Most widespread interferometer, Fizeau enables measurements of flat and spherical surfaces using non contact configuration. Its reference and measurement optical paths are the same, making this a compact, vibration-resistant system. Fizeau interferometer is in a way similar to a Fabry-Perot interferometer as both consist of two reflecting surfaces. In a Fizeau interferometer, however, the second surface is usually totally reflecting. An angled beam splitter captures the reference and measurement beams.

The Fizeau is one of the simplest and most versatile interferometers and is popular for routine measurement of both flat and spherical surfaces.

DPSS laser is used as the light source. Optical layout is arranged in vertical direction to make the placement of test components easy. The fringes are captured by CCD camera and analyzed by a computer.

This equipment gives students exposure to the use of Fizeau interferometer in optics manufacturing and quality control.