K-LaFK50L by Sumita
Standard
Rare
Precision Molding
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) | 1.7682 |
|---|---|
| Abbe Number (Vd) | 50.0 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36 — 1.55 µm |
$$n(\lambda) = \sqrt{3.05738 - 0.0120552\,\lambda^2 + 0.0236383\,\lambda^{-2} + 0.000624764\,\lambda^{-4} - 2.22442 \times 10^{-5}\,\lambda^{-6} + 1.883 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 6.7 |
|---|---|
| TCE 100/300°C (10-6/K) | 9.3 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-2.04 \times 10^{-7} + 2(8.68 \times 10^{-9})\,\Delta T + 3(-2.18 \times 10^{-10})\,\Delta T^2 + \frac{6.17 \times 10^{-7} + 2(8.51 \times 10^{-10})\,\Delta T}{\lambda - 0.212}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 5.15 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 3 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| MC-TAF115 | Hoya | 1.77047 | 49.46 | |
| TAF1 | Hoya | 1.7725 | 49.63 | |
| N-LAF34 | Schott | 1.7725 | 49.62 | |
| LAH66 | Ohara | 1.772499 | 49.60134 | |
| H-LAF50B | CDGM | 1.7725 | 49.598996 | |
| S-LAH66 | Ohara | 1.772499 | 49.598371 | |
| D-LAF050 | CDGM | 1.76842 | 49.28216 | |
| MP-TAF101-100 | Hoya | 1.76902 | 49.29 | |
| MC-TAF101-100 | Hoya | 1.76902 | 49.29 | |
| M-TAF101 | Hoya | 1.76802 | 49.24 |
Similar Glasses (Sumita)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| K-LaFK50(M) | Sumita | 1.76831 | 49.7 | |
| K-LaFK50T | Sumita | 1.766 | 49.8 | |
| K-LaFK50 | Sumita | 1.772 | 50.0 | |
| K-LaSFn7 | Sumita | 1.7725 | 49.6 | |
| LASFN7 | Sumita | 1.7725 | 49.6 | |
| K-LaFK50T(M) | Sumita | 1.76209 | 49.6 | |
| LASKN3 | Sumita | 1.774 | 50.5 | |
| LAFN8 | Sumita | 1.756 | 47.6 | |
| K-LaSKn1 | Sumita | 1.755 | 52.4 | |
| LASKN1 | Sumita | 1.755 | 52.4 |