Abstract
Non-linear optical (NLO) properties of thin films of two methacrylic homopolymers and a copolymer with cyano azobenzene chromophores in the side chain have been studied by second harmonic generation (SHG) measurements. The intensity of the harmonic signal from in-situ Corona poled polymeric films has been measured at different temperatures. The effect of 488 nm light irradiation on the azo chromophores orientation and consequently on the non-linear response of the films was investigated at several temperatures. The intensity and thermal stability of the remaining second harmonic signals obtained after the two different (thermal and photoassisted) Corona poling processes have been compared. The second order non linear coefficients have been obtained by the Maker fringes method.
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