Michigan Aerospace has developed and patented a high resolution, compact and rugged piezoelectrically based actuator, known as a force motor, which has become an integral part of our tunable Fabry-Perot Interferometers. These units are capable of operation in high-vacuum cryogenic environments as well as under normal lab conditions. These motors are designed in such a way that they are suitable to be integrated into a design as a structural member of an assembly and are capable of both open and closed loop operation.