H-BAK4 by CDGM
Preferred
Rare
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) | 1.55248 |
|---|---|
| Abbe Number (Vd) | 63.36549 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.302 — 2.325 µm |
$$n(\lambda) = \sqrt{1 + \frac{0.559279\,\lambda^2}{\lambda^2 - 0.00172756} + \frac{0.985286\,\lambda^2}{\lambda^2 - 97.8673} + \frac{0.818059\,\lambda^2}{\lambda^2 - 0.013593}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 6.1 |
|---|---|
| TCE 100/300°C (10-6/K) | 7.6 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[9.33 \times 10^{-7} + 2(2.01 \times 10^{-8})\,\Delta T + 3(-2.04 \times 10^{-11})\,\Delta T^2 + \frac{3.94 \times 10^{-7} + 2(2.14 \times 10^{-10})\,\Delta T}{\lambda - 0.158}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Physical Properties
| Density (g/cm³) | 2.9 |
|---|---|
| Relative Cost | 2.9 |
Mechanical Properties
| Young's Modulus (GPa) | 82.77 |
|---|---|
| Poisson's Ratio | 0.228 |
| Knoop Hardness (kgf/mm²) | 550.0 |
Chemical Resistance
| Climatic Resistance | 2 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | — |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| PCD3 | Hoya | 1.55232 | 63.424095 | |
| PSK3 | Schott | 1.552322 | 63.456253 | |
| N-PSK3 | Schott | 1.55232 | 63.46 | |
| L-PHL2 | Ohara | 1.5588 | 62.558541 | |
| K-PG375 | Sumita | 1.5425 | 62.9 | |
| K-PG375(M) | Sumita | 1.53922 | 62.7 | |
| BBO-E | Generic Birefringent | 1.552518 | 61.321496 | |
| BAL22 | Ohara | 1.568729 | 63.162358 | |
| S-BAL22 | Ohara | 1.568729 | 63.10486 | |
| PCD2 | Hoya | 1.56873 | 63.105028 |
Similar Glasses (CDGM)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| H-BAK3 | CDGM | 1.54678 | 62.776077 | |
| H-ZK1 | CDGM | 1.56888 | 62.95699 | |
| H-BAK6 | CDGM | 1.56388 | 60.764747 | |
| H-BAK2 | CDGM | 1.53996 | 59.724182 | |
| H-BAK1 | CDGM | 1.53028 | 60.466139 | |
| H-K90GTI | CDGM | 1.51948 | 63.291634 | |
| D-K59 | CDGM | 1.5176 | 63.499991 | |
| H-K11 | CDGM | 1.52638 | 60.15737 | |
| D-K59-25 | CDGM | 1.51698 | 63.4085 | |
| H-K9LAGT | CDGM | 1.5168 | 64.198695 |