Silicon (Si) Plano convex Lenses are made from Germanium material. They present a curvecd interface and a planar interface. They have a positive focal length, which makes it ideal for collecting and focusing light for many imaging applications. They are for instance the microlenses situated on top of a wafer, and also encountered in macroscopic optical systems.

Specifications:
Material:-----------------------------------------------------------Silicon
Diameter Tolerance:----------------------------------------------+0.0/-0.15mm
Focal Length Tolerance (mm):----------------------------------+/-2%
Centration:---------------------------------------------------------<3 arc minutes
Clear Aperture:---------------------------------------------------->85%
Surface Figure:-----------------------------------------------------<λ/4@633nm
Surface Quality:-----------------------------------------------------60/40
Protected Bevel:---------------------------------------------------<0.25mmx45deg
Coating:--------------------------------------------------------------uncoated