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In-trap fluorescence detection of atoms in a microscopic dipole trap

Physical Review A, American Physical Society (APS), ISSN 2469-9926

Volume 91, 5, 2015

DOI:10.1103/physreva.91.053414, Dimensions: pub.1060513460,



  1. (1) Aarhus University, grid.7048.b, AU
  2. (2) University of Otago, grid.29980.3a
  3. (3) Spanish Center for Pulsed Lasers, grid.494576.d


We investigate fluorescence detection using a standing wave of blue-detuned light of one or more atoms held in a deep, microscopic dipole trap. The blue-detuned standing wave realizes a Sisyphus laser cooling mechanism so that an atom can scatter many photons while remaining trapped. When imaging more than one atom, the blue detuning limits loss due to inelastic light-assisted collisions. Using this standing-wave probe beam, we demonstrate that we can count from 1 to the order of 100 atoms in the microtrap with sub-Poissonian precision.


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