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采用丘克劳斯基(Czochralski)法生长了Tm∶YAP晶体,研究了该晶体在室温下的吸收光谱和荧光光谱。结果表明,Tm∶YAP晶体在689.5 nm和795 nm左右有较强的吸收峰,分别对应于3H6→3F3和3H6→3H4的能级跃迁,半峰全宽(FWHM)分别为22.5 nm和30 nm,吸收截面分别为1.89×10-20cm2和1.35×10-20cm2。荧光光谱表明Tm∶YAP晶体发射波长为1.89μm,相应的荧光寿命为13.90 ms,发射截面为1.58×10-19cm2。根据乍得-奥菲特(Judd-Ofelt)理论计算了Tm3+在Tm∶YAP晶体中的强度参数:Ω2=1.4560×10-20cm2,Ω4=2.0673×10-20cm2,Ω6=0.3181×10-20cm2。结果表明,Tm∶YAP晶体具有宽的吸收峰、长荧光寿命和较大的积分发射截面的性质,非常适合于激光二极管(LD)抽运,有利于获得低阈值高效率的2μm波段激光输出。
Tm: YAP crystals were grown by the Czochralski method and the absorption and fluorescence spectra of the crystals at room temperature were studied. The results show that the Tm: YAP crystals have strong absorption peaks at 689.5 nm and 795 nm, which correspond to the energy transitions of 3H6 → 3F3 and 3H6 → 3H4, respectively, with full width at half maximum (FWHM) of 22.5 nm and 30 nm, respectively , The absorption cross sections were 1.89 × 10-20cm2 and 1.35 × 10-20cm2, respectively. Fluorescence spectra showed that the emission wavelength of Tm: YAP was 1.89μm, the corresponding fluorescence lifetime was 13.90 ms and the emission cross section was 1.58 × 10-19cm2. The intensity parameters of Tm3 + in Tm: YAP crystal were calculated according to the Judd-Ofelt theory: Ω2 = 1.4560 × 10-20cm2, Ω4 = 2.0673 × 10-20cm2, Ω6 = 0.3181 × 10-20cm2. The results show that the Tm:YAP crystal has wide absorption peak, long fluorescence lifetime and large integral emission cross section. It is very suitable for laser diode (LD) pumping, which is beneficial to obtain low threshold and high efficiency 2μm laser output.