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Location: Main > Optical Lenses > Ball Lens Half Ball Lens > POL-BK7-BA-U-3.0
Name: DIA3.0mm BK7 Ball Lens(40-20 S/D) Uncoated
P/N: POL-BK7-BA-U-3.0
Keywords:Dia3.0mm,BK7,40-20 S/D,Uncoated
Unit Price: S$45.00/pc
Available: In stock
Request: Add to Request List
Introduction:
Ball lenses are highly polished spheres made of optically transparent homogeneous materials. Carefully controlled manufacturing process produces spheres with precise diameters and unsurpassed surface quality. Ball lenses are great tools for improving signal coupling between fibers, emitters and detectors.
Spherical ball lenses are widely used in optical measurement systems, projection & imaging optical systems. Also for laser collimating and focusing, laser-to-fiber coupling, fiber-to-fiber coupling, and fiber-to-detector coupling.

 Material:  BK7 optical glass
 Wavelength Range:  350 - 2000nm
 Diameter:  3.00,+/-0.05mm
 Sphericity:  +/-1um
 Surface Quality:  40/20 scratch and dig
 Coating:  Uncoated


The effective focal length of a ball lens is very simple to calculate since there are only two variables: the ball lens diameter, D, and the index of refraction, n. The effective focal length is measured from the center of the lens. Therefore, the back focal length can also be easily calculated.
BFL = F - [D/2]      EFL = nD/[4(n - 1)]

The Numerical Aperture, NA, of a ball lens is dependent on the focal length of the ball and on the input diameter, d. Since spherical aberration is inherent in ball lenses the following equation begins to fall off as d/D increases.
NA = [2d(n - 1)]/nD

When coupling light from a laser into a fiber, the choice of the ball is dependent on the NA of the fiber and the diameter of the laser beam. The diameter of the laser beam is used to determine the NA of the ball lens. The NA of the ball lens must be less than or equal to the NA of the fiber in order to couple all of the light into the fiber. The ball lens is placed directly onto the fiber.

To couple light from one fiber to another fiber of similar NA, two identical ball lenses are used. Place the two lenses in contact with the fibers.