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This paper presents the results of a Fresnel Interferometric Array testbed.This new concept of imager involves diffraction focussing by a thin foil, inwhich many thousands of punched subapertures form a pattern related to aFresnel zone plate. This kind of array is intended for use in space, as a wayto realizing lightweight large apertures for high angular resolution and highdynamic range observations. The chromaticity due to diffraction focussing iscorrected by a small diffractive achromatizer placed close to the focal planeof the array.  The laboratory test results presented here are obtained with an 8 centimeterside orthogonal array, yielding a 23 meter focal length at 600 nm wavelength.The primary array and the focal optics have been designed and assembled in ourlab. This system forms an achromatic image. Test targets of various shapes,sizes, dynamic ranges and intensities have been imaged. We present the firstimages, the achieved dynamic range, and the angular resolution.

Fresnel interferometric arrays for space-based imaging: testbed results