Spectral broadening of femtosecond pulses in polycrystalline anatase titanium dioxide waveguides

We observe the first nonlinear spectral broadening of femtosecond pulses in single-mode anatase TiO2 waveguides at 793 and 1565 nm. The broad applicability and low two-photon absorption of TiO2 makes it a promising material for integrated photonics.