LASFN19 by Sumita
Obsolete
Very Rare
Environmentally Dangerous
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) | 1.795 |
|---|---|
| Abbe Number (Vd) | 45.2 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{3.14319 - 0.014183\,\lambda^2 + 0.0263851\,\lambda^{-2} + 0.00100261\,\lambda^{-4} - 5.9284 \times 10^{-5}\,\lambda^{-6} + 4.58663 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | — |
|---|---|
| TCE 100/300°C (10-6/K) | 7.7 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.57 |
|---|---|
| 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 | |
|---|---|---|---|---|
| S-LAH67 | Ohara | 1.794997 | 45.293967 | |
| LAH67 | Ohara | 1.794997 | 45.293967 | |
| TAF2 | Hoya | 1.7945 | 45.39 | |
| N-LAF32 | Schott | 1.79457 | 45.53 | |
| E00-46 | Corning | 1.800001 | 45.608618 | |
| M-TAF31 | Hoya | 1.80139 | 45.45 | |
| MP-TAF31-15 | Hoya | 1.80154 | 45.47 | |
| MC-TAF31-15 | Hoya | 1.80154 | 45.47 | |
| D-ZLAF50-25 | CDGM | 1.80225 | 45.452746 | |
| D-ZLAF50 | CDGM | 1.80337 | 45.491557 |