FIELD: astrophysical instruments.
SUBSTANCE: invention relates to the finishing and control of large-sized axial and off-axis mirrors of telescopes. In the process of interferometric control of the shape of an aspherical mirror using an interferometer and a wavefront corrector in the form of a combined diffraction optical element (DOE), including the main diffraction structure and two additional ring centering and focusing structures, the position of the luminous spot from the focusing structure at the top of the aspherical surface is combined with its geometric center, the decentering coma aberration is determined, which is taken into account and eliminated during subsequent refinement of the shape to the required design.
EFFECT: increase in the accuracy of decentering measurements.
1 cl, 8 dwg
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