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Ball Lenses

  • Broad diameter range: 0.3mm to 100mm
  • Substrates of sapphire, ruby, BK7, Fused Silica, high index glass, and Ge, ZnSe, ZnS
  • AR coating available
  • Applications: fiber coupling, endoscopy, bar code scanning and sensors
Inquire for custom product  
Code Types Material Diameter EFL Coating Unit Price Delivery Cart
1105-001 Ball N-BK7 1.0mm 0.73mm None $5.5 2~3 Days
1105-002 Ball UV Fused Silica 1.0mm 0.80mm None $8.5 2~3 Days
1105-003 Ball Sapphire 1.0mm 0.57mm None $10.0 2~3 Days
1105-004 Ball N-BK7 2.0mm 1.47mm None $5.5 2~3 Days
1105-005 Ball UV Fused Silica 2.0mm 1.59mm None $8.5 2~3 Days
1105-006 Ball Sapphire 2.0mm 1.15mm None $10.0 2~3 Days
1105-007 Ball N-BK7 3.0mm 2.20mm None $5.5 2~3 Days
1105-008 Ball UV Fused Silica 3.0mm 2.39mm None $8.5 2~3 Days
1105-009 Ball Sapphire 3.0mm 1.72mm None $10.0 2~3 Days
1105-010 Ball N-BK7 4.0mm 2.93mm None $5.5 2~3 Days
1105-011 Ball UV Fused Silica 4.0mm 3.18mm None Inquiry Inquiry
1105-012 Ball Sapphire 4.0mm 2.30mm None $12.0 2~3 Days
1105-013 Ball N-BK7 5.0mm 3.67mm None $5.5 2~3 Days
1105-014 Ball UV Fused Silica 5.0mm 3.98mm None $10.0 2~3 Days
1105-015 Ball Sapphire 5.0mm 2.87mm None $12.0 2~3 Days
1105-016 Ball N-BK7 6.0mm 4.40mm None $7.5 2~3 Days
1105-017 Ball UV Fused Silica 6.0mm 4.78mm None $10.0 2~3 Days
1105-018 Ball Sapphire 6.0mm 3.45mm None $15.0 2~3 Days
1105-019 Ball N-BK7 7.0mm 5.14mm None $7.5 2~3 Days
1105-020 Ball UV Fused Silica 7.0mm 5.57mm None $10.0 2~3 Days
1105-021 Ball Sapphire 7.0mm 4.02mm None Inquiry Inquiry
1105-022 Ball N-BK7 8.0mm 5.87mm None $7.5 2~3 Days
1105-023 Ball UV Fused Silica 8.0mm 6.37mm None $12.0 2~3 Days
1105-024 Ball Sapphire 8.0mm 4.60mm None $18.5 2~3 Days
1105-025 Ball N-BK7 9.0mm 6.61mm None $7.5 2~3 Days
1105-026 Ball UV Fused Silica 9.0mm 7.16mm None $12.0 2~3 Days
1105-027 Ball Sapphire 9.0mm 5.17mm None $20.0 2~3 Days
1105-028 Ball N-BK7 10.0mm 7.34mm None $7.5 2~3 Days
1105-029 Ball UV Fused Silica 10.0mm 7.96mm None $12.0 2~3 Days
1105-030 Ball Sapphire 10.0mm 5.75mm None $23.0 2~3 Days

Ball lenses belong to a special form of biconvex lenses which have the geometry of a ball(sphere). They are  manufactured from a single material, usually an optical glass with good transparency in the wavelength region of interest. The typical applications of ball lenses include focusing light in the field of fibers(e.g. laser to fiber coupling ,fiber to fiber coupling), emitters and detectors , majorly to collimate light depending on geometries of the input light sourceAlso they could be ball pre-forms of aspheric lenses where they are purposefully deformed in order to prevent spherical aberrations.

