High Quality Content by WIKIPEDIA articles! A SASER is the acoustic analogue of the laser. It is capable of producing highly coherent, concentrated beams of ultrasound, using methods very similar to those employed in the laser. First experimentally demonstrated in the Gigahertz range in 2009, the SASER is being developed at the University of Nottingham, the Lashkarev Institute of Semiconductor Physics, and Caltech. The University of Nottingham device operates at about 440 GHz, while the Caltech device operates in the megahertz range. In an interview, a member of the Nottingham group, told physicsworld.com that "the two approaches are complementary and it should be possible to use one device or the other to create coherent phonons at any frequency in the megahertz to terahertz range."