Complete Pockels tensor component analysis of ferroelectric copolymers of vinylidene fluoride and trifluoroethylene

Single crystalline films (SCF) of ferroelectric poly(vinylidene fluoride/tetrafluoroethylene) copolymer with molar ratio of 71/29 were prepared and their Pockels tensor components were investigated. A measuring system was developed in which a laser beam is introduced onto a sample and the refractive index and Pockels effects are measured from the reflected beam and birefringence, and the transmitted beams, respectively. Using this system, the equation of the indicatrix of the films was accurately determined and all Pockels tensor components were measured at room temperature at constant stress.