Half-Ball lenses are variants of ball lenses, obtained by simply cutting the ball lenses in half.Due to ease of mounting brought by the one flat surface,they are ideal for applications where more compact designs are required , such as fiber communication, endoscopy, microscopy, optical pick-up devices, and laser measurement systems.

There are three essential parameters of ball lenses an half-ball lenses.One is effective focal length (EFL),which is the distance between a plane through the center of the lens and the beam waist (focus) of an initially collimated input beam.Another is back focal length (BFL), defined as the distance of the focal point from the lens surface, therefore half the diameter smaller than the EFL.The calculation equations OF EFL and BFL are given in the technical images,please check the technical images if your are interested.And the last is numerical aperture (NA) ,for collimated incident light, the numerical aperture (NA) of the ball lens is dependent on the size of the ball lens (D), its index of refraction (n), and the diameter of the input source (d). Simply put, numerical aperture is proportionate to the resolution of the lens, the larger the NA,the more the light collected by the lens. And the equation is also given in the technical image.

Hangzhou Shalom EO provides both stocked and custom ball lenses and half ball lenses made from N-BK7, UV fused silica, Sapphire and high index optical glass materials.The specification of custom ball and half ball lenses could be varied upon your request. 

There are some typical features of N-BK7, UV fused Silica and Sapphire:

  • N-BK7:  N-BK7 is a very pure and Standard glass types used to produce high-quality optics, mainly for the visible spectrum. It is one of the most frequently used optical glass,This relatively hard and stable borosilicate crown material possesses high purity and quality with very few inclusions and is almost free of bubbles.The high quality of material of lN-BK7 glass is a primary technical reason why it is the optimized choice for optical applications. Other features of N-BK7 which are advantageous for optical usage include smooth transmission and low absorption in the entire visible wavelength range.It is worth noting that under normal conditions N-BK7 has a more instable polishing and is softer than FS,  and additionally N-BK7 has higher losses through higher absorption and scattering and therefore are relatively less suitable for high power applications.
  • UV Grade Fused Silica: UV Grade Fused Silica is a synthetic ( manufactured synthetically through the oxidation of high purity silicon by flame hydrolysis) amorphous silicon dioxide consists of extremely pure raw ingredients,with maximum transmission wavelength band from 195 to 2100 nm ,which locates in the ultraviolet region. The low coefficients of thermal expansion contributes to the high thermal stability and resistance to thermal shocks, and the material also features high chemical resistance and minimal fluorescence.It is often a preferred material for precision optics due to its consistent and repeatable optical performance.

  • Sapphire: Optcial grade Sapphire,chemically composed as aluminum oxide (Al2O3) with mono crystalline structure, is used in transmission range from 0.2 - 5.5μm,which is a fairly wide range, and is particularly suitable for MWIR 3-5μmthermal imaging applications.

    Sapphire belongs to the trigonal crystal system and has a hexagonal structure.The lattice constant is a=b=4.758A, c=12.991A,Refractive index 1.762-1.770, Birefringence: 0.008~0.010.The melting temperature of sapphire is extremely high ,2030 °C,which enables sapphire to be engaged in manifolds of specially applied working conditions,high temperature applications, and applications requiring high melting points.

    Sapphire lenses are made from single crystal sapphire, they are ideal for high demanding applications because of their outstanding performance, consisting of superior surface hardness ( 9 on the Mohs scale ,the third hardest mineral, after diamond at 10 and moissanite at 9.5, which means high resistance to scratch and abrasion ), high thermal conductivity, high dielectric constant and resistance to common chemical acids and alkalis. Additionally, sapphire features a high index of refraction and excellent broadband transmission characteristics.


9.0mm Diameter N-BK7 Ball Lens

9.0mm Diameter N-BK7 Ball Lens

4.0mm Diameter N-BK7 Ball Lens

4.0mm Diameter N-BK7 Ball Lens

7.0mm Diameter N-BK7 Ball Lens

7.0mm Diameter N-BK7 Ball Lens