Automated polarization-dependent multidimensional coherent spectroscopy phased using transient absorption
Jared K. Wahlstrand, Galahad M. Wernsing, Jagannath Paul, Alan D. Bristow
An experimental apparatus is described for multidimensional optical spectroscopy with fully automated polarization control, based on liquid crystal variable retarders. Polarization dependence of rephasing two-dimensional coherent spectra for a model optical system are measured in a single scan, with absolute phasing performed for all polarization configurations through a single (automated) auxiliary measurement. A factor of three improvement in acquisition time is demonstrated, compared to the apparatus without automated polarization control. Results are presented for a GaAs quantum well sample and an InGaAs quantum well embedded in a microcavity.