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97% for 450 nm 2 m, >95% for 2 20 m Substrate Fused Silica Surface Flatness (Peak to Valley) 10 @ 633 nm Surface Quality 40 20 Scratch Dig Parallelism <3 arcmin Clear Aperture >90% of Diameter Damage Threshold Pulsed 0." name="description"/> 97% for 450 nm 2 m, >95% for 2 20 m Substrate Fused Silica Surface Flatness (Peak to Valley) 10 @ 633 nm Surface Quality 40 20 Scratch Dig Parallelism <3 arcmin Clear Aperture >90% of Diameter Damage Threshold Pulsed 0." property="og:description"/> 97% for 450 nm 2 m, >95% for 2 20 m Substrate Fused Silica Surface Flatness (Peak to Valley) 10 @ 633 nm Surface Quality 40 20 Scratch Dig Parallelism <3 arcmin Clear Aperture >90% of Diameter Damage Threshold Pulsed 0." name="twitter:description"/>
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