4 D Technology Corporation

4D Technology designs and manufactures laser interferometers, surface roughness profilers, and interferometry accessories for accurate measurement of optics, optical systems, and precision machined surfaces. The company pioneered Dynamic Interferometry® technology, which captures all measurement data simultaneously in a short exposure time, enabling accurate measurement even in environments with vibration, air turbulence, or rapid motion. 4D Technology's instruments are used in aerospace, defense, astronomy, semiconductor, automotive, and biomedical manufacturing. The company developed specialized measurement instruments for the James Webb Space Telescope. Founded in 2002 in Tucson, Arizona, 4D Technology was acquired by Nanometrics in 2018 and operates as a wholly owned subsidiary of Onto Innovation Inc.