LAK10 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) | 1.72 |
|---|---|
| Abbe Number (Vd) | 50.3 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{2.89326 - 0.0102862\,\lambda^2 + 0.0235024\,\lambda^{-2} - 0.000130486\,\lambda^{-4} + 8.2469 \times 10^{-5}\,\lambda^{-6} - 3.97648 \times 10^{-6}\,\lambda^{-8}}$$
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) | 4.08 |
|---|---|
| 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 | |
|---|---|---|---|---|
| D20-50 | Corning | 1.720003 | 50.312121 | |
| H-LAK8B | CDGM | 1.72 | 50.280736 | |
| H-LAK8A | CDGM | 1.72 | 50.343857 | |
| LAL10 | Ohara | 1.719995 | 50.254429 | |
| LAC10 | Hoya | 1.72 | 50.35 | |
| S-LAL10 | Ohara | 1.719995 | 50.230564 | |
| LAK10 | Schott | 1.72 | 50.41004 | |
| N-LAK10 | Schott | 1.72003 | 50.62 | |
| H-LAK72 | CDGM | 1.713 | 51.80665 | |
| TAC4 | Hoya | 1.734 | 51.05 |