Extreme ultraviolet frequency comb metrology

Abstract

The remarkable precision of frequency comb (FC) lasers is transferred to the extreme ultraviolet (XUV, wavelengths shorter than 100 nm), a frequency region previously not accessable to these devices. A frequency comb at XUV wavelengths near 51 nm is generated by amplification and coherent upconversion of a pair of pulses originating from a near-infrared femtosecond FC laser. The phase coherence of the source in the XUV is demonstrated using Helium atoms as a ruler and phase detector. Signals in the form of stable Ramsey-like fringes with high contrast are observed when the FC laser is scanned over P states of Helium, from which the absolute transition frequency in the XUV can be extracted. This procedure yields a 4He ionization energy at h 5945204212(6) MHz, improved by nearly an order of magnitude in accuracy, thus challenging QED calculations of this two-electron system.

4 pages, 3 figures, acknowledgements added, fixed typos

References in corpus (5)

• A High Phase-Space-Density Gas of Polar Molecules
• New Limits to the Drift of Fundamental Constants from Laboratory Measurements
• VUV frequency combs from below-threshold harmonics
• Theoretical energies of low-lying states of light helium-like ions
• Direct frequency comb measurements of absolute optical frequencies and population transfer dynamics

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