Abstract

The nonlinear refractive index, $n_2$, of sapphire was experimentally measured in the 550–1550-nm wavelength range by use of a picosecond $Z$-scan technique. It was found that in this spectral region the value of $n_2$ decreases monotonically from $\sim 3.3\times {10}^{-16}$ to $\sim 2.8\times {10}^{-16} {\mathrm{cm}}^2/\mathrm{W}$. An empirical expression for the wavelength dependence of the nonlinear refractive index in the 270–1550-nm range was obtained.

© 2004 Optical Society of America

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