Abstract
After the discovery of the high temperature superconductivity, anomalous behaviors of conductivity and / or magnetic properties in transition-metal oxides have attracted much interest. Recently we found strong ultrafast optical nonlinearity in a one-dimensional cuprate. To elucidate relationship between the strong nonlinearity and large electron correlation or low-dimensionality of this material, we performed femtosecond pump-probe spectroscopy. We also discuss the applicability to ultrafast optoelectronics.
