Plano Concave Lens 50.8mm Diameter −90mm Focal Length 400 - 700nm

SLB-50.8-90NM

Skip to the beginning of the images gallery

These simple negative lenses have many uses. Alone they form a virtual image of a distant object or collimated light source. Used in combination with other optics they reduce the power of the system. Sharp edges which are common in negative lenses are removed by beveling in order to reduce the likelihood of chipping.

Details

◦There are three types of plano concave 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	Plano Concave Lens 50.8mm Diameter −90mm 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.
Remark	-
Attention	Plano concave lenses are negative lenses that diverge collimated incident light and are primarily used in conjunction with plano convex lenses to shape beams. The plano-concave lens has chromatic aberration, 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. The plano concave lenses are designed for parallel light to be incident to the concave surface. 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. Sharpe edges are common in negative lenses are removed by beveling in order to reduce chipping may result in smaller then edge thickness. Thicknesses listed in tables are to theoretical sharp edge.
Diameter φD	50.8mm
Focal length	90mm
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	85% of the diameter
Surface Quality (Scratch-Dig)	20-10
Wavelength range of Antireflection Coating	400 - 700nm
Diameter φD	φ50.8mm
Focal length f	−90mm
Edge thickness te	10.5mm
Center thickness tc	3mm
Back focal length fb	−92.0mm
Radius of curvature r	46.71mm
Centration	＜1′

In stock

SKU

SLB-50.8-90NM

$111.00

Plano Concave Lens 50.8mm Diameter −90mm Focal Length 400 - 700nm

Resources & Downloads