Hextek Corp.

45 cm diameter 60% lightweight mirror (Photo courtesy LANL)

Physical
◦    Lightweight Gas-Fusion mirrors available in excess of 1 m diameter
◦    Gas-Fusion bonding results in 100% bubble-free, monolithic joints; no frits used
◦    Faceplate thickness from 3 mm to 12 mm
◦    Rib thickness from 1 mm to 5 mm
◦    Virtually any outline available: circular, octagonal, rectangular, etc. (see Design Flexibility below.)
◦    Central perforations available
◦    Fused neutral plane mounting bosses
◦    Slumping in meniscus forms, both concave and convex, to f/0.5 while keeping 6:1 aspect ratio
◦    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 
Mechanical
◦    Self-weight deflection less than a solid blank of same dimensions
◦    Will withstand in excess of 35 g uniform loading
◦    Successfully launched into space in a satellite
◦    Successfully used in turboprop airborne optical systems
◦    Typical residual faceplate stresses are 10nm/cm
◦    All rib-faceplate and rib-rib joints are smooth fillets
◦    Lightweight blanks create equivalent weight saving flow down in supporting structures

Thermal
◦    Thermal CTE is 3.2 X 10-6/°C
◦    Thermal time constant shorter than a solid in proportion to degree of lightweighting
◦    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
◦    Figure accuracies of less that 1/20l p-v readily achievable on 0.8 m diameter plano mirrors
◦    1 m diameter, f/0.5 sphere polished to 1/20l rms
◦    Gas-Fusion mirrors durably coated with all metals and high efficiency dielectric stacks
◦    More on Optical Capabilities

PV = 0.067 &nbspRMS = 0.012 &nbspPTS = 19968

PV = 0.067 &nbspRMS = 0.012 &nbspPTS = 19968

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Design Flexibility * The Gas-Fusion™ process is adaptable to virtually any geometry. Photo at left shows the unique geometry of a prototype 40" x 18" borosilicate optical platform

Gas-Fusion™ substrates are capable of being slumped to extremely fast curves. Pictured at right are two f/0.5 one meter blanks, eventually polished to 1/4- wave in the IR.