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Basic Properties of SF11 and N-SF11 Glass   SF11 N-SF11 (RoHS) Transparency Range 410 - 2000 nm 410 - 2000 nm Density  4.8 g/cm3 3.2 g/cm3 Thermo-Optic Coefficients (dn/dT) 6.6 x 10-6 /oC -2.1 x 10-6 /oC Optical Homogeneity  Δn < 10-4/cm  Δn < 10-4/cm Knoop Hardness  450 615 Abrasion Aa N/A 187 Thermal Expansion Coefficient 8.2 x 10-6/K 9.4 x 10-6/K Thermal Conductivity  0.74 W/m/K 0.95 W/m/K Sellmeier Equations  (λ in μm): n2=1+1.73848λ2/( λ2 - 0.013607 ) + 0.31117λ2/(λ2-0.061596)+1.17491 λ2 /(λ2-121.92271)   n2=1+1.73760λ2/( λ2 - 0.013189) + 0.31375λ2/(λ2-0.062307)+ 1.89878 λ2 /(λ2-155.23629) Wavelength (nm) Refractive Index 1550 1.7447 1.7434 1320 1.7486 1.7478 1064 1.7543 1.7539 800 1.7648 1.7646 632.8 1.7786 1.7786 532 1.7948 1.7948 Transmission curve:

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