利用初始透过率为89.5%的Co∶MgAl₂O₄ 晶体作为1.3 μm波段的可饱和吸收体,采用双镜谐振腔,实现了1319 nm Nd∶YAG激光器的高效率、低阈值被动调Q运转。当抽运功率为10.0 W时,获得平均输出功率为490 mW,最窄脉冲宽度为18.3 ns,重复频率为17.5 kHz,对应单脉冲能量为28.1 μJ,峰值功率高达1533 W的脉冲激光。结果表明,Co∶MgAl₂O₄晶体在1.3 μm处具有良好的可饱和吸收特性。

A Co∶MgAl2O4 crystal with an initial transmissivity of 89.5% is used as a saturable absorber at a wavelength of 1.3 μm. A low-threshold and high-efficiency passively Q-switched 1319 nm Nd∶YAG laser output is achieved with two-mirror resonator. When the pump power is 10.0 W, a pulsed laser with an average output power of 490 mW, the narrowest pulse width of 18.3 ns, a repetition rate of 17.5 kHz, a pulse energy of 28.1 μJ and a peak power of 1533 W is obtained. The results show that the Co∶MgAl2O4 crytal possesses a good saturable absorption property at a wavelength of 1.3 μm.