The technique of femtosecond four-wave mixing is described, including spectrally-resolved and time-resolved configurations. We illustrate the utility of this technique for the investigation of crucial physical properties in the III-V diluted magnetic semiconductors, afforded by its nonlinearity and high temporal resolution.
Webber, D., de Boer, T., Yildirim, M., March, S., Mathew, R., Gamouras, A., Liu, X., Dobrowolska, M., Furdyna, J., Hall, K. Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing. J. Vis. Exp. (82), e51094, doi:10.3791/51094 (2013).