LF1 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) | 1.57309 |
|---|---|
| Abbe Number (Vd) | 42.7 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.27 — 2.0 µm |
$$n(\lambda) = \sqrt{2.42219 - 0.00868028\,\lambda^2 + 0.0174323\,\lambda^{-2} + 0.000619724\,\lambda^{-4} - 1.94406 \times 10^{-5}\,\lambda^{-6} + 2.7848 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | — |
|---|---|
| TCE 100/300°C (10-6/K) | 10.7 |
| 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) | 3.15 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 2 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| FL1 | Hoya | 1.573091 | 42.586108 | |
| PBL21 | Ohara | 1.573092 | 42.576094 | |
| H-QF56 | CDGM | 1.56732 | 42.810117 | |
| S-TIL26 | Ohara | 1.567322 | 42.817076 | |
| PBL26 | Ohara | 1.567322 | 42.831708 | |
| E-FL6 | Hoya | 1.56732 | 42.84 | |
| FL6 | Hoya | 1.567324 | 42.843119 | |
| LF6HT | Schott | 1.56732 | 42.847665 | |
| PBL26Y | Ohara | 1.567322 | 42.855569 | |
| FL7 | Hoya | 1.57501 | 41.509668 |