Tatyana A. Vakhonina

The effect of chromophores concentration on the nonlinear optical activity of methacrylic copolymers with azochromophores in the side chain

Quadratic nonlinear-optical characteristics of thin films based on methacrylic copolymers with of chromophore-containing monomers incorporated at various concentrations are measured by Second Harmonic Generation technique. Optimal chromophores content is obtained to be about 17 mol%, rather high values of nonlinear-optical coefficient, d33, up to 60 pm/V, are determined.

Application of Jamin interferometer for the determination of thin transparent polymer films thickness in the visible range

Modification of the technique for thickness determination of thin polymer films that are transparent in the visible range with the application of Jamin interferometer is suggested. The films are deposited on glass substrate. The technique is based on measuring the relative shift of interference fringes. The distinguishing feature of the approach is the use of three beams, one of which participates in the formation of the reference signal; the interference-fringe shift is estimated by the analysis of brightness curves.