Interlocked attosecond pulse trains in slightly bi-elliptical high harmonic generation

Eliyahu Bordo, Ofer Kfir, Sergey Zayko, Ofer Neufeld, Avner Fleischer, Claus Ropers, Oren Cohen

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9 Scopus citations


The ellipticity of high harmonics driven by bi-chromatic (e.g. ω − 2ω) co-propagating fields can be fully tuned by varying the polarization of the pump components. In order to start revealing the underlying mechanism of this control, we explore a relatively simple regime of this scheme that still gives rise to full control over the harmonics ellipticities. In this regime, the pumps are only slightly elliptical and the high harmonic radiation consists of two (different) interlocked attosecond pulse trains (APTs). We formulate a semi-analytic model that maps the high harmonic ellipticity to properties of the APTs harmonic decompositions. Utilizing this model, we reconstruct these APTs variables from measurements of the high harmonics ellipticities. This ellipticity-resolved spectroscopy of interlocked APTs may be useful for ultrafast probing of chiral degrees of freedom.

Original languageEnglish
Article number034005
JournalJPhys Photonics
Issue number3
StatePublished - 27 May 2020


FundersFunder number
Wolfson Foundation
Israel Academy of Sciences and Humanities
Israel Science Foundation1781/18


    • Attosecond pulse trains
    • Bi-elliptical high harmonic generation
    • Ellipticity-resolved spectroscopy


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