[en] Long-wave infrared digital holographic interferometry with CO2 laser and microbolometer arrays has been developed for testing the large deformations of space reflectors. The setup considered is a Mach–Zehnder, associated to the digital holography reconstruction of the wavefront in the inline configuration with phase shifting.
Two possibilities exist for illuminating the tested reflector: either with a point source (similarly to classical interferometry) or an extended source (with a diffuser). This paper presents the development of a modular setup which allows comparing both in the case of a parabolic mirror
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Georges, M. P., Vandenrijt, J.-F., Thizy, C., Stockman, Y., Queeckers, P., Dubois, F., Doyle, D., "Digital holographic interferometry with CO2 lasers applied to aspheric space reflectors testing, " in Digital Holography and Three-Dimensional Imaging, OSA Technical Digest (online) (Optical Society of America), DW3A. 4 (2013)