Tai, Chao-Yi, Wilkinson, James S., Perney, Nicholas M.B., Netti, M.C., Cattaneo, F., Finlayson, Chris and Baumberg, Jeremy
Determination of nonlinear refractive index in a Ta2O5 rib waveguide using self-phase modulation
Optics Express, 12, (21), . (doi:10.1364/OPEX.12.005110).
Self-phase modulation has been observed for ultrashort pulses of wavelength 800nm propagating through a 1 cm-long Ta2O5 rib waveguide. The associated nonlinear refractive index n2 was estimated to be 7.23×10-19 m2/W, which is higher than silica glass by more than one order of magnitude. Femtosecond time of flight measurements based on a Kerr shutter configuration show that the group velocity dispersion is small at a wavelength of 800 nm, confirming that dispersion may be neglected in the estimation of n2 so that a simplified theory can be used with good accuracy.
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