M-NBFD83 by Hoya
Obsolete
Unknown
Precision Molding
Environmentally Friendly
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) | 1.820268 |
|---|---|
| Abbe Number (Vd) | 29.696286 |
| Dispersion Formula | Schott |
| Wavelength Range | 0.25 — 1.55 µm |
$$n(\lambda) = \sqrt{3.19076 - 0.0140288\,\lambda^2 + 0.0380365\,\lambda^{-2} + 0.00231116\,\lambda^{-4} - 0.000142447\,\lambda^{-6} + 1.92207 \times 10^{-5}\,\lambda^{-8}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 8.1 |
|---|---|
| TCE 100/300°C (10-6/K) | — |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[0 + 2(0)\,\Delta T + 3(0)\,\Delta T^2 + \frac{0 + 2(0)\,\Delta T}{\lambda - 0}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 3.52 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | 2 |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| E37-30 | Corning | 1.836406 | 30.205692 | |
| LASF32 | Schott | 1.803493 | 30.397148 | |
| S-NBH55 | Ohara | 1.799999 | 29.844688 | |
| LAF9 | Schott | 1.79504 | 28.393185 | |
| H-ZLAF56B | CDGM | 1.8061 | 33.268324 | |
| H-ZLAF76A | CDGM | 1.85013 | 30.012319 | |
| H-ZLAF76 | CDGM | 1.85013 | 30.055517 | |
| S-NBH57 | Ohara | 1.850249 | 30.046429 | |
| IRG3 | Generic IR | 1.844836 | 32.330322 | |
| K-PSFn185(M) | Sumita | 1.84524 | 27.1 |