We describe a sensitive and simple single-beam technique to measure
simultaneously the real and the imaginary contributions to the complex optical
nonlinearity (the nonlinear refraction and absorption). We call this technique
antiresonant ring interferometric nonlinear spectroscopy (ARINS). An
antiresonant ring interferometer, which has improved stability, is used to
detect very small changes in the phase and the amplitude of an optical beam.
This allows very low intensities to be used and eliminates many interfering
processes present in other techniques that require higher intensities. We
demonstrate ARINS by measuring the optical nonlinearities of bulk ZnS, KDP, and
C70 thin films.
© 1994 Optical Society of America
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