Add time:08/30/2019         Source:sciencedirect.com

A stoichiometric Sr3Tb2(BO3)4 crystal was successfully grown by the Czochralski method. Polarized absorption and fluorescence spectra of the crystal were measured at room temperature. The peak absorption cross-section at 486 nm corresponding to the 7F6→5D4 transition of Tb3+ ions for the E//Z polarization is 1.32 × 10–22 cm2. Based on the Judd-Ofelt theory, fluorescence branching ratios of the 5D4→7F5 and 5D4→7F4 transitions of Tb3+ ions were calculated to be 64.86% and 7.69%, respectively. The radiative lifetime of the 5D4 multiplet was calculated to be 2.93 ms. The yellow fluorescence band centered at 586 nm corresponding to the 5D4→7F4 transition is flat and the full width at half the maximum of this band is 8.5 nm. The fluorescence lifetime of the 5D4 multiplet was measured to be 2 ms and the fluorescence quantum efficiency was estimated to be 69%. Above results show that the Sr3Tb2(BO3)4 crystal is a potential gain medium for yellow laser.

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