Ultimate Limit in the Spectral Resolution of Extreme Ultraviolet Frequency Combs
C. Corsi ; I. Liontos ; M. Bellini ; M. Siciliani de Cumis ; et al. ;
Apr - 2017
DOI: 10.1103/PhysRevLett.118.143201

journal : Physical Review Letters

Volume : 118 ; Issue : 14
type: Article Journal

We present the results of direct interferometric measurements on the pulse-to-pulse phase jitter of a metrological, fiber-based, infrared (IR) frequency comb. We show that the short-time evolution of such phase fluctuations, which cannot be actively controlled by any feedback system, imposes a stringent limit on the tooth linewidth of extreme ultraviolet (XUV) combs produced by high-order harmonic conversion, thus explaining the difference of 9 orders of magnitude between the coherence times of state-of-the-art IR and XUV frequency combs.

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