Plano-Concave Spherical Lens has a negative focal length and is typically used to cause a collimated beam to diverge as in a Galilean type beam expander or Telescope. Because the spherical aberration of the Plano-Concave is negative, it can be used to balance the aberration of other lenses.This lens is widely use in optical display systems, projection optics systems, imaging and laser measureemnt systerms;
Specification of our plano-concave spherical lenses as follow:
Material: BK7 or other materials
Focal length: +/-1%
Center thickness tolerance: +/-0.01mm
Centration: 1 arc minutes
Surface Figure: Lambda/2 at 633nm on plano side
Surface quality: 40/20 stratch/dig
Clear Apenture> 90%
Chamfer Protective: 0.25mm at 45 degree typical
Coating: Optional
| Range of diameter | Dia.0.7mm-Dia.400mm |
| Range of curve radius | R1.5-R∞ etc. |
| Tolerance of diameter | +/-0.1, +/-0.01, +/-0.005 etc. |
| Surface accuracy | λ , 1/2λ , 1/4λ , 1/10λ etc. |
| Tolerance of Thickness | +/-0.1, +/-0.05, +/-0.01 etc. |
| Centration | +/-2′,+/-1′ etc. |
| Aperture N | 5, 1 etc. |
| Irregularity ΔN | 2, 1, 0.5, 0.2 etc. |
| Surface quality | 60/40, 40/20, 20/10, 10/5 etc. |
A-Star Optics has quickly established itself as a leader in Plano-Concave Spherical Lens from its advanced technology and quality control.