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Long-wave infrared digital holographic interferometry with diffuser or point source illuminations for measuring deformations of aspheric mirrors

par Vandenrijt, Jean-François;Thizy, Cédric;Georges, Marc;Queeckers, Patrick ;Dubois, Frank ;Doyle, Dominic
Référence Optical engineering, 53, 11, 112309
Publication Publié, 2014

Article révisé par les pairs

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Résumé :

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. © 2014 Society of Photo-Optical Instrumentation Engineers.