Abstract
Neodymium-doped Y0.8La0.2VO4 and Gd0.8La0.2VO4 single-crystal fibres weresuccessfully grown by the laser-heated pedestal growth (LHPG) technique. Thefibres were completely transparent and no dark inclusions were observed byoptical microscopy. In the characterization process, microprobe Raman, opticalabsorption, fluorescence, lifetime, and gain-excited state absorption spectra wereinvestigated in addition to upconversion measurements. The fibres’ structural andspectroscopic properties are very similar to those of YVO4 and GdVO4 bulk lasercrystals, with the advantageous characteristic of broadened spectral linewidthsthat facilitate the pumping of the 1064 nm emission by a diode laser. Thesefairly new crystal compositions, that can be grown in fast and economicalprocesses, are potential candidates for use as compact laser-active media.
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