K-LaFK65(M) 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) | 1.65224 |
|---|---|
| Abbe Number (Vd) | 62.2 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36 — 1.55 µm |
$$n(\lambda) = \sqrt{2.68751 - 0.0115996\,\lambda^2 + 0.0152903\,\lambda^{-2} + 0.000242256\,\lambda^{-4} + 4.10611 \times 10^{-6}\,\lambda^{-6} - 2.07401 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.1 |
|---|---|
| TCE 100/300°C (10-6/K) | 10.3 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-7.58 \times 10^{-6} + 2(9.42 \times 10^{-9})\,\Delta T + 3(-3.47 \times 10^{-11})\,\Delta T^2 + \frac{3.97 \times 10^{-7} + 2(4.24 \times 10^{-10})\,\Delta T}{\lambda - 0.182}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.36 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 5 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| H-LAK4L | CDGM | 1.64 | 60.202769 | |
| LACL60 | Hoya | 1.64 | 60.2 | |
| C41-60 | Corning | 1.640495 | 60.130957 | |
| LAK21 | Schott | 1.640495 | 60.101885 | |
| LACL6 | Hoya | 1.640003 | 60.153568 | |
| N-LAK21 | Schott | 1.64049 | 60.1 | |
| BSM81 | Ohara | 1.639999 | 60.091709 | |
| S-BSM81 | Ohara | 1.639999 | 60.078127 | |
| LAKL21 | Schott | 1.64048 | 59.749915 | |
| S-LAL7 | Ohara | 1.651597 | 58.550655 |
Similar Glasses (Sumita)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| K-LaFK65 | Sumita | 1.6567 | 62.3 | |
| K-LaFK63 | Sumita | 1.6386 | 63.4 | |
| K-LaFK63(M) | Sumita | 1.63463 | 63.0 | |
| K-LaKn2 | Sumita | 1.6405 | 60.1 | |
| LAKN2 | Sumita | 1.6405 | 60.1 | |
| LAFK60 | Sumita | 1.63246 | 63.8 | |
| K-LaFK60 | Sumita | 1.63246 | 63.8 | |
| K-LaFK60(M) | Sumita | 1.62848 | 63.2 | |
| K-LaK7 | Sumita | 1.6516 | 58.3 | |
| LAK7 | Sumita | 1.6516 | 58.3 |