PbS quantum dots as a saturable absorber for ultrafast laser

• DOI: 10.1364/prj.6.001028
• Publication Date: 2018-10-16T16:21:51Z
• Authors: Ling Yun; Yang Qiu; Conghao Yang; Jie Xing; Kehan Yu; Xiangxing Xu; Wei Wei
• Keywords: Saturable absorption; Nanomaterials; Mode-Locking; Bohr radius

Low-dimensional nanomaterials, owing to their unique and versatile properties, are very attractive for enormous electronic optoelectronic applications. PbS quantum dots (QDs), characterized by a large Bohr radius size-tunable bandgap, especially interesting photonic applications in the near-infrared region. Here, oleic acid capped colloidal QDs as saturable absorber investigated ultrashort-pulse generation. The exhibit outstanding nonlinear absorption properties at 1550 nm: modulation depth up 44.5% thermal damage threshold larger than 30 mJ/cm2. By incorporating into fiber laser, transform-limited soliton pulse short 559 fs with bandwidth of 4.78 nm is realized 1563 nm. Numerous may benefit from QDs, such pulsed lasers modulators.