Micro-hyperboloid lensed fibers for efficient coupling from laser chips

Abstract

A novel technique is presented for producing micro-hyperboloid lensed fibers for efficient coupling to semiconductor laser chips. A three-step process including a precision mechanical grinding, a spin-on-glass (SOG) coating and an electrostatic pulling process is used to form the hyperboloid lens structure on a flat-end single mold fiber (SMF) with the core diameter of 6.6 μm. Micro-hyperboloid lensed fibers with tunable radii of curvature around 4.18 - 4.83 μm can be formed on the SMF end face. A high average coupling efficiency around 80% and low coupling variation of 0.116 ± 0.044% are obtained for the produced fibers. The developed method is efficient to produce micro-hyperboloid lensed fibers for high-performance light coupling between the SMF and the semiconductor diode lasers.

Elliptical Microlens Fabrication by Spatially Shaped Femtosecond Laser-assisted Chemical Etching

“…Different applications had different requirements on the morphology of the elliptical microlens, so it is particularly important to control the morphology of the elliptical microlens. There are many methods used in elliptical microlens fabrication, such as mechanical fabrication [6,7], ink-jet printing [8], nanoimprinting [9,10], reflow technique [11][12][13], etc. Mechanical fabrication was low efficiency and difficult to fabricate hard and brittle materials.…”