10 June 2004 Magnetorheological finishing for imprinting continuous-phase plate structures onto optical surfaces
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Abstract
Magnetorheological finishing (MRF) techniques have been developed to manufacture continuous phase plates (CPPs) and custom phase corrective structures on polished fused silica surfaces. These phase structures are important for laser applications requiring precise manipulation and control of beam-shape, energy distribution, and wavefront profile. The MRF’s unique deterministic-sub-aperture polishing characteristics make it possible to imprint complex topographical information onto optical surfaces at spatial scale-lengths approaching 1 mm. In this study, we present the results of experiments and model calculations that explore imprinting two-dimensional sinusoidal structures. Results show how the MRF removal function impacts and limits imprint fidelity and what must be done to arrive at a high quality surface. We also present several examples of this imprinting technology for fabrication of phase correction plates and CPPs for use at high fluences.
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Joseph A. Menapace, Sham N. Dixit, Francois Y. Genin, Wayne F. Brocious, "Magnetorheological finishing for imprinting continuous-phase plate structures onto optical surfaces", Proc. SPIE 5273, Laser-Induced Damage in Optical Materials: 2003, (10 June 2004); doi: 10.1117/12.527822; http://dx.doi.org/10.1117/12.527822
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KEYWORDS
Magnetorheological finishing

Surface finishing

Polishing

Interferometry

Optics manufacturing

Photovoltaics

National Ignition Facility

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