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Phase masks have numerous applications in astronomical optics, in particularrelated to two themes: coronography for detection and analysis of extrasolarplanets or circumstellar disks, and wavefront analysis for extremely preciseadaptive optics systems or cophasing of segmented mirrors. I review some of theliterature concerning phase masks and attempt to bridge the gap between twoinstrumental systems in which they are often found: the Mach-Zehnderinterferometer and the coronograph.

Phase masks in astronomy: From the Mach-Zehnder interferometer to Coronographs