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An aspherical lens is made by a thin-film coating technique. A special mask is placed between the evaporation source and the substrate that is to be coated as an aspheric. The design principle of the mask is completely described. The final surface is tested by an interferometric double path auto-collimation measuring method. Less than 0.05λ rms of a wave (632.8 nm) of aberrations is achieved without...
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