A plano-concave lens is made by machining a plane and a concave sphere.The plano-concave lens has a negative focal length and can diverge collimated beams.In this case, the surface of the lens should be oriented towards the light source to minimize spherical aberration.In addition, they compensate for the spherical aberration caused by other lenses in the optical system.
Basic Technical Parameters
Tolerance of Dimension: ±0.05mm
Surface Accuracy: 1/2λ，λ/4 per φ25.4mm
Surface Quality: 60-40, 40-20, 20-10，10-5
Clear Aperture： >90%
Polish： High-precision Polish on Both Surfaces
Plano-concave lens is often used to expand beam, project and enlarge focal length of optical system