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A 4.7 μm diameter microsphere trapped inside a vacuum chamber by a counter-propagating dual-beam optical tweezer. The wavelength of the trapping beams is 1064 nm; A weak green (532 nm) laser is used for illumination. Inset is a counter-propagating dual-beam optical trap in air based on radiative pressure forces. With kind permission from Springer Science and Business Media [9].
