Biconcave Lens 50mm Diameter −69.5mm Focal Length 750 - 1550nm

SLB-50B-70NIR2

These biconcave lenses are used when a very high negative power is required. They can be used in a multi-element system or alone to produce a diverging cone or virtual image. Sharpe edges, which are common in negative lenses, are removed by beveling to reduce the likelihood of chipping.
◦There are two types of biconvex lenses available; BK7 for use in visible range to infrared wavelength range.
◦Our lenses are listed by outside diameter and focal length to assist your selection according to required specifications.
More Information
Name Biconcave Lens 50mm Diameter −69.5mm Focal Length 750 - 1550nm
Weight 0.0500kgs
Standard Coatings Available No
Diameter φD 50mm
Focal length −69.5mm
Material BK7
Design Wavelength 546.1nm
Refractive index n<sub>e</sub> 1.519
Coating Broadband Multilayer antireflection coating (750 - 1550nm)
Transmmittance > Average 98.5%
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 750 - 1550nm
Diameter φD φ50mm
Focal length f −69.5mm
Edge thickness te 11.9mm
Center thickness tc 3mm
Back focal length fb −70.5mm
Radius of curvature r 72.66mm
Centration <1′
In stock
SKU
SLB-50B-70NIR2
$143.82

Delivery in : 2 weeks

These biconcave lenses are used when a very high negative power is required. They can be used in a multi-element system or alone to produce a diverging cone or virtual image. Sharpe edges, which are common in negative lenses, are removed by beveling to reduce the likelihood of chipping.

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