LAF11A by Schott
Obsolete
Unknown
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) | 1.756927 |
|---|---|
| Abbe Number (Vd) | 31.702906 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.334 — 2.325 µm |
$$n(\lambda) = \sqrt{1 + \frac{1.66891\,\lambda^2}{\lambda^2 - 0.011387} + \frac{0.311963\,\lambda^2}{\lambda^2 - 0.0500311} + \frac{0.976839\,\lambda^2}{\lambda^2 - 87.3247}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 5.5 |
|---|---|
| TCE 100/300°C (10-6/K) | 6.6 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[9.2 \times 10^{-6} + 2(1.49 \times 10^{-8})\,\Delta T + 3(-2.96 \times 10^{-11})\,\Delta T^2 + \frac{1.1 \times 10^{-6} + 2(7.67 \times 10^{-10})\,\Delta T}{\lambda - 0.263}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.6 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | — |
|---|---|
| Stain Resistance | — |
| Acid Resistance | — |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Notes
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Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| LAFN12 | Sumita | 1.7569 | 31.7 | |
| NBFD9 | Hoya | 1.756898 | 31.798532 | |
| KZFS50 | Sumita | 1.74 | 31.7 | |
| BPH50 | Ohara | 1.739997 | 31.710001 | |
| ADF505 | Hoya | 1.739996 | 31.655919 | |
| S-NBH53 | Ohara | 1.737999 | 32.261312 | |
| H-TF29 | CDGM | 1.77047 | 29.806014 | |
| S-NBH53V | Ohara | 1.737999 | 32.32659 | |
| NBFD29 | Hoya | 1.77047 | 29.74 | |
| H-LAF4GT | CDGM | 1.7495 | 34.989266 |