加工了不同切向的Nd∶LiGd(MoO4)2晶体, 测量并分析了它们的连续和主动调制激光特性。实验采用激光二极管(LD)端面泵浦的两镜直腔, 其输出镜的耦合透过率为2%。在连续运转条件下, a切和c切晶体的最大输出功率分别为733, 550 mW, 对应的光光转换效率分别为11.3%和6.7%。在声光调Q脉冲运转条件下, a切和c切晶体的最大平均输出功率分别为180, 135 mW, 对应的光光转换效率分别为2.8%和1.7%。当重复频率为10 kHz时, 获得了最佳的脉冲实验结果, 即: 最大单脉冲能量和最高峰值功率来自a切晶体, 分别为15.8 J和85 W; 最小的脉冲宽度来自c切晶体, 为153 ns。实验结果还显示, 不同切向的Nd∶LiGd(MoO4)2晶体具有不同的输出波长, a切晶体为1 061 nm, c切晶体为1 068 nm, 这种多波长发射特性有助于该类晶体在THz波领域的应用。

The Nd∶LiGd(MoO4)2 crystal samples with different orientations were machined, and their Continuous Wave (CW) and actively modulation laser characteristics were measured and analyzed. A laser diode (LD) end-pumped double mirror cavity was used in the experiment, in which the coupling transmittance of the output mirror was 2%. In CW operation conditions, the maximum output powers of a-cut and c-cut crystals were 733 mW and 550 mW, respectively, corresponding optical conversion efficiencies of 11.3% and 6.7%. In acousto-optic (A-O) operation conditions, the maximum output powers of a-cut and c-cut crystals were 180 mW and 135mW, respectively, corresponding optical conversion efficiencies of 2.8% and 1.7%. The optimum pulse experimental results are obtained when the pulse repetition frequency (PRF) is 10 kHz. It is shown that the largest pulse energy and the highest peak power are 15.8 J and 85 W, respectively, which come from the a-cut sample. The shortest pulse width is 153 ns, which comes from the c-cut sample. Experimental results indicate that Nd∶LiGd(MoO4)2 crystals with different orientations can output different wavelengths in 1061 nm for the a-cut sample and in 1 068 nm for c-cut sample. The multi-wavelength emission property of the Nd∶LiGd(MoO4)2 crystal will help its applications to the THz-wave domain.