01 Sep 2009 FOCtek provides five kinds of spheric lens forms, or shapes, that determine the imaging Characteristics of the lenses, they are plano-convex, plano-concave ,Double-convex, Double-concave and Meniscus. Specifications of Spheric Lens
Material :K7, K9, Fused Silica, SF10, Silicon, CaF2, Sapphire etc.
Typical Diameter (Фmm):0, 12.7, 15.0, 20.0, 25.4, 30.0, 50.8, etc.
Diameter Tolerance (mm):+0.0/-0.2 (General), +0.0/-0.02 (High Precision)
Paraxial Focal Length Tolerance (mm):±2%
Centration:<3 arc min
Clear Aperture:>80% (Small Size), >95% (Large Size)
Surface Figure (per 25mm@632.8nm):<1.5λ, (General), <λ/4 (High Precision)
IRR ( @632.8nm):<λ/4 (General), <λ/10 (High Precision)
Surface Quality:60/40 (General), 10/5 (High Precision)
Bevel (face width x 450) :0.25mm
Coating:uncoated, AR, HR, PR Coating, etc.
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