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Optical Ball lens are highly transparent spheres made of optical glasses.They are used as fiber interconnects in telecom and expanded beam connectors. Sapphire ball lens, Sapphire half-ball lens and Ruby glass ball lens are both made from (Aluminium Oxide) Al203. Ruby or Ruby-Doped sapphire owes its red color to traces of chromium oxide (chromium content for ruby balls is typically >0.5%). While their physical and chemical properties are basically the same, their optical properties are somewhat different. Sapphire has superior optical transmission qualities. Ruby optical glass Ball lens are easier to see and therefore easier to handle for physical applications. 

Schott N-BK7 glass Ball Lenses are glass spheres commonly used in fiber optic applications. Large ball lenses have been successfully used as collectors in LED lighting systems and medical devices.They have high coupling efficiency and should be much easier to align than traditional lenses due to its physical shape.
Schott BK7 Half-ball lens or fused silica half ball lens,optical hemispherical lens is ideal for applications such as fiber communication,endoscopy,microscopy,optical pick-up devices and laser interferometry and measurement.

Larger optical ball lens is easier to handle and ease the sensitivity of translational alignment. However, smaller spheres or mini ball lens fits into smaller packages. 

                                  Half-ball Lens

Specification of our glass hemisphere ball lens (Half-ball lens):
*Material: Schott N-BK7 glass ball lens or Schott BK7 half ball lens,Fused silica ball lens and fused silica half ball lens,optical crystal materials, Sapphire glass ball lens and Sapphire half-ball lens, Ruby ball lens and Half-ball lens. 
*Diameter:1 mm mini ball lens and half-ball lens - 40 mm diameter Sapphire glass ball lens.  
*Dimension Tolerance:+/-0.005 mm  
*Surface Quality:40-20  
*Sphericity: 0.005 mm
*Coating:Uncoated