Abstract
A large second harmonic generation (SHG) excited by an Nd:YAG laser(λ = 1.32 µm) has been observed during the investigation of the optical poling process in2-(stilbene-4-yl)benzoxazole derivatives chromophores incorporated within oligoetheracrylate photopolymer matrices. We have revealed that the maximum outputSHG is observed for the chromophore derivatives molecule possessing the highestsecond-order hyperpolarizabilities and corresponding dipole moments. Due tothe incorporation of the chromophore into photopolymer matrices, second-ordermicroscopic susceptibilities of the composites substantially increase (from 0.24 up to1.89 pm V−1). The investigated composites possess long-lived polarized states and after more than106 laser pulses the output SHG did not decrease below 75% compared with the initial SHG one. Optimalconditions for optical poling corresponded to a power density of the doubled frequency beam of about0.07 GW cm−2 and chromophore content about 6.5% (in weighting units).
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