SHG and THG Spectra (IMAGE) National Institutes of Natural Sciences Caption Fig. 1. Spectra of SHG and THG which are emitted by irradiation of 6 fs laser pulses in an organic superconductor, κ-(BEDT-TTF)2Cu[N(CN)2]Br. Observation of the SHG in the centrosymmetric materials indicates a non-linear current which cannot be described by Ohm's law. Right panel shows the crystal structure of the sample. Credit NINS/IMS Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.