Double-concave lens
Double-concave lens is an optical lens with two inward-curved (spherical) surfaces, designed to diverge incident light. Compared to a plano-concave lens, it provides stronger beam divergence due to its symmetrical concave structure, making it suitable for applications requiring significant light spreading.
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Parameter List:
| Material： | K9,BK7,Fused Silica,Caf2,MgF2,... |
| Diameter: | 1/12.7/25.4/Customized |
| Dia Tolerance: | ±0.01/±0.05/±0.1*/Customized |
| Center Thickness: | 0.1/0.2/0.5/Customized |
| Edge Thickness: | 0.1/0.2/0.5/Customized |
| Focal Length: | 12.5/25.4/50.8/100/Customized |
| Centering: | ±3arcmin/Customized |
| Surface Quality: | 10/5,20/10,40/20,60/40 |
| Clear Aperture: | ＞90% |
| Coating: | AR/BBAR@any wavelength range |
| Bevel: | Protective bevel as needed |
| Surface Accuracy: | 1/10,1/8,1/4,1/2λ |
Strongly diverges parallel light, ideal for beam expansion or optical path adjustment.
Frequently combined with convex lenses (e.g., double-convex lenses) to compensate for aberrations (e.g., chromatic or spherical aberrations).
Applications: Laser beam expanders, imaging systems, telescopes, microscopes, and VR optical assemblies.
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