A working laser requires both a lasing

A working laser requires both a lasing

A working laser requires both a lasing nikefree amplifies externally-supplied light—and an optical cavity, which bounces the light back and forth through the medium until the desired power is achieved. Existing lasers use media ranging from crystals doped with rare-earth airmax to specific mixtures of gas and even certain sorts of semiconductors. Dr Yun plumped instead for a chemical called Green Flourescent Protein (GFP), the substance responsible for making certain species of jellyfish glow in the dark. The chemical is well-known to biologists, who use its flourescent nike airmax bw track of particular proteins and gene sequences.