We propose a novel fabrication method, which is referred to as the sample-inverted reflow technique, to fabricate a refractive microlens array (MLA) with a revolved-hyperboloid profile in a solgel material. The fabricated solgel MLA demonstrates an excellent smooth profile with a fabrication error much less than the difference between the revolved hyperboloid and the spherical surface. In an application of coupling a laser diode (LD) to a single-mode fiber (SMF), we propose a two-MLA coupling scheme in which two revolved-hyperboloid MLAs are used between the LD and the SMF. In this configuration the coupling efficiency achieves 81.7% (-0.88 dB) .
© 2004 Optical Society of America
Miao He, Xiaocong Yuan, and Jing Bu, "Sample-inverted reflow technique for fabrication of a revolved-hyperboloid microlens array in hybrid solgel glass," Opt. Lett. 29, 2004-2006 (2004)