LAKN9 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) | 1.678 |
|---|---|
| Abbe Number (Vd) | 53.3 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{2.76116 - 0.0100398\,\lambda^2 + 0.0188262\,\lambda^{-2} + 0.000460126\,\lambda^{-4} - 2.1154 \times 10^{-5}\,\lambda^{-6} + 1.60134 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | — |
|---|---|
| TCE 100/300°C (10-6/K) | 8.8 |
| 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) | 3.99 |
|---|---|
| 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 | |
|---|---|---|---|---|
| LACL8 | Hoya | 1.677896 | 53.419218 | |
| BBO | Generic Birefringent | 1.670737 | 52.593907 | |
| D-LAK5-25 | CDGM | 1.67686 | 54.805426 | |
| L-LAL12 | Ohara | 1.6779 | 54.88744 | |
| D-LAK5 | CDGM | 1.6779 | 54.889665 | |
| LAKL12 | Schott | 1.6779 | 54.92 | |
| LACL3 | Hoya | 1.664798 | 53.401295 | |
| LAKN12 | Schott | 1.6779 | 55.199566 | |
| N-LAK12 | Schott | 1.6779 | 55.2 | |
| H-LAK67 | CDGM | 1.67 | 51.738482 |