Various microlenses are fabricated on the end of single-mode fibers using a photolithographic technique. The radii of these lenses are in the 2.6–20-μm range. The beam waist and beam waist position of these lenses are measured and compared to theoretical values derived for Gaussian beams under a paraxial ray approximation. Beam spot sizes of <0.75 μm have been achieved at 830 nm.
© 1985 Optical Society of America
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