Authors: Z Zhu J Li B Alain G Jia Z You X Lu B Wu C Tu
Publish Date: 2006/07/11
Volume: 86, Issue: 1, Pages: 71-75
Abstract
Yb3+GdAl3BO34 hereafter Yb3+GAB crystals with large sizes and good optical quality have been grown by the topseed solution growth TSSG method The polarized absorption and emission spectra have been investigated at room temperature For the σpolarization the intensities of both absorption and emission spectra are stronger than those for the πpolarization the σabsorption cross section of Yb3+ in GAB being 343×1020 cm2 at 977 nm and the σemission cross section being 098×1020 cm2 at 1045 nm The fluorescence lifetime of the 2 F 5/2→2 F 7/2 transition was measured to be 800 μs in the 5 doped sample used for our laser experiments 993 μs in a 10 doped sample and 569 μs in a 05 doped sample The laser parameters were estimated as βmin=0022 Isat=104 kW/cm2 and Imin=023 kW/cm2 About 04 W laseroutput at the wavelength of 1043 nm was achieved when the Yb3+GAB crystal was pumped by a 974 nm laser diode with 274 slope efficiency
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