Abstract
Tm3+-doped CaYAlO4 (Tm:CALYO) shaped crystals fibers with various doping concentration of 2 at.%, 3 at.%, 5 at.% and 7 at.% have been successfully grown by the micro-pulling-down (μ-PD) method. The polarized absorption spectra, polarized fluorescence spectra and fluorescence decay curves were analyzed at room temperature. The absorption bands of 3H6→3H4 transition centered at around 800 nm match well with commercial AlGaAs laser diode pumping sources. For 7 at.% Tm:CALYO crystal fiber, the full width at half maximum (FWHM) of the emission band for π polarization at 1806 nm was 225.4 nm. The fluorescence of 3F4 level decreased strongly as the thulium concentration increased. All the results indicate that Tm:CALYO crystal fibers are promising for ultrashort and tunable laser operation.
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