K-LaK6 by Sumita
Standard
Rare
Environmentally Friendly
K-LaK6 by Sumita is a standard optical glass with a rare melt frequency. It transmits from 0.30 to 2.00 µm with an nd of 1.6425 and a Vd of 58.1. It has low thermal expansion (CTE of 6.2×10⁻⁶/K) and below 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) | 6.2 |
|---|---|
| TCE 100/300°C (10-6/K) | 7.9 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-2.11 \times 10^{-6} + 2(1.88 \times 10^{-8})\,\Delta T + 3(-1.93 \times 10^{-10})\,\Delta T^2 + \frac{4.01 \times 10^{-7} + 2(3.43 \times 10^{-10})\,\Delta T}{\lambda - 0.195}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | — |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 4 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| C42-58 | Corning | 1.642502 | 58.061633 | |
| LAKN6 | Schott | 1.642499 | 57.962061 | |
| LAC6 | Hoya | 1.642498 | 57.959359 | |
| BSM36 | Ohara | 1.642495 | 58.369399 | |
| S-BSM36 | Ohara | 1.642495 | 58.369399 | |
| S-BSM93 | Ohara | 1.640998 | 56.927542 | |
| BSM93 | Ohara | 1.640998 | 56.927542 | |
| LAC7 | Hoya | 1.6516 | 58.4 | |
| H-LAK50A | CDGM | 1.6516 | 58.403057 | |
| LACL1 | Hoya | 1.640851 | 56.835319 |