K-LaSFn21 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) | 1.85 |
|---|---|
| Abbe Number (Vd) | 32.4 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.4 — 1.55 µm |
$$n(\lambda) = \sqrt{3.30403 - 0.0160197\,\lambda^2 + 0.037646\,\lambda^{-2} + 0.00215325\,\lambda^{-4} - 0.000204981\,\lambda^{-6} + 2.76232 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 6.0 |
|---|---|
| TCE 100/300°C (10-6/K) | 7.6 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[3.35 \times 10^{-6} + 2(1.38 \times 10^{-8})\,\Delta T + 3(-2.07 \times 10^{-11})\,\Delta T^2 + \frac{8.23 \times 10^{-7} + 2(1.31 \times 10^{-9})\,\Delta T}{\lambda - 0.268}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 3.99 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 3 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| H-ZLAF71 | CDGM | 1.85026 | 32.297288 | |
| LAH71 | Ohara | 1.850259 | 32.28594 | |
| S-LAH71 | Ohara | 1.850259 | 32.27012 | |
| H-ZLAF71AGT | CDGM | 1.85026 | 32.216801 | |
| TAFD9 | Hoya | 1.850299 | 32.181026 | |
| N-LASF9 | Schott | 1.85025 | 32.17 | |
| LASFN9 | Schott | 1.85025 | 32.17 | |
| N-LASF9HT | Schott | 1.85025 | 32.17 | |
| IRG3 | Generic IR | 1.844836 | 32.330322 | |
| H-ZLAF76 | CDGM | 1.85013 | 30.055517 |
Similar Glasses (Sumita)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| LASFN21 | Sumita | 1.85 | 32.4 | |
| K-GIR79 | Sumita | 1.8592 | 33.0 | |
| K-VC91(M) | Sumita | 1.88175 | 34.9 | |
| LASFN14 | Sumita | 1.834 | 37.2 | |
| K-PSFn185(M) | Sumita | 1.84524 | 27.1 | |
| K-LaSFn14 | Sumita | 1.834 | 37.3 | |
| K-PSFn185 | Sumita | 1.8507 | 26.9 | |
| K-VC91 | Sumita | 1.8866 | 35.0 | |
| K-VC90(M) | Sumita | 1.84859 | 38.9 | |
| K-VC90 | Sumita | 1.8528 | 39.0 |