Abstract

A new method for the determination of spatially resolved phase differences of nonlinear susceptibilities is presented. The technique is based on the interference of the signal field with a reference field. A phase-shifting element that directly changes the phase difference between the two second-harmonic fields is introduced. The reliability of the method is tested by an experiment with two quartz crystals. As a first application, a measurement of the phase difference between domains in antiferromagnetic ${\mathrm{YMnO}}_3$ is presented.

© 1999 Optical Society of America

Frequency-domain interferometric second-harmonic spectroscopy

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