LAK12 by Sumita
Obsolete
Very Rare
Environmentally Dangerous
LAK12 by Sumita is an obsolete optical glass with a very rare melt frequency. It transmits from 0.31 to 2.00 µm with an nd of 1.6779 and a Vd of 55.5. It has good chemical resistance and dangerous environmental properties.
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) | 1.6779 |
|---|---|
| Abbe Number (Vd) | 55.5 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{2.76242 - 0.0107204\,\lambda^2 + 0.0192796\,\lambda^{-2} - 3.73772 \times 10^{-5}\,\lambda^{-4} + 5.44391 \times 10^{-5}\,\lambda^{-6} - 2.80359 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 3 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| H-LAK5A | CDGM | 1.6779 | 55.51497 | |
| LAC12 | Hoya | 1.6779 | 55.52 | |
| C78-56 | Corning | 1.678004 | 55.519168 | |
| S-LAL12Q | Ohara | 1.6779 | 55.346888 | |
| S-LAL12 | Ohara | 1.6779 | 55.341195 | |
| LAL12 | Ohara | 1.6779 | 55.337587 | |
| N-LAK12 | Schott | 1.6779 | 55.2 | |
| LAKN12 | Schott | 1.6779 | 55.199566 | |
| LAKL12 | Schott | 1.6779 | 54.92 | |
| D-LAK5 | CDGM | 1.6779 | 54.889665 |