Corning 7980 is the used widely in optics,Corning 7740/Corning 7979/Corning 8265 are also available from Yutai Optics, while now Corning 8655 is not available in the material market.
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How to consider when choosing Fused Silica?
Price
Optical homogeneity
Transmission
Absorption
Refractive index
Dispersion
Inclusion content or Bubbles
Residual strain
Fluorescence
Resistance to light induced defects or irradiation