Ball Microlenses
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Ball lenses have a long tradition of manufacture and use.
The ball lens Effective Focal Length (EFL) and Working Distance (WD) at the selected wavelength depend on the glass refractive index n and the ball diameter D as:
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Ball Diameter Tolerance +/- 0.005 mm
Ball Roundness Deviation < 0.003 mm Drum Diameter Tolerance +0.00 / -0.02 mm Square Dimension Tolerance +0.00 / -0.02 mm AR Coating R < 0.5%, AOI 0-30°