Abstract
In this paper, a passively Q-switched Tm:YAP laser with two-dimensional (2D) tin diselenide (SnSe2) nanosheet prepared by chemical vapor deposition (CVD) method as SA was demonstrated for the first time. The microstructure and optical characteristics of SnSe2 nanosheet were investigated to characterize it. Continuous-wave (CW) Tm:YAP laser was demonstrated firstly. The 6.9 W absorbed pump power was used to generate 2.36 W maximum output power with corresponding slop efficiency of 45.9%. The beam profiles and quality factor were measured, respectively. By inserting the SnSe2 into the plano-concave resonant, a Q-switched Tm:YAP laser operation at 2 µm was realized. The Q-switched laser had a maximum average output power of 411 mW, a shortest pulse duration of 2.4 µs, a maximum pulse repetition frequency of 43.2 kHz, a maximum pulse energy of 9.51 μJ and a highest peak power of 3.96 W.
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