K-LaK11 by Sumita
Standard
Rare
Environmentally Friendly
K-LaK11 by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.28 to 2.00 µm with an nd of 1.6583 and a Vd of 57.3. It has low thermal expansion (CTE of 5.6×10⁻⁶/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) | 5.6 |
|---|---|
| TCE 100/300°C (10-6/K) | 8.5 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-2.69 \times 10^{-6} + 2(1.38 \times 10^{-8})\,\Delta T + 3(-5.45 \times 10^{-11})\,\Delta T^2 + \frac{4.86 \times 10^{-7} + 2(7.71 \times 10^{-10})\,\Delta T}{\lambda - 0.155}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 4 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| LAL11 | Ohara | 1.658296 | 57.332589 | |
| S-LAL11 | Ohara | 1.658296 | 57.332589 | |
| LAC11 | Hoya | 1.658296 | 57.262085 | |
| LAK11 | Schott | 1.658302 | 57.261599 | |
| C57-57 | Corning | 1.657503 | 57.198059 | |
| H-LAK1 | CDGM | 1.6595 | 57.34726 | |
| LAC7 | Hoya | 1.6516 | 58.4 | |
| H-LAK50A | CDGM | 1.6516 | 58.403057 | |
| LAK23 | Schott | 1.668816 | 57.38444 | |
| S-LAL54Q | Ohara | 1.651 | 56.238379 |