Abstract

We experimentally show the spectrally averaged nonlinear refractive index and absorption coefficient for liquid water, water vapor, $ \alpha $-pinene, and Si using a full-phase analysis in the terahertz regime through a standard time-domain spectrometer. Our results confirm that the nonlinear index of refraction of the liquid samples in this regime exceeds the near-infrared optical nonlinear index by six orders of magnitude. In the case of liquid water and water vapor at atmospheric pressure, we find a nonlinear index of ${7.8} \times {{10}^{- 10}}\;{{\rm cm}^2}/{\rm W}$ and ${6} \times {{10}^{- 11}}\;{{\rm cm}^2}/{\rm W}$, respectively, which are both much larger than expected.

© 2020 Optical Society of America

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