Tai Chao-Yi, Wilkinson James, Perney Nicolas, Netti M, Cattaneo F, Finlayson Chris, Baumberg Jeremy
Opt Express. 2004 Oct 18;12(21):5110-6. 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 7.23x10-19 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.
在波长800nm的超短脉冲通过1厘米长的Ta2O5肋形波导传播时，观察到了自相位调制现象。相关的非线性折射率n2估计为7.23×10-19 m2/W，比石英玻璃高一个多数量级。基于克尔快门配置的飞秒飞行时间测量表明，在800nm波长处群速度色散很小，这证实了在估计n2时可以忽略色散，从而可以使用简化理论并获得良好的精度。
