Conventional nonlinear Raman–Nath diffraction(NRND)spots exhibit a straight-line distribution when the pump laser enters the nonlinear dielectric grating at normal incidence or at oblique incidence.Here,we report on ...Conventional nonlinear Raman–Nath diffraction(NRND)spots exhibit a straight-line distribution when the pump laser enters the nonlinear dielectric grating at normal incidence or at oblique incidence.Here,we report on the first observation of the conical NRND phenomenon from a submicron-thick periodically poled lithium niobate thin film(PPLNTF)sample under a near-infrared femtosecond pulse laser excitation at various cone angles.All the multi-order second harmonic generation(SHG)diffraction signals present a novel evolution arc-shaped arrangement feature.展开更多
基金Science and Technology Project of Guangdong(2020B010190001)National Natural Science Foundation of China(12434016,11974119)+1 种基金Guangzhou Science and Technology Plan Project(2023A04J1309)National Funded Postdoctoral Researcher Program(GZB20240785)。
文摘Conventional nonlinear Raman–Nath diffraction(NRND)spots exhibit a straight-line distribution when the pump laser enters the nonlinear dielectric grating at normal incidence or at oblique incidence.Here,we report on the first observation of the conical NRND phenomenon from a submicron-thick periodically poled lithium niobate thin film(PPLNTF)sample under a near-infrared femtosecond pulse laser excitation at various cone angles.All the multi-order second harmonic generation(SHG)diffraction signals present a novel evolution arc-shaped arrangement feature.
