AXT, Inc. researches, develops, and produces compound and single element semiconductor substrates. It produces semiconductor substrates using its proprietary vertical gradient freeze technology. The company offers indium phosphide (InP) for use in fiber optic lasers and detectors, passive optical networks, data center connectivity, silicon photonics, photonic integrated circuits, terrestrial solar cells, radio frequency amplifier and switching, infrared light-emitting diode (LEDs) motion control, and infrared thermal imaging. It also provides semi-insulating gallium arsenide (GaAs) substrates for applications in power amplifiers, direct broadcast television, transistors, satellite communications, and solar cells; and semi-conducting GaAs substrates that are used in 3-D sensing, data center communication, high brightness LEDs, lasers, near-infrared sensors, printer head lasers and LEDs, optical couplers, solar cells, and night vision goggles, as well as laser machining, cutting, and dri