CH3NH3PbI3 Perovskite Nanorods Saturable Absorber for Stable Ultra-Fast Laser

In this paper, we propose a novel ultrafast laser with nanostructure CH
₃
NH
₃
PbI
₃
nanorods, yielding a higher modulation depth and lower optical loss. Our experiment is performed through nanopatterned CH
₃
NH
₃
PbI
₃
rods and an all-solid-state passive mode-locked laser system. The prepared nanoarray CH
₃
NH
₃
PbI
₃
perovskite exhibits a modulation depth of 8.1% under a saturation intensity of 9.53 MW/cm
²
. By applying the CH
₃
NH
₃
PbI
₃
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 CH
₃
NH
₃
PbI
₃
, our experiment verifies a new method in ultrafast lasers with low light loss, which potentially uncovers an avenue to develop ultrafast lasers.