We describe a technique for the rapid determination of the mass of particles confined in a free-space optical dipole force trap without the need for a vacuum environment (Carlse et al., Phys. Rev. Appl. 14, 024017 (2020)). The trapping light is amplitude modulated causing the particle to be released and subsequently recaptured by the optical dipole force. The drop and restore trajectories are directly imaged using a high-speed CMOS sensor to determine the particle mass. These measurements are corroborated using the position autocorrelation function and the mean-square displacement. We also examine the prospect of extending these techniques to particles trapped in liquids.
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