45 cm diameter 60% lightweight mirror
(Photo courtesy LANL)
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Physical
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Lightweight Gas-Fusion mirrors available in excess of 1 m diameter
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Gas-Fusion bonding results in 100% bubble-free, monolithic joints; no frits
used
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Faceplate thickness from 3 mm to 12 mm
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Rib thickness from 1 mm to 5 mm
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Virtually any outline available: circular, octagonal, rectangular, etc. (see Design Flexibility below.)
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Central perforations available
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Fused neutral plane mounting bosses
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Slumping in meniscus forms, both concave and convex, to f/0.5 while keeping
6:1 aspect ratio
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Up to 85% lightweighting available in raw blank; further weight reduction
possible during optical fabrication
- Areal Densities below 10 kg/m2. (Details)
MATERIAL SPECIFIC DATA: Schott Glass Data Sheet
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Mechanical
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Self-weight deflection less than a solid blank of same dimensions
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Will withstand in excess of 35 g uniform loading
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Successfully launched into space in a satellite
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Successfully used in turboprop airborne optical systems
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Typical residual faceplate stresses are 10nm/cm
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All rib-faceplate and rib-rib joints are smooth fillets
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Lightweight blanks create equivalent weight saving flow down in supporting
structures
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Thermal
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Thermal CTE is 3.2 X 10-6/°C
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Thermal time constant shorter than a solid in proportion to degree of lightweighting
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Gas-Fusion™ borosilicate mirrors perform extremely well at cryogenic temperatures, and have been tested at 79°K with less than 1/10l
p-v figure change from room tempertature
CRYOGENIC DATA:Cryo_Summary.pdf download
Optical
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Figure accuracies of less that 1/20l p-v readily
achievable on 0.8 m diameter plano mirrors
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1 m diameter, f/0.5 sphere polished to 1/20l
rms
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Gas-Fusion mirrors durably coated with all metals and high efficiency dielectric
stacks
More on Optical Capabilities
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PV = 0.067 RMS = 0.012 PTS = 19968
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PV = 0.067 RMS = 0.012 PTS = 19968
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