The plano-concave lens is a type of optical lens with a concave surface on one side and a flat surface on the other. It is mainly used for beam divergence, optical path expansion, and aberration compensation. Due to its negative focal length characteristic, it plays a crucial role in laser systems, optical instruments, and virtual imaging.
Efficient beam divergence and beam expansion: Negative focal length characteristics and low aberration design.
Aberration compensation capability: Correcting optical system aberrations.
Structural lightweighting and compact design: The surface can directly attach to the mechanical structure.
| Material | BK7 or Fused Silica |
| Design Wavelength | 546.1 nm |
| Diameter Tolerance | +0.00,-0.15 mm |
| Thickness Tolerance | ±0.2 mm |
| Paraxial Focal Length | ±2% |
| Centration | <3 arc minutes |
| Clear Aperture | >85% |
| Surface lrregularity | λ/4@632.8 nm |
| Surface Quality | 40-20 scratch and dig |
| Prorective Bevel | 0.25 mm x 45° |
