The Center for Freeform Optics
An Industry/University Cooperative Research Center

Interferometric measurement of a concave, φ-polynomial, Zernike mirror

Kyle Fuerschbach, Kevin P. Thompson, and Jannick P. Rolland

in Optics Letters

We report on the surface figure measurement of a freeform, 𝜑φ-polynomial (Zernike) mirror for use in an off-axis, reflective imaging system. The measurement utilizes an interferometric null configuration that is a combination of subsystems each addressing a specific aberration type, namely, spherical aberration, astigmatism, and coma.