the same issue: http://www.nature.com/nphys/journal/v10/n1/full/nphys2852.html |
I. Barmes, S. Witte, K.S.E. Eikema
High-precision spectroscopy with counterpropagating femtosecond pulses
Physical Review Letters 111, 023007 (2013)
http://dx.doi.org/10.1103/PhysRevLett.111.023007
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I. Barmes, S. Witte, K.S.E. Eikema, Spatial and spectral coherent control with frequency combs Nature Photonics 7, 38-42 (2013) http://www.nature.com/nphoton/journal/v7/n1/pdf/nphoton.2012.299.pdf Also see the News and Views article by A. M. Weiner on page 6-8 of the same issue: http://www.nature.com/nphoton/journal/v7/n1/pdf/nphoton.2012.334.pdf |
G.D. Dickenson, M.L. Niu, E.J. Salumbides, J. Komasa, K.S.E. Eikema, K. Pachucki, W. Ubachs
Fundamental Vibration of Molecular Hydrogen
Phys. Rev. Lett. 110, 193601 (2013)
http://dx.doi.org/10.1103/PhysRevLett.110.193601
R. van Rooij, J.S. Borbely, J. Simonet, M.D. Hogerland, K.S.E. Eikema, R.A. Rozendaal, W. Vassen,
Frequency metrology in quantum degenerate helium: direct measurement of the 2 3S1 - 2 1S0 transition
Science 333, 196-198 (2011)
http://www.sciencemag.org/content/333/6039/196
K.S.E. Eikema,
Frequency Combs liberated from material dispersion
Nature Photonics 5, 258-260 (2011) (News and Views)
http://www.nature.com/nphoton/journal/v5/n5/full/nphoton.2011.70.html?WT.ec_id=NPHOTON-201105
D.Z. Kandula, C. Gohle, T.J. Pinkert, W. Ubachs, K.S.E. Eikema,
Extreme Ultraviolet Frequency Comb Metrology,
Physical Review Letters 105, 063001 (2010),
http://dx.doi.org/10.1103/PhysRevLett.105.063001
Highlighted in the issue of Phys. Rev. Lett. itself,
and in Physics Synopsys: http://physics.aps.org/synopsis-for/10.1103/PhysRevLett.105.063001,
and Research Highlights: Nature 466, 798 (2010).
http://www.nature.com/nature/journal/v466/n7308/full/466798c.html
A.L. Wolf, S.A. van den Berg, W. Ubachs, K.S.E. Eikema,
Direct Frequency Comb Spectroscopy of Trapped Ions
Physical Review Letters 102, 223901 (2009)
http://dx.doi.org/10.1103/PhysRevLett.102.223901
E.J. Salumbides, D. Bailly, A. Khramov, A.L. Wolf, K.S.E. Eikema, M. Vervloet, W. Ubachs,
Improved laboratory values of the H2 Lyman and Werner lines for constraining time variation of the proton-to-electron mass ratio
Physical Review Letters 101, 223001 (2008)
http://dx.doi.org/10.1103/PhysRevLett.101.223001
Deep ultraviolet quantum-interference metrology with ultrashort laser pulses
S. Witte, R.Th. Zinkstok, W. Ubachs, W. Hogervorst, K.S.E. Eikema
Science 307, 400-403 (2005)
http://www.sciencemag.org/content/307/5708/400
Continuous coherent Lyman-alpha excitation of atomic hydrogen
K.S.E. Eikema, J. W. Walz, T.W. Haensch
Physical Review Letters 86, 5679-5682 (2001)
http://dx.doi.org/10.1103/PhysRevLett.86.5679
Continuous wave coherent Lyman-alpha radiation
K.S.E. Eikema, J. W. Walz, T.W. Haensch
Physical Review Letters 83, 3828-3831 (1999)
http://dx.doi.org/10.1103/PhysRevLett.83.3828
Precision measurements in helium at 58 nm: Ground state Lmb shift and the 1 S-1 2 P-1 transition isotope shift
K.S.E. Eikema, W. Ubachs, W. Vassen, W. Hogervorst
Physical Review Letters 76, 1216-1219 (1996)
http://dx.doi.org/10.1103/PhysRevLett.76.1216
1st laser excitation of the He-4 1(1)S-2(1)P resonance line at 58 nm
K.S.E. Eikema, W. Ubachs, W. Vassen, W. Hogervorst
Physical Review Letters 71, 1690-1692 (1993)
http://dx.doi.org/10.1103/PhysRevLett.71.1690