K-LaKn4 by Sumita
Obsolete
Very Rare
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) | 1.671 |
|---|---|
| Abbe Number (Vd) | 57.2 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36 — 1.55 µm |
$$n(\lambda) = \sqrt{2.74496 - 0.0130267\,\lambda^2 + 0.0166615\,\lambda^{-2} + 0.00048278\,\lambda^{-4} - 2.58158 \times 10^{-5}\,\lambda^{-6} + 1.52412 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | — |
|---|---|
| TCE 100/300°C (10-6/K) | 8.5 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-1.88 \times 10^{-6} + 2(1.19 \times 10^{-8})\,\Delta T + 3(-1.1 \times 10^{-10})\,\Delta T^2 + \frac{3.48 \times 10^{-7} + 2(6.14 \times 10^{-10})\,\Delta T}{\lambda - 0.223}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 3.88 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 2 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 5 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| LACL7 | Hoya | 1.669996 | 57.308358 | |
| LAL52 | Ohara | 1.669999 | 57.327972 | |
| S-LAL52 | Ohara | 1.669999 | 57.327972 | |
| LAK23 | Schott | 1.668816 | 57.38444 | |
| H-LAK1 | CDGM | 1.6595 | 57.34726 | |
| LAK11 | Schott | 1.658302 | 57.261599 | |
| LAC11 | Hoya | 1.658296 | 57.262085 | |
| S-LAL11 | Ohara | 1.658296 | 57.332589 | |
| LAL11 | Ohara | 1.658296 | 57.332589 | |
| D-LAK70 | CDGM | 1.6691 | 55.389689 |