New determination method of electro-optic constants and relevant nonlinear susceptibilities and its application to doped polymer

Abstract
A new method is proposed for the determination of the electro‐optic constants and relevant nonlinear susceptibilities. It was applied to polycarbonate films doped with 4‐diethylamino‐4’‐nitrostilbene. The real and imaginary parts of the third‐order nonlinear susceptibility X(3) (−ω;ω, 0,0) of the film were determined by the method between 600 and 800 nm at room temperature. X(3) (−ω;ω, 0,0) is (6+4i)×1012 esu or quadratic electro‐optic constant R is (−1−0.7i)×1020 m2/V2 at 597 nm.