NBFD7 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) | 1.782999 |
|---|---|
| Abbe Number (Vd) | 36.06621 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.334 — 2.325 µm |
$$n(\lambda) = \sqrt{3.08983 - 0.0173768\,\lambda^2 + 0.0271242\,\lambda^{-2} + 0.00244389\,\lambda^{-4} - 0.000205588\,\lambda^{-6} + 1.6662 \times 10^{-5}\,\lambda^{-8}}$$
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 | |
|---|---|---|---|---|
| H-LAF7 | CDGM | 1.78179 | 37.092107 | |
| LAF22A | Schott | 1.781791 | 37.196288 | |
| S-LAM73 | Ohara | 1.7936 | 37.08945 | |
| LAF13 | Schott | 1.775507 | 37.836043 | |
| LASF36A | Schott | 1.797117 | 35.080117 | |
| S-NBH59 | Ohara | 1.766342 | 35.82343 | |
| S-LAM66 | Ohara | 1.800999 | 34.967403 | |
| H-ZLAF66GT | CDGM | 1.801 | 34.966919 | |
| H-ZLAF66 | CDGM | 1.801 | 34.966919 | |
| LAM66 | Ohara | 1.800999 | 34.965762 |
Similar Glasses (Hoya)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| NBFD8 | Hoya | 1.807401 | 35.542096 | |
| NBFD6 | Hoya | 1.756702 | 36.345258 | |
| NBFD15 | Hoya | 1.8061 | 33.27 | |
| NBFD15-W | Hoya | 1.8061 | 33.27 | |
| M-NBFD82 | Hoya | 1.814741 | 37.027807 | |
| NBFD3 | Hoya | 1.8045 | 39.64 | |
| LAF7 | Hoya | 1.749497 | 35.042695 | |
| E-LAF7 | Hoya | 1.7495 | 35.04 | |
| NBFD5 | Hoya | 1.762001 | 40.263213 | |
| NBFD2 | Hoya | 1.797199 | 41.143795 |