N-LASF55 by Schott

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Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.365–2.5 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.365–2.5 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.370–2.500 µm
Optical Properties
Refractive Index (nd) 1.9538
Abbe Number (Vd) 30.56
Dispersion Formula Sellmeier
Wavelength Range 0.365 — 2.5 µm
$$n(\lambda) = \sqrt{1 + \frac{2.30861\,\lambda^2}{\lambda^2 - 0.0130447} + \frac{0.354737\,\lambda^2}{\lambda^2 - 0.0557524} + \frac{1.92227\,\lambda^2}{\lambda^2 - 133.197}}$$
Thermal Properties
TCE -30/70°C (10-6/K) 6.61
TCE 100/300°C (10-6/K) 7.74
Thermal Conductivity (W/mK) 0.9
Heat Capacity (J/gK) 0.5
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.25 \times 10^{-6} + 2(1.09 \times 10^{-8})\,\Delta T + 3(-1.64 \times 10^{-11})\,\Delta T^2 + \frac{9.64 \times 10^{-7} + 2(1.25 \times 10^{-9})\,\Delta T}{\lambda - 0.262}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.855
Relative Cost 5.0
Mechanical Properties
Young's Modulus (GPa) 126.08
Poisson's Ratio 0.3
Knoop Hardness (kgf/mm²) 710.0
Chemical Resistance
Climatic Resistance 1
Stain Resistance 0
Acid Resistance 2
Alkali Resistance 1
Phosphate Resistance 1
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd
M-TAFD405 Hoya 1.9515 29.83
MP-TAFD405 Hoya 1.9515 29.83
H-ZLAF89LA CDGM 1.95375 32.276235
H-ZLAF89L CDGM 1.95375 32.30879
TAFD45 Hoya 1.95375 32.32
TAFD45L Hoya 1.95375 32.32
S-LAH98 Ohara 1.953749 32.324727
CAWO4-E Generic Birefringent 1.937211 33.304949
TAFD21 Hoya 1.9326 27.921009
NBFD265 Hoya 1.95203 26.2
Similar Glasses (Schott)
Glass Manufacturer nd Vd
LASF18A Schott 1.913482 32.364492
REALVIEW_2.0 Schott 2.001017 29.14
N-LASF46A Schott 1.90366 31.32
N-LASF46B Schott 1.90366 31.32
N-LASF46 Schott 1.90138 31.64
LASF35 Schott 2.02204 29.06
REALVIEW_1.9_LIGHTWEIGHT Schott 1.922002 21.44
SF59 Schott 1.952497 20.363706
SF58 Schott 1.917613 21.51112
SF66 Schott 1.92286 20.88
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