Taper array in silica glass for beam splitting

Abstract

We proposed taper array in silica glass for beam splitting which was fabricated by water-assisted femtosecond laser direct writing technology and the subsequent heat treatment.We divided the array into many fabricating cells which were executed automatically in sequences as specified by the program that contained the information for the three-dimensional stage movements. Each cell could fabricated a rectangular cylinder. The size and distribution of the rectangular cylinder could be controlled by adjusting the position of the fabricating cells. Then the heat treatment should be used to reshape the rectangular cylinders into taper array. The experimental results show that the taper periodic microstructures in silica glass are uniform and smooth, and the tapers can divide the incident light into beam array. The results demonstrated that the combination of the water-assisted femtosecond laser direct writing technology and the heat treatment is accessible and practical for the high quality micro-optical elements. These micro-optical elements will have potential applications in fluorescence detection and beam splitter.

Fabrication of polymer compound microlens by lens-on-lens microstructures

“…Microlenses with special structures have played more important roles than simple lenses in many applications, such as achieving illumination uniformity by Fresnel microlens [1], improving coupling efficiency of high-power laser diodes and single-mode fiber by an elliptic cone-shaped microlens [2], achieving two focal plane by polydimethylsiloxane (PDMS) lens-on-lens microstructure [3].Due to the low cost and easy formability, polymers are widely used to fabricate microlens [4,5]. Many researchers unceasingly explores in this domain, the methods for fabricating the microlens are gradually matured, such as photo-resist reflow method [6,7], gray-scale photolithography [8], micro-inkjet fabrication [9,10], and femtosecond laser direct writing [3,11,12].Moreover, the laser direct writing technology canalso be used to fabricate convex microlenses, but there are some problems in surface quality, profile and fabricating efficiency, which should be improved [13,14]. We have also noticed that the approaches mentioned above are multistep © 2016.…”