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BK7, Borosilicate, Fused Silica, Sapphire, CaF2, ZnSe, Ruby
40/20, 20/10, 10/5
|Radius of curvature|
3 arc min
|Ceter thickness tolerance|
Glass ball lenses are widely used for coupling fiber and semiconductor lasers, or photodetectors. It’s much smaller than a normal lens, and it’s completely polished, so be careful when using it. But it can reduce the size and weight of the device. With a positive focal length, used at the unit conjugate point, can eliminate all kinds of aberration.
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