AXT, Inc., together with its subsidiaries, designs, develops, manufactures, and distributes compound and single element semiconductor substrates for use in wireless communications, lighting display applications, and fiber optic communications. It offers semi-insulating gallium arsenide substrates, which are used for applications in power amplifiers and radio frequency integrated circuits for wireless handsets; direct broadcast televisions; high-performance transistors; and satellite communications. The company also offers semi-conducting gallium arsenide substrates, which are used for applications in light emitting diodes, lasers, and optical couplers; substrates made from indium phosphide that are used in broadband and fiber optic communications; and substrates made from germanium, which are used in satellite and terrestrial solar cells, and optical applications. AXT, Inc. manufactures its semiconductor substrates using its proprietary vertical gradient freeze technology. In addition, the company, through its joint ventures, manufactures and sells gallium, arsenic, germanium, germanium dioxide, paralytic boron nitride crucibles, and boron oxide. It sells its products through direct sales force in the United States, as well as through independent sales representatives in France, Germany, Japan, South Korea, Taiwan, and the United Kingdom. The company was formerly known as American Xtal Technology, Inc. and changed its name to AXT, Inc. in July 2000. AXT, Inc. was founded in 1986 and is headquartered in Fremont, California.