LAF20 by Hoya
Obsolete
Unknown
Environmentally Dangerous
Refractive Index vs Wavelength
Refractive Index Calculator
dn/dλ vs Wavelength
dn/dλ Calculator
Abbe Number Calculator
Transmission vs Wavelength
No transmission data available.
Optical Properties
| Refractive Index (nd) | 1.744 |
|---|---|
| Abbe Number (Vd) | 44.872914 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.334 — 2.325 µm |
$$n(\lambda) = \sqrt{2.96697 - 0.0119415\,\lambda^2 + 0.0260588\,\lambda^{-2} + 0.000257719\,\lambda^{-4} + 4.51579 \times 10^{-5}\,\lambda^{-6} - 7.64617 \times 10^{-7}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | — |
|---|---|
| TCE 100/300°C (10-6/K) | — |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 25\,°\text{C}$$
Physical Properties
| Density (g/cm³) | — |
|---|---|
| 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 | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| N-LAF2 | Schott | 1.74397 | 44.85 | |
| K-LaF2 | Sumita | 1.744 | 44.9 | |
| LAF2 | Sumita | 1.744 | 44.9 | |
| H-LAF3B | CDGM | 1.744 | 44.900027 | |
| D44-45 | Corning | 1.744001 | 44.818533 | |
| LAM2 | Ohara | 1.743997 | 44.787528 | |
| S-LAM2 | Ohara | 1.743997 | 44.786431 | |
| LAF2 | Schott | 1.744002 | 44.719972 | |
| K-VC174(M) | Sumita | 1.74578 | 45.1 | |
| K-VC174 | Sumita | 1.7485 | 45.3 |