Yellas, Z.Z.YellasLee, M.W.M.W.LeeKremer, R.R.KremerChang, K.-H.K.-H.ChangBeghoul, M.R.M.R.BeghoulLUNG-HAN PENGBoudrioua, A.A.Boudrioua2020-06-112020-06-11201710944087https://scholars.lib.ntu.edu.tw/handle/123456789/499515https://www.scopus.com/inward/record.uri?eid=2-s2.0-85035762373&doi=10.1364%2fOE.25.030253&partnerID=40&md5=fdb957dae64051a51bb637c77d75b326We have demonstrated multi-wavelength generation in a nonlinear photonic crystals of lithium tantalate. The optical parametric generation leads to second harmonic generation, sum-frequency generation and other frequency conversion in a cascade process. These conversions are assisted by all the optical nonlinear process involving χ(2) and achieved by satisfying the quasi-phase matching conditions. © 2017 Optical Society of America.[SDGs]SDG7Optical frequency conversion; Phase matching; Photonic crystals; Lithium tantalate; Multiwavelength generation; Nonlinear optical process; Nonlinear photonic crystals; Optical nonlinear; Optical parametric generation; Quasi phase matching; Sum frequency generation; Nonlinear opticsjournal article10.1364/OE.25.030253292210562-s2.0-85035762373