Plano-Concave lens bends parallel light to diverge from one another on the output side of the lens and has a negative focal length. The negative focal length and negative spherical aberration makes such lens ideal for beam expanding or focus extension. These lenses are available uncoated or with a variety of antireflection coatings optimized in the VIS (400~700nm)；NIR (650~1050nm) and SWIR(1000~1650nm). Also we can design and produce according to the needs of customers.
| Material | Optical glasses, Fused Silica. Corning 7980. CaF2. Silicon. Germanlum. BaF2.ZnSe |
| Dimension Range | 2-1000mm |
| Dimension tolerance | +/-0.01-+/-0.2mm |
| Thickness tolerance | +/-0.01-+/-0.2mm |
| Focal Length tolerance | +/-1% |
| Surface quality | 10-5-80-50 |
| Surface Figure | λ20-λ |
| Clear Aperture | >90% |
| Centration | 10”~ 5’ |
| Chamfer | C 0.3mm@45 degree |
| Coating | AR coating. Reflection coating. Splitter coating etc. |
| * Remark：Customized is available | |
