Three-Dimensional Electronic Four Wave-Mixing Spectroscopy in GaAs Quantum Wells

Three-dimensional electronic Fourier transform four wave-mixing spectroscopy of GaAs quantum wells is demonstrated for the first time using wave vector beam shaping and femtosecond spatiotemporal pulse shaping to create four fully phase-coherent, non-collinear optical fields. This technique is an optical analogue of multidimensional and multi-quantum NMR. From a study of GaAs quantum wells, an internally calibrated, yet previously unmeasured two-dimensional projection correlating events between the first two time periods is presented.