H-BAK8 by CDGM
Preferred
Medium
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) | 1.5725 |
|---|---|
| Abbe Number (Vd) | 57.486797 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.302 — 2.325 µm |
$$n(\lambda) = \sqrt{1 + \frac{0.845102\,\lambda^2}{\lambda^2 - 100.298} + \frac{1.01452\,\lambda^2}{\lambda^2 - 0.00555242} + \frac{0.418518\,\lambda^2}{\lambda^2 - 0.0202281}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 7.4 |
|---|---|
| TCE 100/300°C (10-6/K) | 8.9 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[-3.83 \times 10^{-7} + 2(1.55 \times 10^{-8})\,\Delta T + 3(-1.57 \times 10^{-11})\,\Delta T^2 + \frac{5.02 \times 10^{-7} + 2(3.65 \times 10^{-10})\,\Delta T}{\lambda - 0.199}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 3.18 |
|---|---|
| Relative Cost | 2.5 |
Mechanical Properties
| Young's Modulus (GPa) | 73.78 |
|---|---|
| Poisson's Ratio | 0.241 |
| Knoop Hardness (kgf/mm²) | 530.0 |
Chemical Resistance
| Climatic Resistance | 2 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | — |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| BAC1 | Hoya | 1.572497 | 57.488684 | |
| B72-57 | Corning | 1.572498 | 57.494511 | |
| BAK1 | Sumita | 1.5725 | 57.5 | |
| BAK1 | Schott | 1.5725 | 57.54931 | |
| N-BAK1 | Schott | 1.5725 | 57.55 | |
| S-BAL11 | Ohara | 1.572501 | 57.74298 | |
| BAL11 | Ohara | 1.572501 | 57.760854 | |
| BAK50 | Schott | 1.567736 | 57.990411 | |
| BAC6 | Hoya | 1.574441 | 56.357089 | |
| S-BAL14 | Ohara | 1.568832 | 56.363897 |
Similar Glasses (CDGM)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| H-BAK7A | CDGM | 1.568828 | 56.127804 | |
| H-BAK7GT | CDGM | 1.56883 | 56.041308 | |
| H-BAK7 | CDGM | 1.56883 | 56.041308 | |
| H-BAK5 | CDGM | 1.56069 | 58.344731 | |
| D-ZK2-25 | CDGM | 1.58241 | 59.308255 | |
| D-ZK2A-25 | CDGM | 1.58229 | 59.453631 | |
| D-ZK2 | CDGM | 1.58313 | 59.381686 | |
| H-ZK2 | CDGM | 1.58313 | 59.460082 | |
| D-ZK2A | CDGM | 1.58313 | 59.539751 | |
| D-ZK2L-25 | CDGM | 1.58625 | 59.524868 |