Highest Quality Laser Interferometer Measurements Require Highest Quality Reference Optics

Fizeau interferometers are used to measure the shape and quality of optical surfaces with high precision by comparing the optic under test to a reference optic. However, it is important to remember that not all reference optics are created equal, as design and construction may cause quality fluctuation. When using reference optics to assess the quality of other optical surfaces, it is essential to have confidence in the quality and precision of the reference optics.