Spheric Lens

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.

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.

Attribute	Specification
Material	BK7, K9, Fused Silica, 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 dlameter 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 avallable upon request

(5). Besides uncoated, Lenses with Anti-Reflective(AR), High-Retflective(HR), Partial-Reflective(PR) coating

are available upon request, Please refer to Part 5 OPTICAL COATING for more information about coating.

Mass Production: 1 Million Pieces Per Month

Medium/Small Batch Production: 100K Pieces Per Month

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