The nonlinear refractive index, <i>n</i><sub>2</sub> , 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 <i>n</i><sub>2</sub> decreases monotonically from ~3.3×10<sup>-16</sup> to ~2.8×10<sup>-16</sup> cm <sup>2</sup>/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
Arkady Major, Fumiyo Yoshino, Irkalis Nikolakakos, J. Stewart Aitchison, and Peter W. E. Smith, "Dispersion of the nonlinear refractive index in sapphire," Opt. Lett. 29, 602-604 (2004)