Plano-concave lens

 

These lenses are thicker at the edge than in the centre and flat on one side and are used to expand light beams or to increase focal lengths in optical systems. They are often employed for beam expansion of high peak power pulsed lasers. A beam incident on a concave surface will be focused to a point outside the instrument.

 

Plano-Concave Lens
Material BK7, UV FS, CaF2
Surface Flatness λ/10@632.8nm
Surface Quality 10/5
Centration Error ≤3 arc min.
Diameter Tolerance +0.0/-0.05mm
Thickness Tolerance ±0.05mm
Focal Length Tolerance ±2%
Clear Aperture >90% of diameter
Chamfer Protective
Coating Upon customer request