Open AccessPulse characterization by THG d-scan in absorbing nonlinear media
Author(s) -
Mathias Hoffmann,
Tamás Nagy,
Thomas Willemsen,
Marco Jupé,
Detlev Ristau,
Uwe Morgner
Publication year - 2013
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.22.005234
Subject(s) - optics , materials science , pulse (music) , z scan technique , wavelength , absorption (acoustics) , dispersion (optics) , pulse shaping , thin film , characterization (materials science) , nonlinear optics , nonlinear system , second harmonic generation , optoelectronics , laser , physics , nanotechnology , quantum mechanics , detector
We report on few-cycle pulse characterization based on third harmonic generation dispersion scan (THG d-scan) measurements using thin films of different TiO(2)-SiO(2) compositions as nonlinear media. By changing the TiO(2) concentration in the thin film the band gap and therefore the position of the absorption edge were varied. The retrieved pulse durations from different nonlinear media agree within 5%, and the reconstructed pulse shapes prove to be immune against the absorption edges as well. The reason is the robust retrieval algorithm which takes the influence of wavelength dependent nonlinearity into account by a spectral weight function.