Abstract
Optical waveguides are the basic blocks of integrated photonic circuits due to their ability to confine light on the μm-scale. In particular, beam splitting waveguides, e.g., Y-branch splitters, are interesting as power splitters, directional couplers and interferometers with potential applications in bio- and environmental sensing [1]. One of the most powerful fabrication methods of 3D photonic microstructures is fs Direct Laser Writing (DLW). It features fast fabrication time, simplicity and variety of structures and materials including low-symmetry crystals. We present here the fabrication of laser-active Y-splitters in Tm-doped monoclinic crystals by fs-DLW and their characterization.
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