TO46 and TO56 Ball Lens Cap Ball lenses are commonly used for laser collimating and focusing, laser-to-fiber coupling, fiber-to-fiber coupling, Solar-photovoltaic and fiber-to-detector coupling.   Worldhawk can provide spherical ball lenses and half ball lenses in a range of substrates for performance in the ultraviolet to the NIR. Such as including H-K9L(N-BK7), Sapphire, CaF2, BaF2, ZnSe or custom materials upon request. Micro Ball  Micro Ball is precisely manufactured from optical glass. It is used as a high precision ball lens in optical communication systems and as a lens for specialty optical equipment such as endoscopes. Ball Lens Cap  Ball Lens Cap consists of a high-precision Micro Ball sealed in a can cap made of sealing alloy with glass frit. You can choose the standard type for TO-56 and TO-46, depending on the desired application. Specifications of Ball Lens (Half ball lens)    Item    Parameter (Optical glass ball lens; Half ball lens)   Material   K9 (BK7), Optical sapphire(ruby) glass, fused silica, JGS1,   ZnSe,  Zns, Ge, Caf2, b270, LaF52, Schott glass   Diameter   1~150mm, 1mm, 2mm, 3mm…   Dia. Tolerance   +/-0.002mm   Roundness   0.003-0.005   Surface Accuracy   <2λ   Irregularity   λ/2 @632.8nm   Surface Quality   <40/20 scratch/dig   Clear Aperture   >92%   Focal length tolerance   +/-1% (+/-5% for 400 series)   Centration   3 arc min or better   Coating   Upon customer request Material Specification  Glass  Materials Refractive  (nd)   Dispersion  Coefficient(vd)  Glass  Materials Refractive  (nd)   Dispersion  Coefficient(vd)   H-Zlaf90   2.00069   25.43   Sapphire   1.768   72.20   H-Zlaf50D   1.804   46.58   ZnSe   2.403   N/A   H-ZF7LA   1.80518   25.46   Silicon   3.422   N/A   Fused Silica   1.458   67.70   Germanium   4.003   N/A   H-K9L(N-BK7)   1.517   64.20         Material Characteristics Fused Silica Ball and Half-Ball Lenses: 1,Excellent UV Transmission    (From 200nm to 2.2μm) 2,Low Coefficient of Thermal Expansion Sapphire and Ruby Ball Lens(Half ball lens): 1,Excellent for Severe Environments 2,High Strength and Hardness 3,High Chemical Stability 4,Ruby Balls are easier to see H-K9L (N-BK7) Ball Lenses: 1,Can be Used as Fiber Coupling Spheres or      Collimating Lenses 2,Ideal Pre-Forms for Aspheric Lenses 3,Available in a Variety of Sizes High Index Ball Lenses: 1,Index of Refraction of 1.8-2.0 2,High Tolerance 3,High Index for a Closer Focal Distance