1.34~\mu m Q-Switched Nd:YVO4 Laser Based on Perovskite Film Saturable Absorber

Hybrid organic-inorganic methylammonium lead halide (CH 3 NH 3 PbI 3 ) perovskite with a direct band gap has emerged as a material in the development of optoelectronic devices. Here, for the first time, at 1.34~\mu \text{m} , we fabricated CH 3 NH 3 PbI 3 perovskite film saturable absorbers by spin coating methods for passively Q-switched Nd:YVO 4 laser. The CH 3 NH 3 PbI 3 -SA shows a damage threshold of 276.6 mJ/cm 2 , a modulation depth of 18.2%, and a considerably low saturation intensity of 140.7 KW/cm 2 . By using CH 3 NH 3 PbI 3 -SA, a stable Q-switched laser with a maximum average output power of 182 mW and a pulse width of 181.6 ns can be obtained. These results reveal the promising application of CH 3 NH 3 PbI 3 in 1.34 \mu \text{m} -lasers, optical switches or optical modulators.