[Formula Omitted]m Q-Switched Nd:YVO4 Laser Based on Perovskite Film Saturable Absorber

Hybrid organic-inorganic methylammonium lead halide (CH3NH3PbI3) perovskite with a direct band gap has emerged as a material in the development of optoelectronic devices. Here, for the first time, at [Formula Omitted], we fabricated CH3NH3PbI3 perovskite film saturable absorbers by spin coating methods for passively Q-switched Nd:YVO4 laser. The CH3NH3PbI3-SA shows a damage threshold of 276.6 mJ/cm2, a modulation depth of 18.2%, and a considerably low saturation intensity of 140.7 KW/cm2. By using CH3NH3PbI3-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 CH3NH3PbI3 in 1.34 [Formula Omitted]-lasers, optical switches or optical modulators.