LASFN22 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) | 1.898 |
|---|---|
| Abbe Number (Vd) | 34.0 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{3.48103 - 0.017198\,\lambda^2 + 0.0377373\,\lambda^{-2} + 0.00251311\,\lambda^{-4} - 0.000175219\,\lambda^{-6} + 1.62195 \times 10^{-5}\,\lambda^{-8}}$$
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) | 5.19 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| S-LAH93 | Ohara | 1.90525 | 35.036826 | |
| TAFD35 | Hoya | 1.91082 | 35.25 | |
| TAFD35L | Hoya | 1.91082 | 35.25 | |
| H-ZLAF4LA | CDGM | 1.91082 | 35.25034 | |
| H-ZLAF4LB | CDGM | 1.91082 | 35.282389 | |
| N-LASF46 | Schott | 1.90138 | 31.64 | |
| LAH78 | Ohara | 1.901355 | 31.550244 | |
| LASF18A | Schott | 1.913482 | 32.364492 | |
| H-ZLAF75B | CDGM | 1.90366 | 31.418411 | |
| H-ZLAF75C | CDGM | 1.90366 | 31.357126 |