LASFN21 by Sumita

Obsolete Very Rare Environmentally Dangerous
Refractive Index vs Wavelength
Refractive Index Calculator
Valid range: 0.27–2.0 µm
dn/dλ vs Wavelength
dn/dλ Calculator
Valid range: 0.27–2.0 µm
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Valid wavelength range: 0.370–2.000 µm
Optical Properties
Refractive Index (nd) 1.85
Abbe Number (Vd) 32.4
Dispersion Formula Schott
Wavelength Range 0.27 — 2.0 µm
$$n(\lambda) = \sqrt{3.30723 - 0.0176207\,\lambda^2 + 0.0357424\,\lambda^{-2} + 0.00239222\,\lambda^{-4} - 0.000134264\,\lambda^{-6} + 1.44644 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
TCE -30/70°C (10-6/K) —
TCE 100/300°C (10-6/K) 7.6
Thermal Conductivity (W/mK) —
Heat Capacity (J/gK) —
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right] \Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
Density (g/cm³) 4.74
Relative Cost —
Mechanical Properties
Young's Modulus (GPa) —
Poisson's Ratio —
Knoop Hardness (kgf/mm²) —
Chemical Resistance
Climatic Resistance 1
Stain Resistance —
Acid Resistance 3
Alkali Resistance —
Phosphate Resistance —
Similar Glasses (Other Manufacturers)
Glass Manufacturer nd Vd
H-ZLAF71 CDGM 1.85026 32.297288
LAH71 Ohara 1.850259 32.28594
S-LAH71 Ohara 1.850259 32.27012
H-ZLAF71AGT CDGM 1.85026 32.216801
TAFD9 Hoya 1.850299 32.181026
N-LASF9 Schott 1.85025 32.17
LASFN9 Schott 1.85025 32.17
N-LASF9HT Schott 1.85025 32.17
IRG3 Generic IR 1.844836 32.330322
H-ZLAF76 CDGM 1.85013 30.055517
Similar Glasses (Sumita)
Glass Manufacturer nd Vd
K-LaSFn21 Sumita 1.85 32.4
K-GIR79 Sumita 1.8592 33.0
K-VC91(M) Sumita 1.88175 34.9
LASFN14 Sumita 1.834 37.2
K-PSFn185(M) Sumita 1.84524 27.1
K-LaSFn14 Sumita 1.834 37.3
K-PSFn185 Sumita 1.8507 26.9
K-VC91 Sumita 1.8866 35.0
K-VC90(M) Sumita 1.84859 38.9
K-VC90 Sumita 1.8528 39.0
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