NBF1 by Hoya
Standard
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) | 1.7433 |
|---|---|
| Abbe Number (Vd) | 49.22 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.36501 — 1.5296 µm |
$$n(\lambda) = \sqrt{2.97535 - 0.0146135\,\lambda^2 + 0.0210964\,\lambda^{-2} + 0.00119804\,\lambda^{-4} - 0.000118874\,\lambda^{-6} + 7.34444 \times 10^{-6}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 5.3 |
|---|---|
| TCE 100/300°C (10-6/K) | 6.8 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[1.08987 \times 10^{-5} + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 23\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 4.17 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 4 |
| Acid Resistance | 4 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Notes
General glass Type
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| H-LAF53 | CDGM | 1.7433 | 49.221808 | |
| LAFN5 | Sumita | 1.743 | 49.2 | |
| K-LaFn5 | Sumita | 1.743 | 49.2 | |
| L-LAM60 | Ohara | 1.743198 | 49.295578 | |
| LAM60 | Ohara | 1.743198 | 49.309053 | |
| D-LAF53 | CDGM | 1.7433 | 49.325949 | |
| S-LAM60 | Ohara | 1.743198 | 49.339444 | |
| D-LAF53-25 | CDGM | 1.7421 | 49.246024 | |
| N-LAF35 | Schott | 1.7433 | 49.4 | |
| LAFN7 | Sumita | 1.735 | 49.5 |