BK7HT by Schott
Obsolete
Unknown
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) | 1.51633 |
|---|---|
| Abbe Number (Vd) | 64.14348 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.334 — 2.325 µm |
$$n(\lambda) = \sqrt{1 + \frac{1.03826\,\lambda^2}{\lambda^2 - 0.0060007} + \frac{0.231746\,\lambda^2}{\lambda^2 - 0.0200179} + \frac{1.00915\,\lambda^2}{\lambda^2 - 103.561}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 6.8 |
|---|---|
| TCE 100/300°C (10-6/K) | 8.1 |
| 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) | 2.5 |
|---|---|
| Relative Cost | — |
Mechanical Properties
| Young's Modulus (GPa) | — |
|---|---|
| Poisson's Ratio | — |
| Knoop Hardness (kgf/mm²) | — |
Chemical Resistance
| Climatic Resistance | 1 |
|---|---|
| Stain Resistance | — |
| Acid Resistance | 1 |
| Alkali Resistance | — |
| Phosphate Resistance | 1 |
Notes
old, High UV Transmission; glass data moved from former "I_LINE" catalog
Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| S-BSL7 | Ohara | 1.51633 | 64.142022 | |
| BSL7 | Ohara | 1.51633 | 64.150145 | |
| K-BK7 | Sumita | 1.51633 | 64.1 | |
| BK7 | Sumita | 1.51633 | 64.1 | |
| L-BSL7 | Ohara | 1.51633 | 64.065129 | |
| H-K9LA | CDGM | 1.5168 | 64.198695 | |
| H-K9LAGT | CDGM | 1.5168 | 64.198695 | |
| H-K9L* | CDGM | 1.5168 | 64.198732 | |
| H-K9L | CDGM | 1.5168 | 64.198732 | |
| H-K9LGT | CDGM | 1.5168 | 64.198732 |
Similar Glasses (Schott)
| Glass | Manufacturer | nd | Vd | |
|---|---|---|---|---|
| BK7 | Schott | 1.5168 | 64.167336 | |
| N-BK7HT | Schott | 1.5168 | 64.17 | |
| N-BK7HTi | Schott | 1.5168 | 64.17 | |
| N-BK7 | Schott | 1.5168 | 64.17 | |
| N-BK7HTSultra | Schott | 1.5168 | 64.17 | |
| P-BK7 | Schott | 1.5164 | 64.06 | |
| UBK7 | Schott | 1.516801 | 64.289727 | |
| BK8 | Schott | 1.520152 | 63.685744 | |
| BK7G18 | Schott | 1.51975 | 63.58 | |
| PK2 | Schott | 1.518211 | 65.054286 |