BK7 Optical Glass Wedge Prism
Featured Product from Changchun Yutai Optics Co., Ltd.
| Comparison of optical performance between fused silica wedge prisms and BK7(K9) wedge prisms | ||
| Parameter | UV Fused Silica | Optical Glass BK7 |
| Transmission Range | 170 nm -2.1 μm (deep UV to NIR) | 350 nm - 2.0 μm (VIS is dominant) |
| UV transmittance@200nm | >90% (Thickness=1mm) | <10% (strong absorption) |
| Refractive Index@587.6nm | 1.458 | 1.517 |
| Dispersion (νd) | 67.8 (low dispersion) | 64.2 (moderate dispersion) |
| Birefringence | No (isotropic) | No (isotropic) |
| Laser Induced Damage Threshold | Higher (suitable for high-energy ultraviolet lasers) | Relatively low (especially prone to damage in the ultraviolet band) |
When is a BK7 (K9) wedge prism the more suitable choice?
The working band is visible(400-700 nm) or near-infrared (700-2000 nm). The budget is limited and no ultraviolet or ultra-high thermal stability is required. It is used for low-power laser or ordinary optical adjustment (such as laboratory optical path calibration).
