LAC12 by Hoya
Special
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) | 1.6779 |
|---|---|
| Abbe Number (Vd) | 55.52 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36501 — 1.5296 µm |
$$n(\lambda) = \sqrt{2.76348 - 0.0110683\,\lambda^2 + 0.0182464\,\lambda^{-2} + 0.000376974\,\lambda^{-4} - 1.77887 \times 10^{-5}\,\lambda^{-6} + 1.53143 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 7.7 |
|---|---|
| TCE 100/300°C (10-6/K) | 9.0 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.10512 \times 10^{-6} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 3.8 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 3 |
|---|---|
| Stain Resistance | 5 |
| Acid Resistance | 4 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Notes
Not in a position to accept new order because of discontinuation.
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| H-LAK5A | CDGM | 1.6779 | 55.51497 | |
| C78-56 | Corning | 1.678004 | 55.519168 | |
| K-LaK12 | Sumita | 1.6779 | 55.5 | |
| LAK12 | Sumita | 1.6779 | 55.5 | |
| S-LAL12Q | Ohara | 1.6779 | 55.346888 | |
| S-LAL12 | Ohara | 1.6779 | 55.341195 | |
| LAL12 | Ohara | 1.6779 | 55.337587 | |
| N-LAK12 | Schott | 1.6779 | 55.2 | |
| LAKN12 | Schott | 1.6779 | 55.199566 | |
| LAKL12 | Schott | 1.6779 | 54.92 |