N-SF66 by Schott

Preferred Unknown Environmentally Friendly

N-SF66 by Schott is a preferred optical glass. It transmits from 0.39 to 2.50 µm with an nd of 1.92286 and a Vd of 20.88. It has low thermal expansion (CTE of 5.9×10⁻⁶/K), excellent chemical resistance, and moderate relative cost.

Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.39–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.39–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.390–2.500 µm
Optical Properties
Refractive Index (nd) 1.92286
Abbe Number (Vd) 20.88
Dispersion Formula Sellmeier
Wavelength Range 0.39 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{2.0246\,\lambda^2}{\lambda^2 - 0.0147053} + \frac{0.470187\,\lambda^2}{\lambda^2 - 0.0692998} + \frac{2.5997\,\lambda^2}{\lambda^2 - 161.818}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 5.9
TCE 100/300°C (10-6/K) 6.83
Thermal Conductivity (W/mK) 0.8
Heat Capacity (J/gK) 0.54
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-4.3 \times 10^{-6} + 2(1.15 \times 10^{-8})\,\Delta T + 3(4.31 \times 10^{-11})\,\Delta T^2 + \frac{9.62 \times 10^{-7} + 2(1.62 \times 10^{-9})\,\Delta T}{\lambda - 0.322}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 3.996
Relative Cost 3.1
Mechanical Properties
Young's Modulus (GPa) 94.9
Poisson's Ratio 0.26
Knoop Hardness (kgf/mm²) 440.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance 0
Acid Resistance 1
Alkali Resistance 1
Phosphate Resistance 1
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd Compare
MP-FDS1 Hoya 1.92286 20.88
E-FDS1-W Hoya 1.92286 20.88
E-FDS1 Hoya 1.92286 20.88
M-FDS1 Hoya 1.92286 20.88
H-ZF62 CDGM 1.92286 20.879915
H-ZF62GT CDGM 1.92286 20.879915
FDS1 Hoya 1.922859 20.883457
PBH21 Ohara 1.922861 20.884172
PBH71 Ohara 1.922864 21.288699
PBH72 Ohara 1.915356 21.171926
Similar Glasses (Schott)
Glass Manufacturer nd Vd Compare
SF66 Schott 1.92286 20.88
REALVIEW_1.9_LIGHTWEIGHT Schott 1.922002 21.44
SF58 Schott 1.917613 21.51112
P-SF67 Schott 1.9068 21.4
SF59 Schott 1.952497 20.363706
N-LASF55 Schott 1.9538 30.56
SFL57 Schott 1.84666 23.62
SF57HHT Schott 1.84666 23.779912
N-SF57 Schott 1.84666 23.78
N-SF57HT Schott 1.84666 23.78
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