SEARCH Articles Figures Tables Nonlinear optical , second Nonlinear optical propertie Nonlinear optical properties Nonlinear properties Nonlinear second order Nonlinear second-order optical nonlinearity Nonlinear second-order properties Optical nonlinearity second-order Order properties Second nonlinear optics Second-order nonlinear optical Second-order nonlinear optical propertie Second-order nonlinear optical propertie Second-order nonlinear optics Second-order properties