OPTICS
Biconcave Lenses
SLB-B-N/SLSQ-B-N
These biconcave lenses are used when a very high negative power is required. They can be used in a multi-element system or alone to produce a diverging cone or virtual image. Sharpe edges, which are common in negative lenses, are removed by beveling to reduce the likelihood of chipping.
Optics & Optical Coatings
- There are two types of biconvex lenses available; BK7 for use in visible range to infrared wavelength range and synthetic fused silica for wavelengths less than 350nm ultraviolet light.
- Consult our Sales Division for anti-reflection coatings suitable for your application.
- Our lenses are listed by outside diameter and focal length to assist your selection according to required specifications.
Key Specifications
| Material | SLB: BK7 SLSQ: Synthetic fused silica |
| Design wavelength | 546.1nm |
| Refractive index | BK7: ne=1.519 Synthetic fused silica: ne=1.460 |
| Coating | Uncoated: the end of the part number ‘N’ Anti-reflection coating: the end of the part number ‘NM’, ‘NIR1’, ‘NIR2’ |
| Laser Damage Threshold | Anti-reflection coating: 4J/c㎡ Laser pulse with 10ns, repetition frequency 20Hz |
| Clear aperture | 90% of actual aperture: Uncoated 85% of actual aperture: with coating |
| Surface Quality (Scratch–Dig) | 20–10 |
