LAK8 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) | 1.713 |
|---|---|
| Abbe Number (Vd) | 53.9 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{2.8792 - 0.0146914\,\lambda^2 + 0.0196349\,\lambda^{-2} + 0.000403651\,\lambda^{-4} - 1.29366 \times 10^{-6}\,\lambda^{-6} + 2.29972 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | — |
|---|---|
| TCE 100/300°C (10-6/K) | 7.5 |
| 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) | 3.79 |
|---|---|
| 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 | |
|---|---|---|---|---|
| S-LAL8 | Ohara | 1.712995 | 53.867058 | |
| LAC8 | Hoya | 1.713 | 53.94 | |
| M-LAC8 | Hoya | 1.713 | 53.94 | |
| LAL8 | Ohara | 1.712995 | 53.845848 | |
| D13-54 | Corning | 1.713 | 53.843096 | |
| MP-LAC8-30 | Hoya | 1.7133 | 53.95 | |
| H-LAK7A | CDGM | 1.713 | 53.832974 | |
| LAK8 | Schott | 1.713003 | 53.831633 | |
| N-LAK8 | Schott | 1.713 | 53.83 | |
| LAL60 | Ohara | 1.725999 | 53.565698 |