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Spheric Lenses
Lens is a curved piece of ground and polished or molded material, usual glass, used for the refraction of light. It always consist of one or more pieces of optical glass with surfaces curved (always spherical) that they serve to converge or diverge the transmitted rays from an object, thus forming a real or virtual image of that object. The application range from the simple collection of the scanning of laser beams to precise imaging and image transfer. Lenses are classified as singlet lenses, cylindrical lenses and achromatic lenses according to their different applications.
WITOPTICS provides five kinds of 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 reduction 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 lens has a positive or negative focal length, it forms a real or virtual image of objects.
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| Plano Convex Lens | Plano Concave Lens | Double Convex Lens |
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| Double Concave Lens | Positive Meniscus Lens | Negative Meniscus Lens |
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Attribute
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Specification
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Material
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N-BK7, H-K9L, Fused Silica, N-SF10, Silicon, CaF2, Sapphire etc.
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Typical Diameter (Фmm)
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10.0, 12.7, 15.0, 20.0, 25.4, 30.0, 50.8, etc.
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Diameter Tolerance (mm)
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+0.0/-0.2 (General), +0.0/-0.02 (High Precision)
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Paraxial Focal Length Tolerance (mm)
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±2%
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Centration
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<3 arc min
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Clear Aperture
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>80% (Small Size), >95% (Large Size)
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Surface Figure (per 25mm@632.8nm)
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<1.5λ, (General), <λ/4 (High Precision)
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IRR ( @632.8nm)
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<λ/4 (General), <λ/10 (High Precision)
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Surface Quality
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60/40 (General), 10/5 (High Precision)
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Bevel (face width x 450)
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<0.25mm
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Coating
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uncoated, AR, HR, PR Coating, etc.
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Note for Spherical Lens:
(1). Other optical glass materials from Schott or Chinese CDGM are also available upon request.
(2). Custom-made Spherical 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.