Reference : Figuring sequences on a super-smooth sample
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Figuring sequences on a super-smooth sample
Tock, Jean-Philippe mailto [ > > ]
Collette, Jean-Paul [ > > ]
Gailly, Patrick mailto [Université de Liège - ULiège > > CSL (Centre Spatial de Liège) >]
Kampf, Dirk mailto [ > > ]
Optical Fabrication and Testing, Proc. SPIE Volume: 3739
Geyl, Roland
Maxwell, Jonathan
Proceedings of SPIE Volume: 3739
EUROPTO Conference on Optical Fabrication and Testing 1999
May 1999
[en] ion beam figuring ; IBF ; optical fabrication ; aluminium ; nickel ; polishing
[en] An ion beam figuring facility is operational at the Centre Spatial de Liège since 1997. Its present capabilities are described. An extensive characterisation programme is running in order to determine the optimised parameters for various materials and operating conditions. In this frame, tests have been performed on a spherical gold-coated aluminium mirror plated in between with nickel. The nickel plating was used to be super-polished to a BRDF of 1 10-4 at 1 deg at 10 µm wavelength. Micro-roughness and etching rate measurements were realised and influence of ion bombardment on the coating has been established after removal of the gold coating. The gold coating removing was performed by using the ion beam flux.
Finally, the mirror has been figured from the original sphere to a parabola. Surface characteristics evolution is also described in terms of micro-roughness and surface error.
An overview of the research and development programmes related to this facility is given. Results of this technique and potential impact on optics fabrication are then briefly exposed.
Région wallonne : Direction générale des Technologies, de la Recherche et de l'Energie - DGTRE
Etude du polissage ionique (II)

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