XUV frequency comb metrology on the ground state of helium

D.Z. Kandula, C. Gohle, T.J. Pinkert, W.M.G. Ubachs, K.S.E. Eikema

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The operation of a frequency comb at extreme ultraviolet (xuv) wavelengths based on pairwise amplification and nonlinear upconversion to the 15th harmonic of pulses from a frequency-comb laser in the near-infrared range is reported. It is experimentally demonstrated that the resulting spectrum at 51 nm is fully phase coherent and can be applied to precision metrology. The pulses are used in a scheme of direct-frequency-comb excitation of helium atoms from the ground state to the 1s4p and 1s5p
Original languageEnglish
Article number062512
JournalPhysical Review A. Atomic, Molecular and Optical Physics
Issue number6
Publication statusPublished - 2011


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