K-LaKn5 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) | 1.65 |
|---|---|
| Abbe Number (Vd) | 55.8 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36 — 1.55 µm |
$$n(\lambda) = \sqrt{2.67612 - 0.0121088\,\lambda^2 + 0.0161435\,\lambda^{-2} + 0.000519209\,\lambda^{-4} - 2.83953 \times 10^{-5}\,\lambda^{-6} + 1.8555 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | — |
|---|---|
| TCE 100/300°C (10-6/K) | 8.0 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-8.68 \times 10^{-7} + 2(1.28 \times 10^{-8})\,\Delta T + 3(-1.92 \times 10^{-10})\,\Delta T^2 + \frac{5.01 \times 10^{-7} + 2(9.91 \times 10^{-10})\,\Delta T}{\lambda - 0.169}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 3.71 |
|---|---|
| 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 | |
|---|---|---|---|---|
| LACL2 | Hoya | 1.650201 | 55.737216 | |
| N-LAK22 | Schott | 1.65113 | 55.89 | |
| H-LAK10 | CDGM | 1.65113 | 55.890872 | |
| LAKN22 | Schott | 1.65113 | 55.891754 | |
| C51-56 | Corning | 1.651124 | 55.895803 | |
| LAL54 | Ohara | 1.650996 | 56.154774 | |
| S-LAL54 | Ohara | 1.650996 | 56.163717 | |
| S-LAL54Q | Ohara | 1.651 | 56.238379 | |
| C39-56 | Corning | 1.638505 | 55.504447 | |
| BACD18 | Hoya | 1.63854 | 55.45 |