Open AccessInterlocked attosecond pulse trains in slightly bi-elliptical high harmonic generation
Author(s) -
Eliyahu Bordo,
Ofer Kfir,
Sergey Zayko,
Ofer Neufeld,
Avner Fleischer,
Claus Ropers,
Oren Cohen
Publication year - 2020
Publication title -
jphys photonics
Language(s) - English
Resource type - Journals
ISSN - 2515-7647
DOI - 10.1088/2515-7647/ab8a5c
Subject(s) - harmonics , ultrashort pulse , attosecond , physics , high harmonic generation , harmonic , optics , omega , laser , acoustics , quantum mechanics , voltage
The ellipticity of high harmonics driven by bi-chromatic (e.g. ω − 2 ω ) 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.