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采用提拉法生长了Yb掺杂原子数分数为0.5%的Yb∶Y3Al5O12(Yb∶YAG)晶体,对晶体的吸收光谱和荧光光谱进行了分析。与Yb掺杂原子数分数为5%的Yb∶YAG晶体进行了对比,得出采用940 nm激光二极管(LD)抽运晶体最为合适。原子数分数为0.5%的Yb∶YAG晶体相对于原子数分数为5%的Yb∶YAG晶体自吸收效应的影响要小。测量了原子数分数为0.5%的Yb∶YAG晶体的荧光寿命为0.95 ms,与理论值很接近。因此采用原子数分数为0.5%的Yb∶YAG晶体作为激光工作物质将有利于高效、小型集成化的固体激光器的发展。
The Yb: Y3Al5O12 (Yb: YAG) crystal with Yb doping 0.5% atomic fraction was grown by Czochralski method. The absorption and fluorescence spectra of the crystal were analyzed. Compared with 5% Yb doped Yb: YAG crystals, it is concluded that a 940 nm laser diode (LD) is the most suitable method for pumping crystals. The Yb: YAG crystal with 0.5% atomic fraction has a smaller influence on the self-absorption of Yb: YAG crystal with 5% atomic fraction. The measured fluorescence lifetime of Yb: YAG crystal with 0.5% atomic fraction was 0.95 ms, which is close to the theoretical value. Therefore, the use of Yb: YAG crystal with 0.5% atomic number as laser working material will benefit the development of high efficiency, compact and integrated solid-state lasers.