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(a) Geometric configuration of counterpropagating laser beams. (b) Schematic of the experimental apparatus.
(a) Image of a single water droplet in the trap and its Mie scattering fringe. (b) Top view of a single ice crystal with vertical prism faces. Beam spots on the chamber wall are marked with open circles. The deflected beams are partly blocked by the lens holders. (c) Top view of a single ice crystal with vertical prism faces slightly rotated from the symmetric orientation. Interference fringes are marked with open circles. (d) Top view of a single ice plate with vertical basal faces. Strong scattering of the laser light makes each particle visible to the naked eye.
Histogram of the trap time for (a) water droplets and (b) ice crystals.
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