A computer-generated hologram(CGH) was designed and produced for precisely testing the off-axis aspheric mirror with departure of 1200um in a three mirror astigmatism optical system.To solve the problem of selection of incident light position in CGH design Depended on engineering experience was likely to increase spatial frequency of CGH which reduced testing accuracy of aspheric mirror. A CGH design method was proposed based on quantitative calculation of incident light position which reduced the reliance on experience. The testing result by CGH was compared with that of non-contact profile testing method when the off-axis aspheric mirror surface was polished to 0.05λ(RMS).Two testing results show a good agreement. By CGH testing method,the surface error is 0.016λ RMS now.
Diffractive optical system can be a favorable choice for large-aperture space telescope to reduce the mass and size of image system. To meet the demand of large-aperture, high efficiency, lightweight diffractive optic for high resolution remote sensing, a 200 mm diameter, 20 μmthick, 4-level diffractive membrane fabricated is shown to have over 62% diffraction efficiency into the +1 order, with 0.051 efficiency RMS. Over 66% diffraction efficiency is achieved for a 100 mm aperture membrane, with 0.023 efficiency RMS. The membrane thickness uniformity control is discussed and 8 nm wave front error RMS is achieved in 100 mm diameter.
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