CH₃NH₃PbI₃ Perovskite Nanorods Saturable Absorber for Stable Ultra-Fast Laser

Abstract

In this paper, we propose a novel ultrafast laser with nanostructure CH3NH3PbI3 nanorods, yielding a higher modulation depth and lower optical loss. Our experiment is performed through nanopatterned CH3NH3PbI3 rods and an allsolid-state passive mode-locked laser system. The prepared nanoarray CH3NH3PbI3 perovskite exhibits a modulation depth of 8.1% under a saturation intensity of 9.53 MW/cm 2 . By applying the CH3NH3PbI3 nanoarray as a saturable absorber in the ultrafast 1064-nm laser system, a mode-locked pulse with a 30-ps pulse width and an 87.3-MHz repetition rate is achieved. A maximum output power of 542 mW was measured, under an absorption pump power of 5.4 W. With the new structured CH3NH3PbI3, our experiment verifies a new method in ultrafast lasers with low light loss, which potentially uncovers an avenue to develop ultrafast lasers.