SemiConductor Devices (SDI) is a company engaged in the development and manufacturing of infrared detectors and laser diodes. It offers a range of cooled and uncooled detectors based on a variety of sensing materials such as indium antimonide, mercury cadmium telluride, indium gallium arsenide, type II super lattice, and vanadium oxide. The company serves the defense, home land security, space, and commercial markets.