Achromatic nulling interferometer based on a geometric spin-redirection phase

Nulling interferometry aims to perform destructive interference achromatically. It is used to detect a faint source near a bright one and to provide dark field, an annular pupil, and rotational shear. A nulling out-of-plane interferometer that utilizes the geometric phase of spin redirection is proposed. The degree of nulling is determined by beam collimation and angular orientation of mirrors. Simulations and experiments are in reasonable agreement.