Bubble laser
Laser made of a bubble / From Wikipedia, the free encyclopedia
An ordinary bubble can serve as an optofluidic laser. These bubble lasers have been made of dye-doped soap solutions and smectic liquid crystal. In a bubble laser, the bubble itself serves as the optical resonator.[1] Uniquely, bubble lasers exhibit hundreds of regularly spaced resonant frequencies called whispering gallery modes, named for the Whispering Gallery in St. Paul's Cathedral in London.[1][2] Researchers have found that the emission spectrum of a bubble laser is highly dependent on the bubble's environment; changing ambient air pressure or electric fields changes the size of the bubble (the optical resonator), and therefore the wavelengths of laser emission.[3]
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