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Woodard K.S.,Corning CSM Advanced Optics | Comstock L.E.,Corning CSM Advanced Optics | Wamboldt L.,Corning CSM Advanced Optics | Crifasi J.C.,Corning CSM Advanced Optics
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2014

Extreme light-weighting is important in many aerospace and defense applications but the cost associated with beryllium or other exotic materials can be prohibitive. The current standard for producing cost effective, high performance mirrors is to diamond machine mirror blanks from aluminum alloy stock. About 80% material removal is the limit for geometrical lightweighting while still retaining the structural integrity required for optical fabrication. To reduce weight further requires alternative materials. This paper summarizes the status of diamond machined finishing and coating of magnesium alloys to produce cost effective, lightweight mirrors with high, broadband reflectivity and low scatter finish. © 2014 SPIE. Source


Woodard K.S.,Corning CSM Advanced Optics | Comstock L.E.,Corning CSM Advanced Optics | Wamboldt L.,Corning CSM Advanced Optics | Roy B.P.,Corning CSM Advanced Optics
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

The demand for high performance, lightweight mirrors was historically driven by aerospace and defense (A&D) but now we are also seeing similar requirements for commercial applications. These applications range from aerospace-like platforms such as small unmanned aircraft for agricultural, mineral and pollutant aerial mapping to an eye tracking gimbaled mirror for optometry offices. While aerospace and defense businesses can often justify the high cost of exotic, low density materials, commercial products rarely can. Also, to obtain high performance with low overall optical system weight, aspheric surfaces are often prescribed. This may drive the manufacturing process to diamond machining thus requiring the reflective side of the mirror to be a diamond machinable material. This paper summarizes the diamond machined finishing and coating of some high performance, lightweight designs using non-exotic substrates to achieve cost effective mirrors. The results indicate that these processes can meet typical aerospace and defense requirements but may also be competitive in some commercial applications. © 2015 SPIE. Source

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