Open AccessUltrafast intermodal third harmonic generation in a liquid core step-index fiber filled with C2Cl4
Author(s) -
Kay Schaarschmidt,
Jens Kobelke,
Stefan Nolte,
Tobias Meyer,
Markus A. Schmidt
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.399771
Subject(s) - ultrashort pulse , optics , materials science , harmonic , context (archaeology) , second harmonic generation , nonlinear optics , wavelength , pulse shaping , fiber , physics , laser , acoustics , paleontology , composite material , biology
Third harmonic generation in a circular liquid core step-index fiber filled with a highly transparent inorganic solvent is demonstrated experimentally using ultrafast pump pulses of different durations in the telecom domain for the first time. Specifically we achieve intermodal phase matching to the HE 13 higher order mode at the harmonic wavelength and found clear indications of a non-instantaneous molecular contribution to the total nonlinearity in the spectral broadening of the pump. Spectral power evolution and efficiency of the conversion process is studied for all pulse parameters, while we found the greatest photon yield for the longest pulses as well as an unexpected blue-shift of the third harmonic wavelength with increasing pump power. Our results provide the basis for future studies aiming at using this tunable fiber platform with a sophisticated nonlinear response in the context of harmonic generation.