Abstract
A fabrication method of hollow channels in YAG:Nd with walls facetted parallel to crystallographic planes is proposed and investigated. The method is based on the direct laser writing of the helical tracks along one of the main crystallographic axes and the following wet facetted etching. Inscription of the track along [111] axis allows to form a hexagonal hollow channel after subsequent wet etching. The channel walls coincide with {110} crystallographic planes. The propagation loss of the fundamental mode at 1550 nm is measured to be less than 0.5 dB/cm.
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