BK3 by Schott
Obsolete
Unknown
Environmentally Dangerous
BK3 by Schott is an obsolete optical glass. It transmits from 0.33 to 0.85 µm with an nd of 1.498311 and a Vd of 65.063609. It has low thermal expansion (CTE of 5.3×10⁻⁶/K) and dangerous environmental properties.
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) | 1.498311 |
|---|---|
| Abbe Number (Vd) | 65.063609 |
| Dispersion Formula | Sellmeier |
| Wavelength Range | 0.334 — 2.325 µm |
$$n(\lambda) = \sqrt{1 + \frac{1.00583\,\lambda^2}{\lambda^2 - 0.00617416} + \frac{0.212096\,\lambda^2}{\lambda^2 - 0.0187793} + \frac{0.898291\,\lambda^2}{\lambda^2 - 88.8735}}$$
Thermal Properties
| TCE -30/70°C (10-6/K) | 5.3 |
|---|---|
| TCE 100/300°C (10-6/K) | 6.1 |
| Thermal Conductivity (W/mK) | — |
| Heat Capacity (J/gK) | — |
$$\frac{dn}{dT} = \frac{n_0^2 - 1}{2\,n_0}\left[6.74 \times 10^{-6} + 2(1.46 \times 10^{-8})\,\Delta T + 3(-2.37 \times 10^{-11})\,\Delta T^2 + \frac{4.51 \times 10^{-7} + 2(7.53 \times 10^{-10})\,\Delta T}{\lambda - 0.102}\right]
\Delta T = T - T_0, \quad T_0 = 20\,°\text{C}$$
Chemical Resistance
| Climatic Resistance | — |
|---|---|
| Stain Resistance | — |
| Acid Resistance | — |
| Alkali Resistance | — |
| Phosphate Resistance | — |
Notes
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Similar Glasses (Other Manufacturers)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| BK3 | Sumita | 1.49831 | 65.1 | |
| BSL3 | Ohara | 1.498308 | 65.026785 | |
| BSC3 | Hoya | 1.498309 | 65.130542 | |
| H-K3 | CDGM | 1.50463 | 64.720718 | |
| BSC4 | Hoya | 1.50048 | 65.996466 | |
| BK4 | Sumita | 1.50048 | 66.0 | |
| H-K2 | CDGM | 1.50047 | 66.020774 | |
| A88-66 | Corning | 1.487502 | 65.807152 | |
| BSL21 | Ohara | 1.503779 | 66.814545 | |
| BK10 | Sumita | 1.49782 | 67.0 |
Similar Glasses (Schott)
| Glass | Manufacturer | nd | Vd | Compare |
|---|---|---|---|---|
| N-BK10 | Schott | 1.49782 | 66.95 | |
| BK10 | Schott | 1.497821 | 66.95447 | |
| PK1 | Schott | 1.503781 | 66.921827 | |
| BK1 | Schott | 1.510091 | 63.464788 | |
| BK7HT | Schott | 1.51633 | 64.14348 | |
| UBK7 | Schott | 1.516801 | 64.289727 | |
| P-BK7 | Schott | 1.5164 | 64.06 | |
| N-BK7 | Schott | 1.5168 | 64.17 | |
| N-BK7HTSultra | Schott | 1.5168 | 64.17 | |
| N-BK7HTi | Schott | 1.5168 | 64.17 |