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Basic Properties of BK7 and N-BK7 Glass   BK7 N-BK7 (RoHS) Transparency Range 360 - 2000 nm 360 - 2500 nm Density 2.51 g/cm3 2.51 g/cm3 Thermo-Optic Coefficients (dn/dT) 2.3 x 10-6 /oC 2.3 x 10-6 /oC Optical Homogeneity Δn < 10-6/cm Δn < 10-6/cm Knoop Hardness  610  610  Thermal Conductivity 1.1 W/m/K 1.1 W/m/K Thermal Expansion Coefficients  8 x 10-6/K 7.1 x 10-6/K Sellmeier Equations (λ in µm) n2=1+1.03961λ2/(λ2- 0.0060007 )+0.23179λ2/(λ2-0.020018)+1.01047 λ2/(λ2-103.5600)   n2=1+1.03961λ2/(λ2- 0.0060007 )+0.23179λ2/(λ2-0.020018)+1.01047 λ2/(λ2-103.5607) Wavelength (nm) Index of Refraction 400 1.5308 1.5308 532 1.5194 1.5194 588 1.5167 1.5167 632.8 1.5150 1.5150 800 1.5108 1.5108 1064 1.5066 1.5066 Transmission curve:

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