介绍了一台2 μm波段的被动调Q（PQS）模式Tm∶YAP激光器。该激光器采取直形腔结构，用输出中心波长为792 nm的激光二极管作为泵浦光源，用新型二维材料黑磷制备的可饱和吸收体作为PQS调制器件。实验结果表明：在连续波模式运转下，当泵浦功率为8.8 W时，Tm∶YAP激光器的输出功率为1.0 W，输出中心波长为1994.8 nm，相应的斜率效率为17.3%；在PQS模式运转下，当泵浦功率为8.8 W时，Tm∶YAP激光器的平均输出功率为0.9 W，输出脉冲宽度为1.3 µs，重复频率为135.8 kHz；当平均输出功率为0.9 W时，Tm∶YAP激光器的输出中心波长为1986.7 nm，相应的斜率效率为14.2%，光束质量因子Mx2=1.10、My2=1.06。

A passively Q-switched (PQS) Tm∶YAP laser in the 2 μm waveband is introduced. A linear cavity structure of the Tm∶YAP laser is chosen in the experiment. A laser diode with an output central wavelength of 792 nm is used as the pump source, and a saturable absorber prepared by a new two-dimensional material of black phosphorus is used as a PQS modulation device for the Tm∶YAP laser. In the continuous wave mode, an output power of 1.0 W is obtained with an output central wavelength of 1994.8 nm from the Tm∶YAP laser under the pump power of 8.8 W, corresponding to a slope efficiency of 17.3%. Under the PQS regime, an average output power of 0.9 W and a minimum pulse width of 1.3 µs at 135.8 kHz are acquired from the Tm∶YAP laser at 1986.7 nm under the pump power of 8.8 W, corresponding to a slope efficiency of 14.2%. In addition, the beam quality factor of Mx2=1.10 and My2=1.06 are measured from the PQS Tm∶YAP laser under an average output power of 0.9 W.