Coring 7980 is the used widely in optics,Coring 7740/Coring 7979/Coring 8265 are also available from Yutai Optics, while now Coring 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