M-LAF81 by Hoya
Special
Very Rare
Precision Molding
Environmentally Friendly
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) | 1.73077 |
|---|---|
| Abbe Number (Vd) | 40.5 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36501 — 1.5296 µm |
$$n(\lambda) = \sqrt{2.91679 - 0.0123982\,\lambda^2 + 0.0266752\,\lambda^{-2} + 0.000651905\,\lambda^{-4} + 4.69562 \times 10^{-6}\,\lambda^{-6} + 2.69105 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.9 |
|---|---|
| TCE 100/300°C (10-6/K) | 11.3 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.72608 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 3.22 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 5 |
| Acid Resistance | 3 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Notes
Not in a position to accept new order because of discontinuation.
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| D-LAF79 | CDGM | 1.73077 | 40.508021 | |
| L-LAM69 | Ohara | 1.73077 | 40.508156 | |
| D-LAF79-25 | CDGM | 1.72986 | 40.497566 | |
| LAFN8 | Schott | 1.735197 | 41.590899 | |
| S-LAM58 | Ohara | 1.72 | 41.978463 | |
| LAM58 | Ohara | 1.72 | 41.989859 | |
| LAFN10 | Sumita | 1.72016 | 42.1 | |
| BASF51 | Schott | 1.723728 | 38.111094 | |
| BAH78 | Ohara | 1.723421 | 38.03427 | |
| BASF8 | Sumita | 1.72342 | 38.0 |