Laser Made of Sound

           50 years since the first laser was demonstrated, physicists have decided to build devices capable of controlling sound waves in the same way that optical lasers change light. This year, two teams of researchers said that they development working sound based lasers or “sasers.” Optical lasers use quantum effects to produce a beam of one color. The big challenge in converting the laser to sound has been finding a way to make just one sonic frequency. Physicist Tony Kent and his classmates at the University of Nottingham in England made an amplifier that might fix this problem they are having.  The resulting saser can build up a sound wave at a specific frequency in the range that they need. This sound wave is far above the human hearing.