Fischer, RobertNeshev, Dragomir N.Saltiel, Solomon M.Sukhorukov, Andrey A.Krolikowski, WieslawArie, AdyKivshar, Yuri S.2025-12-312025-12-3197808194697240277-786XORCID:/0000-0002-4508-8646/work/162528667ORCID:/0000-0002-3410-812X/work/163397995https://hdl.handle.net/1885/733797469We study the second-harmonic generation via transversely-matched interaction of two counter-propagating ultra-short pulses in Χ(2) photonic structures with either random ferroelectric domains or annular periodic poling. The profile of the transverse second-harmonic signal is given by the cross-correlation of the pulses and can be used to characterise the temporal structure of the pulses.enDisordered nonlinear materialPulse characterisationTransverse second-harmonic generation200810.1117/12.76028041149136319