Determination of nonlinear refractive index in a Ta2O5 rib waveguide using self-phase modulation.

摘要: 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 one order magnitude. Femtosecond time flight measurements based on Kerr shutter configuration show that the group velocity dispersion small at 800 nm, confirming may neglected in estimation so simplified theory can used with good accuracy.