Carrier-envelope phase- and spectral control of fractional high-harmonic combs

Philipp Raith, Christian Ott, Kristina Meyer, Andreas Kaldun, Martin Laux, Matteo Ceci, Christopher P. Anderson, Thomas Pfeifer

Research output: Contribution to journalArticlepeer-review


We experimentally and numerically control high-harmonic generation (HHG) by time delaying variable segments of a few-cycle driving laser spectrum. In this configuration combs of fractional high harmonics can be produced by interference of two temporally spaced attosecond pulse trains. We explain the observed beating of the high-harmonic intensity with the time delay and study the influence of the spectral segmentation on the high harmonics. By the implementation of additional carrier-envelope phase (CEP) control, we extend the control configuration and demonstrate independent multi-parameter controllability of HHG purely enabled by the CEP and the time delay between two spectral segments. We present how specific properties of the fractional harmonics can be optimized. Analyzing the measured fractional harmonic combs by a spectral interferometry method, we find that the relative phase between the two contributing attosecond pulse trains can be freely set by the CEP of the driving laser field. We also discuss how, in the future, this method can be applied to simultaneously measure transient dispersion and absorption in the extreme ultraviolet spectral region.

Original languageEnglish (US)
Article number173102
JournalJournal of Applied Physics
Issue number17
StatePublished - Nov 7 2013
Externally publishedYes

ASJC Scopus subject areas

  • General Physics and Astronomy


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