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title: Catalog RFQ Simple Ball Lenses
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[![Ross Optical](https://custom-optics.rossoptical.com/hs-fs/hubfs/Ross-POCI-Logo-Horizontal.png?width=200&height=86&name=Ross-POCI-Logo-Horizontal.png "Ross Optical")](https://www.rossoptical.com)

# Ball Lenses

Ball lenses are highly transparent spheres made of optical glasses. They are used to focus light into fibers as in diode laser-to-fiber coupling as well as fiber-to-fiber coupling. They have high coupling efficiency and should be much easier to align than traditional lenses due to their physical shape.

** Please note, dimensional units are as follows:  
Diameter mm  
Sphericity Tolerance: Microns (µm)  
Diameter Tolerance: Microns (µm)*