An optical interferometer that uses a beam splitter to split a light source into two arms, each of which is reflected back toward the beam splitter which then combines their amplitudes using the superposition principle. The resulting interference pattern is typically directed to a photoelectric detector or camera.

Array measuring astronomical signals collaboratively.

The shearing interferometer is an extremely simple means to observe interference and to use this phenomenon to test the collimation of light beams, especially from laser sources which have a coherence length which is usually significantly longer than the thickness of the shear plate (see graphics) so that the basic condition for interference is fulfilled.

A Fizeau interferometerLawson, Peter R. "Principles of Long Baseline Stellar Interferometry."

An intensity interferometer is the name given to devices that use the Hanbury Brown and Twiss effect.

An atom interferometer uses the wave-like nature of atoms in order to produce interference.