K-LaFn5 by Sumita
Standard
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) | 1.743 |
|---|---|
| Abbe Number (Vd) | 49.2 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36 — 1.55 µm |
$$n(\lambda) = \sqrt{2.97466 - 0.0154904\,\lambda^2 + 0.0216764\,\lambda^{-2} + 0.000790795\,\lambda^{-4} - 3.50692 \times 10^{-5}\,\lambda^{-6} + 2.12354 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 5.1 |
|---|---|
| TCE 100/300°C (10-6/K) | 7.1 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[2.26 \times 10^{-6} + 2(2.18 \times 10^{-8})\,\Delta T + 3(-2.34 \times 10^{-10})\,\Delta T^2 + \frac{5.21 \times 10^{-7} + 2(6.65 \times 10^{-10})\,\Delta T}{\lambda - 0.203}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.05 |
|---|---|
| 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 | |
|---|---|---|---|---|
| NBF1 | Hoya | 1.7433 | 49.22 | |
| H-LAF53 | CDGM | 1.7433 | 49.221808 | |
| L-LAM60 | Ohara | 1.743198 | 49.295578 | |
| LAM60 | Ohara | 1.743198 | 49.309053 | |
| D-LAF53-25 | CDGM | 1.7421 | 49.246024 | |
| D-LAF53 | CDGM | 1.7433 | 49.325949 | |
| M-NBF1 | Hoya | 1.7433 | 49.33 | |
| MC-NBF1 | Hoya | 1.7433 | 49.33 | |
| MP-NBF1 | Hoya | 1.7433 | 49.33 | |
| S-LAM60 | Ohara | 1.743198 | 49.339444 |
Similar Glasses (Sumita)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| LAFN5 | Sumita | 1.743 | 49.2 | |
| LAFN7 | Sumita | 1.735 | 49.5 | |
| LAKN12 | Sumita | 1.7335 | 51.2 | |
| LAFN8 | Sumita | 1.756 | 47.6 | |
| K-LaFK50T(M) | Sumita | 1.76209 | 49.6 | |
| K-LaFK50T | Sumita | 1.766 | 49.8 | |
| K-LaK10 | Sumita | 1.72 | 50.3 | |
| LAK10 | Sumita | 1.72 | 50.3 | |
| K-LaFK50(M) | Sumita | 1.76831 | 49.7 | |
| K-LaKn14 | Sumita | 1.741 | 52.7 |