报道了一种以二维材料MoS₂作为可饱和吸收体的全固态Tm∶YAG被动调Q激光器。该激光器以785 nm窄线宽半导体激光器作为抽运源,采用平平腔设计,以MoS₂纳米片作为可饱和吸收体,实现了2 μm 波段的被动调Q运转。在吸收抽运功率达到2.02 W时,获得了最大平均输出功率为421 mW、最小脉冲宽度为 423 ns、重复频率为49.36 kHz、最大单脉冲能量为8.53 μJ的脉冲激光输出。结果表明,MoS₂ 是一种可适用于2 μm 波段固态激光器的可饱和吸收体,为产生近红外波段的脉冲激光提供了一种新的方法。

A passively Q-switched solid-state Tm∶YAG laser with MoS2 as saturable absorber is reported. In this laser, a 785 nm narrow linewidth diode laser is taken as pump source, a plano-plano cavity is used, and MoS2 nanosheets are served as saturable absorber. Passive Q-switching can be achieved successfully in 2 μm wavelength region. When the absorbed pump power is at 2.02 W, the Q-switched laser pulses are obtained with the maximum average output power of 421 mW, the minimum pulse width of 423 ns, the pulse repetition rate of 49.36 kHz and the maximum pulse energy of 8.53 μJ. The results indicate that MoS2 is a kind of saturable absorber that can be used in solid-state laser in 2 μm wavelength region. Furthermore, it provides a potential way to obtain 2 μm pulse laser.