| Abstract
| - A water droplet, which was formed as a nucleation center from an aerosol of ammonium chloride, was trappedby a converged c.w. IR laser (λ = 1064 nm) using a 100× objective lens, and the successive growth of thedroplet was observed under supersaturated water vapor. The size of the droplet increased linearly with timeand its maximum radius was 5.7 μm at a laser at 5 mW, indicating that the axial trapping efficiency Q was0.46. This efficiency is much greater than those reported previously; for example, according to Ashkin andDziedzic [Science1975, 187, 1073], Q = 0.08 for a glycerol droplet of radius 6 μm at 40 mW (λ = 514.5nm).
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