BK7 Windows
BK7 window is the most common type of window, it has good performance over visible and near infrared wavelength region. The refractive index is 1.5168 at 587.6nm.
| Specifications | Standard | High Precision |
|---|---|---|
| Material | BK7 Grade A Optical Glass | |
| Dimension Tolerance | +0.0/-0.2mm | +0.0/-0.02mm |
| Thickness Tolerance | +0.0/-0.2mm | +0.0/-0.05mm |
| Flatness | λ/2@632.8nm | λ/10@632.8nm |
| Surface Quality | 60-40 | 20-10 |
| Clear Aperture | >85% | >90% |
| Parallelism | 1 arc min | 10 arc sec |
| Bevel | 0.25mm x 45° | |
| Coating | Uncoated, AR, HR, PR, etc. | |
| Standard BK7 Window | |
|---|---|
| Round Shape: DiaxT(mm) | Φ10.0x3.0, Φ12.7x3.0, Φ15.0x3.0, Φ20.0x3.0, Φ25.0x3.0, Φ25.4x3.0, Φ30.0x3.0, Φ50.8x6.35 |
| Square Shape: WxHxT(mm) | 5.0x5.0x1.0, 10.0x10.0x1.0, 15.0x15.0x2.0, 20.0x20.0x2.0, 25.0x25.0x2.0, 50.0x50.0x6.0 |
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| High Precision BK7 Window | |
|---|---|
| Round Shape: DiaxT(mm) | Φ10.0x6.0, Φ12.7x6.0, Φ15.0x6.0, Φ20.0x6.0, Φ25.0x6.0, Φ25.4x6.35, Φ30.0x.6.35, Φ50.8x10.0 |
Note: Other sizes, material and coating are available upon request.
