Kalinowski, KsaweryKong, QianRoppo, VitoArie, AdySheng, YanKrolikowski, Wieslaw2015-12-112015-12-110003-6951http://hdl.handle.net/1885/70368We study experimentally the Čerenkov second-harmonic generation in an optical superlattice formed in periodically poled lithium niobate crystal. We demonstrate strong sensitivity of the Čerenkov signal to the wavelength, diameter, and position of the incident fundamental beam. We model the observed behavior by using simple approach based on multiple interference of second harmonic signals emitted from the vicinity of the domain walls.The authors acknowledge financial support from 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 11/12/15). Copyright 2011 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/10.1063/1.3659493Keywords: Multiple interferences; Optical superlattice; Periodically poled lithium niobate crystals; Second harmonic signals; Simple approach; Domain walls; Harmonic analysis; Lithium; Niobium compounds; Superlattices; Harmonic generation2011-11-0410.1063/1.36594932016-02-24