The double concave lens is an optical lens with concave surfaces on both sides. It is mainly used for beam divergence, virtual image generation, and optical system aberration compensation. Due to its negative focal length characteristic, it plays a crucial role in laser beam expansion, virtual reality, and lighting design.
Efficient beam divergence: Symmetrical divergence.
Multifunctional optical control: Virtual image generation.
Material compatibility with coating: A wide range of material and coating options are available.
| 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° |
