Plano-concave lenses are designed for parallel light to be incident to the concave surface. Plano-concave lenses have a broad range of applications including focusing and control of laser beams, moderate quality imaging and other optical instruments. In a multi-element optical system, the lenses reduce the power of the system. Used on their own, the lenses form a diverging cone or virtual image. A typical use for concave lenses would be in a beam expander.
Custom capabilities:
| Substrate | N-BK7, H-K9L, Fused silica glasses, JGS1, N-SF11, IR optical glasses, etc. |
| Diameter range | 3mm to 500mm |
| Tolerance | +/-0.05mm |
| Thickness tolerance | +/-0.05mm |
| Surface quality | 40/20 or better |
| Surface accuracy | L/4 |
| Centering | 1 arc min |
| Chamfer | protective chamfer |
| Coating | AR coating or reflective miror coating @ different wavelengths |
