Heated prisms deflect beam with no moving parts
Useful for optical switching and other applications, beam deflectors of nonmechanical design can be simpler and more reliable than their counterparts that rely on mechanical motions. Researchers at Radiant Research Inc. and The University of Texas at Austin (both in Austin, Texas) have developed an alternative that relies on the thermo-optic effect, in which a temperature change alters the refractive index.