Biconcave Lens
Biconcave lenses are similar to plano-concave lenses and can be divided into non-coated and anti-reflective multilayer lenses coated with visible light bands. It has a negative focal length and is used to diverge a beam of parallel light. However, the parallel incident light diverges outward, and the two side surfaces of the biconcave lens have the same radius of curvature, which is generally used for beam expansion and projection systems to increase the focal length.
Product Code:GA-BCL2
Specification
| Material | K9, Optical glass, UV quartz |
| Focal length | ±2%@587.6nm |
| Dimensional tolerance | -0.05~0.1 mm |
| Center thickness tolerance | ±0.03~0.1mm |
| Center deviation | 30“-3‘ |
| Aperture | 1-5 |
| Partial aperture | 0.2-0.5 |
| Surface finish | 60-40， 40-20 |
| Clear aperture | >90% |
| Coating | AR coating |
