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Optimum performance of a laser‐driven cryogenic target requires spherical symmetry and uniformity of the deuterium‐tritium (DT) condensate on the interior surface of the fuel capsule. These characteristics are determined, in general, by interferometry. We have developed a shearing interferometer that is free from spherical and chromatic aberration. The detailed structure of the inteferometer is elucidated, and interferograms with a constant phase background and a tilted fringe background are presented.