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Stock and Custom Ball Lenses and Half Ball Lenses

Featured Product from Hangzhou Shalom Electro-optics Technology Co., Ltd.

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Features:

  • Broad diameter range: ~300mm (Custom), 1-10mm (Off-the-Shelf)
  • Substrate Materials: Sapphire, N-BK7, UV Fused Silica, Ruby, Ge, ZnSe, and other High-Refractive-Index Glass

  • Coating Options: None or AR Coatings

  • Applications: fiber coupling, objective lenses for endoscopes, bar code scanning, and sensors, pre-forms of Aspheric Lenses

 

Ball Lenses are a special form of biconvex lenses that inherit the geometry of a ball (which implies completely spherical surfaces), manufactured from a single material with the optical transmission sited in the wavelength region of interest. The predominant function of ball lenses is light collimation/coupling for optical fibers (e.g. laser to fiber coupling, fiber to fiber coupling), with other versatile possibilities to be incorporated in miniature optics (e.g. Barcode Scanning, Sensors, or as objective lenses, etc.). Ball Lenses could also be considered as pre-forms aspheric lenses. One advantage of a ball lens is its short  Back Focal Length (BFL), a trait that cuts down the distance from the optic to the fiber and is exceptionally useful when the installation space is rather tight, and compact dimension could simultaneously reduce the production cost. Additionally, a ball lens is rotationally symmetric, which enhances the ease of aligning and positioning.

Half-Ball Lenses are variants of ball lenses, obtained through simply cutting the ball lenses in half. Due to the ease of mounting brought by the one flat surface, half ball lenses are ideal for applications where more compact designs are required.

Hangzhou Shalom EO provides off-the-shelf Ball Lenses and Half Ball Lenses (diameter range 1-10mm) made from N-BK7, UV Fused Silica, and Sapphire, and custom Ball/Half-Ball Lenses (diameter range  0.3-100mm) of various substrate materials including Ruby, Ge, ZnSe, and other Optical Glass Materials of high refractive indices. Our Ball Lenses feature compact dimension capability which effectively liberates space limitation, and high precision/low spherical aberration. 


Material Selection Guidance:

N-BK7:  
N-BK7 is a high-quality borosilicate crown glass requisite for the fabrication of optics. It is one of the most prevalent optical glass, and with its transmission range from visible to near-IR low level of inclusions, and chemical/mechanical firmness, is an option whenever the extra benefits of UVFS (e.g. high transmission in the UV region) are not obligatory. It is worth noting that under normal conditions N-BK7 has relatively higher losses through higher absorption and scattering and therefore is more appropriate for applications of low/medium power levels. N-BK7 are designed to adapt to various processing, therefore N-BK7 ball/half-ball lenses are also ideal pre-forms of Aspheric Lenses.
Working Wavelength Range: 350nm to 2200nm 
Refractive Index: 1.51680 @ 587.5618 nm
Thermal Expansion: 7.1 x 10-6/K

UV Grade Fused Silica : 
UV Grade Fused Silica is amorphous state silicon dioxide made from fusing SiCl4 stones with high purity oxyhydrogen flame. The most outstanding attribute of UV Fused Silica is its high transmission rate in the ultraviolet region. The low coefficients of thermal expansion contribute to the high thermal stability. Additionally, the material also features high chemical resistance and minimal fluorescence.
Working Wavelength Range: 200nm to 2200nm 
Refractive Index: 1.458
Thermal Expansion: 0.57 x 10-6/?

Sapphire :
Optical grade Single Crystal Sapphire Ball Lenses and Half Ball Lenses, with unrivaled surface hardness, great heat resistance, and durability to chemical corrosions, are particularly suitable for operating environments that are subject to high heat. The broad transmission range of Sapphire from 0.15-5.5μm is also impressive. The large Refractive Index of Sapphire suggests decreased spherical aberration.
Working Wavelength Range: 170nm-5500nm
Refractive Index: 1.77
Compressive Strength (psi): 300,000
Thermal expansion: 5.6x10-6/K (parallel), 5.0x10-6/k (perpendicular)