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15 October 2013 Off-axis mirror fabrication from spherical surfaces under mechanical stress
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Proceedings Volume 8884, Optifab 2013; 888423 (2013)
Event: SPIE Optifab, 2013, Rochester, New York, United States
The preliminary results in the fabrication of off-axis optical surfaces are presented. The propose using the conventional polishing method and with the surface under mechanical stress at its edges. It starts fabricating a spherical surface using ZERODUR® optical glass with the conventional polishing method, the surface is deformed by applying tension and/or compression at the surface edges using a specially designed mechanical mount. To know the necessary deformation, the interferogram of the deformed surface is analyzed in real time with a ZYGO® Mark II Fizeau type interferometer, the mechanical stress is applied until obtain the inverse interferogram associated to the off-axis surface that we need to fabricate. Polishing process is carried out again until obtain a spherical surface, then mechanical stress in the edges are removed and compares the actual interferogram with the theoretical associated to the off-axis surface. To analyze the resulting interferograms of the surface we used the phase shifting analysis method by using a piezoelectric phase-shifter and Durango® interferometry software from Diffraction International™.
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R. Izazaga-Pérez, D. Aguirre-Aguirre, M. E. Percino-Zacarías, and Fermin-Salomon Granados-Agustín "Off-axis mirror fabrication from spherical surfaces under mechanical stress", Proc. SPIE 8884, Optifab 2013, 888423 (15 October 2013);


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