Fischer, RobertSaltiel, Solomon M.Sukhorukov, AndreyKrolikowski, WieslawKivshar, YuriNeshev, Dragomir2015-12-162015-12-160003-6951http://hdl.handle.net/1885/95050The authors study experimentally the transverse second-harmonic generation of counterpropagating pulses by a quasi-phase-matching in a medium with a random ferroelectric domain structure. The authors show that this parametric process results in a direct realization of the cross correlation of two optical signals and, therefore, it can be employed for direct characterizations of ultrashort pulses including their temporal structure and pulse front tilt.The authors acknowledge the support of the Australian Research Council.http://www.sherpa.ac.uk/romeo/issn/0003-6951..."Publishers version/PDF may be used on author's personal website, institutional website or institutional repository" from SHERPA/RoMEO site (as at 16/12/15). Copyright 2007 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied Physics Letters and may be found at https://doi.org/10.1063/1.2751583Keywords: Ferroelectric materials; Optical correlation; Optical signal processing; Parameter estimation; Ultrashort pulses; Counterpropagating pulses; Ferroelectric domain structure; Temporal structure; Harmonic generation2007-07-1910.1063/1.27515832016-02-24