Scientists create continuously emitting microlasers with nanoparticle-coated beads: Right mix of nanocrystals and light activates unique laser properties in 5-micron spheres

Researchers have found a way to convert nanoparticle-coated microscopic beads into lasers smaller than red blood cells. These microlasers, which convert infrared light into light at higher frequencies, are among the smallest continuously emitting lasers of their kind ever reported and can constantly and stably emit light for hours at a time, even when submerged in biological fluids such as blood serum.