Abstract
A composite crystal consisting of a 0.4-mm-thick (1.1 at.%)Er:(25 at.%)Yb:YAl3(BO3)4 crystal and a pure 1.0-mm-thick YAl3(BO3)4 crystal was successfully fabricated by the thermal diffusion bonding method. When the pure YAl3(BO3)4 crystal was used as an effective heat sink, thermal effects in the Er:Yb:YAl3(BO3)4/YAl3(BO3)4 composite crystal can be reduced, and the maximum output power of 1.55 μm laser was increased from 350 mW in a lone 0.4-mm-thick Er:Yb:YAl3(BO3)4 crystal to 780 mW in the composite crystal under identical experimental conditions. The results show that using such a diffusion-bonded Er:Yb:YAl3(BO3)4/YAl3(BO3)4 composite crystal as a gain medium can effectively enhance the performance of a 1.55 μm laser.
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