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

Abstract

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 one to the order of 100 atoms in the microtrap with sub-poissonian precision.

arXiv comment13 pages, 10 figures

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• Sub-Poissonian atom number fluctuations by three-body loss in mesoscopic ensembles
• Evaporative cooling of a small number of atoms in a single-beam microscopic dipole trap
• Dynamics of two atoms undergoing light-assisted collisions in an optical microtrap
• Counting atoms in a deep optical microtrap
• Sub-Poissonian atom number fluctuations using light-assisted collisions
• Measurement of the atom number distribution in an optical tweezer using single photon counting

Cited by in corpus (6)

• Preparation of ultracold atom clouds at the shot noise level
• Direct Measurements of Collisional Dynamics in Cold Atom Triads
• Sub-atom shot noise Faraday imaging of ultracold atom clouds
• Zeeman-insensitive cooling of a single atom to its two-dimensional motional ground state in tightly focused optical tweezers
• Thermally-robust spin correlations between two 85Rb atoms in an optical microtrap
• Quantifying Light-assisted Collisions in Optical Tweezers Across the Hyperfine Spectrum