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Advances in atomic, molecular, and optical physics

2D Coherent Spectroscopy of Electronic Transitions

Hebin Li, Steven T. Cundiff

Published Jan 1, 2017• 7 citations
Publisher
DOI
10.1016/bs.aamop.2017.03.004

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High Resolution Image Download MS PowerPoint Slide We present measurements of the coherence times of excited states of hydrogen-like arsenic impurities in germanium (Ge:As) using a table-top two-dimensional time-domain spectroscopy (2D-TDS) system. We show that this laboratory system is capable of resolving the coherence lifetimes of atomic-like excited levels of impurity centers in semiconductors, such as those used in solid-state quantum information technologies, on a subpicosecond time scale. By fitting the coherent nonlinear response of the system with the known intracenter transition frequencies, we are able to monitor coherent population transfer and decay of the transitions from the 2p 0 and 2p ± states for different low excitation pulse fields. Furthermore, by examining the off-diagonal resonances in the 2D frequency-domain map, we are able to identify coherences between excited electronic states that are not visible via conventional single-frequency pump–probe or Hahn-echo measurements.