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Creators/Authors contains: "Zhu, Yifu"

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  1. ; ; ; ; (, Optics Letters)
    We report an experimental demonstration of optical two-dimensional coherent spectroscopy (2DCS) in cold atoms. The experiment integrates a collinear 2DCS setup with a magneto-optical trap (MOT), in which cold rubidium (Rb) atoms are prepared at a temperature of approximately 200 µK and a number density of 1010cm−3. With a sequence of femtosecond laser pulses, we first obtain one-dimensional second- and fourth-order nonlinear signals and then acquire both one-quantum and zero-quantum 2D spectra of cold Rb atoms. The capability of performing optical 2DCS in cold atoms is an important step toward optical 2DCS study of many-body physics in cold atoms and ultimately in atom arrays and trapped ions. Optical 2DCS in cold atoms/molecules can also be a new avenue to probe chemical reaction dynamics in cold molecules. 
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  2. ; ; (, Physical Review Letters)
    Full Text Available 
  3. ; ; ; ; (, Conference on Lasers and Electro-Optics, OSA Technical Digest (Optical Society of America, 2019))
    We report the first observation of two-, three-, four-, five-, six-, and seven-atom Dicke states in an atomic vapor using optical multi-quantum 2D coherent spectroscopy. This has significant implications in the studies of many-body physics. 
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  4. ; ; ; ; (, Optics Express)
  5. ; ; ; ; (, Optics Letters)