K-LaK10 by Sumita
Standard
Rare
Environmentally Friendly
K-LaK10 by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.31 to 2.00 µm with an nd of 1.72 and a Vd of 50.3. It has medium thermal expansion (CTE of 7.2×10⁻⁶/K) and average chemical resistance.
Refractive Index vs Wavelength
Refractive Index Calculator
dn/dλ vs Wavelength
dn/dλ Calculator
Abbe Number Calculator
Transmission vs Wavelength
Transmission Calculator
Optical Properties
Thermal Properties
| TCE -30/70°C (10-6/K) | 7.2 |
|---|---|
| TCE 100/300°C (10-6/K) | 8.6 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-2.63 \times 10^{-6} + 2(2.02 \times 10^{-8})\,\Delta T + 3(-6.98 \times 10^{-11})\,\Delta T^2 + \frac{5.94 \times 10^{-7} + 2(9.57 \times 10^{-10})\,\Delta T}{\lambda - 0.184}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 4 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| D20-50 | Corning | 1.720003 | 50.312121 | |
| H-LAK8B | CDGM | 1.72 | 50.280736 | |
| H-LAK8A | CDGM | 1.72 | 50.343857 | |
| LAL10 | Ohara | 1.719995 | 50.254429 | |
| LAC10 | Hoya | 1.72 | 50.35 | |
| S-LAL10 | Ohara | 1.719995 | 50.230564 | |
| LAK10 | Schott | 1.72 | 50.41004 | |
| N-LAK10 | Schott | 1.72003 | 50.62 | |
| H-LAK72 | CDGM | 1.713 | 51.80665 | |
| TAC4 | Hoya | 1.734 | 51.05 |