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Showing 1–7 of 7 results
Advanced filters: Author: Kjeld S. E. Eikema Clear advanced filters

  • A spheroidal shape of microresonator avoids the traditional wavelength limitations imposed by the resonator material in the generation of microresonator-based optical frequency combs.

    • Kjeld S. E. Eikema
    News & Views
    Nature Photonics
    Volume: 5, P: 258-260

  • Pauli exclusion principle has fundamental and practical consequences to the structure of matter and particle interaction. Here the authors demonstrate Pauli blocking in a coherently driven system using trapped 3He degenerate Fermi gases.

    • Raphael Jannin
    • Yuri van der Werf
    • Kjeld S. E. Eikema
    ResearchOpen Access
    Nature Communications
    Volume: 13, P: 1-7

  • Crossing two focused laser beams with opposite circular polarization makes the production and application of circularly polarized light in the extreme ultraviolet and soft X-ray spectral regions considerably easier and more efficient.

    • Kjeld S. E. Eikema
    News & Views
    Nature Photonics
    Volume: 9, P: 710-712

  • Coherent control is a powerful tool for controlling light–matter interactions in time and frequency. Now, scientists show that counter-propagating broadband pulses can be used to generate fully controlled spatial excitation patterns. This spatial control approach also reduces decoherence, providing a high-frequency resolution similar to that of an optical frequency comb.

    • Itan Barmes
    • Stefan Witte
    • Kjeld S. E. Eikema
    Research
    Nature Photonics
    Volume: 7, P: 38-42

  • Frequency combs provide a broad series of well-calibrated spectral lines for highly precise metrology and spectroscopy, but this usually involves a trade-off between power and accuracy. A comb created by adjusting the time delay between two optical pulses now enables both. This so-called Ramsey comb could probe fundamental problems such as determining the size of the proton.

    • Jonas Morgenweg
    • Itan Barmes
    • Kjeld S. E. Eikema
    Research
    Nature Physics
    Volume: 10, P: 30-33

  • A measurement of the 1S-2S transition frequency in He+ would enable fundamental physics tests, but the required extreme ultraviolet radiation makes this a challenge. The authors observe such transition using radiation produced by high-harmonic generation of frequency comb pulses, in a manner that is compatible with future precision spectroscopy.

    • Elmer L. Gründeman
    • Vincent Barbé
    • Kjeld S. E. Eikema
    ResearchOpen Access
    Communications Physics
    Volume: 7, P: 1-6