Biconvex Lens 20mm Diameter 40.7mm Focal Length 400 - 700nm

SLB-20B-40PM

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Symmetrical biconvex lenses are most useful when dealing with finite conjugate points. This makes them ideal for 1:1 imaging applications or for use in multi-element systems.

Details

◦There are two types of biconvex lenses available; BK7 for use in visible range to infrared wavelength range.
◦BK7 lenses are also available with three types of anti-reflection coatings, visible wavelength range, in the near-infrared range and in the infrared range.
◦Our lenses are listed by outside diameter and focal length to assist your selection according to required specifications.

More Information

More Information
Name	Biconvex Lens 20mm Diameter 40.7mm Focal Length 400 - 700nm
Weight	0.0500kgs
Standard Coatings Available	No
Guide	Lenses are available in a large selection and in custom sizes and focal lengths. In addition to our standard coating we offer custom anti-reflective coating at specific wavelengths. Achromatic lenses (DLB) which are chromatic aberration correction are also available. WEB Reference Catalog Code/W3075
Remark	-
Attention	The biconvex spherical lens has a chromatic aberration, and the focal length will vary depending on the wavelength. Please check the “wavelength characteristic of the focal length data” on “Technical Data” for the focal lengths of each wavelength. Biconvex spherical aberration is larger than that of the plano-convex lens, so focal spot may not gather at one point. Transmissions losses due to reflection off the front and rear surfaces of the lens can be minimized by coating the surfaces. Consult our Sales Division for anti-reflection coatings suitable for your application.
Diameter φD	20mm
Focal length	40.7mm
Material	BK7
Design Wavelength	546.1nm
Refractive index n<sub>e</sub>	1.519
Coating	Broadband Multilayer antireflection coating (400 - 700nm)
Transmmittance	> Average 99%
Laser Damage Threshold	4J/cm² (Laser pulse width ; 10ns , Repetition frequency ; 20Hz)
Clear aperture	φD≧φ10mm ; 85% of the diameter φD＜φ10mm ; 83% of the diameter
Surface Quality (Scratch-Dig)	D≧φ10mm ; 20-10 φD＜φ10mm ; 40-20
Wavelength range of Antireflection Coating	400 - 700nm
Diameter φD	φ20mm
Focal length f	40.7mm
Edge thickness te	2mm
Center thickness tc	4.4mm
Back focal length fb	39.3mm
Radius of curvature r	41.52mm
Centration	＜1′

In stock

SKU

SLB-20B-40PM

$64.00

Symmetrical biconvex lenses are most useful when dealing with finite conjugate points. This makes them ideal for 1:1 imaging applications or for use in multi-element systems.

Biconvex Lens 20mm Diameter 40.7mm Focal Length 400 - 700nm

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