LAFN12 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) | 1.7569 |
|---|---|
| Abbe Number (Vd) | 31.7 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{2.98386 - 0.0121917\,\lambda^2 + 0.0322838\,\lambda^{-2} + 0.00179111\,\lambda^{-4} - 0.000106809\,\lambda^{-6} + 1.55625 \times 10^{-5}\,\lambda^{-8}}$$
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) | 4.19 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 4 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| LAF11A | Schott | 1.756927 | 31.702906 | |
| NBFD9 | Hoya | 1.756898 | 31.798532 | |
| BPH50 | Ohara | 1.739997 | 31.710001 | |
| ADF505 | Hoya | 1.739996 | 31.655919 | |
| S-NBH53 | Ohara | 1.737999 | 32.261312 | |
| S-NBH53V | Ohara | 1.737999 | 32.32659 | |
| H-TF29 | CDGM | 1.77047 | 29.806014 | |
| NBFD29 | Hoya | 1.77047 | 29.74 | |
| BASF54 | Schott | 1.73627 | 32.149453 | |
| N-LAF7 | Schott | 1.7495 | 34.82 |