Go to the homepage of the Vrije Universiteit.Go to the homepage of the department of physics and astronomy.Go to the homepage of the faculty of sciences.

Home page of Kjeld Eikema


Prof. dr. K.S.E. Eikema

Director LaserLaB Amsterdam

Link to my Ultrafast Laser Physics and Precision Metrology Group

Vrije Universiteit
LaserLaB, Faculty of Sciences (FEW)
Atomic, Molecular, and Laser Physics Group
De Boelelaan 1081
1081 HV Amsterdam
The Netherlands

Room: T255
Tel. (31) 20-598 7957 (office) / 5987438 (lab)
Fax (31) 20-598 7992
e-mail: k.s.e.eikema@vu.nl

Links to my research at LaserLaB Vrije Universiteit Amsterdam:

Ultrafast Laser Physics and Precicion Metrology Group home page

Atoms, Molecules and Lasers Group home page

And my research at ARCNL:
EUV Generation and Imaging Group at ARCNL


Research interests:

Precision tests of fundamental physics focusing on QED and nuclear size effects: The Proton Radius Puzzle, using atoms like helium and helium+ ions and H2 molecules. Other interests: testing the stability of fundamental constants (such as alpha using e.g. quasar data), frequency comb lasers, high power (multi-TW) ultrafast lasers and ultrafast phenomena, coherent X-ray generation, laser-produced plasmas, and lensless imaging with light ranging from infrared to soft-X-ray wavelengths.

Have a look at the home page of the Ultrafast Laser Physics and Precision Metrology Group,
and at this link: EUV Generation and Imaging Group at ARCNL, where I work for 30% of my time.

A short CV

2018 - now: Director LaserLaB Amsterdam
2014 - now: Group leader (30% fte) at ARCNL of the EUV Generation and Imaging Group (together with Dr. 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'


Fresnel Prize 2003 (for fundamental aspects) from the European Physical Society

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. You can find a short description at the news section of the department website, and at the section about open PhD and Postdoc positions.
ERC logo
Other personal grants:
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

Other grants obtained in collaborations (incomplete list):

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
2006 FOM Metrology


Full list of publications

Selected high-profile publications:

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)

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)

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)

K.S.E. Eikema,
News and Views: Twisted high-harmonic generation
Nat. Photon. 9, 710-712 (2015)

Front page of Light:Science and applications
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)

Nature Physics January 2014 cover
J. Morgenweg, I. Barmes and K.S.E. Eikema,
Ramsey-comb spectroscopy with intense ultrashort laser pulses
Nature Physics 10, 30-33 (2014)

Also see the News and Views by Scott A. Diddams on page 8-9 of the same issue:

I. Barmes, S. Witte, K.S.E. Eikema
High-precision spectroscopy with counterpropagating femtosecond pulses
Physical Review Letters 111, 023007 (2013)

I. Barmes, S. Witte, K.S.E. Eikema,
Spatial and spectral coherent control with frequency combs
Nature Photonics 7, 38-42 (2013)

Also see the News and Views article by A. M. Weiner on page 6-8 of the same issue:

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)

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)

K.S.E. Eikema,
Frequency Combs liberated from material dispersion
Nature Photonics 5, 258-260 (2011)   (News and Views)

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),

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).

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)

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)

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)

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)

Continuous wave coherent Lyman-alpha radiation
K.S.E. Eikema, J. W. Walz, T.W. Haensch
Physical Review Letters 83, 3828-3831 (1999)

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)

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)