LASFN1 by Sumita
Obsolete
Very Rare
Environmentally Dangerous
Refractive Index vs Wavelength
Refractive Index Calculator
dn/dλ vs Wavelength
dn/dλ Calculator
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Optical Properties
| Refractive Index (nd) | 1.806 |
|---|---|
| Abbe Number (Vd) | 40.7 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{3.1707 - 0.0126818\,\lambda^2 + 0.0303097\,\lambda^{-2} + 0.000941977\,\lambda^{-4} - 2.8288 \times 10^{-5}\,\lambda^{-6} + 4.54152 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | — |
|---|---|
| TCE 100/300°C (10-6/K) | 8.6 |
| 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) | 4.26 |
|---|---|
| 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 | |
|---|---|---|---|---|
| M-NBFD130 | Hoya | 1.8061 | 40.73 | |
| MC-NBFD130 | Hoya | 1.8061 | 40.73 | |
| MC-NBFD130L | Hoya | 1.8061 | 40.73 | |
| MP-NBFD130 | Hoya | 1.8061 | 40.73 | |
| NBFD13 | Hoya | 1.8061 | 40.73 | |
| M-NBFD13 | Hoya | 1.8061 | 40.740652 | |
| N-LASF43 | Schott | 1.8061 | 40.61 | |
| P-LASF47 | Schott | 1.8061 | 40.9 | |
| L-LAH53 | Ohara | 1.806249 | 40.907302 | |
| S-LAH53 | Ohara | 1.806098 | 40.925996 |