We suggest a novel monolithic design for metal mirror mounting to reduce the surface deformation by the assembly stress. The mirror has a duplex layer to suppress the stress transport and a triangle ear structure for assembly. The reflective surface is on a front layer and a back layer consists of the triangle ears. We perform the structural analysis and manufacture the mirrors and measure the z-sag via UA3P to verify the effectiveness of the design. Comparing the two results, we find out that the design can reduce surface deformation by external stress as we expect.
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