LAF2 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) | 1.744 |
|---|---|
| Abbe Number (Vd) | 44.9 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{2.96878 - 0.0121176\,\lambda^2 + 0.0244624\,\lambda^{-2} + 0.000791121\,\lambda^{-4} - 3.39789 \times 10^{-5}\,\lambda^{-6} + 3.98623 \times 10^{-6}\,\lambda^{-8}}$$
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) | 4.03 |
|---|---|
| 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 | |
|---|---|---|---|---|
| LAF2 | Hoya | 1.744 | 44.9 | |
| H-LAF3B | CDGM | 1.744 | 44.900027 | |
| LAF20 | Hoya | 1.744 | 44.872914 | |
| N-LAF2 | Schott | 1.74397 | 44.85 | |
| D44-45 | Corning | 1.744001 | 44.818533 | |
| LAM2 | Ohara | 1.743997 | 44.787528 | |
| S-LAM2 | Ohara | 1.743997 | 44.786431 | |
| LAF2 | Schott | 1.744002 | 44.719972 | |
| P-LAF37 | Schott | 1.7555 | 45.66 | |
| H-LAF6LA | CDGM | 1.757 | 47.711817 |