Abstract
Lu2.4Y0.6Al5O12 (LuYAG) crystals with three different doping concentrations of Tm3+ and Ho3+ were grown successfully by the Czochralski method. The crystals exhibit broad absorption band at 783nm and the full width at half maximum (FWHM) are about 11nm. Excited by 783nm laser diode (LD), strong fluorescence peaks are observed near 2.9μm, suggesting that the Tm3+ ions can act as the sensitizer for Ho3+ ions. The stimulated emission cross-sections at 2.911μm are calculated to be 5.49×10−18cm2, 3.11×10−18cm2, and 4.04×10−18cm2, respectively. Compared with the Tm,Ho:LuAG, and Tm,Ho:YAG crystals, the Tm,Ho:LuYAG crystal with 3at.% Tm3+ and 1at.% Ho3+ has a relatively longer lifetime 0.138ms for the upper level 5I6 and a shorter lifetime 7.25ms for the lower level 5I7, which is advantageous to the population inversion. These results indicate that the Tm,Ho:LuYAG crystal with 3at.% Tm3+ and 1at.% Ho3+ is a new potential candidate for realizing the 2.911μm laser output.
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