Testing large flats with computer generated holograms

Giorgio Pariani; Daniela Tresoldi; Paolo Spanò; Andrea Bianco

doi:10.1117/12.927064

13 September 2012 Testing large flats with computer generated holograms

Giorgio Pariani, Daniela Tresoldi, Paolo Spanò, Andrea Bianco

Proceedings Volume 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II; 84500Z (2012) https://doi.org/10.1117/12.927064
Event: SPIE Astronomical Telescopes + Instrumentation, 2012, Amsterdam, Netherlands

Abstract

We describe the optical test of a large flat based on a spherical mirror and a dedicated CGH. The spherical mirror, which can be accurately manufactured and tested in absolute way, allows to obtain a quasi collimated light beam, and the hologram performs the residual wavefront correction. Alignment tools for the spherical mirror and the hologram itself are encoded in the CGH. Sensitivity to fabrication errors and alignment has been evaluated. Tests to verify the effectiveness of our approach are now under execution.

Citation Download Citation

Giorgio Pariani, Daniela Tresoldi, Paolo Spanò, and Andrea Bianco "Testing large flats with computer generated holograms", Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 84500Z (13 September 2012); https://doi.org/10.1117/12.927064

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