Harmonic Bridge for Measurement of Nonlinear Electric and Electrooptic Properties of Crystals

Publisher Website
Google Scholar
Abstract
A harmonic bridge circuit has been developed for measuring linear and nonlinear electric coefficients and quadratic electrooptic coefficients in high dielectric perovskite crystals. Third and fifth harmonic components are added to the fundamental audio‐frequency driving voltage. The bridge is balanced when the charge or displacement of the crystal is sinusoidal. The harmonic content of the driving voltage may then be measured on a harmonic analyzer, from which measurements the electric coefficients of the crystal may be calculated. The same sinusoidal displacement may be used to display the electrically induced phase retardation intensity pattern on the oscilloscope. The effective electrooptic coefficients are readily determined from the oscillographs. The advantages of the harmonic bridge method are illustrated by measurements of the electric and electrooptic coefficients of a crystal of potassium tantalate niobate (KTN).
Keywords

This publication has 5 references indexed in Scilit: