Spheric Lens
We 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.
Plano-convex lens has a positive focal length, which makes it ideal for collecting and focusing light for many imaging applications.
Plano-concave lens has a negative focal length and is used for image reductinon or to spread light.
Double-convex lens has a positive focal length and is useful for 1:1 imaging and in multielement systems. also known as biconvex or equiconvex.
Double-concave lens has a negative focal length and is useful for 1:1 imaging and in multielement systems. also known as biconcave or equiconcave.
Meniscus lense has a positive or negative focal length, it forms a real or virtual image of objects.
Specifications of Spheric Lens
Attribute | Specification |
Material | N-BK7, H-K9L, Fused Silica, N-SF10, Silicon, CaF2, Sapphire etc. |
Typical Diameter (Фmm) | 10.0, 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. |
Note for Spheric Lens:
(1). Other optical glass materials from Schott or Chinese CDGM are also available upon request.
(2). Custom-made Spheric Lenses at any size from diameter 2.0mm to 300mm are available upon request.
(3). Typical paraxial focal length tolerance is ±2%, better tolerance is available upon request
(4). Typical centration is 3 arc minutes, better precision is available upon request.
(5). Besides uncoated, Lenses with Anti-Reflective(AR), High-Reflective(HR), Partial-Reflective(PR) coating are available upon request, Please refer to Part 4 OPTICAL COATING for more information about coating.